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42 satır
1.9 KiB
42 satır
1.9 KiB
# subproject.cmake:
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#
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# Builds another dependant CMake project, unless the project was already built or installed systemwide.
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#
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# It does this by first checking if project exists systemwide and uses that.
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# If not, it checks if the project was already included and if it was, it does nothing.
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# If both of the above are not true, another CMake project is build.
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#
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# Usually the subprojects are git submodules on git repository, so packagers can avoid linking subprojects and
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# instead always use systemwide libraries, by not downloading submodules. This will normally cause build to fail
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# if systemwide package was not found.
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#
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# Developers can control this behaviour with -DSOURCE_<SUBPROJECT>=ON|OFF option. It's usually useful to have
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# local development versions of everything when developing, and this option makes sure nothing is linked against
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# systemwide libraries.
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#
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# If subprojects are being linked locally, and subprojects include subprojects that were already included.
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# They will not include the subproject again. Instead they link against the already compiled subprojects.
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#
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# This is convenient for development, but not so covenient if you need to have different versions of submodules
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# in-tree for some reason. Rather than doing that I just suggest updating the codebase to work with same library versions.
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function(add_subproject name)
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if(ARGC GREATER 1)
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set(package_name ${ARGV1})
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else()
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set(package_name ${name})
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endif()
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if(TARGET ${name})
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message("Subproject ${name} already included, skipping")
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else()
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find_package(${package_name} QUIET)
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string(TOUPPER ${package_name} upper)
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if(NOT SOURCE_${upper} AND ${upper}_FOUND)
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message("Found ${package_name} on system")
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else()
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message("Adding ${name} as subdirectory")
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add_subdirectory(${name} EXCLUDE_FROM_ALL)
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endif()
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endif()
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endfunction()
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