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| author | Dmitry V. Levin <ldv@altlinux.org> | 2020-08-06 18:00:00 +0000 |
|---|---|---|
| committer | Dmitry V. Levin <ldv@altlinux.org> | 2020-08-07 08:00:00 +0000 |
| commit | 84726f58785a22847cb67c2e009b5be0e207a256 (patch) | |
| tree | 4d2b87abc2c127f6fe01d75a1074c01df5c8fbe8 /m4/attribute.m4 | |
| parent | 650273e77b643f14d937f26f8b628481a4b4b56a (diff) | |
| download | linux-pam-git-84726f58785a22847cb67c2e009b5be0e207a256.tar.gz | |
m4: rewrite __attribute__((unused)) check
Rewrite using AC_CACHE_CHECK to create a more readable autoconf macro.
* m4/attribute.m4: New file.
* m4/japhar_grep_cflags.m4: Remove.
* m4/.gitignore: Replace japhar_grep_cflags.m4 with attribute.m4.
* configure.ac: Replace AC_C___ATTRIBUTE__ with PAM_ATTRIBUTE_UNUSED.
Diffstat (limited to 'm4/attribute.m4')
| -rw-r--r-- | m4/attribute.m4 | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/m4/attribute.m4 b/m4/attribute.m4 new file mode 100644 index 00000000..3aa2e5fc --- /dev/null +++ b/m4/attribute.m4 @@ -0,0 +1,16 @@ +#!/usr/bin/m4 +dnl Check for compiler attributes + +AC_DEFUN([PAM_ATTRIBUTE_UNUSED], [ + AC_CACHE_CHECK([for __attribute__((unused))], [pam_cv_attribute_unused], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM([[int fun(int i __attribute__((unused)));]], + [[return fun(0);]])], + [pam_cv_attribute_unused=yes], + [pam_cv_attribute_unused=no])]) + AS_IF([test "$pam_cv_attribute_unused" = yes], + [unused='__attribute__((unused))'], + [unused=]) + AC_DEFINE_UNQUOTED([UNUSED], [$unused], + [Define if the compiler supports __attribute__((unused))]) +]) |