llvm-project/clang/test/CodeGenCXX/cxx20-module-extern-1.cppm
Nathan Sidwell ae4dce8659 [clang][ABI] New C++20 module mangling scheme
Implement a demangleable strong ownership symbol mangling.

 * The original module symbol mangling scheme turned out to be
undemangleable.

 * The hoped-for C++17 compatibility of weak ownership turns out to be
fragile

* C++20 now has better ways of controlling C++17 compatibility

The issue is captured on the ABI list at:
  https://github.com/itanium-cxx-abi/cxx-abi/issues/134

GCC implements this new mangling.

The old mangling is unceremoniously dropped.  No backwards
compatibility, no deprectated old-mangling flag.  It was always
labelled experimental.  (Old and new manglings cannot be confused.)

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D122256
2022-03-30 08:51:27 -07:00

19 lines
387 B
C++

// RUN: %clang_cc1 -std=c++20 %s -triple %itanium_abi_triple -emit-llvm -o - | FileCheck %s
// module-purview extern "C++" semantics not implemented
// XFAIL: *
export module FOO;
extern "C++" export class A;
export class B;
// CHECK-DAG: void @_ZW3FOO3FooP1APNS_1B(
export void Foo (A *, B*) {
}
extern "C++" {
// CHECK-DAG: void @_Z3BarP1APW3FOO1B(
export void Bar (A *, B*) {
}
}