1 files changed, 8 insertions, 0 deletions

diff --git a/contrib/llvm-project/clang/lib/Frontend/InitPreprocessor.cpp b/contrib/llvm-project/clang/lib/Frontend/InitPreprocessor.cpp
index a9023a7a1171..e259ab47c558 100644
--- a/contrib/llvm-project/clang/lib/Frontend/InitPreprocessor.cpp
+++ b/contrib/llvm-project/clang/lib/Frontend/InitPreprocessor.cpp
@@ -25,6 +25,7 @@
 #include "clang/Serialization/ASTReader.h"
 #include "llvm/ADT/APFloat.h"
 #include "llvm/IR/DataLayout.h"
+#include "llvm/IR/DerivedTypes.h"
 using namespace clang;
 
 static bool MacroBodyEndsInBackslash(StringRef MacroBody) {
@@ -914,6 +915,13 @@ static void InitializePredefinedMacros(const TargetInfo &TI,
   Builder.defineMacro("__LONG_WIDTH__", Twine(TI.getLongWidth()));
   Builder.defineMacro("__LLONG_WIDTH__", Twine(TI.getLongLongWidth()));
 
+  size_t BitIntMaxWidth = TI.getMaxBitIntWidth();
+  assert(BitIntMaxWidth <= llvm::IntegerType::MAX_INT_BITS &&
+         "Target defined a max bit width larger than LLVM can support!");
+  assert(BitIntMaxWidth >= TI.getLongLongWidth() &&
+         "Target defined a max bit width smaller than the C standard allows!");
+  Builder.defineMacro("__BITINT_MAXWIDTH__", Twine(BitIntMaxWidth));
+
   DefineTypeSize("__SCHAR_MAX__", TargetInfo::SignedChar, TI, Builder);
   DefineTypeSize("__SHRT_MAX__", TargetInfo::SignedShort, TI, Builder);
   DefineTypeSize("__INT_MAX__", TargetInfo::SignedInt, TI, Builder);