From e7128e8dbb305059c30ec085461297e619bcbff4 Mon Sep 17 00:00:00 2001
From: Peter Eisentraut <peter_e@gmx.net>
Date: Fri, 18 Apr 2014 00:03:19 -0400
Subject: [PATCH] Create function prototype as part of PG_FUNCTION_INFO_V1
 macro

Because of gcc -Wmissing-prototypes, all functions in dynamically
loadable modules must have a separate prototype declaration.  This is
meant to detect global functions that are not declared in header files,
but in cases where the function is called via dfmgr, this is redundant.
Besides filling up space with boilerplate, this is a frequent source of
compiler warnings in extension modules.

We can fix that by creating the function prototype as part of the
PG_FUNCTION_INFO_V1 macro, which such modules have to use anyway.  That
makes the code of modules cleaner, because there is one less place where
the entry points have to be listed, and creates an additional check that
functions have the right prototype.

Remove now redundant prototypes from contrib and other modules.
---
 contrib/adminpack/adminpack.c                 |  5 ---
 contrib/btree_gin/btree_gin.c                 |  5 ---
 contrib/btree_gist/btree_bit.c                |  8 ----
 contrib/btree_gist/btree_bytea.c              |  7 ----
 contrib/btree_gist/btree_cash.c               |  9 -----
 contrib/btree_gist/btree_date.c               |  9 -----
 contrib/btree_gist/btree_float4.c             |  9 -----
 contrib/btree_gist/btree_float8.c             |  9 -----
 contrib/btree_gist/btree_gist.c               |  2 -
 contrib/btree_gist/btree_inet.c               |  7 ----
 contrib/btree_gist/btree_int2.c               |  9 -----
 contrib/btree_gist/btree_int4.c               |  9 -----
 contrib/btree_gist/btree_int8.c               |  9 -----
 contrib/btree_gist/btree_interval.c           | 10 -----
 contrib/btree_gist/btree_macaddr.c            |  7 ----
 contrib/btree_gist/btree_numeric.c            |  7 ----
 contrib/btree_gist/btree_oid.c                |  9 -----
 contrib/btree_gist/btree_text.c               |  9 -----
 contrib/btree_gist/btree_time.c               | 11 -----
 contrib/btree_gist/btree_ts.c                 | 13 ------
 contrib/btree_gist/btree_utils_var.c          |  1 -
 contrib/chkpass/chkpass.c                     | 12 ------
 contrib/citext/citext.c                       | 10 -----
 contrib/cube/cube.c                           | 40 -------------------
 contrib/dict_int/dict_int.c                   |  3 --
 contrib/dict_xsyn/dict_xsyn.c                 |  3 --
 contrib/earthdistance/earthdistance.c         |  2 -
 contrib/file_fdw/file_fdw.c                   |  3 --
 contrib/fuzzystrmatch/dmetaphone.c            |  3 --
 contrib/fuzzystrmatch/fuzzystrmatch.c         | 12 ------
 contrib/hstore/hstore.h                       |  1 -
 contrib/hstore/hstore_compat.c                |  1 -
 contrib/hstore/hstore_gin.c                   |  3 --
 contrib/hstore/hstore_gist.c                  | 11 -----
 contrib/hstore/hstore_io.c                    | 13 ------
 contrib/hstore/hstore_op.c                    | 28 -------------
 contrib/intarray/_int_bool.c                  |  8 ----
 contrib/intarray/_int_gin.c                   |  2 -
 contrib/intarray/_int_gist.c                  |  8 ----
 contrib/intarray/_int_op.c                    | 21 ----------
 contrib/intarray/_intbig_gist.c               | 12 ------
 contrib/lo/lo.c                               |  4 --
 contrib/ltree/_ltree_gist.c                   | 11 -----
 contrib/ltree/_ltree_op.c                     |  8 ----
 contrib/ltree/ltree_gist.c                    | 16 --------
 contrib/ltree/ltree_io.c                      |  7 ----
 contrib/ltree/ltree_op.c                      | 19 ---------
 contrib/ltree/ltxtquery_io.c                  |  3 --
 contrib/pageinspect/btreefuncs.c              |  4 --
 contrib/pageinspect/fsmfuncs.c                |  2 -
 contrib/pageinspect/heapfuncs.c               |  2 -
 contrib/pageinspect/rawpage.c                 |  4 --
 contrib/pg_buffercache/pg_buffercache_pages.c |  2 -
 contrib/pg_freespacemap/pg_freespacemap.c     |  2 -
 contrib/pg_prewarm/pg_prewarm.c               |  2 -
 .../pg_stat_statements/pg_stat_statements.c   |  4 --
 contrib/pg_trgm/trgm_gin.c                    |  7 ----
 contrib/pg_trgm/trgm_gist.c                   | 19 ---------
 contrib/pg_trgm/trgm_op.c                     | 11 -----
 .../pg_upgrade_support/pg_upgrade_support.c   | 13 ------
 contrib/pgcrypto/pgp-pgsql.c                  | 17 --------
 contrib/pgrowlocks/pgrowlocks.c               |  2 -
 contrib/pgstattuple/pgstatindex.c             |  6 ---
 contrib/pgstattuple/pgstattuple.c             |  3 --
 contrib/postgres_fdw/option.c                 |  2 -
 contrib/postgres_fdw/postgres_fdw.c           |  2 -
 contrib/seg/seg.c                             |  7 ----
 contrib/spi/autoinc.c                         |  2 -
 contrib/spi/insert_username.c                 |  2 -
 contrib/spi/moddatetime.c                     |  2 -
 contrib/spi/refint.c                          |  4 --
 contrib/spi/timetravel.c                      |  3 --
 contrib/sslinfo/sslinfo.c                     | 10 -----
 contrib/tcn/tcn.c                             |  4 --
 contrib/test_parser/test_parser.c             | 20 +++-------
 contrib/test_shm_mq/test.c                    |  2 -
 contrib/tsearch2/tsearch2.c                   | 23 +----------
 contrib/unaccent/unaccent.c                   |  3 --
 contrib/uuid-ossp/uuid-ossp.c                 | 13 ------
 contrib/worker_spi/worker_spi.c               |  1 -
 contrib/xml2/xpath.c                          | 11 -----
 contrib/xml2/xslt_proc.c                      |  4 --
 src/include/fmgr.h                            |  1 +
 src/pl/plperl/plperl.c                        |  6 ---
 src/pl/plpgsql/src/plpgsql.h                  |  3 --
 src/pl/plpython/plpy_main.c                   | 11 +----
 src/pl/tcl/pltcl.c                            |  2 -
 src/test/regress/regress.c                    | 13 ------
 88 files changed, 9 insertions(+), 670 deletions(-)

diff --git a/contrib/adminpack/adminpack.c b/contrib/adminpack/adminpack.c
index 27cbcde073..8193b1f1d0 100644
--- a/contrib/adminpack/adminpack.c
+++ b/contrib/adminpack/adminpack.c
@@ -40,11 +40,6 @@
 
 PG_MODULE_MAGIC;
 
-Datum		pg_file_write(PG_FUNCTION_ARGS);
-Datum		pg_file_rename(PG_FUNCTION_ARGS);
-Datum		pg_file_unlink(PG_FUNCTION_ARGS);
-Datum		pg_logdir_ls(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(pg_file_write);
 PG_FUNCTION_INFO_V1(pg_file_rename);
 PG_FUNCTION_INFO_V1(pg_file_unlink);
diff --git a/contrib/btree_gin/btree_gin.c b/contrib/btree_gin/btree_gin.c
index 5e6003f63c..87d23e0350 100644
--- a/contrib/btree_gin/btree_gin.c
+++ b/contrib/btree_gin/btree_gin.c
@@ -32,7 +32,6 @@ typedef struct QueryInfo
 
 #define  GIN_EXTRACT_VALUE(type)											\
 PG_FUNCTION_INFO_V1(gin_extract_value_##type);								\
-Datum		gin_extract_value_##type(PG_FUNCTION_ARGS);						\
 Datum																		\
 gin_extract_value_##type(PG_FUNCTION_ARGS)									\
 {																			\
@@ -59,7 +58,6 @@ gin_extract_value_##type(PG_FUNCTION_ARGS)									\
 
 #define GIN_EXTRACT_QUERY(type)												\
 PG_FUNCTION_INFO_V1(gin_extract_query_##type);								\
-Datum		gin_extract_query_##type(PG_FUNCTION_ARGS);						\
 Datum																		\
 gin_extract_query_##type(PG_FUNCTION_ARGS)									\
 {																			\
@@ -109,7 +107,6 @@ gin_extract_query_##type(PG_FUNCTION_ARGS)									\
  */
 #define GIN_COMPARE_PREFIX(type)											\
 PG_FUNCTION_INFO_V1(gin_compare_prefix_##type);								\
-Datum		gin_compare_prefix_##type(PG_FUNCTION_ARGS);					\
 Datum																		\
 gin_compare_prefix_##type(PG_FUNCTION_ARGS)									\
 {																			\
@@ -182,7 +179,6 @@ gin_compare_prefix_##type(PG_FUNCTION_ARGS)									\
 
 
 PG_FUNCTION_INFO_V1(gin_btree_consistent);
-Datum		gin_btree_consistent(PG_FUNCTION_ARGS);
 Datum
 gin_btree_consistent(PG_FUNCTION_ARGS)
 {
@@ -404,7 +400,6 @@ GIN_SUPPORT(varbit)
 #define NUMERIC_IS_LEFTMOST(x)	((x) == NULL)
 
 PG_FUNCTION_INFO_V1(gin_numeric_cmp);
-Datum		gin_numeric_cmp(PG_FUNCTION_ARGS);
 
 Datum
 gin_numeric_cmp(PG_FUNCTION_ARGS)
diff --git a/contrib/btree_gist/btree_bit.c b/contrib/btree_gist/btree_bit.c
index d94abcb3cf..edf75e0684 100644
--- a/contrib/btree_gist/btree_bit.c
+++ b/contrib/btree_gist/btree_bit.c
@@ -19,14 +19,6 @@ PG_FUNCTION_INFO_V1(gbt_bit_consistent);
 PG_FUNCTION_INFO_V1(gbt_bit_penalty);
 PG_FUNCTION_INFO_V1(gbt_bit_same);
 
-Datum		gbt_bit_compress(PG_FUNCTION_ARGS);
-Datum		gbt_bit_union(PG_FUNCTION_ARGS);
-Datum		gbt_bit_picksplit(PG_FUNCTION_ARGS);
-Datum		gbt_bit_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_bit_penalty(PG_FUNCTION_ARGS);
-Datum		gbt_bit_same(PG_FUNCTION_ARGS);
-
-
 
 /* define for comparison */
 
diff --git a/contrib/btree_gist/btree_bytea.c b/contrib/btree_gist/btree_bytea.c
index 0dd441964a..dfc25a45c6 100644
--- a/contrib/btree_gist/btree_bytea.c
+++ b/contrib/btree_gist/btree_bytea.c
@@ -18,13 +18,6 @@ PG_FUNCTION_INFO_V1(gbt_bytea_consistent);
 PG_FUNCTION_INFO_V1(gbt_bytea_penalty);
 PG_FUNCTION_INFO_V1(gbt_bytea_same);
 
-Datum		gbt_bytea_compress(PG_FUNCTION_ARGS);
-Datum		gbt_bytea_union(PG_FUNCTION_ARGS);
-Datum		gbt_bytea_picksplit(PG_FUNCTION_ARGS);
-Datum		gbt_bytea_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_bytea_penalty(PG_FUNCTION_ARGS);
-Datum		gbt_bytea_same(PG_FUNCTION_ARGS);
-
 
 /* define for comparison */
 
diff --git a/contrib/btree_gist/btree_cash.c b/contrib/btree_gist/btree_cash.c
index 8e8495ca06..8de3716c94 100644
--- a/contrib/btree_gist/btree_cash.c
+++ b/contrib/btree_gist/btree_cash.c
@@ -24,14 +24,6 @@ PG_FUNCTION_INFO_V1(gbt_cash_distance);
 PG_FUNCTION_INFO_V1(gbt_cash_penalty);
 PG_FUNCTION_INFO_V1(gbt_cash_same);
 
-Datum		gbt_cash_compress(PG_FUNCTION_ARGS);
-Datum		gbt_cash_union(PG_FUNCTION_ARGS);
-Datum		gbt_cash_picksplit(PG_FUNCTION_ARGS);
-Datum		gbt_cash_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_cash_distance(PG_FUNCTION_ARGS);
-Datum		gbt_cash_penalty(PG_FUNCTION_ARGS);
-Datum		gbt_cash_same(PG_FUNCTION_ARGS);
-
 static bool
 gbt_cashgt(const void *a, const void *b)
 {
@@ -97,7 +89,6 @@ static const gbtree_ninfo tinfo =
 
 
 PG_FUNCTION_INFO_V1(cash_dist);
-Datum		cash_dist(PG_FUNCTION_ARGS);
 Datum
 cash_dist(PG_FUNCTION_ARGS)
 {
diff --git a/contrib/btree_gist/btree_date.c b/contrib/btree_gist/btree_date.c
index 1c0c3ec20c..9cab7ec42f 100644
--- a/contrib/btree_gist/btree_date.c
+++ b/contrib/btree_gist/btree_date.c
@@ -24,14 +24,6 @@ PG_FUNCTION_INFO_V1(gbt_date_distance);
 PG_FUNCTION_INFO_V1(gbt_date_penalty);
 PG_FUNCTION_INFO_V1(gbt_date_same);
 
