[PATCH] D22896: [LLVM] Add LLVM_ENABLE_LLD option to use LLD as C/C++ linker.

[Eugene Zelenko via llvm-commits]

Eugene.Zelenko updated this revision to Diff 66060.
Eugene.Zelenko added a comment.

Also use LLD for CMAKE_MODULE_LINKER_FLAGS.


Repository:
  rL LLVM

https://reviews.llvm.org/D22896

Files:
  CMakeLists.txt
  cmake/modules/HandleLLVMOptions.cmake

Index: cmake/modules/HandleLLVMOptions.cmake
===================================================================
--- cmake/modules/HandleLLVMOptions.cmake
+++ cmake/modules/HandleLLVMOptions.cmake
@@ -12,7 +12,6 @@
 include(CheckCCompilerFlag)
 include(CheckCXXCompilerFlag)
 
-
 if (CMAKE_LINKER MATCHES "lld-link.exe")
   # Pass /MANIFEST:NO so that CMake doesn't run mt.exe on our binaries.  Adding
   # manifests with mt.exe breaks LLD's symbol tables and takes as much time as
@@ -109,7 +108,6 @@
   set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,defs")
 endif()
 
-
 function(append value)
   foreach(variable ${ARGN})
     set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
@@ -144,6 +142,12 @@
   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
Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -317,6 +317,7 @@
 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)
 


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