Give -fwrapv to gcc when it supports it

[ghc-hetmet.git] / compiler / main / DriverPipeline.hs

diff --git a/compiler/main/DriverPipeline.hs b/compiler/main/DriverPipeline.hs
index fddeb6d..59f0721 100644 (file)
--- a/compiler/main/DriverPipeline.hs
+++ b/compiler/main/DriverPipeline.hs
@@ -880,6 +880,10 @@ runPhase cc_phase stop dflags basename suff input_fn get_output_fn maybe_loc
                       ++ split_opt
                       ++ include_paths
                       ++ pkg_extra_cc_opts
+#ifdef HAVE_GCC_HAS_WRAPV
+                  -- We need consistent integer overflow (trac #952)
+               ++ ["-fwrapv"]
+#endif
                       ))
 
        return (next_phase, dflags, maybe_loc, output_fn)