-Datum		gbt_date_compress(PG_FUNCTION_ARGS);
-Datum		gbt_date_union(PG_FUNCTION_ARGS);
-Datum		gbt_date_picksplit(PG_FUNCTION_ARGS);
-Datum		gbt_date_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_date_distance(PG_FUNCTION_ARGS);
-Datum		gbt_date_penalty(PG_FUNCTION_ARGS);
-Datum		gbt_date_same(PG_FUNCTION_ARGS);
-
 static bool
 gbt_dategt(const void *a, const void *b)
 {
@@ -115,7 +107,6 @@ static const gbtree_ninfo tinfo =
 
 
 PG_FUNCTION_INFO_V1(date_dist);
-Datum		date_dist(PG_FUNCTION_ARGS);
 Datum
 date_dist(PG_FUNCTION_ARGS)
 {
diff --git a/contrib/btree_gist/btree_float4.c b/contrib/btree_gist/btree_float4.c
index cf1e45a381..55e1c4c1c6 100644
--- a/contrib/btree_gist/btree_float4.c
+++ b/contrib/btree_gist/btree_float4.c
@@ -23,14 +23,6 @@ PG_FUNCTION_INFO_V1(gbt_float4_distance);
 PG_FUNCTION_INFO_V1(gbt_float4_penalty);
 PG_FUNCTION_INFO_V1(gbt_float4_same);
 
-Datum		gbt_float4_compress(PG_FUNCTION_ARGS);
-Datum		gbt_float4_union(PG_FUNCTION_ARGS);
-Datum		gbt_float4_picksplit(PG_FUNCTION_ARGS);
-Datum		gbt_float4_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_float4_distance(PG_FUNCTION_ARGS);
-Datum		gbt_float4_penalty(PG_FUNCTION_ARGS);
-Datum		gbt_float4_same(PG_FUNCTION_ARGS);
-
 static bool
 gbt_float4gt(const void *a, const void *b)
 {
@@ -96,7 +88,6 @@ static const gbtree_ninfo tinfo =
 
 
 PG_FUNCTION_INFO_V1(float4_dist);
-Datum		float4_dist(PG_FUNCTION_ARGS);
 Datum
 float4_dist(PG_FUNCTION_ARGS)
 {
diff --git a/contrib/btree_gist/btree_float8.c b/contrib/btree_gist/btree_float8.c
index 3ce87642cb..62271dec84 100644
--- a/contrib/btree_gist/btree_float8.c
+++ b/contrib/btree_gist/btree_float8.c
@@ -23,14 +23,6 @@ PG_FUNCTION_INFO_V1(gbt_float8_distance);
 PG_FUNCTION_INFO_V1(gbt_float8_penalty);
 PG_FUNCTION_INFO_V1(gbt_float8_same);
 
-Datum		gbt_float8_compress(PG_FUNCTION_ARGS);
-Datum		gbt_float8_union(PG_FUNCTION_ARGS);
-Datum		gbt_float8_picksplit(PG_FUNCTION_ARGS);
-Datum		gbt_float8_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_float8_distance(PG_FUNCTION_ARGS);
-Datum		gbt_float8_penalty(PG_FUNCTION_ARGS);
-Datum		gbt_float8_same(PG_FUNCTION_ARGS);
-
 
 static bool
 gbt_float8gt(const void *a, const void *b)
@@ -104,7 +96,6 @@ static const gbtree_ninfo tinfo =
 
 
 PG_FUNCTION_INFO_V1(float8_dist);
-Datum		float8_dist(PG_FUNCTION_ARGS);
 Datum
 float8_dist(PG_FUNCTION_ARGS)
 {
diff --git a/contrib/btree_gist/btree_gist.c b/contrib/btree_gist/btree_gist.c
index f2d2ed2cb2..e1dc253c96 100644
--- a/contrib/btree_gist/btree_gist.c
+++ b/contrib/btree_gist/btree_gist.c
@@ -11,8 +11,6 @@ PG_FUNCTION_INFO_V1(gbt_decompress);
 PG_FUNCTION_INFO_V1(gbtreekey_in);
 PG_FUNCTION_INFO_V1(gbtreekey_out);
 
-Datum		gbt_decompress(PG_FUNCTION_ARGS);
-
 /**************************************************
  * In/Out for keys
  **************************************************/
diff --git a/contrib/btree_gist/btree_inet.c b/contrib/btree_gist/btree_inet.c
index c136296ab5..24ae6bf369 100644
--- a/contrib/btree_gist/btree_inet.c
+++ b/contrib/btree_gist/btree_inet.c
@@ -25,13 +25,6 @@ PG_FUNCTION_INFO_V1(gbt_inet_consistent);
 PG_FUNCTION_INFO_V1(gbt_inet_penalty);
 PG_FUNCTION_INFO_V1(gbt_inet_same);
 
-Datum		gbt_inet_compress(PG_FUNCTION_ARGS);
-Datum		gbt_inet_union(PG_FUNCTION_ARGS);
-Datum		gbt_inet_picksplit(PG_FUNCTION_ARGS);
-Datum		gbt_inet_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_inet_penalty(PG_FUNCTION_ARGS);
-Datum		gbt_inet_same(PG_FUNCTION_ARGS);
-
 
 static bool
 gbt_inetgt(const void *a, const void *b)
diff --git a/contrib/btree_gist/btree_int2.c b/contrib/btree_gist/btree_int2.c
index 6a438bf1f2..d51ad0c2ab 100644
--- a/contrib/btree_gist/btree_int2.c
+++ b/contrib/btree_gist/btree_int2.c
@@ -23,14 +23,6 @@ PG_FUNCTION_INFO_V1(gbt_int2_distance);
 PG_FUNCTION_INFO_V1(gbt_int2_penalty);
 PG_FUNCTION_INFO_V1(gbt_int2_same);
 
-Datum		gbt_int2_compress(PG_FUNCTION_ARGS);
-Datum		gbt_int2_union(PG_FUNCTION_ARGS);
-Datum		gbt_int2_picksplit(PG_FUNCTION_ARGS);
-Datum		gbt_int2_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_int2_distance(PG_FUNCTION_ARGS);
-Datum		gbt_int2_penalty(PG_FUNCTION_ARGS);
-Datum		gbt_int2_same(PG_FUNCTION_ARGS);
-
 static bool
 gbt_int2gt(const void *a, const void *b)
 {
@@ -96,7 +88,6 @@ static const gbtree_ninfo tinfo =
 
 
 PG_FUNCTION_INFO_V1(int2_dist);
-Datum		int2_dist(PG_FUNCTION_ARGS);
 Datum
 int2_dist(PG_FUNCTION_ARGS)
 {
diff --git a/contrib/btree_gist/btree_int4.c b/contrib/btree_gist/btree_int4.c
index df2164fc5e..e7641f2284 100644
--- a/contrib/btree_gist/btree_int4.c
+++ b/contrib/btree_gist/btree_int4.c
@@ -23,14 +23,6 @@ PG_FUNCTION_INFO_V1(gbt_int4_distance);
 PG_FUNCTION_INFO_V1(gbt_int4_penalty);
 PG_FUNCTION_INFO_V1(gbt_int4_same);
 
-Datum		gbt_int4_compress(PG_FUNCTION_ARGS);
-Datum		gbt_int4_union(PG_FUNCTION_ARGS);
-Datum		gbt_int4_picksplit(PG_FUNCTION_ARGS);
-Datum		gbt_int4_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_int4_distance(PG_FUNCTION_ARGS);
-Datum		gbt_int4_penalty(PG_FUNCTION_ARGS);
-Datum		gbt_int4_same(PG_FUNCTION_ARGS);
-
 
 static bool
 gbt_int4gt(const void *a, const void *b)
@@ -97,7 +89,6 @@ static const gbtree_ninfo tinfo =
 
 
 PG_FUNCTION_INFO_V1(int4_dist);
-Datum		int4_dist(PG_FUNCTION_ARGS);
 Datum
 int4_dist(PG_FUNCTION_ARGS)
 {
diff --git a/contrib/btree_gist/btree_int8.c b/contrib/btree_gist/btree_int8.c
index c05d8687fd..8bc8cb5fdf 100644
--- a/contrib/btree_gist/btree_int8.c
+++ b/contrib/btree_gist/btree_int8.c
@@ -23,14 +23,6 @@ PG_FUNCTION_INFO_V1(gbt_int8_distance);
 PG_FUNCTION_INFO_V1(gbt_int8_penalty);
 PG_FUNCTION_INFO_V1(gbt_int8_same);
 
-Datum		gbt_int8_compress(PG_FUNCTION_ARGS);
-Datum		gbt_int8_union(PG_FUNCTION_ARGS);
-Datum		gbt_int8_picksplit(PG_FUNCTION_ARGS);
-Datum		gbt_int8_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_int8_distance(PG_FUNCTION_ARGS);
-Datum		gbt_int8_penalty(PG_FUNCTION_ARGS);
-Datum		gbt_int8_same(PG_FUNCTION_ARGS);
-
 
 static bool
 gbt_int8gt(const void *a, const void *b)
@@ -97,7 +89,6 @@ static const gbtree_ninfo tinfo =
 
 
 PG_FUNCTION_INFO_V1(int8_dist);
-Datum		int8_dist(PG_FUNCTION_ARGS);
 Datum
 int8_dist(PG_FUNCTION_ARGS)
 {
diff --git a/contrib/btree_gist/btree_interval.c b/contrib/btree_gist/btree_interval.c
index bb779adf8e..e406d7120c 100644
--- a/contrib/btree_gist/btree_interval.c
+++ b/contrib/btree_gist/btree_interval.c
@@ -26,15 +26,6 @@ PG_FUNCTION_INFO_V1(gbt_intv_distance);
 PG_FUNCTION_INFO_V1(gbt_intv_penalty);
 PG_FUNCTION_INFO_V1(gbt_intv_same);
 
-Datum		gbt_intv_compress(PG_FUNCTION_ARGS);
-Datum		gbt_intv_decompress(PG_FUNCTION_ARGS);
-Datum		gbt_intv_union(PG_FUNCTION_ARGS);
-Datum		gbt_intv_picksplit(PG_FUNCTION_ARGS);
-Datum		gbt_intv_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_intv_distance(PG_FUNCTION_ARGS);
-Datum		gbt_intv_penalty(PG_FUNCTION_ARGS);
-Datum		gbt_intv_same(PG_FUNCTION_ARGS);
-
 
 static bool
 gbt_intvgt(const void *a, const void *b)
@@ -129,7 +120,6 @@ abs_interval(Interval *a)
 }
 
 PG_FUNCTION_INFO_V1(interval_dist);
-Datum		interval_dist(PG_FUNCTION_ARGS);
 Datum
 interval_dist(PG_FUNCTION_ARGS)
 {
diff --git a/contrib/btree_gist/btree_macaddr.c b/contrib/btree_gist/btree_macaddr.c
index 31125beda6..6255564ac5 100644
--- a/contrib/btree_gist/btree_macaddr.c
+++ b/contrib/btree_gist/btree_macaddr.c
@@ -24,13 +24,6 @@ PG_FUNCTION_INFO_V1(gbt_macad_consistent);
 PG_FUNCTION_INFO_V1(gbt_macad_penalty);
 PG_FUNCTION_INFO_V1(gbt_macad_same);
 
-Datum		gbt_macad_compress(PG_FUNCTION_ARGS);
-Datum		gbt_macad_union(PG_FUNCTION_ARGS);
-Datum		gbt_macad_picksplit(PG_FUNCTION_ARGS);
-Datum		gbt_macad_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_macad_penalty(PG_FUNCTION_ARGS);
-Datum		gbt_macad_same(PG_FUNCTION_ARGS);
-
 
 static bool
 gbt_macadgt(const void *a, const void *b)
diff --git a/contrib/btree_gist/btree_numeric.c b/contrib/btree_gist/btree_numeric.c
index 37938aff6a..02ccca8647 100644
--- a/contrib/btree_gist/btree_numeric.c
+++ b/contrib/btree_gist/btree_numeric.c
@@ -23,13 +23,6 @@ PG_FUNCTION_INFO_V1(gbt_numeric_consistent);
 PG_FUNCTION_INFO_V1(gbt_numeric_penalty);
 PG_FUNCTION_INFO_V1(gbt_numeric_same);
 
-Datum		gbt_numeric_compress(PG_FUNCTION_ARGS);
-Datum		gbt_numeric_union(PG_FUNCTION_ARGS);
-Datum		gbt_numeric_picksplit(PG_FUNCTION_ARGS);
-Datum		gbt_numeric_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_numeric_penalty(PG_FUNCTION_ARGS);
-Datum		gbt_numeric_same(PG_FUNCTION_ARGS);
-
 
 /* define for comparison */
 
diff --git a/contrib/btree_gist/btree_oid.c b/contrib/btree_gist/btree_oid.c
index e80a23c0b1..dcd0765417 100644
--- a/contrib/btree_gist/btree_oid.c
+++ b/contrib/btree_gist/btree_oid.c
@@ -23,14 +23,6 @@ PG_FUNCTION_INFO_V1(gbt_oid_distance);
 PG_FUNCTION_INFO_V1(gbt_oid_penalty);
 PG_FUNCTION_INFO_V1(gbt_oid_same);
 
