[libc++abi] Fix test failures with GCC 14

[philnik777]

This adds a new __cxa_call_terminate, which GCC 14 generates calls to now. Clang had __clang_call_terminate for the same use-case for a long time. It also fixes a test that is enabled now, since GCC has the __has_feature FTM now.

[llvmbot]

@llvm/pr-subscribers-libcxx

@llvm/pr-subscribers-libcxxabi

Author: Nikolas Klauser (philnik777)

Changes

This adds a new __cxa_call_terminate, which GCC 14 generates calls to now. Clang had __clang_call_terminate for the same use-case for a long time. It also fixes a test that is enabled now, since GCC has the __has_feature FTM now.

---

Full diff: https://github.com/llvm/llvm-project/pull/95759.diff

3 Files Affected:

• (modified) libcxxabi/include/cxxabi.h (+3)
• (modified) libcxxabi/src/cxa_exception.cpp (+5)
• (modified) libcxxabi/test/catch_const_pointer_nullptr.pass.cpp (+4-21)

diff --git a/libcxxabi/include/cxxabi.h b/libcxxabi/include/cxxabi.h
index 0e3969084e04f..9628ca737e6e1 100644
--- a/libcxxabi/include/cxxabi.h
+++ b/libcxxabi/include/cxxabi.h
@@ -77,6 +77,9 @@ extern _LIBCXXABI_FUNC_VIS void __cxa_end_cleanup();
 #endif
 extern _LIBCXXABI_FUNC_VIS std::type_info *__cxa_current_exception_type();
 
+// GNU extension
+extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_NORETURN void __cxa_call_terminate(void*) throw();
+
 // 2.5.4 Rethrowing Exceptions
 extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_NORETURN void __cxa_rethrow();
 
diff --git a/libcxxabi/src/cxa_exception.cpp b/libcxxabi/src/cxa_exception.cpp
index ff69a4c65e465..014e6e8ac8420 100644
--- a/libcxxabi/src/cxa_exception.cpp
+++ b/libcxxabi/src/cxa_exception.cpp
@@ -589,6 +589,11 @@ void __cxa_end_catch() {
     }
 }
 
+void __cxa_call_terminate(void* unwind_arg) throw() {
+    __cxa_begin_catch(unwind_arg);
+    std::terminate();
+}
+
 // Note:  exception_header may be masquerading as a __cxa_dependent_exception
 //        and that's ok.  exceptionType is there too.
 //        However watch out for foreign exceptions.  Return null for them.
diff --git a/libcxxabi/test/catch_const_pointer_nullptr.pass.cpp b/libcxxabi/test/catch_const_pointer_nullptr.pass.cpp
index a0d1f36f050f0..a66e6c9e53075 100644
--- a/libcxxabi/test/catch_const_pointer_nullptr.pass.cpp
+++ b/libcxxabi/test/catch_const_pointer_nullptr.pass.cpp
@@ -8,16 +8,11 @@
 
 // UNSUPPORTED: no-exceptions
 
-#include <cassert>
-
-// Clang emits  warnings about exceptions of type 'Child' being caught by
-// an earlier handler of type 'Base'. Congrats clang, you've just
-// diagnosed the behavior under test.
-#if defined(__clang__)
-#pragma clang diagnostic ignored "-Wexceptions"
-#endif
+// Clang and GCC emit warnings about exceptions of type 'Child' being caught by
+// an earlier handler of type 'Base'.
+// ADDITIONAL_COMPILE_FLAGS: -Wno-exceptions
 
-#if __has_feature(cxx_nullptr)
+#include <cassert>
 
 struct A {};
 
@@ -124,18 +119,6 @@ void test6()
     }
 }
 
-
-#else
-
-void test1() {}
-void test2() {}
-void test3() {}
-void test4() {}
-void test5() {}
-void test6() {}
-
-#endif
-
 int main(int, char**) {
     test1();
     test2();

[github-actions]

✅ With the latest revision this PR passed the C/C++ code formatter.

[ldionne]

LGTM with comments.