This changeset is incorrect. http://hg.mozilla.org/integration/mozilla-inbound/rev/92d510a09a8c changeset: 162889:92d510a09a8c user: Mike Shal <mshal@mozilla.com> date: Thu Jan 09 14:43:29 2014 -0500 summary: Bug 875013 - Remove VPATH in media/libvpx; r=joey This fix has the following. SOURCES += [ '%s/sources/android/cpufeatures/cpu-features.c' % CONFIG['ANDROID_NDK'], ] But this means, CSRCS += $TOPSRCDIR/$ANDROID_NDK/sources/... So this path is invalid.

Actually, that changeset was probably correct when it landed. But in the meantime, SOURCES semantics changed.

Specifically, adding '%%' at the beginning of that path should fix it (double % because of the formatting, so that the end result starts with a literal %, which now means absolute path).

(In reply to Mike Hommey [:glandium] from comment #2) > Specifically, adding '%%' at the beginning of that path should fix it > (double % because of the formatting, so that the end result starts with a > literal %, which now means absolute path). The path of cpu-features.c isn't into source directory and objdir directory, so it hits an assertion by "assert isinstance(f, ObjDirPath)" into emit.py.

Change it to be isinstance(f, Path)