-Datum		gbt_oid_compress(PG_FUNCTION_ARGS);
-Datum		gbt_oid_union(PG_FUNCTION_ARGS);
-Datum		gbt_oid_picksplit(PG_FUNCTION_ARGS);
-Datum		gbt_oid_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_oid_distance(PG_FUNCTION_ARGS);
-Datum		gbt_oid_penalty(PG_FUNCTION_ARGS);
-Datum		gbt_oid_same(PG_FUNCTION_ARGS);
-
 
 static bool
 gbt_oidgt(const void *a, const void *b)
@@ -103,7 +95,6 @@ static const gbtree_ninfo tinfo =
 
 
 PG_FUNCTION_INFO_V1(oid_dist);
-Datum		oid_dist(PG_FUNCTION_ARGS);
 Datum
 oid_dist(PG_FUNCTION_ARGS)
 {
diff --git a/contrib/btree_gist/btree_text.c b/contrib/btree_gist/btree_text.c
index 56790a9983..2e00cb60ba 100644
--- a/contrib/btree_gist/btree_text.c
+++ b/contrib/btree_gist/btree_text.c
@@ -19,15 +19,6 @@ PG_FUNCTION_INFO_V1(gbt_bpchar_consistent);
 PG_FUNCTION_INFO_V1(gbt_text_penalty);
 PG_FUNCTION_INFO_V1(gbt_text_same);
 
-Datum		gbt_text_compress(PG_FUNCTION_ARGS);
-Datum		gbt_bpchar_compress(PG_FUNCTION_ARGS);
-Datum		gbt_text_union(PG_FUNCTION_ARGS);
-Datum		gbt_text_picksplit(PG_FUNCTION_ARGS);
-Datum		gbt_text_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_bpchar_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_text_penalty(PG_FUNCTION_ARGS);
-Datum		gbt_text_same(PG_FUNCTION_ARGS);
-
 
 /* define for comparison */
 
diff --git a/contrib/btree_gist/btree_time.c b/contrib/btree_gist/btree_time.c
index a148e5e120..e0e32428e2 100644
--- a/contrib/btree_gist/btree_time.c
+++ b/contrib/btree_gist/btree_time.c
@@ -27,16 +27,6 @@ PG_FUNCTION_INFO_V1(gbt_timetz_consistent);
 PG_FUNCTION_INFO_V1(gbt_time_penalty);
 PG_FUNCTION_INFO_V1(gbt_time_same);
 
-Datum		gbt_time_compress(PG_FUNCTION_ARGS);
-Datum		gbt_timetz_compress(PG_FUNCTION_ARGS);
-Datum		gbt_time_union(PG_FUNCTION_ARGS);
-Datum		gbt_time_picksplit(PG_FUNCTION_ARGS);
-Datum		gbt_time_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_time_distance(PG_FUNCTION_ARGS);
-Datum		gbt_timetz_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_time_penalty(PG_FUNCTION_ARGS);
-Datum		gbt_time_same(PG_FUNCTION_ARGS);
-
 
 #ifdef USE_FLOAT8_BYVAL
 #define TimeADTGetDatumFast(X) TimeADTGetDatum(X)
@@ -145,7 +135,6 @@ static const gbtree_ninfo tinfo =
 
 
 PG_FUNCTION_INFO_V1(time_dist);
-Datum		time_dist(PG_FUNCTION_ARGS);
 Datum
 time_dist(PG_FUNCTION_ARGS)
 {
diff --git a/contrib/btree_gist/btree_ts.c b/contrib/btree_gist/btree_ts.c
index bf82709dd8..10f325d672 100644
--- a/contrib/btree_gist/btree_ts.c
+++ b/contrib/btree_gist/btree_ts.c
@@ -28,17 +28,6 @@ PG_FUNCTION_INFO_V1(gbt_tstz_distance);
 PG_FUNCTION_INFO_V1(gbt_ts_penalty);
 PG_FUNCTION_INFO_V1(gbt_ts_same);
 
-Datum		gbt_ts_compress(PG_FUNCTION_ARGS);
-Datum		gbt_tstz_compress(PG_FUNCTION_ARGS);
-Datum		gbt_ts_union(PG_FUNCTION_ARGS);
-Datum		gbt_ts_picksplit(PG_FUNCTION_ARGS);
-Datum		gbt_ts_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_ts_distance(PG_FUNCTION_ARGS);
-Datum		gbt_tstz_consistent(PG_FUNCTION_ARGS);
-Datum		gbt_tstz_distance(PG_FUNCTION_ARGS);
-Datum		gbt_ts_penalty(PG_FUNCTION_ARGS);
-Datum		gbt_ts_same(PG_FUNCTION_ARGS);
-
 
 #ifdef USE_FLOAT8_BYVAL
 #define TimestampGetDatumFast(X) TimestampGetDatum(X)
@@ -149,7 +138,6 @@ static const gbtree_ninfo tinfo =
 
 
 PG_FUNCTION_INFO_V1(ts_dist);
-Datum		ts_dist(PG_FUNCTION_ARGS);
 Datum
 ts_dist(PG_FUNCTION_ARGS)
 {
@@ -178,7 +166,6 @@ ts_dist(PG_FUNCTION_ARGS)
 }
 
 PG_FUNCTION_INFO_V1(tstz_dist);
-Datum		tstz_dist(PG_FUNCTION_ARGS);
 Datum
 tstz_dist(PG_FUNCTION_ARGS)
 {
diff --git a/contrib/btree_gist/btree_utils_var.c b/contrib/btree_gist/btree_utils_var.c
index c7c6faafc6..09b51fc9c9 100644
--- a/contrib/btree_gist/btree_utils_var.c
+++ b/contrib/btree_gist/btree_utils_var.c
@@ -29,7 +29,6 @@ typedef struct
 
 
 PG_FUNCTION_INFO_V1(gbt_var_decompress);
-Datum		gbt_var_decompress(PG_FUNCTION_ARGS);
 
 
 Datum
diff --git a/contrib/chkpass/chkpass.c b/contrib/chkpass/chkpass.c
index 1795b8cde4..283ad9a538 100644
--- a/contrib/chkpass/chkpass.c
+++ b/contrib/chkpass/chkpass.c
@@ -39,18 +39,6 @@ typedef struct chkpass
 	char		password[16];
 } chkpass;
 
-/*
- * Various forward declarations:
- */
-
-Datum		chkpass_in(PG_FUNCTION_ARGS);
-Datum		chkpass_out(PG_FUNCTION_ARGS);
-Datum		chkpass_rout(PG_FUNCTION_ARGS);
-
-/* Only equal or not equal make sense */
-Datum		chkpass_eq(PG_FUNCTION_ARGS);
-Datum		chkpass_ne(PG_FUNCTION_ARGS);
-
 
 /* This function checks that the password is a good one
  * It's just a placeholder for now */
diff --git a/contrib/citext/citext.c b/contrib/citext/citext.c
index a584f57455..1174b70aa7 100644
--- a/contrib/citext/citext.c
+++ b/contrib/citext/citext.c
@@ -19,16 +19,6 @@ PG_MODULE_MAGIC;
  */
 
 static int32 citextcmp(text *left, text *right, Oid collid);
-extern Datum citext_cmp(PG_FUNCTION_ARGS);
-extern Datum citext_hash(PG_FUNCTION_ARGS);
-extern Datum citext_eq(PG_FUNCTION_ARGS);
-extern Datum citext_ne(PG_FUNCTION_ARGS);
-extern Datum citext_gt(PG_FUNCTION_ARGS);
-extern Datum citext_ge(PG_FUNCTION_ARGS);
-extern Datum citext_lt(PG_FUNCTION_ARGS);
-extern Datum citext_le(PG_FUNCTION_ARGS);
-extern Datum citext_smaller(PG_FUNCTION_ARGS);
-extern Datum citext_larger(PG_FUNCTION_ARGS);
 
 /*
  *		=================
diff --git a/contrib/cube/cube.c b/contrib/cube/cube.c
index 9524943ca8..906cc9efc7 100644
--- a/contrib/cube/cube.c
+++ b/contrib/cube/cube.c
@@ -47,19 +47,6 @@ PG_FUNCTION_INFO_V1(cube_ll_coord);
 PG_FUNCTION_INFO_V1(cube_ur_coord);
 PG_FUNCTION_INFO_V1(cube_subset);
 
-Datum		cube_in(PG_FUNCTION_ARGS);
-Datum		cube_a_f8_f8(PG_FUNCTION_ARGS);
-Datum		cube_a_f8(PG_FUNCTION_ARGS);
-Datum		cube_out(PG_FUNCTION_ARGS);
-Datum		cube_f8(PG_FUNCTION_ARGS);
-Datum		cube_f8_f8(PG_FUNCTION_ARGS);
-Datum		cube_c_f8(PG_FUNCTION_ARGS);
-Datum		cube_c_f8_f8(PG_FUNCTION_ARGS);
-Datum		cube_dim(PG_FUNCTION_ARGS);
-Datum		cube_ll_coord(PG_FUNCTION_ARGS);
-Datum		cube_ur_coord(PG_FUNCTION_ARGS);
-Datum		cube_subset(PG_FUNCTION_ARGS);
-
 /*
 ** GiST support methods
 */
@@ -72,14 +59,6 @@ PG_FUNCTION_INFO_V1(g_cube_picksplit);
 PG_FUNCTION_INFO_V1(g_cube_union);
 PG_FUNCTION_INFO_V1(g_cube_same);
 
-Datum		g_cube_consistent(PG_FUNCTION_ARGS);
-Datum		g_cube_compress(PG_FUNCTION_ARGS);
-Datum		g_cube_decompress(PG_FUNCTION_ARGS);
-Datum		g_cube_penalty(PG_FUNCTION_ARGS);
-Datum		g_cube_picksplit(PG_FUNCTION_ARGS);
-Datum		g_cube_union(PG_FUNCTION_ARGS);
-Datum		g_cube_same(PG_FUNCTION_ARGS);
-
 /*
 ** B-tree support functions
 */
@@ -91,14 +70,6 @@ PG_FUNCTION_INFO_V1(cube_le);
 PG_FUNCTION_INFO_V1(cube_ge);
 PG_FUNCTION_INFO_V1(cube_cmp);
 
-Datum		cube_eq(PG_FUNCTION_ARGS);
-Datum		cube_ne(PG_FUNCTION_ARGS);
-Datum		cube_lt(PG_FUNCTION_ARGS);
-Datum		cube_gt(PG_FUNCTION_ARGS);
-Datum		cube_le(PG_FUNCTION_ARGS);
-Datum		cube_ge(PG_FUNCTION_ARGS);
-Datum		cube_cmp(PG_FUNCTION_ARGS);
-
 /*
 ** R-tree support functions
 */
@@ -110,13 +81,6 @@ PG_FUNCTION_INFO_V1(cube_union);
 PG_FUNCTION_INFO_V1(cube_inter);
 PG_FUNCTION_INFO_V1(cube_size);
 
-Datum		cube_contains(PG_FUNCTION_ARGS);
-Datum		cube_contained(PG_FUNCTION_ARGS);
-Datum		cube_overlap(PG_FUNCTION_ARGS);
-Datum		cube_union(PG_FUNCTION_ARGS);
-Datum		cube_inter(PG_FUNCTION_ARGS);
-Datum		cube_size(PG_FUNCTION_ARGS);
-
 /*
 ** miscellaneous
 */
@@ -124,10 +88,6 @@ PG_FUNCTION_INFO_V1(cube_distance);
 PG_FUNCTION_INFO_V1(cube_is_point);
 PG_FUNCTION_INFO_V1(cube_enlarge);
 
-Datum		cube_distance(PG_FUNCTION_ARGS);
-Datum		cube_is_point(PG_FUNCTION_ARGS);
-Datum		cube_enlarge(PG_FUNCTION_ARGS);
-
 /*
 ** For internal use only
 */
diff --git a/contrib/dict_int/dict_int.c b/contrib/dict_int/dict_int.c
index b05138e29d..79067a86f0 100644
--- a/contrib/dict_int/dict_int.c
+++ b/contrib/dict_int/dict_int.c
@@ -26,10 +26,7 @@ typedef struct
 
 
 PG_FUNCTION_INFO_V1(dintdict_init);
-Datum		dintdict_init(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(dintdict_lexize);
-Datum		dintdict_lexize(PG_FUNCTION_ARGS);
 
 Datum
 dintdict_init(PG_FUNCTION_ARGS)
diff --git a/contrib/dict_xsyn/dict_xsyn.c b/contrib/dict_xsyn/dict_xsyn.c
index f0084a96c4..1c27565f5e 100644
--- a/contrib/dict_xsyn/dict_xsyn.c
+++ b/contrib/dict_xsyn/dict_xsyn.c
@@ -40,10 +40,7 @@ typedef struct
 
 
 PG_FUNCTION_INFO_V1(dxsyn_init);
-Datum		dxsyn_init(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(dxsyn_lexize);
-Datum		dxsyn_lexize(PG_FUNCTION_ARGS);
 
 static char *
 find_word(char *in, char **end)
diff --git a/contrib/earthdistance/earthdistance.c b/contrib/earthdistance/earthdistance.c
index 2f344a7011..eadfce4605 100644
--- a/contrib/earthdistance/earthdistance.c
+++ b/contrib/earthdistance/earthdistance.c
@@ -99,8 +99,6 @@ geo_distance_internal(Point *pt1, Point *pt2)
 
