[LLVMdev] llvm in a subdirectory with cmake

[Victor Zverovich]

Hi All,

The proposed patch makes possible to use LLVM's CMake build infrastructure
(most importantly add_llvm_library and add_llvm_executable macros) from the
project that has llvm in a subdirectory.

For example:

demo/
    llvm/
    demo.cpp
    CMakeLists.txt

where CMakeLists.txt is as follows:

# ----------------------------- Start
of CMakeLists.txt ----------------------------------------

project(DEMO)
cmake_minimum_required(VERSION 2.6.1)

add_subdirectory("${DEMO_SOURCE_DIR}/llvm")

include_directories(
  "${LLVM_SOURCE_DIR}/include"
  "${LLVM_BINARY_DIR}/include"
)
set(LLVM_LINK_COMPONENTS core jit interpreter native)

add_llvm_executable(DEMO demo.cpp)

# ----------------------------- End
of CMakeLists.txt ----------------------------------------

As you can see with this patch creating a project using CMake outside of the
LLVM directory structure is as simple as inside.

To this end I made the following CMake variables stored in cache:

LLVM_COMMON_DEPENDS
LLVM_NATIVE_ARCH
llvm_libs
MSVC_LIB_DEPS_LLVM*

Best regards,
Victor
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