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| author | Amitay Isaacs <amitay@ozlabs.org> | 2018-07-10 14:38:50 +1000 |
|---|---|---|
| committer | Erik de Castro Lopo <erikd@mega-nerd.com> | 2018-08-20 18:16:34 +1000 |
| commit | 08d9d985daf51644755c77185996501c1b386574 (patch) | |
| tree | 37b0c3b95a83511ee77943ad511d81b6627c9d10 | |
| parent | f301518c5288d495cff463ec7f1e3972918f285b (diff) | |
| download | flac-08d9d985daf51644755c77185996501c1b386574.tar.gz | |
Add m4 macro to check for C __attribute__ features
Signed-off-by: Amitay Isaacs <amitay@ozlabs.org>
| -rw-r--r-- | m4/c_attribute.m4 | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/m4/c_attribute.m4 b/m4/c_attribute.m4 new file mode 100644 index 00000000..48aa6223 --- /dev/null +++ b/m4/c_attribute.m4 @@ -0,0 +1,18 @@ +# +# Check for supported __attribute__ features +# +# AC_C_ATTRIBUTE(FEATURE, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) +# +AC_DEFUN([AC_C_ATTRIBUTE], +[AS_VAR_PUSHDEF([CACHEVAR], [ax_cv_c_attribute_$1])dnl +AC_CACHE_CHECK([for __attribute__ (($1))], + CACHEVAR,[ + AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], + [[ void foo(void) __attribute__ (($1)); ]])], + [AS_VAR_SET(CACHEVAR, [yes])], + [AS_VAR_SET(CACHEVAR, [no])])]) +AS_VAR_IF(CACHEVAR,yes, + [m4_default([$2], :)], + [m4_default([$3], :)]) +AS_VAR_POPDEF([CACHEVAR])dnl +])dnl |