[CMake] Full paths for transitive dependencies

[Adam]

I happened to stumble acrosss this today.  I fixed it by adding another
find_package to the last project but this seems to defeat the purpose of
transitive dependencies.  What am I doing wrong?

Here's a more detailed example
(https://github.com/toomuchatonce/cmake_transient_issue.git)

-------------------------------
app - CMakeLists.txt
cmake_minimum_required(VERSION 3.0.2)
add_executable(app main.cpp)
# uncomment to fix link error
#find_package( a NO_MODULE REQUIRED )
find_package( b NO_MODULE REQUIRED )
target_link_libraries(app b)
install(TARGETS app RUNTIME DESTINATION bin)
-------------------------------
libb - CMakeLists.txt
cmake_minimum_required (VERSION 3.0.2)
project(b)
find_package(a NO_MODULE REQUIRED )
add_library(b lib.cpp)
target_link_libraries(b a)
target_include_directories(b PUBLIC "$<INSTALL_INTERFACE:include/b>")
install(TARGETS b EXPORT bConfig ARCHIVE DESTINATION lib/b )
install(FILES b.h DESTINATION include/b)
install(EXPORT bConfig DESTINATION lib/cmake/b )
--------------------------------------
liba - CMakeLists.txt
cmake_minimum_required (VERSION 3.0.2)
project(a)
add_library(a lib.cpp)
target_include_directories(a INTERFACE "$<INSTALL_INTERFACE:include/a>")
install(TARGETS a EXPORT aConfig ARCHIVE DESTINATION lib/a )
install(FILES a.h DESTINATION include/a)
install(EXPORT aConfig DESTINATION lib/cmake/a )
--------------------------------------
superbuild - CMakeLists.txt
cmake_minimum_required( VERSION 3.0.2 )
include(ExternalProject)
set(DEVROOT ${CMAKE_BINARY_DIR}/devroot)
set(CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${DEVROOT})
ExternalProject_Add(
   a
   CMAKE_ARGS ${CMAKE_ARGS}
   SOURCE_DIR ${CMAKE_SOURCE_DIR}/../liba
)
ExternalProject_Add(
   b
   DEPENDS a
   CMAKE_ARGS ${CMAKE_ARGS}
   SOURCE_DIR ${CMAKE_SOURCE_DIR}/../libb
)
ExternalProject_Add(
   app
   DEPENDS b
   CMAKE_ARGS ${CMAKE_ARGS}
   SOURCE_DIR ${CMAKE_SOURCE_DIR}/../app
)

Regards,
Adam

On Tue, Mar 17, 2015 at 4:50 AM, Stephen Kelly <steveire at gmail.com> wrote:

> Richard Taylor wrote:
>
> >
>
> http://www.cmake.org/Wiki/CMake/Tutorials/How_to_create_a_ProjectConfig.cmake_file
> >
>
> Prefer the official documentation instead of the wiki wherever official
> documentation exists (especially if it is well-formatted; that means it's
> probably recent and maintained).
>
>  http://www.cmake.org/cmake/help/v3.0/manual/cmake-packages.7.html
>
> > However, only the names of dependent targets are set (via
> > INTERFACE_LINK_LIBRARIES in <targetname>Targets.cmake)
> >
> > I guess that's where the problem lies, I'm just not sure how to fix it..
>
> The above link documents a find_dependency macro, which you might make use
> of.
>
> Thanks,
>
> Steve.
>
>
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