diff options
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/ax_c_lto.m4 | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/m4/ax_c_lto.m4 b/m4/ax_c_lto.m4 new file mode 100644 index 000000000..7e6bc0119 --- /dev/null +++ b/m4/ax_c_lto.m4 @@ -0,0 +1,21 @@ +# AC_C_LTO +# ------------- +# Define HAVE_LTO if -flto works. +AN_IDENTIFIER([lto], [AC_C_LTO]) +AC_DEFUN([AC_C_LTO], +[AC_CACHE_CHECK([if -flto builds executables], ac_cv_c_lto, +[AC_RUN_IFELSE( + [AC_LANG_SOURCE( + [[#include <stdio.h> + int main(int argc, char **argv) { + return 0; + } + ]])], + [ac_cv_c_lto=yes], + [ac_cv_c_lto=no], + [ac_cv_c_lto=${ac_cv_c_lto_cross_compile}])]) +if test "${ac_cv_c_lto}" = "yes"; then + AC_DEFINE([HAVE_LTO], 1, + [Define to 1 if -flto works.]) +fi +])# AC_C_LTO |