[Clang][Cygwin] Use correct mangling rule #158404
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@llvm/pr-subscribers-clang Author: Tomohiro Kashiwada (kikairoya) Changesfollow-up to 45ca613 Full diff: https://github.com/llvm/llvm-project/pull/158404.diff 2 Files Affected:
diff --git a/clang/lib/Basic/Targets/X86.h b/clang/lib/Basic/Targets/X86.h
index 6e013c95dbf01..d159a7906854c 100644
--- a/clang/lib/Basic/Targets/X86.h
+++ b/clang/lib/Basic/Targets/X86.h
@@ -646,6 +646,7 @@ 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",
@@ -983,6 +984,7 @@ 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-{{.*}}"
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Consider also updating clang/test/CodeGenCXX/mangle-windows.cpp to add i386-cygwin with ITANIUM prefix? |
jeremyd2019
approved these changes
Sep 13, 2025
There was a problem hiding this comment.
LGTM. @mstorsjo I believe this is a regression from 20.1.x (the commit cited only appears with llvm 21 tags), does that make this eligible for cherry-picking to 21.x?
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The description could use some improvement. How about something like
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follow-up to 45ca613