 #ifdef USE_FLOAT8_BYVAL
 
-Datum		geo_distance(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(geo_distance);
 
 Datum
diff --git a/contrib/file_fdw/file_fdw.c b/contrib/file_fdw/file_fdw.c
index 7fb1dbcff3..4f84e3bcea 100644
--- a/contrib/file_fdw/file_fdw.c
+++ b/contrib/file_fdw/file_fdw.c
@@ -102,9 +102,6 @@ typedef struct FileFdwExecutionState
 /*
  * SQL functions
  */
-extern Datum file_fdw_handler(PG_FUNCTION_ARGS);
-extern Datum file_fdw_validator(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(file_fdw_handler);
 PG_FUNCTION_INFO_V1(file_fdw_validator);
 
diff --git a/contrib/fuzzystrmatch/dmetaphone.c b/contrib/fuzzystrmatch/dmetaphone.c
index 19413b481a..5001288bb6 100644
--- a/contrib/fuzzystrmatch/dmetaphone.c
+++ b/contrib/fuzzystrmatch/dmetaphone.c
@@ -114,9 +114,6 @@ The remaining code is authored by Andrew Dunstan <amdunstan@ncshp.org> and
 #include <stdarg.h>
 #include <assert.h>
 
-extern Datum dmetaphone(PG_FUNCTION_ARGS);
-extern Datum dmetaphone_alt(PG_FUNCTION_ARGS);
-
 /* prototype for the main function we got from the perl module */
 static void DoubleMetaphone(char *, char **);
 
diff --git a/contrib/fuzzystrmatch/fuzzystrmatch.c b/contrib/fuzzystrmatch/fuzzystrmatch.c
index 218eced921..7a53d8a008 100644
--- a/contrib/fuzzystrmatch/fuzzystrmatch.c
+++ b/contrib/fuzzystrmatch/fuzzystrmatch.c
@@ -45,18 +45,6 @@
 
 PG_MODULE_MAGIC;
 
-
-/*
- * External declarations for exported functions
- */
-extern Datum levenshtein_with_costs(PG_FUNCTION_ARGS);
-extern Datum levenshtein(PG_FUNCTION_ARGS);
-extern Datum levenshtein_less_equal_with_costs(PG_FUNCTION_ARGS);
-extern Datum levenshtein_less_equal(PG_FUNCTION_ARGS);
-extern Datum metaphone(PG_FUNCTION_ARGS);
-extern Datum soundex(PG_FUNCTION_ARGS);
-extern Datum difference(PG_FUNCTION_ARGS);
-
 /*
  * Soundex
  */
diff --git a/contrib/hstore/hstore.h b/contrib/hstore/hstore.h
index 37e4611853..382111617a 100644
--- a/contrib/hstore/hstore.h
+++ b/contrib/hstore/hstore.h
@@ -194,7 +194,6 @@ extern Pairs *hstoreArrayToPairs(ArrayType *a, int *npairs);
 #if HSTORE_POLLUTE_NAMESPACE
 #define HSTORE_POLLUTE(newname_,oldname_) \
 	PG_FUNCTION_INFO_V1(oldname_);		  \
-	Datum oldname_(PG_FUNCTION_ARGS);	  \
 	Datum newname_(PG_FUNCTION_ARGS);	  \
 	Datum oldname_(PG_FUNCTION_ARGS) { return newname_(fcinfo); } \
 	extern int no_such_variable
diff --git a/contrib/hstore/hstore_compat.c b/contrib/hstore/hstore_compat.c
index 6327a8e8bb..6364f032f9 100644
--- a/contrib/hstore/hstore_compat.c
+++ b/contrib/hstore/hstore_compat.c
@@ -357,7 +357,6 @@ hstoreUpgrade(Datum orig)
 
 
 PG_FUNCTION_INFO_V1(hstore_version_diag);
-Datum		hstore_version_diag(PG_FUNCTION_ARGS);
 Datum
 hstore_version_diag(PG_FUNCTION_ARGS)
 {
diff --git a/contrib/hstore/hstore_gin.c b/contrib/hstore/hstore_gin.c
index 2007801cf0..9f2de06f7f 100644
--- a/contrib/hstore/hstore_gin.c
+++ b/contrib/hstore/hstore_gin.c
@@ -22,7 +22,6 @@
 #define NULLFLAG	'N'
 
 PG_FUNCTION_INFO_V1(gin_extract_hstore);
-Datum		gin_extract_hstore(PG_FUNCTION_ARGS);
 
 /* Build an indexable text value */
 static text *
@@ -76,7 +75,6 @@ gin_extract_hstore(PG_FUNCTION_ARGS)
 }
 
 PG_FUNCTION_INFO_V1(gin_extract_hstore_query);
-Datum		gin_extract_hstore_query(PG_FUNCTION_ARGS);
 
 Datum
 gin_extract_hstore_query(PG_FUNCTION_ARGS)
@@ -148,7 +146,6 @@ gin_extract_hstore_query(PG_FUNCTION_ARGS)
 }
 
 PG_FUNCTION_INFO_V1(gin_consistent_hstore);
-Datum		gin_consistent_hstore(PG_FUNCTION_ARGS);
 
 Datum
 gin_consistent_hstore(PG_FUNCTION_ARGS)
diff --git a/contrib/hstore/hstore_gist.c b/contrib/hstore/hstore_gist.c
index 9001180142..d4a9aaa4c1 100644
--- a/contrib/hstore/hstore_gist.c
+++ b/contrib/hstore/hstore_gist.c
@@ -69,10 +69,7 @@ typedef struct
 #define WISH_F(a,b,c) (double)( -(double)(((a)-(b))*((a)-(b))*((a)-(b)))*(c) )
 
 PG_FUNCTION_INFO_V1(ghstore_in);
-Datum		ghstore_in(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(ghstore_out);
-Datum		ghstore_out(PG_FUNCTION_ARGS);
 
 
 Datum
@@ -97,14 +94,6 @@ PG_FUNCTION_INFO_V1(ghstore_picksplit);
 PG_FUNCTION_INFO_V1(ghstore_union);
 PG_FUNCTION_INFO_V1(ghstore_same);
 
-Datum		ghstore_consistent(PG_FUNCTION_ARGS);
-Datum		ghstore_compress(PG_FUNCTION_ARGS);
-Datum		ghstore_decompress(PG_FUNCTION_ARGS);
-Datum		ghstore_penalty(PG_FUNCTION_ARGS);
-Datum		ghstore_picksplit(PG_FUNCTION_ARGS);
-Datum		ghstore_union(PG_FUNCTION_ARGS);
-Datum		ghstore_same(PG_FUNCTION_ARGS);
-
 Datum
 ghstore_compress(PG_FUNCTION_ARGS)
 {
diff --git a/contrib/hstore/hstore_io.c b/contrib/hstore/hstore_io.c
index 6ec0b9cbf1..9899317bfc 100644
--- a/contrib/hstore/hstore_io.c
+++ b/contrib/hstore/hstore_io.c
@@ -401,7 +401,6 @@ hstorePairs(Pairs *pairs, int32 pcount, int32 buflen)
 
 
 PG_FUNCTION_INFO_V1(hstore_in);
-Datum		hstore_in(PG_FUNCTION_ARGS);
 Datum
 hstore_in(PG_FUNCTION_ARGS)
 {
@@ -422,7 +421,6 @@ hstore_in(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_recv);
-Datum		hstore_recv(PG_FUNCTION_ARGS);
 Datum
 hstore_recv(PG_FUNCTION_ARGS)
 {
@@ -486,7 +484,6 @@ hstore_recv(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_from_text);
-Datum		hstore_from_text(PG_FUNCTION_ARGS);
 Datum
 hstore_from_text(PG_FUNCTION_ARGS)
 {
@@ -523,7 +520,6 @@ hstore_from_text(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_from_arrays);
-Datum		hstore_from_arrays(PG_FUNCTION_ARGS);
 Datum
 hstore_from_arrays(PG_FUNCTION_ARGS)
 {
@@ -641,7 +637,6 @@ hstore_from_arrays(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_from_array);
-Datum		hstore_from_array(PG_FUNCTION_ARGS);
 Datum
 hstore_from_array(PG_FUNCTION_ARGS)
 {
@@ -755,7 +750,6 @@ typedef struct RecordIOData
 } RecordIOData;
 
 PG_FUNCTION_INFO_V1(hstore_from_record);
-Datum		hstore_from_record(PG_FUNCTION_ARGS);
 Datum
 hstore_from_record(PG_FUNCTION_ARGS)
 {
@@ -909,7 +903,6 @@ hstore_from_record(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_populate_record);
-Datum		hstore_populate_record(PG_FUNCTION_ARGS);
 Datum
 hstore_populate_record(PG_FUNCTION_ARGS)
 {
@@ -1122,7 +1115,6 @@ cpw(char *dst, char *src, int len)
 }
 
 PG_FUNCTION_INFO_V1(hstore_out);
-Datum		hstore_out(PG_FUNCTION_ARGS);
 Datum
 hstore_out(PG_FUNCTION_ARGS)
 {
@@ -1194,7 +1186,6 @@ hstore_out(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_send);
-Datum		hstore_send(PG_FUNCTION_ARGS);
 Datum
 hstore_send(PG_FUNCTION_ARGS)
 {
@@ -1241,7 +1232,6 @@ hstore_send(PG_FUNCTION_ARGS)
  * (think zip codes or phone numbers starting with 0).
  */
 PG_FUNCTION_INFO_V1(hstore_to_json_loose);
-Datum		hstore_to_json_loose(PG_FUNCTION_ARGS);
 Datum
 hstore_to_json_loose(PG_FUNCTION_ARGS)
 {
@@ -1333,7 +1323,6 @@ hstore_to_json_loose(PG_FUNCTION_ARGS)
 }
 
 PG_FUNCTION_INFO_V1(hstore_to_json);
-Datum		hstore_to_json(PG_FUNCTION_ARGS);
 Datum
 hstore_to_json(PG_FUNCTION_ARGS)
 {
@@ -1377,7 +1366,6 @@ hstore_to_json(PG_FUNCTION_ARGS)
 }
 
 PG_FUNCTION_INFO_V1(hstore_to_jsonb);
-Datum		hstore_to_jsonb(PG_FUNCTION_ARGS);
 Datum
 hstore_to_jsonb(PG_FUNCTION_ARGS)
 {
@@ -1425,7 +1413,6 @@ hstore_to_jsonb(PG_FUNCTION_ARGS)
 }
 
 PG_FUNCTION_INFO_V1(hstore_to_jsonb_loose);
-Datum		hstore_to_jsonb_loose(PG_FUNCTION_ARGS);
 Datum
 hstore_to_jsonb_loose(PG_FUNCTION_ARGS)
 {
diff --git a/contrib/hstore/hstore_op.c b/contrib/hstore/hstore_op.c
index 8ba7a05a65..9e18a2b512 100644
--- a/contrib/hstore/hstore_op.c
+++ b/contrib/hstore/hstore_op.c
@@ -127,7 +127,6 @@ hstoreArrayToPairs(ArrayType *a, int *npairs)
 
 
 PG_FUNCTION_INFO_V1(hstore_fetchval);
-Datum		hstore_fetchval(PG_FUNCTION_ARGS);
 Datum
 hstore_fetchval(PG_FUNCTION_ARGS)
 {
@@ -149,7 +148,6 @@ hstore_fetchval(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_exists);
-Datum		hstore_exists(PG_FUNCTION_ARGS);
 Datum
 hstore_exists(PG_FUNCTION_ARGS)
 {
@@ -163,7 +161,6 @@ hstore_exists(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_exists_any);
-Datum		hstore_exists_any(PG_FUNCTION_ARGS);
 Datum
 hstore_exists_any(PG_FUNCTION_ARGS)
 {
@@ -198,7 +195,6 @@ hstore_exists_any(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_exists_all);
-Datum		hstore_exists_all(PG_FUNCTION_ARGS);
 Datum
 hstore_exists_all(PG_FUNCTION_ARGS)
 {
@@ -233,7 +229,6 @@ hstore_exists_all(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_defined);
-Datum		hstore_defined(PG_FUNCTION_ARGS);
 Datum
 hstore_defined(PG_FUNCTION_ARGS)
 {
@@ -249,7 +244,6 @@ hstore_defined(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_delete);
-Datum		hstore_delete(PG_FUNCTION_ARGS);
 Datum
 hstore_delete(PG_FUNCTION_ARGS)
 {
@@ -296,7 +290,6 @@ hstore_delete(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_delete_array);
-Datum		hstore_delete_array(PG_FUNCTION_ARGS);
 Datum
 hstore_delete_array(PG_FUNCTION_ARGS)
 {
@@ -376,7 +369,6 @@ hstore_delete_array(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_delete_hstore);
-Datum		hstore_delete_hstore(PG_FUNCTION_ARGS);
 Datum
 hstore_delete_hstore(PG_FUNCTION_ARGS)
 {
@@ -476,7 +468,6 @@ hstore_delete_hstore(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_concat);
-Datum		hstore_concat(PG_FUNCTION_ARGS);
 Datum
 hstore_concat(PG_FUNCTION_ARGS)
 {
@@ -575,7 +566,6 @@ hstore_concat(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_slice_to_array);
-Datum		hstore_slice_to_array(PG_FUNCTION_ARGS);
 Datum
 hstore_slice_to_array(PG_FUNCTION_ARGS)
 {
@@ -639,7 +629,6 @@ hstore_slice_to_array(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_slice_to_hstore);
-Datum		hstore_slice_to_hstore(PG_FUNCTION_ARGS);
 Datum
 hstore_slice_to_hstore(PG_FUNCTION_ARGS)
 {
@@ -702,7 +691,6 @@ hstore_slice_to_hstore(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_akeys);
-Datum		hstore_akeys(PG_FUNCTION_ARGS);
 Datum
 hstore_akeys(PG_FUNCTION_ARGS)
 {
@@ -738,7 +726,6 @@ hstore_akeys(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_avals);
-Datum		hstore_avals(PG_FUNCTION_ARGS);
 Datum
 hstore_avals(PG_FUNCTION_ARGS)
 {
@@ -835,7 +822,6 @@ hstore_to_array_internal(HStore *hs, int ndims)
 }
 
