testsuite: Fix gcc.dg/plugin/must-tail-call-2.c on SPARC [PR121159]

The gcc.dg/plugin/must-tail-call-2.c test FAILs on 32 and 64-bit SPARC:

FAIL: gcc.dg/plugin/must-tail-call-2.c -fplugin=./must_tail_call_plugin.so (test for excess errors)

Excess errors:
gcc.dg/plugin/must-tail-call-2.c:58:3: error: cannot tail-call: target is not able to optimize the call into a sibling call

As discussed in the PR, this can be avoided by compiling with
-fdelayed-branch on SPARC.

Tested on sparc-sun-solaris2.11, sparc64-unknown-linux-gnu, and
x86_64-pc-linux-gnu.

2026-03-09  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	gcc/testsuite:
	PR middle-end/121159
	* gcc.dg/plugin/must-tail-call-2.c (dg-additional-options): Add
	-fdelayed-branch on SPARC.

diff --git a/gcc/testsuite/gcc.dg/plugin/must-tail-call-2.c b/gcc/testsuite/gcc.dg/plugin/must-tail-call-2.c
index 6f65f4ab96cbf8e50ff0f29a0ee5cc7afd44af9c..d37a016ae89bb4be84a61969bd1269e3869b79f4 100644 (file)
--- a/gcc/testsuite/gcc.dg/plugin/must-tail-call-2.c
+++ b/gcc/testsuite/gcc.dg/plugin/must-tail-call-2.c
@@ -1,6 +1,8 @@
 /* { dg-do compile { target tail_call } } */
 /* Allow nested functions.  */
 /* { dg-options "-Wno-pedantic" } */
+/* PR middle-end/121159  */
+/* { dg-additional-options "-fdelayed-branch" { target sparc*-*-* } } */
 
 struct box { char field[64]; int i; };