[CMake] libs only target

[Jan Woetzel]

Brad King wrote:

> IF(BUILD_EXAMPLES)

Thanks Brad,
that's almost the approach we currently use except
IF (BUILD_EXAMPLES OR BUILD_TESTING)
for ctest ADD_TEST executable targets.

However,
we are not satisfied with this approach because:
(1) If someone has built only the libs and he decides he wants the 
examples,
he has to run cmake to set BUILD_EXAMPLES (which takes time) which 
creates/configures a new config.h (from config.in).
This config.h is included alomost everywhere and thus everything is 
unneccessarily rebuilt.

So we prefer the approach of target:
- "all" build libs+executables,
- "libs" compiles+links all libraries but skips compiling+linking 
executables.
I tried to create a "libs" target manually that depends on all libs od 
the project.
This failed because the target names for the libraries are so different 
between generators,compilersa and platforms (e.g. make, nmake, Visual 
Studio).

Jan.

-- 

  Dipl.-Ing. Jan Woetzel
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  University of Kiel
  Institute of Computer Science and Applied Mathematics
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