freebsd-nq/config/always-no-aggressive-loop-optimizations.m4
Chunwei Chen a15dac42df config: compile test rather than run test
When testing compiler flags, we only need to do compile test. Otherwise,
configure will fail with "configure: error: cannot run test program while
cross compiling" when cross compiling.

Signed-off-by: Chunwei Chen <tuxoko@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2191
2014-03-20 12:11:57 -07:00

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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_COMPILE_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])
])