https://github.com/pcc created https://github.com/llvm/llvm-project/pull/153888
Per discussion with @ojhunt and @AaronBallman we are moving towards
predefined macros and away from __has_feature and __has_extension for
detecting sanitizers and other similar features. Let's start by defining
macros for ASan, HWASan and TSan, consistently with gcc.
>From f7e8badf327c2328c548ccdf186fd09f735d4b5c Mon Sep 17 00:00:00 2001
From: Peter Collingbourne <pe...@pcc.me.uk>
Date: Fri, 15 Aug 2025 15:18:48 -0700
Subject: [PATCH] =?UTF-8?q?[=F0=9D=98=80=F0=9D=97=BD=F0=9D=97=BF]=20initia?=
=?UTF-8?q?l=20version?=
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Created using spr 1.3.6-beta.1
---
clang/lib/Frontend/InitPreprocessor.cpp | 7 +++++++
clang/test/Preprocessor/sanitizer-predefines.c | 8 ++++++++
2 files changed, 15 insertions(+)
create mode 100644 clang/test/Preprocessor/sanitizer-predefines.c
diff --git a/clang/lib/Frontend/InitPreprocessor.cpp
b/clang/lib/Frontend/InitPreprocessor.cpp
index 008a35d5265e1..81d798d8e27c6 100644
--- a/clang/lib/Frontend/InitPreprocessor.cpp
+++ b/clang/lib/Frontend/InitPreprocessor.cpp
@@ -1519,6 +1519,13 @@ static void InitializePredefinedMacros(const TargetInfo
&TI,
if (TI.getTriple().isOSBinFormatELF())
Builder.defineMacro("__ELF__");
+ if (LangOpts.Sanitize.has(SanitizerKind::Address))
+ Builder.defineMacro("__SANITIZE_ADDRESS__");
+ if (LangOpts.Sanitize.has(SanitizerKind::HWAddress))
+ Builder.defineMacro("__SANITIZE_HWADDRESS__");
+ if (LangOpts.Sanitize.has(SanitizerKind::Thread))
+ Builder.defineMacro("__SANITIZE_THREAD__");
+
// Target OS macro definitions.
if (PPOpts.DefineTargetOSMacros) {
const llvm::Triple &Triple = TI.getTriple();
diff --git a/clang/test/Preprocessor/sanitizer-predefines.c
b/clang/test/Preprocessor/sanitizer-predefines.c
new file mode 100644
index 0000000000000..9d2f6bf2517a2
--- /dev/null
+++ b/clang/test/Preprocessor/sanitizer-predefines.c
@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 -E -dM -triple aarch64-unknown-linux -fsanitize=address %s
| FileCheck %s --check-prefix=ASAN
+// ASAN: #define __SANITIZE_ADDRESS__ 1
+
+// RUN: %clang_cc1 -E -dM -triple aarch64-unknown-linux -fsanitize=hwaddress
%s | FileCheck %s --check-prefix=HWASAN
+// HWASAN: #define __SANITIZE_HWADDRESS__ 1
+
+// RUN: %clang_cc1 -E -dM -triple aarch64-unknown-linux -fsanitize=thread %s |
FileCheck %s --check-prefix=TSAN
+// TSAN: #define __SANITIZE_THREAD__ 1
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