15.4 Checking the distribution

Automake also generates a distcheck target which can be of help to ensure that a given distribution will actually work. distcheck makes a distribution, then tries to do a VPATH build, run the testsuite, and finally make another tarfile to ensure the distribution is self-contained.

Building the package involves running ./configure. If you need to supply additional flags to configure, define them in the DISTCHECK_CONFIGURE_FLAGS variable, either in your top-level `Makefile.am', or on the commande line when invoking make.

If the target distcheck-hook is defined in your `Makefile.am', then it will be invoked by distcheck after the new distribution has been unpacked, but before the unpacked copy is configured and built. Your distcheck-hook can do almost anything, though as always caution is advised. Generally this hook is used to check for potential distribution errors not caught by the standard mechanism.

Speaking about potential distribution errors, distcheck will also ensure that the distclean target actually removes all built files. This is done by running make distcleancheck at the end of the VPATH build. By default, distcleancheck will run distclean and then make sure the build tree has been emptied by running $(distcleancheck_listfiles). Usually this check will find generated files that you forgot to add to the DISTCLEANFILES variable (see section 14. What Gets Cleaned).

The distcleancheck behaviour should be ok for most packages, otherwise you have the possibility to override the definitition of either the distcleancheck target, or the $(distcleancheck_listfiles) variable. For instance to disable distcleancheck completely, add the following rule to your top-level `Makefile.am':

distcleancheck: @:

If you want distcleancheck to ignore built files which have not been cleaned because they are also part of the distribution, add the following definition instead:

distcleancheck_listfiles = \ find -type f -exec sh -c 'test -f $(scrdir)/{} || echo {}'

The above definition is not the default because it's usually an error if your Makefiles cause some distributed files to be rebuilt when the user build the package. (Think about the user missing the tool required to build the file; or if the required tool is built by your package, consider the cross-compilation case where it can't be run.)