[CMake] Again multiple subdirs

[justin]

Hi,

and just in the beginning, I am sorry if this was asked thousands of
times before, but I wasn't able to find it.

The situation is following

src -- common -- common.c
 |
  ---- a -- a.c
 |
  ---- b -- b.c


add_library (a
     ${project_SOURCE_DIR}/common/common
     ${project_SOURCE_DIR}/a/a}

add_library (b
     ${project_SOURCE_DIR}/common/common
     ${project_SOURCE_DIR}/b/b}


This results in a double compilation of common.c. One time for liba and
the other one for libb.

What is the best way to force common.c to be compiled just ones?


Thanks justin

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