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

[Eugene Zelenko via llvm-commits]

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