compiling shared modules (was: Compiling and loading gEDA/gschem plugin)

On Thu, Aug 09, 2012 at 12:13:19PM +0530, [email protected] wrote:
> On Thu, Aug 9, 2012 at 11:59 AM, al davis <[email protected]> wrote:
> > Make has a collection of default rules, so even though
> > lang_geda.o is not explicitly listed in the makefile, make finds
> > a rule to make it.  Since .o is normally not "shared", the
> > "-shared" flag is not used.
>
> Okay, but In order for makefile to compile to a shared object file, we
> need to specifiy that, right?

see the "geda_shared_module" branch (on tool). lines like these should
work for any such module:

plugin_LTLIBRARIES += lang_geda.la
lang_geda_la_SOURCES = lang_geda.cc d_net.cc d_place.cc
lang_geda_la_LDFLAGS = -module -shared
lang_geda_la_CPPFLAGS = $(AM_CPPFLAGS) @GEDA_CFLAGS@

after "make install" to $prefix
LD_LIBRARY_PATH=$prefix/share/gnucap $prefix/bin/gnucap
>load lang_geda.so
works. i havent yet patched gnucap to find it automatically.

regards
felix

PS: please test before merge. also -lgeda must be removed from most
gcc invocations...