[CMake] Restructure how Clang, Polly and other external projects get included.
While making lld build under the tools directory I decided to refactor how this
works.
There is now a macro, add_llvm_external_project, which takes the name of the
expected subdirectory. This sets up two CMake options.
* LLVM_EXTERNAL_${NAME}_SOURCE_DIR
This is the path to the source. It defaults to
${CMAKE_CURRENT_SOURCE_DIR}/${name}.
* LLVM_EXTERNAL_${NAME}_BUILD
Enable and disable building the tool as part of LLVM.
I chose LLVM_EXTERNAL_${NAME} as a prefix so they all show up together in the
GUI.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155654 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
index 388208b..bfe5127 100755
--- a/cmake/modules/AddLLVM.cmake
+++ b/cmake/modules/AddLLVM.cmake
@@ -130,3 +130,21 @@
add_llvm_library(LLVM${target_name} ${ARGN} ${TABLEGEN_OUTPUT})
set( CURRENT_LLVM_TARGET LLVM${target_name} )
endmacro(add_llvm_target)
+
+# Add external project that may want to be built as part of llvm such as Clang,
+# lld, and Polly. This adds two options. One for the source directory of the
+# project, which defaults to ${CMAKE_CURRENT_SOURCE_DIR}/${name}. Another to
+# enable or disable building it with everthing else.
+macro(add_llvm_external_project name)
+ string(TOUPPER ${name} nameUPPER)
+ set(LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/${name}"
+ CACHE PATH "Path to ${name} source directory")
+ if (NOT ${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR} STREQUAL ""
+ AND EXISTS ${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR}/CMakeLists.txt)
+ option(LLVM_EXTERNAL_${nameUPPER}_BUILD
+ "Whether to build ${name} as part of LLVM" ON)
+ if (LLVM_EXTERNAL_${nameUPPER}_BUILD)
+ add_subdirectory(${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR} ${name})
+ endif()
+ endif()
+endmacro(add_llvm_external_project)