projects / lttng-tools.git / blame
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|---|---|---|
| 7f08cc82 SM |
1 | # =========================================================================== |
| 2 | # https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html | |
| 3 | # =========================================================================== | |
| 4 | # | |
| 5 | # SYNOPSIS | |
| 6 | # | |
| 7 | # AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT]) | |
| 8 | # | |
| 9 | # DESCRIPTION | |
| 10 | # | |
| 11 | # Check whether the given FLAG works with the current language's compiler | |
| 12 | # or gives an error. (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 current language's default | |
| 18 | # flags (e.g. CFLAGS) when the check is done. The check is thus made with | |
| 19 | # the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to | |
| 20 | # force the compiler to issue an error when a bad flag is given. | |
| 21 | # | |
| 22 | # INPUT gives an alternative input source to AC_COMPILE_IFELSE. | |
| 23 | # | |
| 24 | # NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this | |
| 25 | # macro in sync with AX_CHECK_{PREPROC,LINK}_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 | # 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. | |
| 36 | ||
| 37 | #serial 6 | |
| 38 | ||
| 39 | AC_DEFUN([AX_CHECK_COMPILE_FLAG], | |
| 40 | [AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF | |
| 41 | AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl | |
| 42 | AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [ | |
| 43 | ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS | |
| 44 | _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1" | |
| 45 | AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])], | |
| 46 | [AS_VAR_SET(CACHEVAR,[yes])], | |
| 47 | [AS_VAR_SET(CACHEVAR,[no])]) | |
| 48 | _AC_LANG_PREFIX[]FLAGS=$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_COMPILE_FLAGS |