projects / lttng-tools.git / blame
| Commit | Line | Data |
|---|---|---|
| b75d311f FD |
1 | # =========================================================================== |
| 2 | # https://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 | # | |
| 6333b87b 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. | |
| b75d311f | 36 | |
| 6333b87b | 37 | #serial 6 |
| b75d311f FD |
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 |