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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