[Scons-users] Replace env['BUILDERS']['Program'] and env.Configure

[Ringo De Smet]

Luc,

On 24 August 2012 10:52, Luc Bourhis <luc_j_bourhis at mac.com> wrote:


> > If you create the shared and static libraries into different

> directories, then it should be fairly easy.

>

> I am afraid I can't imagine how to do that still.

>


My developers asked me how they could indicate that for e.g. a Program and
SharedLibrary builder, some libraries could be linked statically and some
dynamically. gcc/g++ supports this for example:

g++ -Bstatic -lfirst_static_lib -lsecond_static_lib -Bdynamic
-lfirst_shared_lib -l second_shared_lib ...

I came up with the following:

------------------
def split_libs_in_static_and_shared(environment):
    # Remove the Program and SharedLibrary registration
    import LibProg
    del environment['BUILDERS']['Program']
    del environment['BUILDERS']['SharedLibrary']

    # Now re-initialize the builders to make sure these are no longer
shared with other
    # environments. Once we have separate instances, we can further patch
them.
    environment.Tool('link')

    # And now patch the target_scanner to detect static libraries via
env['STATICLIBS'] & env['SHAREDLIBS']
    LibraryProgramScanner = LibProg.LibraryProgramScanner()
    environment['BUILDERS']['Program'].target_scanner =
LibraryProgramScanner
    environment['BUILDERS']['SharedLibrary'].target_scanner =
LibraryProgramScanner

    # Make sure that all the libs expand properly into a static and dynamic
section on the command line
    environment['_STATICLIBFLAGS'] = '${_stripixes(LIBLINKPREFIX,
STATICLIBS, LIBLINKSUFFIX, LIBPREFIXES, LIBSUFFIXES, __env__)}'
    environment['_DYNAMICLIBFLAGS'] = '${_stripixes(LIBLINKPREFIX,
SHAREDLIBS, LIBLINKSUFFIX, LIBPREFIXES, LIBSUFFIXES, __env__)}'
    environment['_LIBFLAGS'] = '-Wl,-Bstatic ${_STATICLIBFLAGS}
-Wl,-Bdynamic ${_DYNAMICLIBFLAGS}'

    # Return the environment so we can chain several configure calls.
    return environment
------------------

In the above snippet you see references to LibProg and functions in it.
LibProg is a patched version of SCons/Scanner/Prog.py where references to
env['LIBS'] are replaced with "env['SHAREDLIBS'] + env['STATICLIBS']". I
have put this patched LibProg.py in my site_scons folder.

Hope the code comments in the snippet are self-explanatory.

Ringo
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