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-rw-r--r--m4/ax_c_lto.m421
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