[clang] [clang] Fix name conflict with `sys/mac.h` on AIX (PR #88644)

[Vlad Serebrennikov via cfe-commits]

https://github.com/Endilll created https://github.com/llvm/llvm-project/pull/88644

Fixes clang-ppc64-aix bot failure after #88559 (0a6f6df5b0c3d0f2a42f013bf5cafb9b5020dcac) https://lab.llvm.org/buildbot/#/builders/214/builds/11887

>From 9d46b1ed31d2acbb772f9bb4b139fa1ec36a65ab Mon Sep 17 00:00:00 2001
From: Vlad Serebrennikov <serebrennikov.vladislav at gmail.com>
Date: Sun, 14 Apr 2024 08:46:27 +0300
Subject: [PATCH] [clang] Fix name conflict with `sys/mac.h` on AIX

Fixes clang-ppc64-aix bot failure after #88559 (0a6f6df5b0c3d0f2a42f013bf5cafb9b5020dcac) https://lab.llvm.org/buildbot/#/builders/214/builds/11887
---
 clang/include/clang/Basic/Cuda.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/clang/include/clang/Basic/Cuda.h b/clang/include/clang/Basic/Cuda.h
index acc6bb6581d857..3908e10bc61061 100644
--- a/clang/include/clang/Basic/Cuda.h
+++ b/clang/include/clang/Basic/Cuda.h
@@ -50,6 +50,11 @@ const char *CudaVersionToString(CudaVersion V);
 // Input is "Major.Minor"
 CudaVersion CudaStringToVersion(const llvm::Twine &S);
 
+// We have a name conflict with sys/mac.h on AIX
+#ifdef _AIX
+#undef SM_32
+#endif
+
 enum class CudaArch {
   UNUSED,
   UNKNOWN,