 PG_FUNCTION_INFO_V1(hstore_to_array);
-Datum		hstore_to_array(PG_FUNCTION_ARGS);
 Datum
 hstore_to_array(PG_FUNCTION_ARGS)
 {
@@ -846,7 +832,6 @@ hstore_to_array(PG_FUNCTION_ARGS)
 }
 
 PG_FUNCTION_INFO_V1(hstore_to_matrix);
-Datum		hstore_to_matrix(PG_FUNCTION_ARGS);
 Datum
 hstore_to_matrix(PG_FUNCTION_ARGS)
 {
@@ -895,7 +880,6 @@ setup_firstcall(FuncCallContext *funcctx, HStore *hs,
 
 
 PG_FUNCTION_INFO_V1(hstore_skeys);
-Datum		hstore_skeys(PG_FUNCTION_ARGS);
 Datum
 hstore_skeys(PG_FUNCTION_ARGS)
 {
@@ -930,7 +914,6 @@ hstore_skeys(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_svals);
-Datum		hstore_svals(PG_FUNCTION_ARGS);
 Datum
 hstore_svals(PG_FUNCTION_ARGS)
 {
@@ -979,7 +962,6 @@ hstore_svals(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_contains);
-Datum		hstore_contains(PG_FUNCTION_ARGS);
 Datum
 hstore_contains(PG_FUNCTION_ARGS)
 {
@@ -1026,7 +1008,6 @@ hstore_contains(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_contained);
-Datum		hstore_contained(PG_FUNCTION_ARGS);
 Datum
 hstore_contained(PG_FUNCTION_ARGS)
 {
@@ -1038,7 +1019,6 @@ hstore_contained(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_each);
-Datum		hstore_each(PG_FUNCTION_ARGS);
 Datum
 hstore_each(PG_FUNCTION_ARGS)
 {
@@ -1100,7 +1080,6 @@ hstore_each(PG_FUNCTION_ARGS)
  */
 
 PG_FUNCTION_INFO_V1(hstore_cmp);
-Datum		hstore_cmp(PG_FUNCTION_ARGS);
 Datum
 hstore_cmp(PG_FUNCTION_ARGS)
 {
@@ -1182,7 +1161,6 @@ hstore_cmp(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_eq);
-Datum		hstore_eq(PG_FUNCTION_ARGS);
 Datum
 hstore_eq(PG_FUNCTION_ARGS)
 {
@@ -1194,7 +1172,6 @@ hstore_eq(PG_FUNCTION_ARGS)
 }
 
 PG_FUNCTION_INFO_V1(hstore_ne);
-Datum		hstore_ne(PG_FUNCTION_ARGS);
 Datum
 hstore_ne(PG_FUNCTION_ARGS)
 {
@@ -1206,7 +1183,6 @@ hstore_ne(PG_FUNCTION_ARGS)
 }
 
 PG_FUNCTION_INFO_V1(hstore_gt);
-Datum		hstore_gt(PG_FUNCTION_ARGS);
 Datum
 hstore_gt(PG_FUNCTION_ARGS)
 {
@@ -1218,7 +1194,6 @@ hstore_gt(PG_FUNCTION_ARGS)
 }
 
 PG_FUNCTION_INFO_V1(hstore_ge);
-Datum		hstore_ge(PG_FUNCTION_ARGS);
 Datum
 hstore_ge(PG_FUNCTION_ARGS)
 {
@@ -1230,7 +1205,6 @@ hstore_ge(PG_FUNCTION_ARGS)
 }
 
 PG_FUNCTION_INFO_V1(hstore_lt);
-Datum		hstore_lt(PG_FUNCTION_ARGS);
 Datum
 hstore_lt(PG_FUNCTION_ARGS)
 {
@@ -1242,7 +1216,6 @@ hstore_lt(PG_FUNCTION_ARGS)
 }
 
 PG_FUNCTION_INFO_V1(hstore_le);
-Datum		hstore_le(PG_FUNCTION_ARGS);
 Datum
 hstore_le(PG_FUNCTION_ARGS)
 {
@@ -1255,7 +1228,6 @@ hstore_le(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(hstore_hash);
-Datum		hstore_hash(PG_FUNCTION_ARGS);
 Datum
 hstore_hash(PG_FUNCTION_ARGS)
 {
diff --git a/contrib/intarray/_int_bool.c b/contrib/intarray/_int_bool.c
index b18e997748..566a6c2505 100644
--- a/contrib/intarray/_int_bool.c
+++ b/contrib/intarray/_int_bool.c
@@ -10,17 +10,9 @@
 
 PG_FUNCTION_INFO_V1(bqarr_in);
 PG_FUNCTION_INFO_V1(bqarr_out);
-Datum		bqarr_in(PG_FUNCTION_ARGS);
-Datum		bqarr_out(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(boolop);
-Datum		boolop(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(rboolop);
-Datum		rboolop(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(querytree);
-Datum		querytree(PG_FUNCTION_ARGS);
 
 
 /* parser's states */
diff --git a/contrib/intarray/_int_gin.c b/contrib/intarray/_int_gin.c
index be71e5ce69..58352cac80 100644
--- a/contrib/intarray/_int_gin.c
+++ b/contrib/intarray/_int_gin.c
@@ -10,7 +10,6 @@
 #include "_int.h"
 
 PG_FUNCTION_INFO_V1(ginint4_queryextract);
-Datum		ginint4_queryextract(PG_FUNCTION_ARGS);
 
 Datum
 ginint4_queryextract(PG_FUNCTION_ARGS)
@@ -108,7 +107,6 @@ ginint4_queryextract(PG_FUNCTION_ARGS)
 }
 
 PG_FUNCTION_INFO_V1(ginint4_consistent);
-Datum		ginint4_consistent(PG_FUNCTION_ARGS);
 
 Datum
 ginint4_consistent(PG_FUNCTION_ARGS)
diff --git a/contrib/intarray/_int_gist.c b/contrib/intarray/_int_gist.c
index 60de393bdf..d64a81a559 100644
--- a/contrib/intarray/_int_gist.c
+++ b/contrib/intarray/_int_gist.c
@@ -21,14 +21,6 @@ PG_FUNCTION_INFO_V1(g_int_picksplit);
 PG_FUNCTION_INFO_V1(g_int_union);
 PG_FUNCTION_INFO_V1(g_int_same);
 
-Datum		g_int_consistent(PG_FUNCTION_ARGS);
-Datum		g_int_compress(PG_FUNCTION_ARGS);
-Datum		g_int_decompress(PG_FUNCTION_ARGS);
-Datum		g_int_penalty(PG_FUNCTION_ARGS);
-Datum		g_int_picksplit(PG_FUNCTION_ARGS);
-Datum		g_int_union(PG_FUNCTION_ARGS);
-Datum		g_int_same(PG_FUNCTION_ARGS);
-
 
 /*
 ** The GiST Consistent method for _intments
diff --git a/contrib/intarray/_int_op.c b/contrib/intarray/_int_op.c
index 4c2aa7af8b..70849be57f 100644
--- a/contrib/intarray/_int_op.c
+++ b/contrib/intarray/_int_op.c
@@ -17,14 +17,6 @@ PG_FUNCTION_INFO_V1(_int_overlap);
 PG_FUNCTION_INFO_V1(_int_union);
 PG_FUNCTION_INFO_V1(_int_inter);
 
-Datum		_int_different(PG_FUNCTION_ARGS);
-Datum		_int_same(PG_FUNCTION_ARGS);
-Datum		_int_contains(PG_FUNCTION_ARGS);
-Datum		_int_contained(PG_FUNCTION_ARGS);
-Datum		_int_overlap(PG_FUNCTION_ARGS);
-Datum		_int_union(PG_FUNCTION_ARGS);
-Datum		_int_inter(PG_FUNCTION_ARGS);
-
 Datum
 _int_contained(PG_FUNCTION_ARGS)
 {
@@ -188,19 +180,6 @@ PG_FUNCTION_INFO_V1(intarray_push_array);
 PG_FUNCTION_INFO_V1(intarray_del_elem);
 PG_FUNCTION_INFO_V1(intset_union_elem);
 PG_FUNCTION_INFO_V1(intset_subtract);
-Datum		intset(PG_FUNCTION_ARGS);
-Datum		icount(PG_FUNCTION_ARGS);
-Datum		sort(PG_FUNCTION_ARGS);
-Datum		sort_asc(PG_FUNCTION_ARGS);
-Datum		sort_desc(PG_FUNCTION_ARGS);
-Datum		uniq(PG_FUNCTION_ARGS);
-Datum		idx(PG_FUNCTION_ARGS);
-Datum		subarray(PG_FUNCTION_ARGS);
-Datum		intarray_push_elem(PG_FUNCTION_ARGS);
-Datum		intarray_push_array(PG_FUNCTION_ARGS);
-Datum		intarray_del_elem(PG_FUNCTION_ARGS);
-Datum		intset_union_elem(PG_FUNCTION_ARGS);
-Datum		intset_subtract(PG_FUNCTION_ARGS);
 
 Datum
 intset(PG_FUNCTION_ARGS)
diff --git a/contrib/intarray/_intbig_gist.c b/contrib/intarray/_intbig_gist.c
index 1bad024c09..235db38957 100644
--- a/contrib/intarray/_intbig_gist.c
+++ b/contrib/intarray/_intbig_gist.c
@@ -20,14 +20,6 @@ PG_FUNCTION_INFO_V1(g_intbig_picksplit);
 PG_FUNCTION_INFO_V1(g_intbig_union);
 PG_FUNCTION_INFO_V1(g_intbig_same);
 
-Datum		g_intbig_consistent(PG_FUNCTION_ARGS);
-Datum		g_intbig_compress(PG_FUNCTION_ARGS);
-Datum		g_intbig_decompress(PG_FUNCTION_ARGS);
-Datum		g_intbig_penalty(PG_FUNCTION_ARGS);
-Datum		g_intbig_picksplit(PG_FUNCTION_ARGS);
-Datum		g_intbig_union(PG_FUNCTION_ARGS);
-Datum		g_intbig_same(PG_FUNCTION_ARGS);
-
 /* Number of one-bits in an unsigned byte */
 static const uint8 number_of_ones[256] = {
 	0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
@@ -49,11 +41,7 @@ static const uint8 number_of_ones[256] = {
 };
 
 PG_FUNCTION_INFO_V1(_intbig_in);
-Datum		_intbig_in(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(_intbig_out);
-Datum		_intbig_out(PG_FUNCTION_ARGS);
-
 
 Datum
 _intbig_in(PG_FUNCTION_ARGS)
diff --git a/contrib/lo/lo.c b/contrib/lo/lo.c
index 757758fe7f..4dee64724d 100644
--- a/contrib/lo/lo.c
+++ b/contrib/lo/lo.c
@@ -18,10 +18,6 @@ PG_MODULE_MAGIC;
 #define atooid(x)  ((Oid) strtoul((x), NULL, 10))
 
 
-/* forward declarations */
-Datum		lo_manage(PG_FUNCTION_ARGS);
-
-
 /*
  * This is the trigger that protects us from orphaned large objects
  */
diff --git a/contrib/ltree/_ltree_gist.c b/contrib/ltree/_ltree_gist.c
index 93507158c0..41be68d7ee 100644
--- a/contrib/ltree/_ltree_gist.c
+++ b/contrib/ltree/_ltree_gist.c
@@ -14,22 +14,11 @@
 
 
 PG_FUNCTION_INFO_V1(_ltree_compress);
-Datum		_ltree_compress(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(_ltree_same);
-Datum		_ltree_same(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(_ltree_union);
-Datum		_ltree_union(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(_ltree_penalty);
-Datum		_ltree_penalty(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(_ltree_picksplit);
-Datum		_ltree_picksplit(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(_ltree_consistent);
-Datum		_ltree_consistent(PG_FUNCTION_ARGS);
 
 #define GETENTRY(vec,pos) ((ltree_gist *) DatumGetPointer((vec)->vector[(pos)].key))
 #define NEXTVAL(x) ( (ltree*)( (char*)(x) + INTALIGN( VARSIZE(x) ) ) )
diff --git a/contrib/ltree/_ltree_op.c b/contrib/ltree/_ltree_op.c
index 1b53af816d..44270d4614 100644
--- a/contrib/ltree/_ltree_op.c
+++ b/contrib/ltree/_ltree_op.c
@@ -22,20 +22,12 @@ PG_FUNCTION_INFO_V1(_lt_q_rregex);
 PG_FUNCTION_INFO_V1(_ltxtq_exec);
 PG_FUNCTION_INFO_V1(_ltxtq_rexec);
 
