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

[Don Hinton via cfe-dev]

You might also want to look at clang's CMakeLists.txt file.  I can be build
either in or out of tree (llvm tree), and handles a lot of this via
llvm-config.

hth...
don

On Wed, Oct 4, 2017 at 10:13 PM, Kim Gräsman <kim.grasman at gmail.com> wrote:

> Hi Don,
>
> Thanks, that looks like it might work! I'll post back with results
> when I have them.
>
> - Kim
>
> On Wed, Oct 4, 2017 at 9:31 PM, Don Hinton <hintonda at gmail.com> wrote:
> > 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
> >> _______________________________________________
> >> cfe-dev mailing list
> >> cfe-dev at lists.llvm.org
> >> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev
> >
> >
>
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