postgresql/config/general.m4

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# $PostgreSQL: pgsql/config/general.m4,v 1.4 2006/05/30 13:52:25 momjian Exp $
# This file defines new macros to process configure command line
# arguments, to replace the brain-dead AC_ARG_WITH and AC_ARG_ENABLE.
# The flaw in these is particularly that they only differentiate
# between "given" and "not given" and do not provide enough help to
# process arguments that only accept "yes/no", that require an
# argument (other than "yes/no"), etc.
#
# The point of this implementation is to reduce code size and
# redundancy in configure.in and to improve robustness and consistency
# in the option evaluation code.
# Convert type and name to shell variable name (e.g., "enable_long_strings")
m4_define([pgac_arg_to_variable],
[$1[]_[]patsubst($2, -, _)])
# This is the divert which we store all declared 'with' and 'enable'
# arguments for use with PGAC_CHECK_ARGS
m4_define([_m4_divert(PGAC_ARGS)], 5432)
# PGAC_ARG(TYPE, NAME, HELP-STRING,
# [ACTION-IF-YES], [ACTION-IF-NO], [ACTION-IF-ARG],
# [ACTION-IF-OMITTED])
# ----------------------------------------------------------
# This is the base layer. TYPE is either "with" or "enable", depending
# on what you like. NAME is the rest of the option name, HELP-STRING
# as usual. ACTION-IF-YES is executed if the option is given without
# and argument (or "yes", which is the same); similar for ACTION-IF-NO.
AC_DEFUN([PGAC_ARG],
[
m4_divert_text([PGAC_ARGS],[pgac_arg_to_variable([$1],[$2])) ;;])
m4_case([$1],
enable, [
AC_ARG_ENABLE([$2], [$3], [
case [$]enableval in
yes)
m4_default([$4], :)
;;
no)
m4_default([$5], :)
;;
*)
$6
;;
esac
],
[$7])[]dnl AC_ARG_ENABLE
],
with, [
AC_ARG_WITH([$2], [$3], [
case [$]withval in
yes)
m4_default([$4], :)
;;
no)
m4_default([$5], :)
;;
*)
$6
;;
esac
],
[$7])[]dnl AC_ARG_WITH
],
[m4_fatal([first argument of $0 must be 'enable' or 'with', not '$1'])]
)
])# PGAC_ARG
# PGAC_CHECK_ARGS()
# -----------------
# Checks if the user passed any --with/without/enable/disable arguments that
# we don't recognise. Just prints out a warning message, so this should be
# called near the end, so the user will see it.
AC_DEFUN([PGAC_CHECK_ARGS],
[
for var in `set |sed -ne '/^\(with_\|enable\_\)/ s/=.*//p'` ; do
case $var in
m4_undivert([PGAC_ARGS])
with_gnu_ld) ;;
*)
echo -n "*** Option ignored: "
echo $var | sed -e 's/\([^=]*\)/--\1/;s/_/-/g'
;;
esac
done
])# PGAC_CHECK_ARGS
# PGAC_ARG_BOOL(TYPE, NAME, DEFAULT, HELP-STRING,
# [ACTION-IF-YES], [ACTION-IF-NO])
# -----------------------------------------------
# Accept a boolean option, that is, one that only takes yes or no.
# ("no" is equivalent to "disable" or "without"). DEFAULT is what
# should be done if the option is omitted; it should be "yes" or "no".
# (Consequently, one of ACTION-IF-YES and ACTION-IF-NO will always
# execute.)
AC_DEFUN([PGAC_ARG_BOOL],
[PGAC_ARG([$1], [$2], [$4], [$5], [$6],
[AC_MSG_ERROR([no argument expected for --$1-$2 option])],
[m4_case([$3],
yes, [pgac_arg_to_variable([$1], [$2])=yes
$5],
no, [pgac_arg_to_variable([$1], [$2])=no
$6],
[m4_fatal([third argument of $0 must be 'yes' or 'no', not '$3'])])])[]dnl
])# PGAC_ARG_BOOL
# PGAC_ARG_REQ(TYPE, NAME, HELP-STRING, [ACTION-IF-GIVEN], [ACTION-IF-NOT-GIVEN])
# -------------------------------------------------------------------------------
# This option will require an argument; "yes" or "no" will not be
# accepted.
AC_DEFUN([PGAC_ARG_REQ],
[PGAC_ARG([$1], [$2], [$3],
[AC_MSG_ERROR([argument required for --$1-$2 option])],
[AC_MSG_ERROR([argument required for --$1-$2 option])],
[$4],
[$5])])# PGAC_ARG_REQ
# PGAC_ARG_OPTARG(TYPE, NAME, HELP-STRING, [DEFAULT-ACTION], [ARG-ACTION]
# [ACTION-ENABLED], [ACTION-DISABLED])
# -----------------------------------------------------------------------
# This will create an option that behaves as follows: If omitted, or
# called with "no", then set the enable_variable to "no" and do
# nothing else. If called with "yes", then execute DEFAULT-ACTION. If
# called with argument, set enable_variable to "yes" and execute
# ARG-ACTION. Additionally, execute ACTION-ENABLED if we ended up with
# "yes" either way, else ACTION-DISABLED.
#
# The intent is to allow enabling a feature, and optionally pass an
# additional piece of information.
AC_DEFUN([PGAC_ARG_OPTARG],
[PGAC_ARG([$1], [$2], [$3], [$4], [],
[pgac_arg_to_variable([$1], [$2])=yes
$5],
[pgac_arg_to_variable([$1], [$2])=no])
dnl Add this code only if there's a ACTION-ENABLED or ACTION-DISABLED.
m4_ifval([$6[]$7],
[
if test "[$]pgac_arg_to_variable([$1], [$2])" = yes; then
m4_default([$6], :)
m4_ifval([$7],
[else
$7
])[]dnl
fi
])[]dnl
])# PGAC_ARG_OPTARG