Here is one example: https://hg.mozilla.org/integration/mozilla-inbound/rev/c9b0e6294a7c with log: https://tbpl.mozilla.org/php/getParsedLog.php?id=13324602&tree=Mozilla-Inbound&full=1 Here is another: https://hg.mozilla.org/integration/mozilla-inbound/rev/8417741974ba Both involve adding files to js/src/Makefile.in that are not INSTALLED_HEADERS. Another clue is that philor pointed out that these are the only csets to add files after bug 748001.

Comparing a good log to a failed log, one thing that seems to have gone wrong is that a good log: https://tbpl.mozilla.org/php/getParsedLog.php?id=13317288&tree=Mozilla-Inbound contains the export line: /builds/slave/m-in-lnx/build/obj-firefox/js/src/config/nsinstall -R -m 644 /builds/slave/m-in-lnx/build/js/src/../public/HashTable.h /builds/slave/m-in-lnx/build/js/src/../public/LegacyIntTypes.h /builds/slave/m-in-lnx/build/js/src/../public/MemoryMetrics.h /builds/slave/m-in-lnx/build/js/src/../public/TemplateLib.h /builds/slave/m-in-lnx/build/js/src/../public/Utility.h /builds/slave/m-in-lnx/build/js/src/../public/Vector.h ./../../dist/include/js while a bad log: https://tbpl.mozilla.org/php/getParsedLog.php?id=13324597&tree=Mozilla-Inbound contains the export line: /builds/slave/m-in-lnx/build/obj-firefox/js/src/config/nsinstall -R -m 644 /builds/slave/m-in-lnx/build/js/src/../public/HashTable.h /builds/slave/m-in-lnx/build/js/src/../public/LegacyIntTypes.h /builds/slave/m-in-lnx/build/js/src/../public/MemoryMetrics.h /builds/slave/m-in-lnx/build/js/src/../public/TemplateLib.h /builds/slave/m-in-lnx/build/js/src/../public/Utility.h /builds/slave/m-in-lnx/build/js/src/../public/Vector.h ./dist/include/js Notice that the later export line is installing to "./dist/include/js" instead of "./../../dist/include/js". That seems broken.

Likely related to bug 763987

So, the problem is actually very old, but before bug 763987 it wasn't really important: objdir/js/src/Makefile is created from the top directory with: /usr/bin/perl $srcdir/build/autoconf/make-makefile -t $topsrcdir -d . js/src/Makefile topsrcdir is thus wrong in js/src/Makefile.

(In reply to Mike Hommey [:glandium] from comment #3) > topsrcdir is thus wrong in js/src/Makefile. and DEPTH, too.

(In reply to Mike Hommey [:glandium] from comment #4) > (In reply to Mike Hommey [:glandium] from comment #3) > > topsrcdir is thus wrong in js/src/Makefile. > > and DEPTH, too. huh, no, DEPTH is hardcoded.