[PATCH] [CMake] Introduce LLVM_DEAD_STRIP instead of LLVM_NO_DEAD_STRIP

[NAKAMURA Takumi]

Hi chandlerc,

I think "LLVM_NO_DEAD_STRIP" would confuse like a double negative.
I propose "LLVM_DEAD_STRIP", ON if available. Each executable can turn it OFF.

http://llvm-reviews.chandlerc.com/D2941

Files:
  clang/tools/driver/CMakeLists.txt
  llvm/cmake/modules/AddLLVM.cmake
  llvm/cmake/modules/HandleLLVMOptions.cmake
  llvm/tools/bugpoint/CMakeLists.txt
  llvm/tools/llc/CMakeLists.txt
  llvm/tools/opt/CMakeLists.txt
  llvm/unittests/ExecutionEngine/JIT/CMakeLists.txt

Index: clang/tools/driver/CMakeLists.txt
===================================================================
--- clang/tools/driver/CMakeLists.txt
+++ clang/tools/driver/CMakeLists.txt
@@ -17,7 +17,7 @@
   )
 
 # Support plugins.
-set(LLVM_NO_DEAD_STRIP 1)
+set(LLVM_DEAD_STRIP OFF)
 
 add_clang_executable(clang
   driver.cpp
Index: llvm/cmake/modules/AddLLVM.cmake
===================================================================
--- llvm/cmake/modules/AddLLVM.cmake
+++ llvm/cmake/modules/AddLLVM.cmake
@@ -134,17 +134,19 @@
 endfunction(add_llvm_symbol_exports)
 
 function(add_dead_strip target_name)
-  if(NOT LLVM_NO_DEAD_STRIP)
-    if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
-      set_property(TARGET ${target_name} APPEND_STRING PROPERTY
-                   LINK_FLAGS " -Wl,-dead_strip")
-    elseif(NOT WIN32)
-      # Object files are compiled with -ffunction-data-sections.
-      set_property(TARGET ${target_name} APPEND_STRING PROPERTY
-                   LINK_FLAGS " -Wl,--gc-sections")
-    endif()
+  if(NOT LLVM_DEAD_STRIP)
+    return()
   endif()
-endfunction(add_dead_strip)
+
+  if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
+    set_property(TARGET ${target_name} APPEND_STRING PROPERTY
+      LINK_FLAGS " -Wl,-dead_strip")
+  elseif(NOT WIN32)
+    # Object files are compiled with -ffunction-data-sections.
+    set_property(TARGET ${target_name} APPEND_STRING PROPERTY
+      LINK_FLAGS " -Wl,--gc-sections")
+  endif()
+endfunction()
 
 # Set each output directory according to ${CMAKE_CONFIGURATION_TYPES}.
 # Note: Don't set variables CMAKE_*_OUTPUT_DIRECTORY any more,
Index: llvm/cmake/modules/HandleLLVMOptions.cmake
===================================================================
--- llvm/cmake/modules/HandleLLVMOptions.cmake
+++ llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -353,8 +353,9 @@
 # Add flags for add_dead_strip().
 # FIXME: With MSVS, consider compiling with /Gy and linking with /OPT:REF?
 # But MinSizeRel seems to add that automatically, so maybe disable these
-# flags instead if LLVM_NO_DEAD_STRIP is set.
+# flags instead if LLVM_DEAD_STRIP is not set.
 if(NOT CYGWIN AND NOT WIN32)
+  set(LLVM_DEAD_STRIP ON)
   if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
     check_c_compiler_flag("-Werror -fno-function-sections" C_SUPPORTS_FNO_FUNCTION_SECTIONS)
     if (C_SUPPORTS_FNO_FUNCTION_SECTIONS)
Index: llvm/tools/bugpoint/CMakeLists.txt
===================================================================
--- llvm/tools/bugpoint/CMakeLists.txt
+++ llvm/tools/bugpoint/CMakeLists.txt
@@ -18,7 +18,7 @@
   )
 
 # Support plugins.
-set(LLVM_NO_DEAD_STRIP 1)
+set(LLVM_DEAD_STRIP OFF)
 
 add_llvm_tool(bugpoint
   BugDriver.cpp
Index: llvm/tools/llc/CMakeLists.txt
===================================================================
--- llvm/tools/llc/CMakeLists.txt
+++ llvm/tools/llc/CMakeLists.txt
@@ -12,7 +12,7 @@
   )
 
 # Support plugins.
-set(LLVM_NO_DEAD_STRIP 1)
+set(LLVM_DEAD_STRIP OFF)
 
 add_llvm_tool(llc
   llc.cpp
Index: llvm/tools/opt/CMakeLists.txt
===================================================================
--- llvm/tools/opt/CMakeLists.txt
+++ llvm/tools/opt/CMakeLists.txt
@@ -19,7 +19,7 @@
   )
 
 # Support plugins.
-set(LLVM_NO_DEAD_STRIP 1)
+set(LLVM_DEAD_STRIP OFF)
 
 add_llvm_tool(opt
   AnalysisWrappers.cpp
Index: llvm/unittests/ExecutionEngine/JIT/CMakeLists.txt
===================================================================
--- llvm/unittests/ExecutionEngine/JIT/CMakeLists.txt
+++ llvm/unittests/ExecutionEngine/JIT/CMakeLists.txt
@@ -52,7 +52,7 @@
 endif()
 
 # The JIT tests need to dlopen things.
-set(LLVM_NO_DEAD_STRIP 1)
+set(LLVM_DEAD_STRIP OFF)
 
 add_llvm_unittest(JITTests
   ${JITTestsSources}
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