clang/test/SemaCXX/externc-ifunc-resolver.cpp

   1 // RUN: %clang_cc1 -emit-llvm-only -triple x86_64-linux-gnu -verify %s
   2 // RUN: %clang_cc1 -emit-llvm-only -triple x86_64-apple-macosx -verify %s
   3 // RUN: %clang_cc1 -emit-llvm-only -triple arm64-apple-macosx -verify %s
   4 // RUN: not %clang_cc1 -triple x86_64-linux -emit-llvm-only -fdiagnostics-parseable-fixits %s 2>&1 | FileCheck %s
   5 // RUN: not %clang_cc1 -triple x86_64-apple-macosx -emit-llvm-only -fdiagnostics-parseable-fixits %s 2>&1 | FileCheck %s
   6 // RUN: not %clang_cc1 -triple arm64-apple-macosx -emit-llvm-only -fdiagnostics-parseable-fixits %s 2>&1 | FileCheck %s
   7
   8 extern "C" {
   9 __attribute__((used)) static void *resolve_foo() { return 0; }
  10 namespace NS {
  11 __attribute__((used)) static void *resolve_foo() { return 0; }
  12 } // namespace NS
  13
  14 // FIXME: This diagnostic is pretty confusing, the issue is that the existence
  15 // of the two functions suppresses the 'alias' creation, and thus the ifunc
  16 // resolution via the alias as well. In the future we should probably find
  17 // some way to improve this diagnostic (likely by diagnosing when we decide
  18 // this case suppresses alias creation).
  19 __attribute__((ifunc("resolve_foo"))) void foo(); // expected-error{{ifunc must point to a defined function}}
  20 // expected-note@-1 {{must refer to its mangled name}}
  21 // expected-note@-2 {{function by that name is mangled as}}
  22 // expected-note@-3 {{function by that name is mangled as}}
  23 // CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:16-[[@LINE-4]]:36}:"ifunc(\"_ZL11resolve_foov\")"
  24 // CHECK: fix-it:"{{.*}}":{[[@LINE-5]]:16-[[@LINE-5]]:36}:"ifunc(\"_ZN2NSL11resolve_fooEv\")"
  25 }
  26