llvmbot wrote:

<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: None (jeremyd2019)

<details>
<summary>Changes</summary>

GCC on Cygwin and MSYS2 are built with --enable-__cxa_atexit.

Adjust test to expect this change.

/cc @<!-- -->mstrosjo @<!-- -->mati865 

---
Full diff: https://github.com/llvm/llvm-project/pull/135701.diff


2 Files Affected:

- (modified) clang/lib/Driver/ToolChains/Clang.cpp (+2-1) 
- (modified) clang/test/Driver/cxa-atexit.cpp (+4-3) 


``````````diff
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp 
b/clang/lib/Driver/ToolChains/Clang.cpp
index 13b7b94424999..aa8954804b48b 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -7230,7 +7230,8 @@ void Clang::ConstructJob(Compilation &C, const JobAction 
&JA,
   // -fuse-cxa-atexit is default.
   if (!Args.hasFlag(
           options::OPT_fuse_cxa_atexit, options::OPT_fno_use_cxa_atexit,
-          !RawTriple.isOSAIX() && !RawTriple.isOSWindows() &&
+          !RawTriple.isOSAIX() && (!RawTriple.isOSWindows() ||
+                RawTriple.isWindowsCygwinEnvironment()) &&
               ((RawTriple.getVendor() != llvm::Triple::MipsTechnologies) ||
                RawTriple.hasEnvironment())) ||
       KernelOrKext)
diff --git a/clang/test/Driver/cxa-atexit.cpp b/clang/test/Driver/cxa-atexit.cpp
index 537a11a35f51b..8bfb938e8e8e7 100644
--- a/clang/test/Driver/cxa-atexit.cpp
+++ b/clang/test/Driver/cxa-atexit.cpp
@@ -1,15 +1,15 @@
 // RUN: %clang -### -target armv7-unknown-windows-msvc -c %s -o /dev/null 2>&1 
| FileCheck %s -check-prefix CHECK-WINDOWS
 // RUN: %clang -### -target armv7-unknown-windows-itanium -c %s -o /dev/null 
2>&1 | FileCheck %s -check-prefix CHECK-WINDOWS
 // RUN: %clang -### -target armv7-unknown-windows-gnu -c %s -o /dev/null 2>&1 
| FileCheck %s -check-prefix CHECK-WINDOWS
-// RUN: %clang -### -target armv7-unknown-windows-cygnus -c %s -o /dev/null 
2>&1 | FileCheck %s -check-prefix CHECK-WINDOWS
+// RUN: %clang -### -target armv7-unknown-windows-cygnus -c %s -o /dev/null 
2>&1 | FileCheck %s -check-prefix CHECK-CYGWIN
 // RUN: %clang -### -target i686-unknown-windows-msvc -c %s -o /dev/null 2>&1 
| FileCheck %s -check-prefix CHECK-WINDOWS
 // RUN: %clang -### -target i686-unknown-windows-itanium -c %s -o /dev/null 
2>&1 | FileCheck %s -check-prefix CHECK-WINDOWS
 // RUN: %clang -### -target i686-unknown-windows-gnu -c %s -o /dev/null 2>&1 | 
FileCheck %s -check-prefix CHECK-WINDOWS
-// RUN: %clang -### -target i686-unknown-windows-cygnus -c %s -o /dev/null 
2>&1 | FileCheck %s -check-prefix CHECK-WINDOWS
+// RUN: %clang -### -target i686-unknown-windows-cygnus -c %s -o /dev/null 
2>&1 | FileCheck %s -check-prefix CHECK-CYGWIN
 // RUN: %clang -### -target x86_64-unknown-windows-msvc -c %s -o /dev/null 
2>&1 | FileCheck %s -check-prefix CHECK-WINDOWS
 // RUN: %clang -### -target x86_64-unknown-windows-itanium -c %s -o /dev/null 
2>&1 | FileCheck %s -check-prefix CHECK-WINDOWS
 // RUN: %clang -### -target x86_64-unknown-windows-gnu -c %s -o /dev/null 2>&1 
| FileCheck %s -check-prefix CHECK-WINDOWS
-// RUN: %clang -### -target x86_64-unknown-windows-cygnus -c %s -o /dev/null 
2>&1 | FileCheck %s -check-prefix CHECK-WINDOWS
+// RUN: %clang -### -target x86_64-unknown-windows-cygnus -c %s -o /dev/null 
2>&1 | FileCheck %s -check-prefix CHECK-CYGWIN
 // RUN: %clang -### -target hexagon-unknown-none -c %s -o /dev/null 2>&1 | 
FileCheck %s -check-prefix CHECK-HEXAGON
 // RUN: %clang -### -target xcore-unknown-none -c %s -o /dev/null 2>&1 | 
FileCheck %s -check-prefix CHECK-XCORE
 // RUN: %clang -### -target armv7-mti-none -c %s -o /dev/null 2>&1 | FileCheck 
%s -check-prefix CHECK-MTI
@@ -21,6 +21,7 @@
 // RUN: %clang -### -target powerpc64-ibm-aix-xcoff -c %s -o /dev/null 2>&1 | 
FileCheck %s -check-prefix CHECK-AIX
 
 // CHECK-WINDOWS: "-fno-use-cxa-atexit"
+// CHECK-CYGWIN-NOT: "-fno-use-cxa-atexit"
 // CHECK-SOLARIS-NOT: "-fno-use-cxa-atexit"
 // CHECK-HEXAGON-NOT: "-fno-use-cxa-atexit"
 // CHECK-XCORE: "-fno-use-cxa-atexit"

``````````

</details>


https://github.com/llvm/llvm-project/pull/135701
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