[CMake] Problem with circular dependencies

[Dmytro Ovdiienko]

Hello All,

Let's suppose following

1. We have two projects A and B.
2. Project A is stored to <root>/A
3. Project B is stored to <root>/B
4. Project A depends on B.
5. Project B depends on A. (please don't ask me why:) )
6. There is CMakeLists.txt in the <root>


Following is a code of this projects (sample is attached).

#####################################
# Project A
#####################################
SET (PROJECT_NAME A )
PROJECT (${PROJECT_NAME})

INCLUDE_DIRECTORIES(
  ${B_SOURCE_DIR}
)

FILE (GLOB ${PROJECT_NAME}_SOURCE_LIST
    *.cpp
)

ADD_LIBRARY (${PROJECT_NAME} ${${PROJECT_NAME}_SOURCE_LIST})

#####################################
# Project B
#####################################
SET (PROJECT_NAME B )
PROJECT (${PROJECT_NAME})

INCLUDE_DIRECTORIES(
  ${A_SOURCE_DIR}
)

FILE (GLOB ${PROJECT_NAME}_SOURCE_LIST
    *.cpp
)

ADD_LIBRARY (${PROJECT_NAME} ${${PROJECT_NAME}_SOURCE_LIST})


And now we generate the project files and check Additional Includes
Directories of the A project.

Expected it is equal to <root>/B.
But in fact it is empty.

Suppose CMake processes INCLUDE_DIRECTORIES before all projects are loaded.

The other side of this problem is you have to write ADD_SUBDIRECTORY
commands in specific order. IMHO it is inconvenient.


What do you think?



Regards,

Dima
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