-Datum		_ltree_r_isparent(PG_FUNCTION_ARGS);
-Datum		_ltree_r_risparent(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(_ltree_extract_isparent);
 PG_FUNCTION_INFO_V1(_ltree_extract_risparent);
 PG_FUNCTION_INFO_V1(_ltq_extract_regex);
 PG_FUNCTION_INFO_V1(_ltxtq_extract_exec);
-Datum		_ltree_extract_isparent(PG_FUNCTION_ARGS);
-Datum		_ltree_extract_risparent(PG_FUNCTION_ARGS);
-Datum		_ltq_extract_regex(PG_FUNCTION_ARGS);
-Datum		_ltxtq_extract_exec(PG_FUNCTION_ARGS);
 
 PG_FUNCTION_INFO_V1(_lca);
-Datum		_lca(PG_FUNCTION_ARGS);
 
 typedef Datum (*PGCALL2) (PG_FUNCTION_ARGS);
 
diff --git a/contrib/ltree/ltree_gist.c b/contrib/ltree/ltree_gist.c
index 5324c65f59..2d89f1aed4 100644
--- a/contrib/ltree/ltree_gist.c
+++ b/contrib/ltree/ltree_gist.c
@@ -13,10 +13,7 @@
 #define NEXTVAL(x) ( (lquery*)( (char*)(x) + INTALIGN( VARSIZE(x) ) ) )
 
 PG_FUNCTION_INFO_V1(ltree_gist_in);
-Datum		ltree_gist_in(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(ltree_gist_out);
-Datum		ltree_gist_out(PG_FUNCTION_ARGS);
 
 Datum
 ltree_gist_in(PG_FUNCTION_ARGS)
@@ -37,25 +34,12 @@ ltree_gist_out(PG_FUNCTION_ARGS)
 }
 
 PG_FUNCTION_INFO_V1(ltree_compress);
-Datum		ltree_compress(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(ltree_decompress);
-Datum		ltree_decompress(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(ltree_same);
-Datum		ltree_same(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(ltree_union);
-Datum		ltree_union(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(ltree_penalty);
-Datum		ltree_penalty(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(ltree_picksplit);
-Datum		ltree_picksplit(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(ltree_consistent);
-Datum		ltree_consistent(PG_FUNCTION_ARGS);
 
 #define ISEQ(a,b)	( (a)->numlevel == (b)->numlevel && ltree_compare(a,b)==0 )
 #define GETENTRY(vec,pos) ((ltree_gist *) DatumGetPointer((vec)->vector[(pos)].key))
diff --git a/contrib/ltree/ltree_io.c b/contrib/ltree/ltree_io.c
index d64debb5f4..a1d4a0d38f 100644
--- a/contrib/ltree/ltree_io.c
+++ b/contrib/ltree/ltree_io.c
@@ -12,16 +12,9 @@
 #include "crc32.h"
 
 PG_FUNCTION_INFO_V1(ltree_in);
-Datum		ltree_in(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(ltree_out);
-Datum		ltree_out(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(lquery_in);
-Datum		lquery_in(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(lquery_out);
-Datum		lquery_out(PG_FUNCTION_ARGS);
 
 
 #define UNCHAR ereport(ERROR, \
diff --git a/contrib/ltree/ltree_op.c b/contrib/ltree/ltree_op.c
index 25b6db1b1a..992106f05a 100644
--- a/contrib/ltree/ltree_op.c
+++ b/contrib/ltree/ltree_op.c
@@ -38,25 +38,6 @@ PG_FUNCTION_INFO_V1(ltree2text);
 PG_FUNCTION_INFO_V1(text2ltree);
 PG_FUNCTION_INFO_V1(ltreeparentsel);
 
-Datum		ltree_cmp(PG_FUNCTION_ARGS);
-Datum		ltree_lt(PG_FUNCTION_ARGS);
-Datum		ltree_le(PG_FUNCTION_ARGS);
-Datum		ltree_eq(PG_FUNCTION_ARGS);
-Datum		ltree_ne(PG_FUNCTION_ARGS);
-Datum		ltree_ge(PG_FUNCTION_ARGS);
-Datum		ltree_gt(PG_FUNCTION_ARGS);
-Datum		nlevel(PG_FUNCTION_ARGS);
-Datum		subltree(PG_FUNCTION_ARGS);
-Datum		subpath(PG_FUNCTION_ARGS);
-Datum		ltree_index(PG_FUNCTION_ARGS);
-Datum		ltree_addltree(PG_FUNCTION_ARGS);
-Datum		ltree_addtext(PG_FUNCTION_ARGS);
-Datum		ltree_textadd(PG_FUNCTION_ARGS);
-Datum		lca(PG_FUNCTION_ARGS);
-Datum		ltree2text(PG_FUNCTION_ARGS);
-Datum		text2ltree(PG_FUNCTION_ARGS);
-Datum		ltreeparentsel(PG_FUNCTION_ARGS);
-
 int
 ltree_compare(const ltree *a, const ltree *b)
 {
diff --git a/contrib/ltree/ltxtquery_io.c b/contrib/ltree/ltxtquery_io.c
index 982186581a..ddc63d7b66 100644
--- a/contrib/ltree/ltxtquery_io.c
+++ b/contrib/ltree/ltxtquery_io.c
@@ -12,10 +12,7 @@
 #include "miscadmin.h"
 
 PG_FUNCTION_INFO_V1(ltxtq_in);
-Datum		ltxtq_in(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(ltxtq_out);
-Datum		ltxtq_out(PG_FUNCTION_ARGS);
 
 
 /* parser's states */
diff --git a/contrib/pageinspect/btreefuncs.c b/contrib/pageinspect/btreefuncs.c
index e3f3c2818f..c1e83f301b 100644
--- a/contrib/pageinspect/btreefuncs.c
+++ b/contrib/pageinspect/btreefuncs.c
@@ -35,10 +35,6 @@
 #include "utils/rel.h"
 
 
-extern Datum bt_metap(PG_FUNCTION_ARGS);
-extern Datum bt_page_items(PG_FUNCTION_ARGS);
-extern Datum bt_page_stats(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(bt_metap);
 PG_FUNCTION_INFO_V1(bt_page_items);
 PG_FUNCTION_INFO_V1(bt_page_stats);
diff --git a/contrib/pageinspect/fsmfuncs.c b/contrib/pageinspect/fsmfuncs.c
index bdae0a58d9..8c1960445a 100644
--- a/contrib/pageinspect/fsmfuncs.c
+++ b/contrib/pageinspect/fsmfuncs.c
@@ -25,8 +25,6 @@
 #include "storage/fsm_internals.h"
 #include "utils/builtins.h"
 
-Datum		fsm_page_contents(PG_FUNCTION_ARGS);
-
 /*
  * Dumps the contents of a FSM page.
  */
diff --git a/contrib/pageinspect/heapfuncs.c b/contrib/pageinspect/heapfuncs.c
index 5e532556e1..dedc8feaeb 100644
--- a/contrib/pageinspect/heapfuncs.c
+++ b/contrib/pageinspect/heapfuncs.c
@@ -30,8 +30,6 @@
 #include "utils/builtins.h"
 #include "miscadmin.h"
 
-Datum		heap_page_items(PG_FUNCTION_ARGS);
-
 
 /*
  * bits_to_text
diff --git a/contrib/pageinspect/rawpage.c b/contrib/pageinspect/rawpage.c
index f1e0944c0e..66c88b17af 100644
--- a/contrib/pageinspect/rawpage.c
+++ b/contrib/pageinspect/rawpage.c
@@ -28,10 +28,6 @@
 
 PG_MODULE_MAGIC;
 
-Datum		get_raw_page(PG_FUNCTION_ARGS);
-Datum		get_raw_page_fork(PG_FUNCTION_ARGS);
-Datum		page_header(PG_FUNCTION_ARGS);
-
 static bytea *get_raw_page_internal(text *relname, ForkNumber forknum,
 					  BlockNumber blkno);
 
diff --git a/contrib/pg_buffercache/pg_buffercache_pages.c b/contrib/pg_buffercache/pg_buffercache_pages.c
index 1e2d192f11..f39fe255db 100644
--- a/contrib/pg_buffercache/pg_buffercache_pages.c
+++ b/contrib/pg_buffercache/pg_buffercache_pages.c
@@ -19,8 +19,6 @@
 
 PG_MODULE_MAGIC;
 
-Datum		pg_buffercache_pages(PG_FUNCTION_ARGS);
-
 
 /*
  * Record structure holding the to be exposed cache data.
diff --git a/contrib/pg_freespacemap/pg_freespacemap.c b/contrib/pg_freespacemap/pg_freespacemap.c
index f6f7d2e743..7805345add 100644
--- a/contrib/pg_freespacemap/pg_freespacemap.c
+++ b/contrib/pg_freespacemap/pg_freespacemap.c
@@ -14,8 +14,6 @@
 
 PG_MODULE_MAGIC;
 
-Datum		pg_freespace(PG_FUNCTION_ARGS);
-
 /*
  * Returns the amount of free space on a given page, according to the
  * free space map.
diff --git a/contrib/pg_prewarm/pg_prewarm.c b/contrib/pg_prewarm/pg_prewarm.c
index f7e112a5e6..d50726d109 100644
--- a/contrib/pg_prewarm/pg_prewarm.c
+++ b/contrib/pg_prewarm/pg_prewarm.c
@@ -28,8 +28,6 @@
 
 PG_MODULE_MAGIC;
 
-extern Datum pg_prewarm(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(pg_prewarm);
 
 typedef enum
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 0bd0d046c7..2ad3fb5886 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -273,10 +273,6 @@ static bool pgss_save;			/* whether to save stats across shutdown */
 void		_PG_init(void);
 void		_PG_fini(void);
 
-Datum		pg_stat_statements_reset(PG_FUNCTION_ARGS);
-Datum		pg_stat_statements_1_2(PG_FUNCTION_ARGS);
-Datum		pg_stat_statements(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(pg_stat_statements_reset);
 PG_FUNCTION_INFO_V1(pg_stat_statements_1_2);
 PG_FUNCTION_INFO_V1(pg_stat_statements);
diff --git a/contrib/pg_trgm/trgm_gin.c b/contrib/pg_trgm/trgm_gin.c
index 1fbbd9ca35..ac18c7b80f 100644
--- a/contrib/pg_trgm/trgm_gin.c
+++ b/contrib/pg_trgm/trgm_gin.c
@@ -10,16 +10,9 @@
 
 
 PG_FUNCTION_INFO_V1(gin_extract_trgm);
-Datum		gin_extract_trgm(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(gin_extract_value_trgm);
-Datum		gin_extract_value_trgm(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(gin_extract_query_trgm);
-Datum		gin_extract_query_trgm(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(gin_trgm_consistent);
-Datum		gin_trgm_consistent(PG_FUNCTION_ARGS);
 
 /*
  * This function can only be called if a pre-9.1 version of the GIN operator
diff --git a/contrib/pg_trgm/trgm_gist.c b/contrib/pg_trgm/trgm_gist.c
index c572d0f90f..ede969f424 100644
--- a/contrib/pg_trgm/trgm_gist.c
+++ b/contrib/pg_trgm/trgm_gist.c
@@ -28,34 +28,15 @@ typedef struct
 
 
 PG_FUNCTION_INFO_V1(gtrgm_in);
-Datum		gtrgm_in(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(gtrgm_out);
-Datum		gtrgm_out(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(gtrgm_compress);
-Datum		gtrgm_compress(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(gtrgm_decompress);
-Datum		gtrgm_decompress(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(gtrgm_consistent);
-Datum		gtrgm_consistent(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(gtrgm_distance);
-Datum		gtrgm_distance(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(gtrgm_union);
-Datum		gtrgm_union(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(gtrgm_same);
-Datum		gtrgm_same(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(gtrgm_penalty);
-Datum		gtrgm_penalty(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(gtrgm_picksplit);
-Datum		gtrgm_picksplit(PG_FUNCTION_ARGS);
 
 /* Number of one-bits in an unsigned byte */
 static const uint8 number_of_ones[256] = {
diff --git a/contrib/pg_trgm/trgm_op.c b/contrib/pg_trgm/trgm_op.c
index dadbeea94d..c385e09edd 100644
--- a/contrib/pg_trgm/trgm_op.c
+++ b/contrib/pg_trgm/trgm_op.c
@@ -17,22 +17,11 @@ PG_MODULE_MAGIC;
 float4		trgm_limit = 0.3f;
 
 PG_FUNCTION_INFO_V1(set_limit);
-Datum		set_limit(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(show_limit);
-Datum		show_limit(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(show_trgm);
-Datum		show_trgm(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(similarity);
-Datum		similarity(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(similarity_dist);
-Datum		similarity_dist(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(similarity_op);
-Datum		similarity_op(PG_FUNCTION_ARGS);
 
 
 Datum
diff --git a/contrib/pg_upgrade_support/pg_upgrade_support.c b/contrib/pg_upgrade_support/pg_upgrade_support.c
index 77a2c1f638..edd41d06ae 100644
--- a/contrib/pg_upgrade_support/pg_upgrade_support.c
+++ b/contrib/pg_upgrade_support/pg_upgrade_support.c
@@ -25,19 +25,6 @@
 PG_MODULE_MAGIC;
 #endif
 
