[gcc r17-2866] libstdc++: Disable "-Winvalid-specialization" for g++ coroutine tests.

https://gcc.gnu.org/g:44ab45453a49724b9d50b3979fc60eb18d355735

commit r17-2866-g44ab45453a49724b9d50b3979fc60eb18d355735
Author: Tomasz Kamiński <[email protected]>
Date:   Sat Aug 1 09:08:15 2026 +0200

    libstdc++: Disable "-Winvalid-specialization" for g++ coroutine tests.
    
    These test define specializations for libstdc++ std::coroutine_handle
    definition, that is marked [[_Clang::__no_specializations]] since
    r17-2853-gb90df55625eb40.
    
    gcc/testsuite/ChangeLog:
    
            * g++.dg/coroutines/pr105475-3.C: Add -Wno-invalid-specialization
            option.
            * g++.dg/coroutines/pr105475-broken-spec.C: Likewise.

Diff:
---
 gcc/testsuite/g++.dg/coroutines/pr105475-3.C           | 1 +
 gcc/testsuite/g++.dg/coroutines/pr105475-broken-spec.C | 1 +
 2 files changed, 2 insertions(+)

diff --git a/gcc/testsuite/g++.dg/coroutines/pr105475-3.C b/gcc/testsuite/g++.dg/coroutines/pr105475-3.C
index 75e0624ad719..4a7385bbdb28 100644
--- a/gcc/testsuite/g++.dg/coroutines/pr105475-3.C
+++ b/gcc/testsuite/g++.dg/coroutines/pr105475-3.C
@@ -1,3 +1,4 @@
+// { dg-additional-options "-Wno-invalid-specialization" }
 // https://gcc.gnu.org/PR105475
 // Test the case where we create a non-static from_address.
 #include <coroutine>
diff --git a/gcc/testsuite/g++.dg/coroutines/pr105475-broken-spec.C b/gcc/testsuite/g++.dg/coroutines/pr105475-broken-spec.C
index 07bf9b06aed9..c48ddc261519 100644
--- a/gcc/testsuite/g++.dg/coroutines/pr105475-broken-spec.C
+++ b/gcc/testsuite/g++.dg/coroutines/pr105475-broken-spec.C
@@ -1,3 +1,4 @@
+// { dg-additional-options "-Wno-invalid-specialization" }
 // https://gcc.gnu.org/PR105475
 // Test the case where we specialize coroutine_handle and break it.
 #include <coroutine>