From 07f95b3218e6590ac3476200147f8ce3ffafed93 Mon Sep 17 00:00:00 2001
From: NAKAMURA Takumi <geek4civic@gmail.com>
Date: Wed, 26 Feb 2014 06:53:16 +0000
Subject: [CMake] Use target_link_libraries(INTERFACE|PRIVATE) on CMake-2.8.12
 to increase opportunity for parallel build.

target_link_libraries(INTERFACE) doesn't bring inter-target dependencies in add_library,
although final targets have dependencies to whole dependent libraries.
It makes most libraries can be built in parallel.

target_link_libraries(PRIVATE) is used to shaared library.
Each dependent library is linked to the target.so, and its user will not see its grandchildren.
For example,

  - libclang.so has sufficient libclang*.a(s).
  - c-index-test requires just only libclang.so.

FIXME: lld is tweaked minimally. Adding INTERFACE in each library would be better thing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202241 91177308-0d34-0410-b5e6-96231b3b80d8
---
 cmake/modules/AddLLVM.cmake     |  9 +++++++--
 cmake/modules/LLVM-Config.cmake | 10 +++++++++-
 2 files changed, 16 insertions(+), 3 deletions(-)

(limited to 'cmake/modules')

diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
index bce3b2dd76..543ba93e55 100644
--- a/cmake/modules/AddLLVM.cmake
+++ b/cmake/modules/AddLLVM.cmake
@@ -289,7 +289,12 @@ function(llvm_add_library name)
     endif()
   endif()
 
-  target_link_libraries(${name} ${ARG_LINK_LIBS})
+  if(ARG_STATIC)
+    target_link_libraries(${name} ${cmake_2_8_12_INTERFACE} ${ARG_LINK_LIBS})
+  else()
+    # MODULE|SHARED
+    target_link_libraries(${name} ${cmake_2_8_12_PRIVATE} ${ARG_LINK_LIBS})
+  endif()
 
   llvm_config(${name} ${ARG_LINK_COMPONENTS} ${LLVM_LINK_COMPONENTS})
 
@@ -330,7 +335,7 @@ macro(add_llvm_library name)
   # name, but using get_property(... SET) doesn't suffice to determine if a
   # property has been set to an empty value.
   get_property(lib_deps GLOBAL PROPERTY LLVMBUILD_LIB_DEPS_${name})
-  target_link_libraries(${name} ${lib_deps})
+  target_link_libraries(${name} ${cmake_2_8_12_INTERFACE} ${lib_deps})
 endmacro(add_llvm_library name)
 
 macro(add_llvm_loadable_module name)
diff --git a/cmake/modules/LLVM-Config.cmake b/cmake/modules/LLVM-Config.cmake
index 451fc56c6b..2783af807a 100644
--- a/cmake/modules/LLVM-Config.cmake
+++ b/cmake/modules/LLVM-Config.cmake
@@ -39,7 +39,15 @@ function(explicit_llvm_config executable)
   set( link_components ${ARGN} )
 
   llvm_map_components_to_libnames(LIBRARIES ${link_components})
-  target_link_libraries(${executable} ${LIBRARIES})
+  get_target_property(t ${executable} TYPE)
+  if("${t}" STREQUAL "STATIC_LIBRARY")
+    target_link_libraries(${executable} ${cmake_2_8_12_INTERFACE} ${LIBRARIES})
+  elseif("${t}" STREQUAL "SHARED_LIBRARY" OR "${t}" STREQUAL "MODULE_LIBRARY")
+    target_link_libraries(${executable} ${cmake_2_8_12_PRIVATE} ${LIBRARIES})
+  else()
+    # Use plain form for legacy user.
+    target_link_libraries(${executable} ${LIBRARIES})
+  endif()
 endfunction(explicit_llvm_config)
 
 
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