llvm-project/clang/test/Headers/ms-null-ms-header-vs-stddef...

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// RUN: %clang -fsyntax-only -target i686-pc-win32 %s
// RUN: %clang -fsyntax-only -target i386-mingw32 %s
// Something in MSVC's headers (pulled in e.g. by <crtdefs.h>) defines __null
// to something, mimick that.
#define __null
#include <stddef.h>
// __null is used as a type annotation in MS headers, with __null defined to
// nothing in regular builds. This should continue to work even with stddef.h
// included.
void f(__null void* p) { }
// NULL should work fine even with __null defined to nothing.
void* p = NULL;