Imported Upstream version 0.6.2+git20140204

[mirror_zfs-debian.git] / config / always-no-aggressive-loop-optimizations.m4

diff --git a/config/always-no-aggressive-loop-optimizations.m4 b/config/always-no-aggressive-loop-optimizations.m4
new file mode 100644 (file)
index 0000000..8f2115a
--- /dev/null
+++ b/config/always-no-aggressive-loop-optimizations.m4
@@ -0,0 +1,20 @@
+dnl #
+dnl # Check if gcc supports -fno-aggressive-loop-optimizations
+dnl #
+AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_NO_AGGRESSIVE_LOOP_OPTIMIZATIONS], [
+       AC_MSG_CHECKING([for -fno-aggressive-loop-optimizations support])
+
+       saved_flags="$CFLAGS"
+       CFLAGS="$CFLAGS -fno-aggressive-loop-optimizations"
+
+       AC_RUN_IFELSE([AC_LANG_PROGRAM([], [])], [
+               NO_AGGRESSIVE_LOOP_OPTIMIZATIONS=-fno-aggressive-loop-optimizations
+               AC_MSG_RESULT([yes])
+       ], [
+               NO_AGGRESSIVE_LOOP_OPTIMIZATIONS=
+               AC_MSG_RESULT([no])
+       ])
+
+       CFLAGS="$saved_flags"
+       AC_SUBST([NO_AGGRESSIVE_LOOP_OPTIMIZATIONS])
+])