[llvm-branch-commits] [llvm] fdd3e7c - [llvm][cmake] Pass /Brepro to linker (#201708)

[via llvm-branch-commits]

Author: Miguel A. Arroyo
Date: 2026-06-05T08:53:46-07:00
New Revision: fdd3e7cae11fff30a33af79a8814db9c72d5179b

URL: https://github.com/llvm/llvm-project/commit/fdd3e7cae11fff30a33af79a8814db9c72d5179b
DIFF: https://github.com/llvm/llvm-project/commit/fdd3e7cae11fff30a33af79a8814db9c72d5179b.diff

LOG: [llvm][cmake] Pass /Brepro to linker (#201708)

* The /Brepro flag should also be passed to the linker. The `BUILD.gn`
correctly does
[this](https://github.com/llvm/llvm-project/blob/70f7167ce2622a610a6d6dca4d5934ea8a07a056/llvm/utils/gn/build/BUILD.gn#L332).
* The /Brepro flag in `clang-cl` omits the timestamp for .obj files
while the linker flag omits the timestamp for .exe and .dll files.

Added: 
    

Modified: 
    llvm/cmake/modules/HandleLLVMOptions.cmake

Removed: 
    


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diff  --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
index 75bd8ed11e1ba..e14fd9e931810 100644
--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
+++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -700,7 +700,8 @@ if( MSVC )
     has_msvc_incremental_no_flag("${CMAKE_MODULE_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${CMAKE_MODULE_LINKER_FLAGS}" NO_INCR_MODULE)
     has_msvc_incremental_no_flag("${CMAKE_SHARED_LINKER_FLAGS_${uppercase_CMAKE_BUILD_TYPE}} ${CMAKE_SHARED_LINKER_FLAGS}" NO_INCR_SHARED)
     if (NO_INCR_EXE AND NO_INCR_MODULE AND NO_INCR_SHARED)
-      append("/Brepro" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
+      # The /Brepro flag in `clang-cl` omits the timestamp for .obj files while the linker flag omits the timestamp for .exe and .dll files.
+      append("/Brepro" CMAKE_C_FLAGS CMAKE_CXX_FLAGS CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
     else()
       message(WARNING "/Brepro not compatible with /INCREMENTAL linking - builds will be non-deterministic")
     endif()