-Datum		set_next_pg_type_oid(PG_FUNCTION_ARGS);
-Datum		set_next_array_pg_type_oid(PG_FUNCTION_ARGS);
-Datum		set_next_toast_pg_type_oid(PG_FUNCTION_ARGS);
-
-Datum		set_next_heap_pg_class_oid(PG_FUNCTION_ARGS);
-Datum		set_next_index_pg_class_oid(PG_FUNCTION_ARGS);
-Datum		set_next_toast_pg_class_oid(PG_FUNCTION_ARGS);
-
-Datum		set_next_pg_enum_oid(PG_FUNCTION_ARGS);
-Datum		set_next_pg_authid_oid(PG_FUNCTION_ARGS);
-
-Datum		create_empty_extension(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(set_next_pg_type_oid);
 PG_FUNCTION_INFO_V1(set_next_array_pg_type_oid);
 PG_FUNCTION_INFO_V1(set_next_toast_pg_type_oid);
diff --git a/contrib/pgcrypto/pgp-pgsql.c b/contrib/pgcrypto/pgp-pgsql.c
index 828f64a84b..fff59de2c8 100644
--- a/contrib/pgcrypto/pgp-pgsql.c
+++ b/contrib/pgcrypto/pgp-pgsql.c
@@ -41,23 +41,6 @@
 /*
  * public functions
  */
-Datum		pgp_sym_encrypt_text(PG_FUNCTION_ARGS);
-Datum		pgp_sym_encrypt_bytea(PG_FUNCTION_ARGS);
-Datum		pgp_sym_decrypt_text(PG_FUNCTION_ARGS);
-Datum		pgp_sym_decrypt_bytea(PG_FUNCTION_ARGS);
-
-Datum		pgp_pub_encrypt_text(PG_FUNCTION_ARGS);
-Datum		pgp_pub_encrypt_bytea(PG_FUNCTION_ARGS);
-Datum		pgp_pub_decrypt_text(PG_FUNCTION_ARGS);
-Datum		pgp_pub_decrypt_bytea(PG_FUNCTION_ARGS);
-
-Datum		pgp_key_id_w(PG_FUNCTION_ARGS);
-
-Datum		pg_armor(PG_FUNCTION_ARGS);
-Datum		pg_dearmor(PG_FUNCTION_ARGS);
-
-/* function headers */
-
 PG_FUNCTION_INFO_V1(pgp_sym_encrypt_bytea);
 PG_FUNCTION_INFO_V1(pgp_sym_encrypt_text);
 PG_FUNCTION_INFO_V1(pgp_sym_decrypt_bytea);
diff --git a/contrib/pgrowlocks/pgrowlocks.c b/contrib/pgrowlocks/pgrowlocks.c
index 636ff05670..15d9704752 100644
--- a/contrib/pgrowlocks/pgrowlocks.c
+++ b/contrib/pgrowlocks/pgrowlocks.c
@@ -43,8 +43,6 @@ PG_MODULE_MAGIC;
 
 PG_FUNCTION_INFO_V1(pgrowlocks);
 
-extern Datum pgrowlocks(PG_FUNCTION_ARGS);
-
 /* ----------
  * pgrowlocks:
  * returns tids of rows being locked
diff --git a/contrib/pgstattuple/pgstatindex.c b/contrib/pgstattuple/pgstatindex.c
index 8939b784db..f617d99d4d 100644
--- a/contrib/pgstattuple/pgstatindex.c
+++ b/contrib/pgstattuple/pgstatindex.c
@@ -47,12 +47,6 @@
  * Those functions which have text-type input arg will be deprecated
  * in the future release.
  */
-extern Datum pgstatindex(PG_FUNCTION_ARGS);
-extern Datum pgstatindexbyid(PG_FUNCTION_ARGS);
-extern Datum pg_relpages(PG_FUNCTION_ARGS);
-extern Datum pg_relpagesbyid(PG_FUNCTION_ARGS);
-extern Datum pgstatginindex(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(pgstatindex);
 PG_FUNCTION_INFO_V1(pgstatindexbyid);
 PG_FUNCTION_INFO_V1(pg_relpages);
diff --git a/contrib/pgstattuple/pgstattuple.c b/contrib/pgstattuple/pgstattuple.c
index f9ba0a6c21..16b437babe 100644
--- a/contrib/pgstattuple/pgstattuple.c
+++ b/contrib/pgstattuple/pgstattuple.c
@@ -42,9 +42,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(pgstattuple);
 PG_FUNCTION_INFO_V1(pgstattuplebyid);
 
-extern Datum pgstattuple(PG_FUNCTION_ARGS);
-extern Datum pgstattuplebyid(PG_FUNCTION_ARGS);
-
 /*
  * struct pgstattuple_type
  *
diff --git a/contrib/postgres_fdw/option.c b/contrib/postgres_fdw/option.c
index 8ba2be5ca6..6f98dfcb23 100644
--- a/contrib/postgres_fdw/option.c
+++ b/contrib/postgres_fdw/option.c
@@ -57,8 +57,6 @@ static bool is_libpq_option(const char *keyword);
  *
  * Raise an ERROR if the option or its value is considered invalid.
  */
-extern Datum postgres_fdw_validator(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(postgres_fdw_validator);
 
 Datum
diff --git a/contrib/postgres_fdw/postgres_fdw.c b/contrib/postgres_fdw/postgres_fdw.c
index d7c5fa2119..040e5867bf 100644
--- a/contrib/postgres_fdw/postgres_fdw.c
+++ b/contrib/postgres_fdw/postgres_fdw.c
@@ -228,8 +228,6 @@ typedef struct
 /*
  * SQL functions
  */
-extern Datum postgres_fdw_handler(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(postgres_fdw_handler);
 
 /*
diff --git a/contrib/seg/seg.c b/contrib/seg/seg.c
index 0cf9853060..0807e238f1 100644
--- a/contrib/seg/seg.c
+++ b/contrib/seg/seg.c
@@ -52,13 +52,6 @@ PG_FUNCTION_INFO_V1(seg_lower);
 PG_FUNCTION_INFO_V1(seg_upper);
 PG_FUNCTION_INFO_V1(seg_center);
 
-Datum		seg_in(PG_FUNCTION_ARGS);
-Datum		seg_out(PG_FUNCTION_ARGS);
-Datum		seg_size(PG_FUNCTION_ARGS);
-Datum		seg_lower(PG_FUNCTION_ARGS);
-Datum		seg_upper(PG_FUNCTION_ARGS);
-Datum		seg_center(PG_FUNCTION_ARGS);
-
 /*
 ** GiST support methods
 */
diff --git a/contrib/spi/autoinc.c b/contrib/spi/autoinc.c
index 54bbc4345c..41eae4fdc4 100644
--- a/contrib/spi/autoinc.c
+++ b/contrib/spi/autoinc.c
@@ -12,8 +12,6 @@
 
 PG_MODULE_MAGIC;
 
-extern Datum autoinc(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(autoinc);
 
 Datum
diff --git a/contrib/spi/insert_username.c b/contrib/spi/insert_username.c
index 3bc51c7f02..875207881a 100644
--- a/contrib/spi/insert_username.c
+++ b/contrib/spi/insert_username.c
@@ -17,8 +17,6 @@
 
 PG_MODULE_MAGIC;
 
-extern Datum insert_username(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(insert_username);
 
 Datum
diff --git a/contrib/spi/moddatetime.c b/contrib/spi/moddatetime.c
index 2ec9654036..c6d33b7355 100644
--- a/contrib/spi/moddatetime.c
+++ b/contrib/spi/moddatetime.c
@@ -23,8 +23,6 @@ OH, me, I'm Terry Mackintosh <terry@terrym.com>
 
 PG_MODULE_MAGIC;
 
-extern Datum moddatetime(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(moddatetime);
 
 Datum
diff --git a/contrib/spi/refint.c b/contrib/spi/refint.c
index fbed300396..2602210741 100644
--- a/contrib/spi/refint.c
+++ b/contrib/spi/refint.c
@@ -16,10 +16,6 @@
 
 PG_MODULE_MAGIC;
 
-extern Datum check_primary_key(PG_FUNCTION_ARGS);
-extern Datum check_foreign_key(PG_FUNCTION_ARGS);
-
-
 typedef struct
 {
 	char	   *ident;
diff --git a/contrib/spi/timetravel.c b/contrib/spi/timetravel.c
index fa74daba94..a97eaa148f 100644
--- a/contrib/spi/timetravel.c
+++ b/contrib/spi/timetravel.c
@@ -22,9 +22,6 @@
 PG_MODULE_MAGIC;
 
 /* AbsoluteTime currabstime(void); */
-Datum		timetravel(PG_FUNCTION_ARGS);
-Datum		set_timetravel(PG_FUNCTION_ARGS);
-Datum		get_timetravel(PG_FUNCTION_ARGS);
 
 typedef struct
 {
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 90c6b57c69..ac691574b4 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -22,16 +22,6 @@
 PG_MODULE_MAGIC;
 
 
-Datum		ssl_is_used(PG_FUNCTION_ARGS);
-Datum		ssl_version(PG_FUNCTION_ARGS);
-Datum		ssl_cipher(PG_FUNCTION_ARGS);
-Datum		ssl_client_cert_present(PG_FUNCTION_ARGS);
-Datum		ssl_client_serial(PG_FUNCTION_ARGS);
-Datum		ssl_client_dn_field(PG_FUNCTION_ARGS);
-Datum		ssl_issuer_field(PG_FUNCTION_ARGS);
-Datum		ssl_client_dn(PG_FUNCTION_ARGS);
-Datum		ssl_issuer_dn(PG_FUNCTION_ARGS);
-
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
 static Datum X509_NAME_to_text(X509_NAME *name);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
diff --git a/contrib/tcn/tcn.c b/contrib/tcn/tcn.c
index 701ae824ae..b4720969d1 100644
--- a/contrib/tcn/tcn.c
+++ b/contrib/tcn/tcn.c
@@ -27,10 +27,6 @@
 PG_MODULE_MAGIC;
 
 
-/* forward declarations */
-Datum		triggered_change_notification(PG_FUNCTION_ARGS);
-
-
 /*
  * Copy from s (for source) to r (for result), wrapping with q (quote)
  * characters and doubling any quote characters found.
diff --git a/contrib/test_parser/test_parser.c b/contrib/test_parser/test_parser.c
index 932d9248a3..c41d1eb201 100644
--- a/contrib/test_parser/test_parser.c
+++ b/contrib/test_parser/test_parser.c
@@ -37,24 +37,14 @@ typedef struct
 	char	   *descr;
 } LexDescr;
 
-/*
- * prototypes
- */
-PG_FUNCTION_INFO_V1(testprs_start);
-Datum		testprs_start(PG_FUNCTION_ARGS);
-
-PG_FUNCTION_INFO_V1(testprs_getlexeme);
-Datum		testprs_getlexeme(PG_FUNCTION_ARGS);
-
-PG_FUNCTION_INFO_V1(testprs_end);
-Datum		testprs_end(PG_FUNCTION_ARGS);
-
-PG_FUNCTION_INFO_V1(testprs_lextype);
-Datum		testprs_lextype(PG_FUNCTION_ARGS);
-
 /*
  * functions
  */
+PG_FUNCTION_INFO_V1(testprs_start);
+PG_FUNCTION_INFO_V1(testprs_getlexeme);
+PG_FUNCTION_INFO_V1(testprs_end);
+PG_FUNCTION_INFO_V1(testprs_lextype);
+
 Datum
 testprs_start(PG_FUNCTION_ARGS)
 {
diff --git a/contrib/test_shm_mq/test.c b/contrib/test_shm_mq/test.c
index 5ff1e9a63f..1832e1d1db 100644
--- a/contrib/test_shm_mq/test.c
+++ b/contrib/test_shm_mq/test.c
@@ -23,8 +23,6 @@ PG_FUNCTION_INFO_V1(test_shm_mq);
 PG_FUNCTION_INFO_V1(test_shm_mq_pipelined);
 
 void		_PG_init(void);
-Datum		test_shm_mq(PG_FUNCTION_ARGS);
-Datum		test_shm_mq_pipelined(PG_FUNCTION_ARGS);
 
 static void verify_message(Size origlen, char *origdata, Size newlen,
 			   char *newdata);
diff --git a/contrib/tsearch2/tsearch2.c b/contrib/tsearch2/tsearch2.c
index e508b43bc4..bd30d87515 100644
--- a/contrib/tsearch2/tsearch2.c
+++ b/contrib/tsearch2/tsearch2.c
@@ -45,7 +45,7 @@ static Oid	current_parser_oid = InvalidOid;
 					 CStringGetDatum(text_to_cstring(text))))
 
 #define UNSUPPORTED_FUNCTION(name)						\
-	Datum name(PG_FUNCTION_ARGS);						\
+	PG_FUNCTION_INFO_V1(name);							\
 	Datum												\
 	name(PG_FUNCTION_ARGS)								\
 	{													\
@@ -57,30 +57,11 @@ static Oid	current_parser_oid = InvalidOid;
 		/* keep compiler quiet */						\
 		PG_RETURN_NULL();								\
 	}													\
-	PG_FUNCTION_INFO_V1(name)
+	extern int no_such_variable
 
 static Oid	GetCurrentDict(void);
 static Oid	GetCurrentParser(void);
 
