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bug#12064: distclean failure with Automake 1.12.2

From: Peter Johansson
Subject: bug#12064: distclean failure with Automake 1.12.2
Date: Fri, 27 Jul 2012 12:12:30 +1000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.6esrpre) Gecko/20120714 Thunderbird/10.0.6

Hi automakers,

I was about to make a release when I discovered that distcheck suddenly didn't work anymore. The distclean rule failed with

Making distclean in doc
make[2]: Entering directory 
Makefile:498: ../yat/classifier/doxygen.mk: No such file or directory
Makefile:499: ../yat/normalizer/doxygen.mk: No such file or directory

This was for a stable branch release so there had just been minor changes in two .cc files and no changes at all wrt the build system. After some investigation I found that Automake 1.12.2 has changed the order directories are traversed for clean rules. I must say I find it unexpected that behaviour like this is changed between 1.12.1 and 1.12.2. I thought this kind of changes were only introduced when bumping versions from say 1.11 to 1.12 and not between stable releases.

The reason I got the failure is that files doxygen.mk are included into doc/Makefile. These files are generated in the corresponding Makefile and listed under DISTCLEANFILES so they are deleted during 'make distclean'. As SUBDIRS in top Makefile.am is SUBDIRS = doc yat that was not a problem before since doc was entered first during cleaning and doc/Makefile was already gone when the doxygen.mk files were removed. Perhaps a strange use case, but still I wanted to report it.

I think I've found a workaround so I can get out the release without needing to downgrade Automake.


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