SCons to make a shared library (.so) with a static library (.a)

Question

I'm trying to get SCons to make a shared library. One of the items going into the .so is a .a static lib.

I have a line like:

env_2.SharedLibrary('libstuff.so', \
  Split("""stuff.cxx mylib/libMine.a""")

And upon running it, I get this error:

scons: *** Source file: mylib/libMine.a \
is static and is not compatible with shared target: libstuff.so

However, I know that a shared library can be made from the .a via a command like:

g++ -m32 -shared -o libstuff.so stuff.o mylib/libMine.a

Any ideas on getting this to work or any workarounds would be greatly appreciated.

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Related question: How do I get scons to put an additional string -shared on the LINK command line for the Program() call? If I could do this, I think it would meet my needs.

Answer 1

Try to set env['STATIC_AND_SHARED_OBJECTS_ARE_THE_SAME']=1 in your SConstruct.

Answer 2

This problem is not specific to scons. To build a shared library, you'll need objects that are compiled with position independent code (-fPIC). Your best bet is to make the shared library out of the source files compiled with the right options.

In SCons, you can define a list of targets that's used to build both libMine.a and libShared.so.

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Update: for your second question, the SharedLibrary builder might do what you need:

SharedLibrary('foo', ['f1.c', 'f2.c', 'f3.c'])

If not, LINKFLAGS sets the flags passed to a link command.