Re: [Combining libraries in subdirectories into one library]

["Gary V. Vaughan" <gvv at techie dot com>]

On Fri, Aug 18, 2000 at 06:33:08PM +0100, Murray Cumming wrote:
> Tim Heath <th374862@cosd.fedex.com> wrote:
> > I need to understand better the way to combine libraries in
> > subdirectories into one library at the top_srcdir.  Does anyone know of
> > an example that does this with static libraries I could look at?  I
> > created the static libraries myself so I don't beleive there is any m4
> > macros for them to use in configure.in.  
> 
> If the page on my site does not explain this well enough then I would welcome
> a suggestion about something that should be improved. 
> 
> The downloadable example on the 'Building C/C++ libraries...' page combines
> libtool libraries from sub directories. The example on the 'Using autoconf and
> automake...' page combines static libraries from sub directories into an
> executable. It should take much more work to combine static libraries into one
> static library. Although, I believe that there is some way that a libtool
> library can be used to generate a static library.

There is.  The libraries in the subdirectories should be built as
libtool convenience libraries.  Each corresponding Makefile.am should
look a bit like this:

	noinst_LTLIBRARIES = libsubdirectory.la
	libsubdirectory_la_SOURCES = src1.c srcn.c
	
If you only want old style static ar archives, you must add:

	libsubdirectory_la_LDFLAGS = -static
	
To combine a bunch of these in a different directory, the Makefile.am
looks something like this:

	lib_LTLIBRARIES = libcombine.la
	libcombine_la_SOURCES = comb1.c combn.c
	libcombine_la_LIBADD = $(top_builddir)/sub1/libsubdirectory.la \
		$(top_builddir)/subn/libanothersubdir.la
		
Again you can also add:

	libcombin_la_LDFLAGS = -static
	
if you only want ar archives.

Cheers,
	Gary.
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