projects / babeltrace.git / blame
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| 203d6b31 AM |
1 | # =========================================================================== |
| 2 | # http://www.gnu.org/software/autoconf-archive/ax_check_link_flag.html | |
| 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 | # | |
| 32 | # This program is free software: you can redistribute it and/or modify it | |
| 33 | # under the terms of the GNU General Public License as published by the | |
| 34 | # Free Software Foundation, either version 3 of the License, or (at your | |
| 35 | # option) any later version. | |
| 36 | # | |
| 37 | # This program is distributed in the hope that it will be useful, but | |
| 38 | # WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 39 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General | |
| 40 | # Public License for more details. | |
| 41 | # | |
| 42 | # You should have received a copy of the GNU General Public License along | |
| 43 | # with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 44 | # | |
| 45 | # As a special exception, the respective Autoconf Macro's copyright owner | |
| 46 | # gives unlimited permission to copy, distribute and modify the configure | |
| 47 | # scripts that are the output of Autoconf when processing the Macro. You | |
| 48 | # need not follow the terms of the GNU General Public License when using | |
| 49 | # or distributing such scripts, even though portions of the text of the | |
| 50 | # Macro appear in them. The GNU General Public License (GPL) does govern | |
| 51 | # all other use of the material that constitutes the Autoconf Macro. | |
| 52 | # | |
| 53 | # This special exception to the GPL applies to versions of the Autoconf | |
| 54 | # Macro released by the Autoconf Archive. When you make and distribute a | |
| 55 | # modified version of the Autoconf Macro, you may extend this special | |
| 56 | # exception to the GPL to apply to your modified version as well. | |
| 57 | ||
| 58 | #serial 4 | |
| 59 | ||
| 60 | AC_DEFUN([AX_CHECK_LINK_FLAG], | |
| 61 | [AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF | |
| 62 | AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl | |
| 63 | AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [ | |
| 64 | ax_check_save_flags=$LDFLAGS | |
| 65 | LDFLAGS="$LDFLAGS $4 $1" | |
| 66 | AC_LINK_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])], | |
| 67 | [AS_VAR_SET(CACHEVAR,[yes])], | |
| 68 | [AS_VAR_SET(CACHEVAR,[no])]) | |
| 69 | LDFLAGS=$ax_check_save_flags]) | |
| 70 | AS_VAR_IF(CACHEVAR,yes, | |
| 71 | [m4_default([$2], :)], | |
| 72 | [m4_default([$3], :)]) | |
| 73 | AS_VAR_POPDEF([CACHEVAR])dnl | |
| 74 | ])dnl AX_CHECK_LINK_FLAGS |