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53 lines
1.9 KiB
53 lines
1.9 KiB
# =========================================================================== |
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# https://www.gnu.org/software/autoconf-archive/ax_check_link_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_LINK_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 linker or gives an error. |
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# (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 linker's default flags |
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# when the check is done. The check is thus made with the flags: "LDFLAGS |
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# EXTRA-FLAGS FLAG". This can for example be used to force the linker to |
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# 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_LINK_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_{PREPROC,COMPILE}_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_LINK_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_ldflags_$4_$1])dnl |
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AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [ |
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ax_check_save_flags=$LDFLAGS |
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LDFLAGS="$LDFLAGS $4 $1" |
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AC_LINK_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])], |
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[AS_VAR_SET(CACHEVAR,[yes])], |
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[AS_VAR_SET(CACHEVAR,[no])]) |
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LDFLAGS=$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_LINK_FLAGS
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