From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnout Vandecappelle Date: Wed, 12 Feb 2014 08:10:23 +0100 Subject: [Buildroot] Build error from time to time In-Reply-To: References: Message-ID: <52FB1E5F.1000305@mind.be> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net On 11/02/14 16:23, Sagaert Johan wrote: > > Hi > > Sometimes I get this error, if I then run make again after removing the nettle-2.7.1 build directory > It rebuilds nettle and the build ends without errors. > Could this be caused by the ccache ? > > (I had run make clean before I started the new build.) > > > ic -MT ecc-modq.o -MD -MP -MF ecc-modq.o.d -fpic -c ecc-modq.c \ > && true > /home/buildroot12git/output/host/usr/bin/ccache /home/buildroot12git/output/host/usr/bin/arm-buildroot-linux-uclibcgnueabi-gcc -I. > -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -DHAVE_CONFIG_H -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE > -D_FILE_OFFSET_BITS=64 -pipe -Os -Wno-pointer-sign -Wall -W -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes > -Wpointer-arith -Wbad-function-cast -Wnested-externs -fpic -MT ecc-generic-redc.o -MD -MP -MF ecc-generic-redc.o.d -fpic -c > ecc-generic-redc.c \ > && true > /usr/bin/make eccdata > make[3]: Entering directory `/home/buildroot12git/output/build/nettle-2.7.1' > Makefile:595: ecc-generic-modq.o.d: No such file or directory Took me a while to find it, but it looks like a parallel build issue in nettle combined with ccache. In the configure step, all the *.d files are created as empty files. These files are included unconditionally in the Makefile, so you get an error if they don't exist. Unfortunately, ccache does an unlink() just before creating the new file, so there is a tiny window of time where the file doesn't exist. It looks like you have a filesystem where this window is relatively large (NFS?), which is why you see the problem and others don't. This is a tough nut to crack fundamentally. * You could say that nettle's behaviour of including empty dependency files is bad. To overcome that, a - can be added in front of the include. * You can say the behaviour of ccache is bad. The unlink could be removed there, except in the case of CCACHE_HARDLINK because it is not possible to create a hardlink to an existing file. Any suggestions on how to proceed? Regards, Arnout > /home/buildroot12git/output/host/usr/bin/ccache /home/buildroot12git/output/host/usr/bin/arm-buildroot-linux-uclibcgnueabi-gcc -I. > -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -DHAVE_CONFIG_H -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE > -D_FILE_OFFSET_BITS=64 -pipe -Os -Wno-pointer-sign -Wall -W -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes > -Wpointer-arith -Wbad-function-cast -Wnested-externs -fpic -MT ecc-size.o -MD -MP -MF ecc-size.o.d -fpic -c ecc-size.c \ > && true > make[3]: *** No rule to make target `ecc-generic-modq.o.d'. Stop. > make[3]: Leaving directory `/home/buildroot12git/output/build/nettle-2.7.1' > make[2]: *** [eccdata.stamp] Error 2 > make[2]: *** Waiting for unfinished jobs.... > make[2]: Leaving directory `/home/buildroot12git/output/build/nettle-2.7.1' > make[1]: *** [all] Error 2 > make[1]: Leaving directory `/home/buildroot12git/output/build/nettle-2.7.1' > make: *** [/home/buildroot12git/output/build/nettle-2.7.1/.stamp_built] Error 2 > > Regards > Sagaert Johan > > > > _______________________________________________ > buildroot mailing list > buildroot at busybox.net > http://lists.busybox.net/mailman/listinfo/buildroot > -- Arnout Vandecappelle arnout at mind be Senior Embedded Software Architect +32-16-286500 Essensium/Mind http://www.mind.be G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR Leuven LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle GPG fingerprint: 7CB5 E4CC 6C2E EFD4 6E3D A754 F963 ECAB 2450 2F1F