================
@@ -0,0 +1,15 @@
+// There are at least 2 valid C null-pointer constants as defined
+// by the C language standard.
+// Test that the macro NULL is defined consistently for all platforms by
+// those headers that the C standard mandates a macro definition for NULL.
+
+// RUN: %clang %s -Dheader="<locale.h>" -E | tail -1 | FileCheck %s
+// RUN: %clang %s -Dheader="<stdio.h>" -E | tail -1 | FileCheck %s
+// RUN: %clang %s -Dheader="<stdlib.h>" -E | tail -1 | FileCheck %s
+// RUN: %clang %s -Dheader="<string.h>" -E | tail -1 | FileCheck %s
+// RUN: %clang %s -Dheader="<time.h>" -E | tail -1 | FileCheck %s
+// RUN: %clang %s -Dheader="<wchar.h>" -E | tail -1 | FileCheck %s
----------------
efriedma-quic wrote:

This is assuming that the default search path for clang will find system 
headers. This isn't really a safe assumption if the default triple is a 
cross-compile triple.

https://github.com/llvm/llvm-project/pull/149176
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