diff options
Diffstat (limited to 'llvm/cmake/modules/HandleLLVMOptions.cmake')
| -rw-r--r-- | llvm/cmake/modules/HandleLLVMOptions.cmake | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake index 4c5ffe2f7b2..6db258ff66a 100644 --- a/llvm/cmake/modules/HandleLLVMOptions.cmake +++ b/llvm/cmake/modules/HandleLLVMOptions.cmake @@ -363,6 +363,36 @@ if( MSVC ) append("/Zc:inline" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) + if (NOT LLVM_ENABLE_TIMESTAMPS AND CMAKE_CXX_COMPILER_ID MATCHES "Clang") + # clang-cl and cl by default produce non-deterministic binaries because + # link.exe /incremental requires a timestamp in the .obj file. clang-cl + # has the flag /Brepro to force deterministic binaries, so pass that when + # LLVM_ENABLE_TIMESTAMPS is turned off. + # This checks CMAKE_CXX_COMPILER_ID in addition to check_cxx_compiler_flag() + # because cl.exe does not emit an error on flags it doesn't understand, + # letting check_cxx_compiler_flag() claim it understands all flags. + check_cxx_compiler_flag("/Brepro" SUPPORTS_BREPRO) + append_if(SUPPORTS_BREPRO "/Brepro" CMAKE_C_FLAGS CMAKE_CXX_FLAGS) + + if (SUPPORTS_BREPRO) + # Check if /INCREMENTAL is passed to the linker and complain that it + # won't work with /Brepro. + string(TOUPPER "${CMAKE_EXE_LINKER_FLAGS}" upper_exe_flags) + string(TOUPPER "${CMAKE_MODULE_LINKER_FLAGS}" upper_module_flags) + string(TOUPPER "${CMAKE_SHARED_LINKER_FLAGS}" upper_shared_flags) + + string(FIND "${upper_exe_flags}" "/INCREMENTAL" exe_index) + string(FIND "${upper_module_flags}" "/INCREMENTAL" module_index) + string(FIND "${upper_shared_flags}" "/INCREMENTAL" shared_index) + + if (${exe_index} GREATER -1 OR + ${module_index} GREATER -1 OR + ${shared_index} GREATER -1) + message(FATAL_ERROR "LLVM_ENABLE_TIMESTAMPS not compatible with /INCREMENTAL linking") + endif() + endif() + endif() + # Disable sized deallocation if the flag is supported. MSVC fails to compile # the operator new overload in User otherwise. check_c_compiler_flag("/WX /Zc:sizedDealloc-" SUPPORTS_SIZED_DEALLOC) |
