[llvm] acc15fb - [CMake][LLVM] Disable PCH on MSVC for file with custom flags

[Alexis Engelke via llvm-commits]

Author: Alexis Engelke
Date: 2026-02-20T15:01:40Z
New Revision: acc15fbce100e941f028f52d7774cab130df9714

URL: https://github.com/llvm/llvm-project/commit/acc15fbce100e941f028f52d7774cab130df9714
DIFF: https://github.com/llvm/llvm-project/commit/acc15fbce100e941f028f52d7774cab130df9714.diff

LOG: [CMake][LLVM] Disable PCH on MSVC for file with custom flags

See: https://github.com/llvm/llvm-project/pull/176420

Added: 
    

Modified: 
    llvm/lib/Analysis/CMakeLists.txt

Removed: 
    


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diff  --git a/llvm/lib/Analysis/CMakeLists.txt b/llvm/lib/Analysis/CMakeLists.txt
index 9abdca099d9fe..33ed56624f40f 100644
--- a/llvm/lib/Analysis/CMakeLists.txt
+++ b/llvm/lib/Analysis/CMakeLists.txt
@@ -30,6 +30,8 @@ endif()
 # handled correctly.
 if (MSVC)
   set_source_files_properties(ConstantFolding.cpp PROPERTIES COMPILE_OPTIONS "/fp:except")
+  # Prevent warning about mismatching compile flags.
+  set_source_files_properties(ConstantFolding.cpp PROPERTIES SKIP_PRECOMPILE_HEADERS ON)
 elseif(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
   set_source_files_properties(ConstantFolding.cpp PROPERTIES COMPILE_OPTIONS "-ftrapping-math")
 endif()