[clang] [llvm] [Support] Fix visibility macro guard: __WASM__ is never defined (PR #215665)

[Derek Schuff via llvm-commits]

https://github.com/dschuff updated https://github.com/llvm/llvm-project/pull/215665

>From 7fa39a8edfed8cf16981bdac1759dbc94939b132 Mon Sep 17 00:00:00 2001
From: JohnnyAnliZ <zal1718500340 at gmail.com>
Date: Tue, 11 Aug 2026 16:49:49 -0400
Subject: [PATCH] [Support] Fix visibility macro guard: __WASM__ is never
 defined The CLANG_ABI/LLVM_ABI visibility branches test defined __WASM__, but
 clang predefines lowercase __wasm__ for WebAssembly targets. __WASM__ doesn't
 exist, so this branch never fire for pure-WASI builds.

---
 clang/include/clang/Support/Compiler.h | 2 +-
 llvm/include/llvm/Support/Compiler.h   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/clang/include/clang/Support/Compiler.h b/clang/include/clang/Support/Compiler.h
index d7f7a0b092fbb..66d6c5b30e7b7 100644
--- a/clang/include/clang/Support/Compiler.h
+++ b/clang/include/clang/Support/Compiler.h
@@ -62,7 +62,7 @@
 #define CLANG_ABI_EXPORT LLVM_ATTRIBUTE_VISIBILITY_DEFAULT
 #define CLANG_TEMPLATE_ABI LLVM_ATTRIBUTE_VISIBILITY_DEFAULT
 #define CLANG_EXPORT_TEMPLATE
-#elif defined(__MACH__) || defined(__WASM__) || defined(__EMSCRIPTEN__)
+#elif defined(__MACH__) || defined(__wasm__) || defined(__EMSCRIPTEN__)
 #define CLANG_ABI LLVM_ATTRIBUTE_VISIBILITY_DEFAULT
 #define CLANG_ABI_EXPORT LLVM_ATTRIBUTE_VISIBILITY_DEFAULT
 #define CLANG_TEMPLATE_ABI
diff --git a/llvm/include/llvm/Support/Compiler.h b/llvm/include/llvm/Support/Compiler.h
index f9dc2e8d45c4d..33ea019a87be5 100644
--- a/llvm/include/llvm/Support/Compiler.h
+++ b/llvm/include/llvm/Support/Compiler.h
@@ -203,7 +203,7 @@
 #define LLVM_TEMPLATE_ABI LLVM_ABI
 #define LLVM_EXPORT_TEMPLATE
 #define LLVM_ABI_EXPORT LLVM_ABI
-#elif defined(__MACH__) || defined(__WASM__) || defined(__EMSCRIPTEN__)
+#elif defined(__MACH__) || defined(__wasm__) || defined(__EMSCRIPTEN__)
 #define LLVM_ABI __attribute__((visibility("default")))
 #define LLVM_TEMPLATE_ABI
 #define LLVM_EXPORT_TEMPLATE