[clang] [test] Verify that intrinsic headers don't use unreserved names

clang/test/Headers/arm-acle-header.c

@@ -10,6 +10,8 @@
 // RUN: %clang_cc1 -x c++ -triple arm64ec-windows -target-cpu cortex-a53 -fsyntax-only -ffreestanding -fms-extensions -fms-compatibility -fms-compatibility-version=19.11 %s
 // expected-no-diagnostics
 
+#include "system_reserved_names.h"
+
 #include <arm_acle.h>
 #ifdef _MSC_VER
 #include <intrin.h>

clang/test/Headers/arm-cde-header.c

@@ -9,5 +9,7 @@
 
 // Check that the headers don't conflict with each other
 
+#include "system_reserved_names.h"
+
 #include <arm_cde.h>
 #include <arm_mve.h>

clang/test/Headers/arm-cmse-header.c

@@ -2,6 +2,8 @@
 // RUN: %clang_cc1 -triple thumbv8m.base-eabi  -fsyntax-only -ffreestanding -x c++ %s -verify -mcmse
 // expected-no-diagnostics
 
+#include "system_reserved_names.h"
+
 #include <arm_cmse.h>
 
 typedef void (*callback_t)(void);

clang/test/Headers/arm-fp16-header.c

@@ -18,4 +18,6 @@
 
 // REQUIRES: aarch64-registered-target || arm-registered-target
 
+#include "system_reserved_names.h"
+
 #include <arm_fp16.h>

clang/test/Headers/arm-neon-header.c

@@ -26,4 +26,6 @@
 
 // REQUIRES: aarch64-registered-target || arm-registered-target
 
+#include "system_reserved_names.h"
+
 #include <arm_neon.h>

clang/test/Headers/system_reserved_names.h

@@ -0,0 +1,165 @@
+// Test that headers are not tripped up by the surrounding code defining various
+// alphabetic macros. Also ensure that we don't swallow the definition of user
+// provided macros (in other words, ensure that we push/pop correctly everywhere).
+//
+// The contents of this header is a lightly trimmed version of
+// libcxx/test/libcxx/system_reserved_names.gen.py; additions to that testcase
+// can be synced into this header as well.
+
+#define SYSTEM_RESERVED_NAME This name should not be used in Clang headers
+
+// libc++ does not use single-letter names as a matter of principle.
+// But Windows' own <wchar.h>, <math.h>, and <exception> use many of these
+// (at least C,E,F,I,M,N,P,S,X,Y,Z) as uglified function parameter names,
+// so don't define these on Windows.
+//
+#ifndef _WIN32
+#define _A SYSTEM_RESERVED_NAME
+#define _B SYSTEM_RESERVED_NAME
+#define _C SYSTEM_RESERVED_NAME
+#define _D SYSTEM_RESERVED_NAME
+#define _E SYSTEM_RESERVED_NAME
+#define _F SYSTEM_RESERVED_NAME
+#define _G SYSTEM_RESERVED_NAME
+#define _H SYSTEM_RESERVED_NAME
+#define _I SYSTEM_RESERVED_NAME
+#define _J SYSTEM_RESERVED_NAME
+#define _K SYSTEM_RESERVED_NAME
+#define _L SYSTEM_RESERVED_NAME
+#define _M SYSTEM_RESERVED_NAME
+#define _N SYSTEM_RESERVED_NAME
+#define _O SYSTEM_RESERVED_NAME
+#define _P SYSTEM_RESERVED_NAME
+#define _Q SYSTEM_RESERVED_NAME
+#define _R SYSTEM_RESERVED_NAME
+#define _S SYSTEM_RESERVED_NAME
+#define _T SYSTEM_RESERVED_NAME
+#define _U SYSTEM_RESERVED_NAME
+#define _V SYSTEM_RESERVED_NAME
+#define _W SYSTEM_RESERVED_NAME
+#define _X SYSTEM_RESERVED_NAME
+#define _Y SYSTEM_RESERVED_NAME
+#define _Z SYSTEM_RESERVED_NAME
+#endif
+
+// FreeBSD's <sys/types.h> uses _M
+//
+#ifdef __FreeBSD__
+# undef _M
+#endif
+
+// Test that libc++ doesn't use names that collide with FreeBSD system macros.
+// newlib and picolibc also define these macros
+#if !defined(__FreeBSD__) && !defined(_NEWLIB_VERSION)
+#  define __null_sentinel SYSTEM_RESERVED_NAME
+#  define __generic SYSTEM_RESERVED_NAME
+#endif
+
+// tchar.h defines these macros on Windows
+#ifndef _WIN32
+# define _UI   SYSTEM_RESERVED_NAME
+# define _PUC  SYSTEM_RESERVED_NAME
+# define _CPUC SYSTEM_RESERVED_NAME
+# define _PC   SYSTEM_RESERVED_NAME
+# define _CRPC SYSTEM_RESERVED_NAME
+# define _CPC  SYSTEM_RESERVED_NAME
+#endif
+
+// yvals.h on MINGW defines this macro
