[CMake] List of components being build.

[Schwartz, Philip]

My current project has many components that need to be built. Some portions of our code depend on others and using add_subdirectory, I am having an issue where I get multiple of my targets loaded causing a faliure.

I placed the add_subdirectory in a macro that uses a simple hash style of access

set ( BUILD_MAP_${_name} 1 ) where ${_name} is the target name.

I have an if statement in the macro that tests if BUILD_MAP_${_name} is defined. The issue is say I have a custom mysqlclient that is used by 3 of my projects that are all built as part of "all".

Project A: Depends on Mysqlclient
Project B: Depends on Mysqlclient
Project C: Depends on Mysqlclient

Dir structure
all/
   /lib/Mysqlclient
   /bin/Project A
   /bin/Project B
   /bin/Project C

each of these folders have a CMakeLists.txt. The all/CMakeLists.txt has the following

project(all)
add_subdirectory(lib/Mysqlclient)
add_subdirectory(bin/Project A)
add_subdirectory(bin/Project B)
add_subdirectory(bin/Project C)

When building from the top level and having a definition of "-lmysqlclient" everything works as expected. The issue comes up when I do not want to build all of the source.

Say I would like to build only Project B.

from my build directory, I would run cmake ~/all/Project B.

The cmake process ends without issue, but the make fails on link due to the missing Mysqlclient library not being built. I want to be able to declare dependencies for each project that way I can build each seperately from the top level. So far using a macro to do the add_subdirectory fails because even though I check to see if BUILD_MAP_${_name} is defined, the add_subdirectory command is still run as if the BUILD_MAP_${_name} is not defined (if defined, only an add_dependencies should be run)

Any help would be greatly appreciated.

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