From 68027c4618270e93bc8627e78a82557fca9a7bab Mon Sep 17 00:00:00 2001
From: NAKAMURA Takumi <geek4civic@gmail.com>
Date: Thu, 27 Aug 2015 16:10:47 +0000
Subject: [PATCH] [CMake] OBJLIB-ize *-tblgen.

This improves dependency chain of;

  (LLVMSupport && LLVMTableGen) && (*.cpp in *-tblgen) && (linking *-tblgen)

with;

  (LLVMSupport && LLVMTableGen && *.cpp) && (linking *-tblgen)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@246156 91177308-0d34-0410-b5e6-96231b3b80d8
---
 cmake/modules/AddLLVM.cmake  | 13 +++++++++++++
 cmake/modules/TableGen.cmake |  4 ++++
 2 files changed, 17 insertions(+)

diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
index 59c46f812c6..2e22077e812 100644
--- a/cmake/modules/AddLLVM.cmake
+++ b/cmake/modules/AddLLVM.cmake
@@ -565,6 +565,19 @@ macro(add_llvm_executable name)
   llvm_process_sources( ALL_FILES ${ARGN} )
   add_windows_version_resource_file(ALL_FILES ${ALL_FILES})
 
+  # Generate objlib
+  if(LLVM_ENABLE_OBJLIB)
+    # Generate an obj library for both targets.
+    set(obj_name "obj.${name}")
+    add_library(${obj_name} OBJECT EXCLUDE_FROM_ALL
+      ${ALL_FILES}
+      )
+    llvm_update_compile_flags(${obj_name})
+    set(ALL_FILES "$<TARGET_OBJECTS:${obj_name}>")
+
+    set_target_properties(${obj_name} PROPERTIES FOLDER "Object Libraries")
+  endif()
+
   if( EXCLUDE_FROM_ALL )
     add_executable(${name} EXCLUDE_FROM_ALL ${ALL_FILES})
   else()
diff --git a/cmake/modules/TableGen.cmake b/cmake/modules/TableGen.cmake
index 85d720e91fd..fcb445afc58 100644
--- a/cmake/modules/TableGen.cmake
+++ b/cmake/modules/TableGen.cmake
@@ -73,6 +73,10 @@ endfunction()
 macro(add_tablegen target project)
   set(${target}_OLD_LLVM_LINK_COMPONENTS ${LLVM_LINK_COMPONENTS})
   set(LLVM_LINK_COMPONENTS ${LLVM_LINK_COMPONENTS} TableGen)
+
+  # FIXME: It leaks to user, callee of add_tablegen.
+  set(LLVM_ENABLE_OBJLIB ON)
+
   add_llvm_utility(${target} ${ARGN})
   set(LLVM_LINK_COMPONENTS ${${target}_OLD_LLVM_LINK_COMPONENTS})
 
-- 
2.34.1