+#ifndef _WIN32
+# define _C2 SYSTEM_RESERVED_NAME
+#endif
+
+// Test that libc++ doesn't use names that collide with Win32 API macros.
+// Obviously we can only define these on non-Windows platforms.
+#ifndef _WIN32
+# define __allocator SYSTEM_RESERVED_NAME
+# define __bound SYSTEM_RESERVED_NAME
+# define __deallocate SYSTEM_RESERVED_NAME
+# define __deref SYSTEM_RESERVED_NAME
+# define __format_string SYSTEM_RESERVED_NAME
+# define __full SYSTEM_RESERVED_NAME
+# define __in SYSTEM_RESERVED_NAME
+# define __inout SYSTEM_RESERVED_NAME
+# define __nz SYSTEM_RESERVED_NAME
+# define __out SYSTEM_RESERVED_NAME
+# define __part SYSTEM_RESERVED_NAME
+# define __post SYSTEM_RESERVED_NAME
+# define __pre SYSTEM_RESERVED_NAME
+#endif
+
+// Newlib & picolibc use __input as a parameter name of a64l & l64a
+#ifndef _NEWLIB_VERSION
+# define __input SYSTEM_RESERVED_NAME
+#endif
+#define __output SYSTEM_RESERVED_NAME
+
+#define __acquire SYSTEM_RESERVED_NAME
+#define __release SYSTEM_RESERVED_NAME
+
+// Android and FreeBSD use this for __attribute__((__unused__))
+#if !defined(__FreeBSD__)  && !defined(__ANDROID__)
+#define __unused SYSTEM_RESERVED_NAME
+#endif
+
+// These names are not reserved, so the user can macro-define them.
+// These are intended to find improperly _Uglified template parameters.
+#define A SYSTEM_RESERVED_NAME
+#define Arg SYSTEM_RESERVED_NAME
+#define Args SYSTEM_RESERVED_NAME
+#define As SYSTEM_RESERVED_NAME
+#define B SYSTEM_RESERVED_NAME
+#define Bs SYSTEM_RESERVED_NAME
+#define C SYSTEM_RESERVED_NAME
+#define Cp SYSTEM_RESERVED_NAME
+#define Cs SYSTEM_RESERVED_NAME
+// Windows setjmp.h contains a struct member named 'D' on ARM/AArch64.
+#ifndef _WIN32
+# define D SYSTEM_RESERVED_NAME
+#endif
+#define Dp SYSTEM_RESERVED_NAME
+#define Ds SYSTEM_RESERVED_NAME
+#define E SYSTEM_RESERVED_NAME
+#define Ep SYSTEM_RESERVED_NAME
+#define Es SYSTEM_RESERVED_NAME
+#define N SYSTEM_RESERVED_NAME
+#define Np SYSTEM_RESERVED_NAME
+#define Ns SYSTEM_RESERVED_NAME
+#define R SYSTEM_RESERVED_NAME
+#define Rp SYSTEM_RESERVED_NAME
+#define Rs SYSTEM_RESERVED_NAME
+#define T SYSTEM_RESERVED_NAME
+#define Tp SYSTEM_RESERVED_NAME
+#define Ts SYSTEM_RESERVED_NAME
+#define Type SYSTEM_RESERVED_NAME
+#define Types SYSTEM_RESERVED_NAME
+#define U SYSTEM_RESERVED_NAME
+#define Up SYSTEM_RESERVED_NAME
+#define Us SYSTEM_RESERVED_NAME
+#define V SYSTEM_RESERVED_NAME
+#define Vp SYSTEM_RESERVED_NAME
+#define Vs SYSTEM_RESERVED_NAME
+#define X SYSTEM_RESERVED_NAME
+#define Xp SYSTEM_RESERVED_NAME
+#define Xs SYSTEM_RESERVED_NAME
+
+// The classic Windows min/max macros
+#define min SYSTEM_RESERVED_NAME
+#define max SYSTEM_RESERVED_NAME
+
+// Test to make sure curses has no conflicting macros with the standard library
+#define move SYSTEM_RESERVED_NAME
+#define erase SYSTEM_RESERVED_NAME
+#define refresh SYSTEM_RESERVED_NAME
+
+// Dinkumware libc ctype.h uses these definitions
+#define _XA SYSTEM_RESERVED_NAME
+#define _XS SYSTEM_RESERVED_NAME
+#define _BB SYSTEM_RESERVED_NAME
+#define _CN SYSTEM_RESERVED_NAME
+#define _DI SYSTEM_RESERVED_NAME
+#define _LO SYSTEM_RESERVED_NAME
+#define _PU SYSTEM_RESERVED_NAME
+#define _SP SYSTEM_RESERVED_NAME
+#define _UP SYSTEM_RESERVED_NAME
+#define _XD SYSTEM_RESERVED_NAME

clang/test/Headers/x86-intrinsics-headers-clean.cpp

@@ -10,4 +10,6 @@
 
 // expected-no-diagnostics
 
+#include "system_reserved_names.h"
+
 #include <x86intrin.h>

clang/test/Headers/x86-intrinsics-headers.c

@@ -5,6 +5,8 @@
 // XFAIL: target=arm64ec-pc-windows-msvc
 // These intrinsics are not yet implemented for Arm64EC.
 
+#include "system_reserved_names.h"
+
 #if defined(i386) || defined(__x86_64__)
 
 #ifdef __SSE4_2__