clang-1/test/CodeGenCXX/builtins.cpp

// RUN: %clang_cc1 -emit-llvm -o - %s | FileCheck %s

// PR8839
extern "C" char memmove();

int main() {
  // CHECK: call signext i8 @memmove()
  return memmove();
}
In C++, if the user redeclares a builtin function with a type that is inconsistent with the type that the builtin should have, forget about the builtin altogether: we don't want subsequence analyses, CodeGen, etc., to think that we have a proper builtin function. C is protected from errors here because it allows one to use a library builtin without having a declaration, and detects inconsistent (re-)declarations of builtins during declaration merging. C++ was unprotected, and therefore would crash. Fixes PR8839. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@122351 91177308-0d34-0410-b5e6-96231b3b80d8 2010-12-21 22:47:46 +03:00			`// RUN: %clang_cc1 -emit-llvm -o - %s \| FileCheck %s`

			`// PR8839`
			`extern "C" char memmove();`

			`int main() {`
			`// CHECK: call signext i8 @memmove()`
			`return memmove();`
			`}`