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, 10 insertions, 0 deletions

diff --git a/gcc/opts.c b/gcc/opts.c
index ac409f4..5ec9980 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -863,6 +863,16 @@ finish_options (struct gcc_options *opts, struct gcc_options *opts_set,
       opts->x_flag_reorder_blocks = 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 functions.  But if partitioning
+     was turned on explicitly just hope for the best.  */
+  if (opts->x_flag_split_stack
+      && opts->x_flag_reorder_blocks_and_partition
+      && !opts_set->x_flag_reorder_blocks_and_partition)
+    opts->x_flag_reorder_blocks_and_partition = 0;
+
   if (opts->x_flag_reorder_blocks_and_partition
       && !opts_set->x_flag_reorder_functions)
     opts->x_flag_reorder_functions = 1;