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54 lines
2.0 KiB
54 lines
2.0 KiB
# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_check_preproc_flag.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_CHECK_PREPROC_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
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#
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# DESCRIPTION
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#
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# Check whether the given FLAG works with the current language's
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# preprocessor or gives an error. (Warnings, however, are ignored)
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#
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# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
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# success/failure.
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#
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# If EXTRA-FLAGS is defined, it is added to the preprocessor's default
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# flags when the check is done. The check is thus made with the flags:
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# "CPPFLAGS EXTRA-FLAGS FLAG". This can for example be used to force the
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# preprocessor to issue an error when a bad flag is given.
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#
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# INPUT gives an alternative input source to AC_PREPROC_IFELSE.
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#
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# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
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# macro in sync with AX_CHECK_{COMPILE,LINK}_FLAG.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
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# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 6
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AC_DEFUN([AX_CHECK_PREPROC_FLAG],
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[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
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AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]cppflags_$4_$1])dnl
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AC_CACHE_CHECK([whether _AC_LANG preprocessor accepts $1], CACHEVAR, [
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ax_check_save_flags=$CPPFLAGS
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CPPFLAGS="$CPPFLAGS $4 $1"
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AC_PREPROC_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
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[AS_VAR_SET(CACHEVAR,[yes])],
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[AS_VAR_SET(CACHEVAR,[no])])
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CPPFLAGS=$ax_check_save_flags])
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AS_VAR_IF(CACHEVAR,yes,
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[m4_default([$2], :)],
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[m4_default([$3], :)])
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AS_VAR_POPDEF([CACHEVAR])dnl
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])dnl AX_CHECK_PREPROC_FLAGS
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