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    <p>Automake cannot build objects without an explicit target (program, library) that will use these objects. One reason is that compilation options are specified per-target. If two targets, e.g. two binaries use the same object but have different compilation option, the same object may have to be compiled twice.</p> <p>You have three ways to do what you want, they all involve tying your source files to some target.</p> <ol> <li><p>Do not use a <code>src/ctrnn/Makefile.am</code>, just make reference to the subdirectory source files from your <code>src/Makefile.am</code>: <pre> bin_PROGRAMS = foo foo_SOURCES = main.c crtnn/network.cpp crtnn/neuron.cpp </pre> Note that this will build <code>network.o</code> and <code>neuron.o</code> in the same directory as <code>main.o</code>. If you want objects in subdirectories, use <code>AUTOMAKE_OPTIONS = subdir-objects</code>.</p></li> <li><p>Use a convenience library. In <code>src/crtnn/Makefile.am</code> make a library of your two objects:<pre> noinst_LIBRARIES = libcrtnn.a libcrtnn_a_SOURCES = network.cpp neuron.cpp </pre> and in <code>src/Makefile.am</code>, link your executable to the library:<pre> bin_PROGRAMS = foo foo_SOURCES = main.c foo_LDADD = crtnn/libcrtnn.a SUBDIRS = crtnn </pre> It's called "convenience" when it is not going to be installed (you can tell because of the <code>noinst_</code> prefix): it is just used during the build. And this is a static library, so the result is the same as if you had replaced <code>crtnn/libcrtnn.a</code> by <code>crtnn/network.o</code> and <code>crtn/neuro.o</code> when linking <code>foo</code>.</p></li> <li><p>Use a Libtool convenience library. This requires more setup if you are not using Libtool already. You should add a call <code>LT_INIT</code> in <code>configure.ac</code> and rerun <code>autoreconf</code> to install the libtool files. Then you can update <code>src/crtnn/Makefile.am</code> to make a library of your two objects as follows:<pre> noinst_LTLIBRARIES = libcrtnn.la libcrtnn_la_SOURCES = network.cpp neuron.cpp </pre> and <code>src/Makefile.am</code> as follows:<pre> bin_PROGRAMS = foo foo_SOURCES = main.c foo_LDADD = crtnn/libcrtnn.la SUBDIRS = crtnn </pre> What is the difference? you may ask, almost none. One advantage of using Libtool convenience libraries is that they can be nested: a Libtool library can include another Libtool library (this is convenient when you have a deep hierarchy of source code and you are building a library at each level). Also Libtool convenience libraries can be used to build a shared library if you want. Automake's static libraries cannot.</p></li> </ol>
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    1. POHow do I specify in a Makefile.am script that I only want to compile object .o files that can be later linked against?
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    1. POHow do I specify in a Makefile.am script that I only want to compile object .o files that can be later linked against?
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    1. COThanks! I ended up using the libtool method, works perfectly :-)
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