[libcxx-commits] [libcxxabi] [libc++abi] Provide an explicit error when trying to build for MSVC (PR #119370)

[via libcxx-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libcxxabi

Author: Louis Dionne (ldionne)

<details>
<summary>Changes</summary>

Fixes #<!-- -->119322

---
Full diff: https://github.com/llvm/llvm-project/pull/119370.diff


1 Files Affected:

- (modified) libcxxabi/CMakeLists.txt (+5) 


``````````diff
diff --git a/libcxxabi/CMakeLists.txt b/libcxxabi/CMakeLists.txt
index da0e8b286cddc1..158d61ff4fcb25 100644
--- a/libcxxabi/CMakeLists.txt
+++ b/libcxxabi/CMakeLists.txt
@@ -34,6 +34,11 @@ MACRO_ENSURE_OUT_OF_SOURCE_BUILD(
  build directory and run 'cmake /path/to/${PROJECT_NAME} [options]' there."
  )
 
+if (MSVC)
+  message(FATAL_ERROR "Libc++abi can't be built for MSVC targets, and doing so is pointless anyway because such "
+                      "targets must use the MS C++ ABI, and libc++abi provides the Itanium C++ ABI.")
+endif()
+
 #===============================================================================
 # Setup CMake Options
 #===============================================================================

``````````

</details>


https://github.com/llvm/llvm-project/pull/119370