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--- a/configure.ac 2011-09-22 16:13:22 +0000
+++ b/configure.ac 2011-11-26 23:55:24 +0000
@@ -381,6 +381,28 @@
AC_SUBST(HAVE_DARWIN_IEEE_INTERFACE)
AC_SUBST(HAVE_DARWIN86_IEEE_INTERFACE)
+dnl check for compiler flags to disable use of FMA
+save_cflags="$CFLAGS"
+AC_CACHE_CHECK([for compiler flags to disable use of FMA], ac_cv_c_fma_flags,
+[
+if test X"$GCC" = Xyes; then
+ fma_flags='-ffp-contract=off'
+else
+ fma_flags=
+fi
+if test X"$fma_flags" != X; then
+ CFLAGS="$fma_flags $CFLAGS"
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[int foo;]])],[ac_cv_c_fma_flags="$fma_flags"],[ac_cv_c_fma_flags="none"])
+else
+ ac_cv_c_fma_flags="none"
+fi])
+
+if test "$ac_cv_c_fma_flags" != "none" ; then
+ CFLAGS="$ac_cv_c_fma_flags $save_cflags"
+else
+ CFLAGS="$save_cflags"
+fi
+
dnl Check for IEEE control flags
save_cflags="$CFLAGS"
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