2013/5/22 Alexander Neundorf <neund...@kde.org>
> On Monday 20 May 2013, Daniel Pfeifer wrote:
> > 2013/5/20 Brad King <brad.k...@kitware.com>
> >
> > > We had some recent discussion about encouraging the convention of
> > > "namespace::" for imported targets, but perhaps we should reconsider
> > > the value and cost.
> >
> > One of CMake's most powerful features in my opionion is the way it
> handles
> > sub-projects.
> > I can take two CMake-projects, Foo and Bar, put them in my Worspace
> > directory where I have a CMakeLists.txt file with the content:
> >
> > add_subdirectory(Foo)
> > add_subdirectory(Bar)
> >
> > I can now build these two projects with the same tools and flags, which
> is
> > extremely handy for crosscompilation.
> > This works pretty well in many cases, but sometimes it breaks, because
> some
> > projects are not "good neighbors" or they want to be the top level
> project.
>
> For instance target names must (should) be unique, and using CMAKE_(SOURCE|
> BINARY)_DIR is usually a bad idea in this case.
>
> > I would like to see more projects that can be built both on their own and
> > as part of a bigger workspace.
> > In this case, it is important that these projects make no distincion
> > whether their dependencies are part of the same workspace or not.
>
> I think they have to.
> Let's say Bar depends on the library Foo, Bar has to search for it, and
> fail
> if it is not present:
>
> Bar/CMakeLists.txt:
>
>
> if(NOT TARGET Foo)
> find_package(Foo REQUIRED)
> else()
> set(Foo_LIBRARIES Foo)
> set(Foo_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/somewhere )
> endif()
> ...
>
> target_link_libraries(Bar ${Foo_LIBRARIES})
>
>
> How would you handle it otherwise ?
>
Bar/CMakeLists.txt making use of usage requirements:
find_package(Foo REQUIRED)
target_link_libraries(Bar Foo)
The (generated) top-level CMakeLists.txt file looks like:
project(Workspace NONE)
set(PROJECTS_IN_WORKSPACE Foo Bar)
macro(find_package)
list(FIND PROJECTS_IN_WORKSPACE "${ARGV0}" found)
if(NOT found EQUAL -1)
_find_package(${ARGV})
endif()
endmacro()
add_sundirectory(Foo)
add_sundirectory(Bar)
--
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