Don't override -ffp-contract=fast if -funsafe-math-optimizations

From-SVN: r208474

gcc/c-family/ChangeLog

+2014-03-11  Ian Bolton  <ian.bolton@arm.com>
+
+	* c-opts.c (c_common_post_options): Don't override
+	-ffp-contract=fast if unsafe-math-optimizations is on.
+
 2014-03-08  Paulo Matos  <paulo@matos-sorge.com>
 
     * c.opt: Enable LTO FE for fshort-double.

gcc/c-family/c-opts.c

@@ -834,7 +834,8 @@ c_common_post_options (const char **pfilename)
   if (flag_iso
       && !c_dialect_cxx ()
       && (global_options_set.x_flag_fp_contract_mode
-	  == (enum fp_contract_mode) 0))
+	  == (enum fp_contract_mode) 0)
+      && flag_unsafe_math_optimizations == 0)
     flag_fp_contract_mode = FP_CONTRACT_OFF;
 
   /* By default we use C99 inline semantics in GNU99 or C99 mode.  C99