Dear CMake experts,
I'm facing the following problem. I have a project with many
subdirectories, all at the same hierarchical level:
/my/project/path/CMakeLists.txt
/my/project/path/A - include
|- src
|- CMakeLists.txt
/my/project/path/B - include
|- src
|- CMakeLists.txt
Each subdir corresponds to a package that a user is allowed to modify
and build against a given "general release" already installed centrally
or against other locally built packages.
Some of the executables of package A must be linked against an object
file generated by package B. The user could build package B, so that the
object file needed by executables in package A is the "local" one, but
could also decide to rely on the one that comes from the already
installed release.
To give an example:
- package A has something like:
add_executable(X src/X.cc)
target_link_libraries(X ${RIGHTPATH}/ObjFile.o A B C)
add_dependencies(X obj_file_target)
- package B has something like:
add_custom_command(
OUTPUT ${LIBRARY_OUTPUT_PATH}/ObjFile.o
COMMAND ${CMAKE_CXX_COMPILER} -Wall
-I${PROJECT_SOURCE_DIR}/include -c
${CMAKE_CURRENT_SOURCE_DIR}/src/ObjFile.cc -o
${LIBRARY_OUTPUT_PATH}/ObjFile.o)
add_custom_target(obj_file_target DEPENDS ${LIBRARY_OUTPUT_PATH}/ObjFile.o)
In this way executable X triggers the compilation of ObjFile.o which is
put into ${LIBRARY_OUTPUT_PATH}.
The point is that if the user wants to use the system ObjFile.o located
in, say, /Soft/Releases/V1/lib/ObjFile.o I don't have a way to determine
for package A the value of RIGHTPATH (either ${LIBRARY_OUTPUT_PATH} or
/Soft/Releases/V1/lib/) as the path variable is set when I enter package
A which can happen before I enter package B.
How could I solve this issue? Is there a way to conditionally select
which library my exe will be linked against?
Thanks in advance for your help.
Marco
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