[llvm] r277093 - Add LLVM_ENABLE_LLD option to use LLD as C/C++ linker.

[Hans Wennborg via llvm-commits]

Saleem: Ping?

On Tue, Aug 2, 2016 at 10:54 AM, Hans Wennborg <hans at chromium.org> wrote:
> Eugene has asked that this be merged to 3.9. Saleem, what do you think?
>
> Thanks,
> Hans
>
> On Thu, Jul 28, 2016 at 5:46 PM, Eugene Zelenko via llvm-commits
> <llvm-commits at lists.llvm.org> wrote:
>> Author: eugenezelenko
>> Date: Thu Jul 28 19:46:13 2016
>> New Revision: 277093
>>
>> URL: http://llvm.org/viewvc/llvm-project?rev=277093&view=rev
>> Log:
>> Add LLVM_ENABLE_LLD option to use LLD as C/C++ linker.
>>
>> Differential revision: https://reviews.llvm.org/D22896
>>
>> Modified:
>>     llvm/trunk/CMakeLists.txt
>>     llvm/trunk/cmake/modules/HandleLLVMOptions.cmake
>>
>> Modified: llvm/trunk/CMakeLists.txt
>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/CMakeLists.txt?rev=277093&r1=277092&r2=277093&view=diff
>> ==============================================================================
>> --- llvm/trunk/CMakeLists.txt (original)
>> +++ llvm/trunk/CMakeLists.txt Thu Jul 28 19:46:13 2016
>> @@ -317,6 +317,7 @@ endif()
>>  option(LLVM_ENABLE_CXX1Y "Compile with C++1y enabled." OFF)
>>  option(LLVM_ENABLE_LIBCXX "Use libc++ if available." OFF)
>>  option(LLVM_ENABLE_LIBCXXABI "Use libc++abi when using libc++." OFF)
>> +option(LLVM_ENABLE_LLD "Use lld as C and C++ linker." OFF)
>>  option(LLVM_ENABLE_PEDANTIC "Compile with pedantic enabled." ON)
>>  option(LLVM_ENABLE_WERROR "Fail and stop if a warning is triggered." OFF)
>>
>>
>> Modified: llvm/trunk/cmake/modules/HandleLLVMOptions.cmake
>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/cmake/modules/HandleLLVMOptions.cmake?rev=277093&r1=277092&r2=277093&view=diff
>> ==============================================================================
>> --- llvm/trunk/cmake/modules/HandleLLVMOptions.cmake (original)
>> +++ llvm/trunk/cmake/modules/HandleLLVMOptions.cmake Thu Jul 28 19:46:13 2016
>> @@ -144,6 +144,12 @@ function(add_flag_or_print_warning flag
>>    endif()
>>  endfunction()
>>
>> +if(LLVM_ENABLE_LLD)
>> +  check_cxx_compiler_flag("-fuse-ld=lld" CXX_SUPPORTS_LLD)
>> +  append_if(CXX_SUPPORTS_LLD "-fuse-ld=lld"
>> +    CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
>> +endif()
>> +
>>  if( LLVM_ENABLE_PIC )
>>    if( XCODE )
>>      # Xcode has -mdynamic-no-pic on by default, which overrides -fPIC. I don't