[cfe-dev] Out-of-tree CMake dependencies

[Don Hinton via cfe-dev]

This might help you get started (this is for out of tree pointing to my
development build, but you could also point to the installed version if you
have one).

# if you only have/need LLVM:
#  export
LLVM_DIR=/Users/dhinton/projects/llvm_project/build/Debug/lib/cmake/llvm
# if you also have/need clang:
#  export
CLANG_DIR=/Users/dhinton/projects/llvm_project/build/Debug/lib/cmake/clang

# While just setting LLVM_DIR will make find_package work, you need to
# add it to CMAKE_MODULE_PATH if you want to include AddLLVM, e.g., if
# you want to use add_llvm_loadable_module.
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "$ENV{LLVM_DIR};$ENV{Clang_DIR}")
#find_package(LLVM REQUIRED CONFIG)
find_package(Clang REQUIRED CONFIG)
include(AddLLVM)
add_definitions(${LLVM_DEFINITIONS})
include_directories(${LLVM_INCLUDE_DIRS})
include_directories(${CLANG_INCLUDE_DIRS})
link_directories(${LLVM_LIBRARY_DIRS})

message("LLVM_DEFINITIONS = ${LLVM_DEFINITIONS}")
message("LLVM_INCLUDE_DIRS = ${LLVM_INCLUDE_DIRS}")
message("LLVM_LIBRARY_DIRS = ${LLVM_LIBRARY_DIRS}")
message("CLANG_INCLUDE_DIRS = ${CLANG_INCLUDE_DIRS}")

On Wed, Oct 4, 2017 at 11:39 AM, Kim Gräsman via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Hi all,
>
> In include-what-you-use, we recently had this bug report:
> https://github.com/include-what-you-use/include-what-you-use/pull/465
>
> And it's symptomatic for a whole class of problems where we're
> duplicating knowledge from the LLVM/Clang CMake systems to allow both
> in-tree and out-of-tree IWYU development.
>
> (in our terminology, in-tree == cloning the include-what-you-use repo
> into a full LLVM and Clang checkout/clone under
> llvm/tools/clang/tools/include-what-you-use and out-of-tree == cloning
> include-what-you-use anywhere, and giving CMake information about
> where to find LLVM/Clang headers and libraries)
>
> Looking around my system, I see a lot of CMake modules in
> /usr/lib/llvm-4.0 and /usr/share/llvm-4.0, but it's not clear to me
> how to use them. Also, it would be nice to allow a "next-to-tree"
> configuration instead of in-tree, where I can point IWYU at a trunk
> checkout of LLVM and Clang and use its CMake modules.
>
> Is there a correct way to accomplish this?
>
> Thanks,
> - Kim
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