https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119718
--- Comment #13 from lucier at math dot purdue.edu ---
This is the change I made to report warnings when was
maybe_complain_about_tail_call called:
heine:~/programs/gcc/gcc-mainline/gcc> git diff
diff --git a/gcc/calls.cc b/gcc/calls.cc
index b3dccd85ec8..b78b79db271 100644
--- a/gcc/calls.cc
+++ b/gcc/calls.cc
@@ -1273,11 +1273,13 @@ void
maybe_complain_about_tail_call (tree call_expr, const char *reason)
{
gcc_assert (TREE_CODE (call_expr) == CALL_EXPR);
- if (!CALL_EXPR_MUST_TAIL_CALL (call_expr))
- return;
-
- error_at (EXPR_LOCATION (call_expr), "cannot tail-call: %s", reason);
+ if (CALL_EXPR_MUST_TAIL_CALL (call_expr))
+ error_at (EXPR_LOCATION (call_expr), "cannot tail-call: %s", reason);
+ else if (flag_optimize_sibling_calls)
+ warning (OPT_Wdisabled_optimization,
+ "cannot apply sibling-call optimization: %s", reason);
CALL_EXPR_MUST_TAIL_CALL (call_expr) = 0;
+ return;
}
/* Fill in ARGS_SIZE and ARGS array based on the parameters found in
