[clang] [libclang][Cygwin] Use LLVM_EXPORTED_SYMBOL_FILE (*.def file) for Cygwin (PR #147278)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Tomohiro Kashiwada (kikairoya)

<details>
<summary>Changes</summary>

This is not mandatory but recommended for completeness and consistency with MinGW.

---
Full diff: https://github.com/llvm/llvm-project/pull/147278.diff


1 Files Affected:

- (modified) clang/tools/libclang/CMakeLists.txt (+1-1) 


``````````diff
diff --git a/clang/tools/libclang/CMakeLists.txt b/clang/tools/libclang/CMakeLists.txt
index ac7a9a8db37c0..b6662b66206b2 100644
--- a/clang/tools/libclang/CMakeLists.txt
+++ b/clang/tools/libclang/CMakeLists.txt
@@ -92,7 +92,7 @@ if(MSVC)
   set(LLVM_EXPORTED_SYMBOL_FILE)
 endif()
 
-if (UNIX AND NOT APPLE AND NOT ${CMAKE_SYSTEM_NAME} MATCHES "AIX")
+if (UNIX AND NOT APPLE AND NOT ${CMAKE_SYSTEM_NAME} MATCHES "AIX" AND NOT CYGWIN)
   set(LLVM_EXPORTED_SYMBOL_FILE)
   set(USE_VERSION_SCRIPT ${LLVM_HAVE_LINK_VERSION_SCRIPT})
 endif()

``````````

</details>


https://github.com/llvm/llvm-project/pull/147278