I am having a problem with make 3.12 (windows) and cmake version 3.13.0-rc2
(linux). I am attempting to link boost headers privately to a static library,
which is then linked by a client executable, that I do not want to depend on
boost.
According to the docs, the find_package(Boost) provides a target for the header
only portion of the boost library, Boost::boost. this is the target I am using,
and I am linking the target privately, ie
target_link_libraries(testlib PRIVATE Boost::boost)
However a the client testexe which uses testlib from the install dir with
find_package(testlib)and links it with target_link_libraries(testexe
testlib::testlib) is causing cmake to search for a Boost dependency for the
testexe. As this is linked privately, it shouldn't as far as I can see.
Interestingly adding an INTERFACE IMPORTED target in testlib and using this to
link, and the client no longer needs boost.
find_package(Boost REQUIRED)
add_library(boost INTERFACE IMPORTED)
set_property(TARGET boost PROPERTY
INTERFACE_INCLUDE_DIRECTORIES ${Boost_INCLUDE_DIR})
target_link_libraries(testlib
PRIVATE
#using the imported target instead
boost
#Boost::boost)
this is almost identical to the lines in the Find boost source
here<https://github.com/Kitware/CMake/blob/master/Modules/FindBoost.cmake#L2026-L2030>.
The only difference being the target the properties are set on.
I have a workaround but I would like to know what is going on.
The complete source for the two test projects are availabe
here<https://github.com/rmawatson/share/tree/master/cmake_boost>.
This is the output from cmake with using the Boost::boost target and the
INTERFACE IMPORTEDtarget, which works
###using to the provided Boost::boost target
C:\Temp\cmake_boost\testlib\build>cmake ../
-DBOOST_ROOT=d:\sdk\boost\boost_1_68_0
-- Boost version: 1.68.0-- Configuring done
-- Generating done
-- Build files have been written to: C:/Temp/cmake_boost/testlib/build
C:\Temp\cmake_boost\testexe\build>cmake ../
-DCMAKE_PREFIX_PATH="C:\Temp\cmake_boost\testlib\build"-- Configuring done
CMake Error at CMakeLists.txt:6 (add_executable):
Target "test" links to target "Boost::boost" but the target was not found.
Perhaps a find_package() call is missing for an IMPORTED target, or an
ALIAS target is missing?............-- Generating done
-- Build files have been written to: C:/Temp/cmake_boost/testexe/build
#When using the imported library target.
C:\Temp\cmake_boost\testlib\build>cmake ../
-DBOOST_ROOT=d:\sdk\boost\boost_1_68_0
-- Boost version: 1.68.0-- Configuring done
-- Generating done
-- Build files have been written to: C:/Temp/cmake_boost/testlib/build
C:\Temp\cmake_boost\testexe\build>cmake ../
-DCMAKE_PREFIX_PATH="C:\Temp\cmake_boost\testlib\build"-- Configuring done
-- Generating done
-- Build files have been written to: C:/Temp/cmake_boost/testexe/build
Thanks!
--
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