[gcc r13-8297] Fix contracts-tmpl-spec2.C on targets where plain char is unsigned by default

[gcc r13-8297] Fix contracts-tmpl-spec2.C on targets where plain char is unsigned by default

[Torbjorn Svensson]

https://gcc.gnu.org/g:0cdb04629641c51498f099db04021e8de51adedb

commit r13-8297-g0cdb04629641c51498f099db04021e8de51adedb
Author: Andrew Pinski <quic_apinski@quicinc.com>
Date:   Thu Nov 23 18:55:30 2023 -0800

    Fix contracts-tmpl-spec2.C on targets where plain char is unsigned by default
    
    Since contracts-tmpl-spec2.C is just testing contracts, I thought it would be better
    to just add `-fsigned-char` to the options rather than change the testcase to support
    both cases.
    
    Committed after testing on aarch64-linux-gnu.
    
    gcc/testsuite/ChangeLog:
    
            PR testsuite/108321
            * g++.dg/contracts/contracts-tmpl-spec2.C: Add -fsigned-char
            to options.
    
    Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>
    
    (cherry picked from commit 6e15e4e1abed02443a27a69455f4bfa49457c99e)

Diff:
---
 gcc/testsuite/g++.dg/contracts/contracts-tmpl-spec2.C | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/testsuite/g++.dg/contracts/contracts-tmpl-spec2.C b/gcc/testsuite/g++.dg/contracts/contracts-tmpl-spec2.C
index 82117671b2d3..fd3a25bd0514 100644
--- a/gcc/testsuite/g++.dg/contracts/contracts-tmpl-spec2.C
+++ b/gcc/testsuite/g++.dg/contracts/contracts-tmpl-spec2.C
@@ -1,6 +1,6 @@
 // basic test to ensure contracts work for class and member specializations
 // { dg-do run }
-// { dg-options "-std=c++2a -fcontracts -fcontract-continuation-mode=on" }
+// { dg-options "-std=c++2a -fcontracts -fcontract-continuation-mode=on -fsigned-char" }
 #include <cstdio>
 
 // template specializations can have differing contracts