[gcc r14-12057] libstdc++: Fix FAIL: 20_util/ratio/operations/ops_overflow_neg.cc [PR122168]

[Jonathan Wakely]

https://gcc.gnu.org/g:0bb897ac9fd455124dc7e592655afbd933445e63

commit r14-12057-g0bb897ac9fd455124dc7e592655afbd933445e63
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon Oct 6 12:16:37 2025 +0100

    libstdc++: Fix FAIL: 20_util/ratio/operations/ops_overflow_neg.cc [PR122168]
    
    This backports the additional dg-error added by r15-3859-g63a598deb0c9fc
    which is now also needed on gcc-14 due to r14-12048-g9c3777e9619ad3
    having been backported.
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/122168
            * testsuite/20_util/ratio/operations/ops_overflow_neg.cc: Add
            dg-error for additional error seen with -Wsystem-headers.

Diff:
---
 libstdc++-v3/testsuite/20_util/ratio/operations/ops_overflow_neg.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libstdc++-v3/testsuite/20_util/ratio/operations/ops_overflow_neg.cc b/libstdc++-v3/testsuite/20_util/ratio/operations/ops_overflow_neg.cc
index ced900bd4727..6d80793fb968 100644
--- a/libstdc++-v3/testsuite/20_util/ratio/operations/ops_overflow_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/ratio/operations/ops_overflow_neg.cc
@@ -48,5 +48,6 @@ test02()
 // { dg-error "overflow in multiplication" "" { target *-*-* } 105 }
 // { dg-error "overflow in constant expression" "" { target *-*-* } 0 }
 // { dg-error "narrowing conversion" "" { target *-*-* } 0 }
+// { dg-error "overflow in expression" "" { target *-*-* } 112 }
 // { dg-prune-output "out of range" }
 // { dg-prune-output "not usable in a constant expression" }