-Datum		tsa_lexize_byname(PG_FUNCTION_ARGS);
-Datum		tsa_lexize_bycurrent(PG_FUNCTION_ARGS);
-Datum		tsa_set_curdict(PG_FUNCTION_ARGS);
-Datum		tsa_set_curdict_byname(PG_FUNCTION_ARGS);
-Datum		tsa_token_type_current(PG_FUNCTION_ARGS);
-Datum		tsa_set_curprs(PG_FUNCTION_ARGS);
-Datum		tsa_set_curprs_byname(PG_FUNCTION_ARGS);
-Datum		tsa_parse_current(PG_FUNCTION_ARGS);
-Datum		tsa_set_curcfg(PG_FUNCTION_ARGS);
-Datum		tsa_set_curcfg_byname(PG_FUNCTION_ARGS);
-Datum		tsa_to_tsvector_name(PG_FUNCTION_ARGS);
-Datum		tsa_to_tsquery_name(PG_FUNCTION_ARGS);
-Datum		tsa_plainto_tsquery_name(PG_FUNCTION_ARGS);
-Datum		tsa_headline_byname(PG_FUNCTION_ARGS);
-Datum		tsa_ts_stat(PG_FUNCTION_ARGS);
-Datum		tsa_tsearch2(PG_FUNCTION_ARGS);
-Datum		tsa_rewrite_accum(PG_FUNCTION_ARGS);
-Datum		tsa_rewrite_finish(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(tsa_lexize_byname);
 PG_FUNCTION_INFO_V1(tsa_lexize_bycurrent);
 PG_FUNCTION_INFO_V1(tsa_set_curdict);
diff --git a/contrib/unaccent/unaccent.c b/contrib/unaccent/unaccent.c
index 10cc1e36f1..a337df61af 100644
--- a/contrib/unaccent/unaccent.c
+++ b/contrib/unaccent/unaccent.c
@@ -216,7 +216,6 @@ findReplaceTo(TrieChar *node, unsigned char *src, int srclen)
 }
 
 PG_FUNCTION_INFO_V1(unaccent_init);
-Datum		unaccent_init(PG_FUNCTION_ARGS);
 Datum
 unaccent_init(PG_FUNCTION_ARGS)
 {
@@ -258,7 +257,6 @@ unaccent_init(PG_FUNCTION_ARGS)
 }
 
 PG_FUNCTION_INFO_V1(unaccent_lexize);
-Datum		unaccent_lexize(PG_FUNCTION_ARGS);
 Datum
 unaccent_lexize(PG_FUNCTION_ARGS)
 {
@@ -313,7 +311,6 @@ unaccent_lexize(PG_FUNCTION_ARGS)
  * Function-like wrapper for dictionary
  */
 PG_FUNCTION_INFO_V1(unaccent_dict);
-Datum		unaccent_dict(PG_FUNCTION_ARGS);
 Datum
 unaccent_dict(PG_FUNCTION_ARGS)
 {
diff --git a/contrib/uuid-ossp/uuid-ossp.c b/contrib/uuid-ossp/uuid-ossp.c
index 8e80c24f1b..8f99084df3 100644
--- a/contrib/uuid-ossp/uuid-ossp.c
+++ b/contrib/uuid-ossp/uuid-ossp.c
@@ -39,19 +39,6 @@
 PG_MODULE_MAGIC;
 
 
-Datum		uuid_nil(PG_FUNCTION_ARGS);
-Datum		uuid_ns_dns(PG_FUNCTION_ARGS);
-Datum		uuid_ns_url(PG_FUNCTION_ARGS);
-Datum		uuid_ns_oid(PG_FUNCTION_ARGS);
-Datum		uuid_ns_x500(PG_FUNCTION_ARGS);
-
-Datum		uuid_generate_v1(PG_FUNCTION_ARGS);
-Datum		uuid_generate_v1mc(PG_FUNCTION_ARGS);
-Datum		uuid_generate_v3(PG_FUNCTION_ARGS);
-Datum		uuid_generate_v4(PG_FUNCTION_ARGS);
-Datum		uuid_generate_v5(PG_FUNCTION_ARGS);
-
-
 PG_FUNCTION_INFO_V1(uuid_nil);
 PG_FUNCTION_INFO_V1(uuid_ns_dns);
 PG_FUNCTION_INFO_V1(uuid_ns_url);
diff --git a/contrib/worker_spi/worker_spi.c b/contrib/worker_spi/worker_spi.c
index 560be21814..a01385354f 100644
--- a/contrib/worker_spi/worker_spi.c
+++ b/contrib/worker_spi/worker_spi.c
@@ -47,7 +47,6 @@ PG_FUNCTION_INFO_V1(worker_spi_launch);
 
 void		_PG_init(void);
 void		worker_spi_main(Datum);
-Datum		worker_spi_launch(PG_FUNCTION_ARGS);
 
 /* flags set by signal handlers */
 static volatile sig_atomic_t got_sighup = false;
diff --git a/contrib/xml2/xpath.c b/contrib/xml2/xpath.c
index 41cb98d139..156ed2f493 100644
--- a/contrib/xml2/xpath.c
+++ b/contrib/xml2/xpath.c
@@ -26,17 +26,6 @@
 
 PG_MODULE_MAGIC;
 
-/* externally accessible functions */
-
-Datum		xml_is_well_formed(PG_FUNCTION_ARGS);
-Datum		xml_encode_special_chars(PG_FUNCTION_ARGS);
-Datum		xpath_nodeset(PG_FUNCTION_ARGS);
-Datum		xpath_string(PG_FUNCTION_ARGS);
-Datum		xpath_number(PG_FUNCTION_ARGS);
-Datum		xpath_bool(PG_FUNCTION_ARGS);
-Datum		xpath_list(PG_FUNCTION_ARGS);
-Datum		xpath_table(PG_FUNCTION_ARGS);
-
 /* exported for use by xslt_proc.c */
 
 PgXmlErrorContext *pgxml_parser_init(PgXmlStrictness strictness);
diff --git a/contrib/xml2/xslt_proc.c b/contrib/xml2/xslt_proc.c
index 2f24b39bcc..9f13787332 100644
--- a/contrib/xml2/xslt_proc.c
+++ b/contrib/xml2/xslt_proc.c
@@ -32,10 +32,6 @@
 #endif   /* USE_LIBXSLT */
 
 
-/* externally accessible functions */
-
-Datum		xslt_process(PG_FUNCTION_ARGS);
-
 #ifdef USE_LIBXSLT
 
 /* declarations to come from xpath.c */
diff --git a/src/include/fmgr.h b/src/include/fmgr.h
index aed81cdc26..494c768826 100644
--- a/src/include/fmgr.h
+++ b/src/include/fmgr.h
@@ -348,6 +348,7 @@ typedef const Pg_finfo_record *(*PGFInfoFunction) (void);
  *	doesn't hurt to add PGDLLIMPORT in case they don't.
  */
 #define PG_FUNCTION_INFO_V1(funcname) \
+Datum funcname(PG_FUNCTION_ARGS); \
 extern PGDLLEXPORT const Pg_finfo_record * CppConcat(pg_finfo_,funcname)(void); \
 const Pg_finfo_record * \
 CppConcat(pg_finfo_,funcname) (void) \
diff --git a/src/pl/plperl/plperl.c b/src/pl/plperl/plperl.c
index 5fff63558f..ffdf634f55 100644
--- a/src/pl/plperl/plperl.c
+++ b/src/pl/plperl/plperl.c
@@ -240,12 +240,6 @@ static plperl_call_data *current_call_data = NULL;
 /**********************************************************************
  * Forward declarations
  **********************************************************************/
-Datum		plperl_call_handler(PG_FUNCTION_ARGS);
-Datum		plperl_inline_handler(PG_FUNCTION_ARGS);
-Datum		plperl_validator(PG_FUNCTION_ARGS);
-Datum		plperlu_call_handler(PG_FUNCTION_ARGS);
-Datum		plperlu_inline_handler(PG_FUNCTION_ARGS);
-Datum		plperlu_validator(PG_FUNCTION_ARGS);
 void		_PG_init(void);
 
 static PerlInterpreter *plperl_init_interp(void);
diff --git a/src/pl/plpgsql/src/plpgsql.h b/src/pl/plpgsql/src/plpgsql.h
index 41fc9407a2..b4d1498e43 100644
--- a/src/pl/plpgsql/src/plpgsql.h
+++ b/src/pl/plpgsql/src/plpgsql.h
@@ -950,9 +950,6 @@ extern void plpgsql_HashTableInit(void);
  * ----------
  */
 extern void _PG_init(void);
-extern Datum plpgsql_call_handler(PG_FUNCTION_ARGS);
-extern Datum plpgsql_inline_handler(PG_FUNCTION_ARGS);
-extern Datum plpgsql_validator(PG_FUNCTION_ARGS);
 
 /* ----------
  * Functions in pl_exec.c
diff --git a/src/pl/plpython/plpy_main.c b/src/pl/plpython/plpy_main.c
index 4438721589..5f03efa4fb 100644
--- a/src/pl/plpython/plpy_main.c
+++ b/src/pl/plpython/plpy_main.c
@@ -40,16 +40,6 @@
 #endif
 
 extern void _PG_init(void);
-extern Datum plpython_validator(PG_FUNCTION_ARGS);
-extern Datum plpython_call_handler(PG_FUNCTION_ARGS);
-extern Datum plpython_inline_handler(PG_FUNCTION_ARGS);
-
-#if PY_MAJOR_VERSION < 3
-/* Define aliases plpython2_call_handler etc */
-extern Datum plpython2_validator(PG_FUNCTION_ARGS);
-extern Datum plpython2_call_handler(PG_FUNCTION_ARGS);
-extern Datum plpython2_inline_handler(PG_FUNCTION_ARGS);
-#endif
 
 PG_MODULE_MAGIC;
 
@@ -58,6 +48,7 @@ PG_FUNCTION_INFO_V1(plpython_call_handler);
 PG_FUNCTION_INFO_V1(plpython_inline_handler);
 
 #if PY_MAJOR_VERSION < 3
+/* Define aliases plpython2_call_handler etc */
 PG_FUNCTION_INFO_V1(plpython2_validator);
 PG_FUNCTION_INFO_V1(plpython2_call_handler);
 PG_FUNCTION_INFO_V1(plpython2_inline_handler);
diff --git a/src/pl/tcl/pltcl.c b/src/pl/tcl/pltcl.c
index 2d862a6b05..8c18d5ea20 100644
--- a/src/pl/tcl/pltcl.c
+++ b/src/pl/tcl/pltcl.c
@@ -192,8 +192,6 @@ static pltcl_proc_desc *pltcl_current_prodesc = NULL;
 /**********************************************************************
  * Forward declarations
  **********************************************************************/
-Datum		pltcl_call_handler(PG_FUNCTION_ARGS);
-Datum		pltclu_call_handler(PG_FUNCTION_ARGS);
 void		_PG_init(void);
 
 static void pltcl_init_interp(pltcl_interp_desc *interp_desc, bool pltrusted);
diff --git a/src/test/regress/regress.c b/src/test/regress/regress.c
index 4dbe314557..c25bf6e09d 100644
--- a/src/test/regress/regress.c
+++ b/src/test/regress/regress.c
@@ -28,18 +28,10 @@
 #define RDELIM			')'
 #define DELIM			','
 
-extern Datum regress_dist_ptpath(PG_FUNCTION_ARGS);
-extern Datum regress_path_dist(PG_FUNCTION_ARGS);
 extern PATH *poly2path(POLYGON *poly);
-extern Datum interpt_pp(PG_FUNCTION_ARGS);
 extern void regress_lseg_construct(LSEG *lseg, Point *pt1, Point *pt2);
-extern Datum overpaid(PG_FUNCTION_ARGS);
-extern Datum boxarea(PG_FUNCTION_ARGS);
 extern char *reverse_name(char *string);
 extern int	oldstyle_length(int n, text *t);
-extern Datum int44in(PG_FUNCTION_ARGS);
-extern Datum int44out(PG_FUNCTION_ARGS);
-extern Datum make_tuple_indirect(PG_FUNCTION_ARGS);
 
 #ifdef PG_MODULE_MAGIC
 PG_MODULE_MAGIC;
@@ -236,7 +228,6 @@ typedef struct
 
 WIDGET	   *widget_in(char *str);
 char	   *widget_out(WIDGET * widget);
-extern Datum pt_in_widget(PG_FUNCTION_ARGS);
 
 #define NARGS	3
 
@@ -341,7 +332,6 @@ static int	fd17b_level = 0;
 static int	fd17a_level = 0;
 static bool fd17b_recursion = true;
 static bool fd17a_recursion = true;
-extern Datum funny_dup17(PG_FUNCTION_ARGS);
 
 PG_FUNCTION_INFO_V1(funny_dup17);
 
@@ -453,9 +443,6 @@ funny_dup17(PG_FUNCTION_ARGS)
 	return PointerGetDatum(tuple);
 }
 
-extern Datum ttdummy(PG_FUNCTION_ARGS);
-extern Datum set_ttdummy(PG_FUNCTION_ARGS);
-
 #define TTDUMMY_INFINITY	999999
 
 static SPIPlanPtr splan = NULL;