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f0d8d709 | 1 | # =========================================================================== |
6e5d9dfa | 2 | # https://www.gnu.org/software/autoconf-archive/ax_check_link_flag.html |
f0d8d709 AM |
3 | # =========================================================================== |
4 | # | |
5 | # SYNOPSIS | |
6 | # | |
7 | # AX_CHECK_LINK_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT]) | |
8 | # | |
9 | # DESCRIPTION | |
10 | # | |
11 | # Check whether the given FLAG works with the linker or gives an error. | |
12 | # (Warnings, however, are ignored) | |
13 | # | |
14 | # ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on | |
15 | # success/failure. | |
16 | # | |
17 | # If EXTRA-FLAGS is defined, it is added to the linker's default flags | |
18 | # when the check is done. The check is thus made with the flags: "LDFLAGS | |
19 | # EXTRA-FLAGS FLAG". This can for example be used to force the linker to | |
20 | # issue an error when a bad flag is given. | |
21 | # | |
22 | # INPUT gives an alternative input source to AC_LINK_IFELSE. | |
23 | # | |
24 | # NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this | |
25 | # macro in sync with AX_CHECK_{PREPROC,COMPILE}_FLAG. | |
26 | # | |
27 | # LICENSE | |
28 | # | |
29 | # Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de> | |
30 | # Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com> | |
31 | # | |
7fcdef32 MJ |
32 | # Copying and distribution of this file, with or without modification, are |
33 | # permitted in any medium without royalty provided the copyright notice | |
34 | # and this notice are preserved. This file is offered as-is, without any | |
35 | # warranty. | |
f0d8d709 | 36 | |
7fcdef32 | 37 | #serial 6 |
f0d8d709 AM |
38 | |
39 | AC_DEFUN([AX_CHECK_LINK_FLAG], | |
40 | [AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF | |
41 | AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl | |
42 | AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [ | |
43 | ax_check_save_flags=$LDFLAGS | |
44 | LDFLAGS="$LDFLAGS $4 $1" | |
45 | AC_LINK_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])], | |
46 | [AS_VAR_SET(CACHEVAR,[yes])], | |
47 | [AS_VAR_SET(CACHEVAR,[no])]) | |
48 | LDFLAGS=$ax_check_save_flags]) | |
49 | AS_VAR_IF(CACHEVAR,yes, | |
50 | [m4_default([$2], :)], | |
51 | [m4_default([$3], :)]) | |
52 | AS_VAR_POPDEF([CACHEVAR])dnl | |
53 | ])dnl AX_CHECK_LINK_FLAGS |