release/21.x: [Clang][Cygwin] Use correct mangling rule (#158404) #158442
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In llvm@45ca613, whether to mangle names based on calling conventions according to Microsoft conventions was refactored to a bool in the TargetInfo. Cygwin targets also require this mangling, but were missed, presumably due to lack of test coverage of these targets. This commit enables the name mangling for Cygwin, and also enables test coverage of this mangling on Cygwin targets. (cherry picked from commit 4abcbb0)
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@jeremyd2019 What do you think about merging this PR to the release branch? |
llvmbot
added
clang
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@llvm/pr-subscribers-clang Author: None (llvmbot) ChangesBackport 4abcbb0 Requested by: @mstorsjo Full diff: https://github.com/llvm/llvm-project/pull/158442.diff 3 Files Affected:
diff --git a/clang/lib/Basic/Targets/X86.h b/clang/lib/Basic/Targets/X86.h
index ebc59c92f4c24..a7be080695ed3 100644
--- a/clang/lib/Basic/Targets/X86.h
+++ b/clang/lib/Basic/Targets/X86.h
@@ -649,6 +649,7 @@ class LLVM_LIBRARY_VISIBILITY CygwinX86_32TargetInfo : public X86_32TargetInfo {
: X86_32TargetInfo(Triple, Opts) {
this->WCharType = TargetInfo::UnsignedShort;
this->WIntType = TargetInfo::UnsignedInt;
+ this->UseMicrosoftManglingForC = true;
DoubleAlign = LongLongAlign = 64;
resetDataLayout("e-m:x-p:32:32-p270:32:32-p271:32:32-p272:64:64-i64:64-"
"i128:128-f80:32-n8:16:32-a:0:32-S32",
@@ -986,6 +987,7 @@ class LLVM_LIBRARY_VISIBILITY CygwinX86_64TargetInfo : public X86_64TargetInfo {
: X86_64TargetInfo(Triple, Opts) {
this->WCharType = TargetInfo::UnsignedShort;
this->WIntType = TargetInfo::UnsignedInt;
+ this->UseMicrosoftManglingForC = true;
}
void getTargetDefines(const LangOptions &Opts,
diff --git a/clang/test/CodeGen/mangle-windows.c b/clang/test/CodeGen/mangle-windows.c
index 046b1e8815a8a..e1b06e72a9635 100644
--- a/clang/test/CodeGen/mangle-windows.c
+++ b/clang/test/CodeGen/mangle-windows.c
@@ -1,8 +1,10 @@
// RUN: %clang_cc1 -emit-llvm %s -o - -triple=i386-pc-win32 | FileCheck %s
-// RUN: %clang_cc1 -emit-llvm %s -o - -triple=i386-mingw32 | FileCheck %s
+// RUN: %clang_cc1 -emit-llvm %s -o - -triple=i386-mingw32 | FileCheck %s
+// RUN: %clang_cc1 -emit-llvm %s -o - -triple=i386-cygwin | FileCheck %s
// RUN: %clang_cc1 -emit-llvm %s -o - -triple=i386-pc-windows-msvc-elf | FileCheck %s --check-prefix=ELF32
// RUN: %clang_cc1 -emit-llvm %s -o - -triple=x86_64-pc-win32 | FileCheck %s --check-prefix=X64
-// RUN: %clang_cc1 -emit-llvm %s -o - -triple=x86_64-mingw32 | FileCheck %s --check-prefix=X64
+// RUN: %clang_cc1 -emit-llvm %s -o - -triple=x86_64-mingw32 | FileCheck %s --check-prefix=X64
+// RUN: %clang_cc1 -emit-llvm %s -o - -triple=x86_64-cygwin | FileCheck %s --check-prefix=X64
// RUN: %clang_cc1 -emit-llvm %s -o - -triple=x86_64-pc-windows-msvc-elf | FileCheck %s --check-prefix=ELF64
// CHECK: target datalayout = "e-m:x-{{.*}}"
diff --git a/clang/test/CodeGenCXX/mangle-windows.cpp b/clang/test/CodeGenCXX/mangle-windows.cpp
index 3d5a1e9a868ef..737abcf6e3498 100644
--- a/clang/test/CodeGenCXX/mangle-windows.cpp
+++ b/clang/test/CodeGenCXX/mangle-windows.cpp
@@ -4,6 +4,9 @@
// RUN: %clang_cc1 -emit-llvm %s -o - -triple=i386-mingw32 | \
// RUN: FileCheck --check-prefix=ITANIUM %s
+// RUN: %clang_cc1 -emit-llvm %s -o - -triple=i386-cygwin | \
+// RUN: FileCheck --check-prefix=ITANIUM %s
+
void __stdcall f1(void) {}
// WIN: define dso_local x86_stdcallcc void @"?f1@@YGXXZ"
// ITANIUM: define dso_local x86_stdcallcc void @"\01__Z2f1v@0"
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jeremyd2019
approved these changes
Sep 13, 2025
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@mstorsjo (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix. When you are done, please add the release:note label to this PR. |
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Backport 4abcbb0
Requested by: @mstorsjo