[gcc r17-910] libstdc++: Fix -fno-exceptions support in testsuite_allocator.h

[Patrick Palka]

https://gcc.gnu.org/g:b64700dec403f9b2b605df295e43c73b3185d0f5

commit r17-910-gb64700dec403f9b2b605df295e43c73b3185d0f5
Author: Patrick Palka <ppalka@redhat.com>
Date:   Thu May 28 10:41:33 2026 -0400

    libstdc++: Fix -fno-exceptions support in testsuite_allocator.h
    
    This fixes the error
    
    .../testsuite_allocator.h:402:13: error: exception handling disabled, use '-fexceptions' to enable
      402 |             catch(...)
          |             ^~~~~
    
    seen when running some C++23 library tests with -fno-exceptions.
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/util/testsuite_allocator.h
            (uneq_allocator::allocate): Use __try/__catch instead.
            (uneq_allocator::allocate_at_least): Likewise.
    
    Reviewed-by: Jonathan Wakely <jwakely@redhat.com>

Diff:
---
 libstdc++-v3/testsuite/util/testsuite_allocator.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/libstdc++-v3/testsuite/util/testsuite_allocator.h b/libstdc++-v3/testsuite/util/testsuite_allocator.h
index 27372a97161d..3a9ae0de5853 100644
--- a/libstdc++-v3/testsuite/util/testsuite_allocator.h
+++ b/libstdc++-v3/testsuite/util/testsuite_allocator.h
@@ -369,12 +369,12 @@ namespace __gnu_test
 	if (std::__is_constant_evaluated())
 	  return p;
 
-	try
+	__try
 	  {
 	    get_map().insert(map_type::value_type(reinterpret_cast<void*>(p),
 						  personality));
 	  }
-	catch(...)
+	__catch(...)
 	  {
 	    AllocTraits::deallocate(*this, p, n);
 	    __throw_exception_again;
@@ -394,12 +394,12 @@ namespace __gnu_test
 	  { return r; }
 	else
 	  {
-	    try
+	    __try
 	      {
 		get_map().insert(map_type::value_type(
 		      reinterpret_cast<void*>(r.ptr), personality));
 	      }
-	    catch(...)
+	    __catch(...)
 	      {
 		AllocTraits::deallocate(*this, r.ptr, r.count);
 		__throw_exception_again;