Author: Mateusz Mikuła
Date: 2025-05-02T11:01:37+03:00
New Revision: 592243c1cb3ea53b34033132a87b0d14af9d1079

URL: 
https://github.com/llvm/llvm-project/commit/592243c1cb3ea53b34033132a87b0d14af9d1079
DIFF: 
https://github.com/llvm/llvm-project/commit/592243c1cb3ea53b34033132a87b0d14af9d1079.diff

LOG: [Clang][Cygwin] Fix symbol visibility definition (#138118)

Currently building for Cygwin hits this error:
```
In file included from 
/h/projects/llvm-project/clang/lib/Basic/Attributes.cpp:17:
/h/projects/llvm-project/clang/include/clang/Basic/ParsedAttrInfo.h:180:73: 
error: invalid declarator before ‘;’ token
  180 | extern template class CLANG_TEMPLATE_ABI 
Registry<clang::ParsedAttrInfo>;
```
That's because `CLANG_TEMPLATE_ABI` ends up not being defined. The
solution here is to follow MinGW case.

Added: 
    

Modified: 
    clang/include/clang/Support/Compiler.h

Removed: 
    


################################################################################
diff  --git a/clang/include/clang/Support/Compiler.h 
b/clang/include/clang/Support/Compiler.h
index 5a74f8e3b6723..e1ae3eda4ccc2 100644
--- a/clang/include/clang/Support/Compiler.h
+++ b/clang/include/clang/Support/Compiler.h
@@ -50,7 +50,7 @@
 #define CLANG_EXPORT_TEMPLATE
 #endif
 #elif defined(__ELF__) || defined(__MINGW32__) || defined(_AIX) ||             
\
-    defined(__MVS__)
+    defined(__MVS__) || defined(__CYGWIN__)
 #define CLANG_ABI LLVM_ATTRIBUTE_VISIBILITY_DEFAULT
 #define CLANG_TEMPLATE_ABI LLVM_ATTRIBUTE_VISIBILITY_DEFAULT
 #define CLANG_EXPORT_TEMPLATE


        
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