Install kludges to fix check-world for src/test/modules

check-world failed in a completely clean tree, because src/test/modules
fail to build unless errcodes.h is generated first.  To fix this,
install a dependency in src/test/modules' Makefile so that the necessary
file is generated.  Even with this, running "make check" within
individual module subdirs will still fail because the dependency is not
considered there, but this case is less interesting and would be messier
to fix.

check-world still failed with the above fix in place, this time because
dummy_seclabel used LOAD to load the dynamic library, which doesn't work
because the @libdir@ (expanded by the makefile) is expanded to the final
install path, not the temporary installation directory used by make
check.  To fix, tweak things so that CREATE EXTENSION can be used
instead, which solves the problem because the library path is expanded
by the backend, which is aware of the true libdir.

src/test/modules/Makefile

@@ -10,4 +10,9 @@ SUBDIRS = \
 		  test_shm_mq \
 		  test_parser
 
+all: submake-errcodes
+
+submake-errcodes:
+	$(MAKE) -C $(top_builddir)/src/backend submake-errcodes
+
 $(recurse)

src/test/modules/dummy_seclabel/Makefile

@@ -3,6 +3,9 @@
 MODULES = dummy_seclabel
 PGFILEDESC = "dummy_seclabel - regression testing of the SECURITY LABEL statement"
 
+EXTENSION = dummy_seclabel
+DATA = dummy_seclabel--1.0.sql
+
 REGRESS = dummy_seclabel
 EXTRA_CLEAN = sql/dummy_seclabel.sql expected/dummy_seclabel.out
 

src/test/modules/dummy_seclabel/dummy_seclabel--1.0.sql

@@ -0,0 +1,9 @@
+/* src/test/modules/dummy_seclabel/dummy_seclabel--1.0.sql */
+
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION dummy_seclabel" to load this file. \quit
+
+CREATE FUNCTION dummy_seclabel_dummy()
+   RETURNS pg_catalog.void
+       AS 'MODULE_PATHNAME' LANGUAGE C;
+

src/test/modules/dummy_seclabel/dummy_seclabel.c

@@ -21,6 +21,8 @@ PG_MODULE_MAGIC;
 /* Entrypoint of the module */
 void		_PG_init(void);
 
+PG_FUNCTION_INFO_V1(dummy_seclabel_dummy);
+
 static void
 dummy_object_relabel(const ObjectAddress *object, const char *seclabel)
 {
@@ -48,3 +50,13 @@ _PG_init(void)
 {
 	register_label_provider("dummy", dummy_object_relabel);
 }
+
+/*
+ * This function is here just so that the extension is not completely empty
+ * and the dynamic library is loaded when CREATE EXTENSION runs.
+ */
+Datum
+dummy_seclabel_dummy(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_VOID();
+}

src/test/modules/dummy_seclabel/dummy_seclabel.control

@@ -0,0 +1,4 @@
+comment = 'Test code for SECURITY LABEL feature'
+default_version = '1.0'
+module_pathname = '$libdir/dummy_seclabel'
+relocatable = true

src/test/modules/dummy_seclabel/expected/.gitignore

@@ -1 +0,0 @@
-/dummy_seclabel.out

src/test/modules/dummy_seclabel/expected/dummy_seclabel.out

@@ -1,7 +1,7 @@
 --
 -- Test for facilities of security label
 --
-LOAD '@libdir@/dummy_seclabel@DLSUFFIX@';
+CREATE EXTENSION dummy_seclabel;
 -- initial setups
 SET client_min_messages TO 'warning';
 DROP ROLE IF EXISTS dummy_seclabel_user1;

src/test/modules/dummy_seclabel/sql/.gitignore

@@ -1 +0,0 @@
-/dummy_seclabel.sql

src/test/modules/dummy_seclabel/sql/dummy_seclabel.sql

@@ -1,7 +1,7 @@
 --
 -- Test for facilities of security label
 --
-LOAD '@libdir@/dummy_seclabel@DLSUFFIX@';
+CREATE EXTENSION dummy_seclabel;
 
 -- initial setups
 SET client_min_messages TO 'warning';