[clang] [compiler-rt] Define signed int overflow with -fms-compatibility (PR #198538)

[Aaron Ballman via cfe-commits]

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@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 -emit-llvm %s -o - | FileCheck %s --check-prefix=NOWRAP
+// RUN: %clang_cc1 -fno-wrapv -emit-llvm %s -o - | FileCheck %s --check-prefix=NOWRAP
+// RUN: %clang_cc1 -fno-wrapv -fms-compatibility -emit-llvm %s -o - | FileCheck %s --check-prefix=NOWRAP
+// RUN: %clang_cc1 -fwrapv -emit-llvm %s -o - | FileCheck %s --check-prefix=WRAP
+// RUN: %clang_cc1 -fms-compatibility -emit-llvm %s -o - | FileCheck %s --check-prefix=WRAP
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AaronBallman wrote:

Thanks for checking! I'd say we can add it as a test case and document the behavior.

https://github.com/llvm/llvm-project/pull/198538