On 21-Aug-14 00:50, Nico Schl?mer <nico.schloe...@gmail.com> wrote:
Hi all,
a general question:
I have a dependency chain of libraries
A -> B -> C -> ... -> Z
and all of those libraries are built with CMake, using CMake's export
functionality [1] to let the next in the chain know about its the
dependencies.
If all of the libraries are built statically and A needs some symbols
from a third-party library A1, this information needs to travel to Z.
Right now, in the export file I'm writing out the link line as
set(a_EXTRA_LIBS -lhdf5 -lhdf5_hl -ldl -lm -lz -lcurl)
You need to use find_package instead of raw `-l<lib>` option since `-l`
will not work for windows.
In this case it will looks something like this (e.g. curl):
# CMakeLists.txt
find_package(CURL REQUIRED)
target_include_directories(<your_target> PUBLIC ${CURL_INCLUDE_DIRS})
target_link_libraries(<your_target> PUBLIC ${CURL_LIBRARIES})
See that library's paths are hard-coded in <Project>Targets*.cmake after
exporting:
set_target_properties(
<your-target> PROPERTIES
INTERFACE_INCLUDE_DIRECTORIES "/usr/include"
)
set_target_properties(
<your-target> PROPERTIES
IMPORTED_LINK_INTERFACE_LIBRARIES_RELEASE
"/usr/lib/x86_64-linux-gnu/libcurl.so"
)
If it's not appropriate you can "find" it inside
<Project>Config.cmake.in file:
@PACKAGE_INIT@
find_package(CURL REQUIRED)
include(".../<Project>Targets.cmake") # import <your_target_name>
target_include_directories(<your_target> PUBLIC ${CURL_INCLUDE_DIRS})
# New curl location
target_link_libraries(<your_target> PUBLIC ${CURL_LIBRARIES})
but link type need to be PRIVATE:
# CMakeLists.txt
find_package(CURL REQUIRED)
target_include_directories(<your_target> PRIVATE
${CURL_INCLUDE_DIRS}) # Avoid publishing hard-coded location
target_link_libraries(<your_target> PRIVATE ${CURL_LIBRARIES})
It's simplier when third-party package is config mode friendly:
# CMakeLists.txt
find_package(SomePack CONFIG REQUIRED)
target_link_libraries(<your_target> PUBLIC SomePack::some_lib)
# <Project>Config.cmake.in
@PACKAGE_INIT@
find_package(SomePack CONFIG REQUIRED) # import SomePack::some_lib
include(".../<Project>Targets.cmake") # link to SomePack::some_lib
automatically
# `target_link_libraries` not needed, already linked
Hope this helps.
--
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