how to create binary and .so using libtool

Question

I have a set of cpp files that I want to compile directly into a binary and also to compile into a shared library.

I have

bin_PROGRAMS=mybin
lib_LTLIBRARIES=libmylib.la

COMMON_SOURCES=f1.cpp f2.cpp f3.cpp

mybin_SOURCES=main.cpp $(COMMON_SOURCES)
libmylib_la_SOURCES=$(COMMON_SOURCES)

When I run this the cpp files are compiled twice, once with libtool and once without and sometimes libtool/automake complains

Makefile.am: object `f1.$(OBJEXT)' created both with libtool and without`

I tried putting COMMON_SOURCES into a .a file but then libtool complains when I link a .a with a .la (saying its not portable).

What I need is something like

bin_LTPROGRAMS=mybin

but that doesnt exist

edit: clarification - I am using automake/autoconf. What I have shown above is the meat of my automake Makefile.am

Answer 1

Link against the library of common sources specifically:

bin_PROGRAMS = mybin
lib_LTLIBRARIES = libmylib.la

mybin_SOURCES = main.cpp
mybin_LDADD = libmylib.la
libmylib_la_SOURCES = f1.cpp f2.cpp f3.cpp

If libmylib.la ends up using files that shouldn't be linked into mybin, create a libtool convenience library, using a Makefile.am something like this:

bin_PROGRAMS = mybin
noinst_LTLIBRARIES = libcommon.la
lib_LTLIBRARIES = libmylib.la

mybin_SOURCES = main.cpp
mybin_LDADD = libcommon.la

libmylib_la_SOURCES = f4.cpp f5.cpp f6.cpp
libmylib_la_LIBADD = libcommon.la

libcommon_la_SOURCES = f1.cpp f2.cpp f3.cpp

This will link f1.cpp, f2.cpp, f3.cpp, f4.cpp, f5.cpp and f6.cpp into libmylib.la and main.cpp, f1.cpp, f2.cpp and f3.cpp into mybin.