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src/lib/Makefile.am
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# Library: libtraining
# Generates its own pkg-config definition file
AM_CPPFLAGS = -DLIBRARY_VERSION=\"$(LIBRARY_VERSION)\"
Why not put
AC_DEFINE([LIBRARY_VERSION], ...)
in configure.ac, so you don't need the above? Of course you may want to
use a less generic name, e.g. TRAINING_LIBRARY_VERSION.
Similar applies to -DPROGRAM_VERSION in src/bin/Makefile.am.
OK. That's a lot more concise. But having done this:
# Step 1: extract version number from a source file
TRAINING_PROGRAM_VERSION=`cat PROGRAM_VERSION`
FWIW, you could actually add ../../LIBRARY_VERSION to this variable.
Yes, it works well too. I'll have all my dependencies handled that way.
But working a little with it, I have one remark:
since, with AC_DEFINE, the version is stored in config.h and that all
source files depend on it, all my C files are rebuild (in lib or bin)
if I change the version file. The smart dependency is lost. So I'll
remove library's and program's versions from config.h and rely on the
old define on the command line. That's better for my need. But I wait
for you comments/tips on the AC_DEFINE I showed earlier in this mail.