opts.c (finish_options): If -fsplit-stack, disable implicit -forder-blocks-and-partition.

gcc/:
	* opts.c (finish_options): If -fsplit-stack, disable implicit
	-forder-blocks-and-partition.
	* doc/invoke.texi (Optimize Options): Document that when using
	-fsplit-stack -forder-blocks-and-partition is not implicitly
	enabled.
gcc/go/:
	* go-lang.c (go_langhook_post_options): If -fsplit-stack is turned
	on, disable implicit -forder-blocks-and-partition.
gcc/testsuite/:
	* gcc.dg/tree-prof/split-1.c: New test.

From-SVN: r249071

1 files changed, 9 insertions, 0 deletions

diff --git a/gcc/go/go-lang.c b/gcc/go/go-lang.c
index 780d737..09e4fea 100644
--- a/gcc/go/go-lang.c
+++ b/gcc/go/go-lang.c
@@ -304,6 +304,15 @@ go_langhook_post_options (const char **pfilename ATTRIBUTE_UNUSED)
       && targetm_common.supports_split_stack (false, &global_options))
     global_options.x_flag_split_stack = 1;
 
+  /* If stack splitting is turned on, and the user did not explicitly
+     request function partitioning, turn off partitioning, as it
+     confuses the linker when trying to handle partitioned split-stack
+     code that calls a non-split-stack function.  */
+  if (global_options.x_flag_split_stack
+      && global_options.x_flag_reorder_blocks_and_partition
+      && !global_options_set.x_flag_reorder_blocks_and_partition)
+    global_options.x_flag_reorder_blocks_and_partition = 0;
+
   /* Returning false means that the backend should be used.  */
   return false;
 }