When a user has CFLAGS optimizations for a specific architecture (e.g. -fprefetch-loop-arrays) the mjpegtools ebuild still uses them in spite of the fact that the build itself forces -march=i686. As a result, cc1 dies with error: "-fprefetch-loop-arrays is invalid for specified architecture". The ebuild needs to filter these out or something.
mjpegtools 1.6.0-r7
can you paste/attach the entire log and also emerge info?
it's very easy to recreate: if you have a p4 box handy, add -march=pentium4 -fpretech-loop-arrays to your CFLAGS (or any other p4 specific optimization flag) and try emerging mjpegtools; Since mjpegtools replaces -march=pentium4 with -march=i686 the compiler dies coz -fprefetch-loop-arrays is invalid with -march=i686; my workaround was to temporarily remove flags that cause trouble from CFLAGs just to emerge mjpegtools successfuly, then revert back to normal; I'll try to recreate this for you and paste some additional info.
That would come in handy - i dont have a p4 box lying around. Sounds 'filter-flags -fprefetch-loop-arrays' reasonable to you? -phoen][x-
but i have let's see if it fails for me too
just recently I did emerge gnome and mjpegtools failed as well, with -fprefetch-loop-arrays included in my CFLAGS; filtering these out will do the trick (or not forcing i686) ...
prints out a lot of warning messages cc1: warning: -fprefetch-loop-arrays not supported for this target (try -march switches) fails here too Portage 2.0.47-r10 (default-x86-1.4, gcc-3.2.2, glibc-2.3.1-r4) ================================================================= System uname: 2.4.20-gentoo-r2 i686 GENTOO_MIRRORS="http://localhost/gentoo" CONFIG_PROTECT="/etc /var/qmail/control /usr/kde/2/share/config /usr/kde/3/share/config /usr/X11R6/lib/X11/xkb /usr/kde/3.1/share/config /usr/share/config" CONFIG_PROTECT_MASK="/etc/gconf /etc/env.d" PORTDIR="/usr/portage" DISTDIR="/usr/portage/distfiles" PKGDIR="/usr/portage/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR_OVERLAY="" USE="x86 oss 3dnow apm arts avi crypt cups encode gif java jpeg kde gnome libg++ libwww mikmod mmx motif mpeg ncurses nls pdflib png quicktime spell truetype xml2 xmms xv zlib gdbm berkdb slang readline svga X sdl gpm tcpd pam ssl perl python esd imlib oggvorbis gtk qt opengl" COMPILER="gcc3" CHOST="i686-pc-linux-gnu" CFLAGS="-march=pentium4 -O3 -pipe -ffast-math -fomit-frame-pointer -fprefetch-loop-arrays -fforce-addr" CXXFLAGS="-march=pentium4 -O3 -pipe -ffast-math -fomit-frame-pointer -fprefetch-loop-arrays -fforce-addr" ACCEPT_KEYWORDS="x86" MAKEOPTS="-j2" AUTOCLEAN="yes" SYNC="rsync://localhost/gentoo-portage" FEATURES="sandbox buildpkg ccache"
-fPIC in CFLAGS also borks the compile
comment #8 is invalid this could only be a USE flag, not a CFLAGS
I can confirm that -fPIC breaks the compile for mjpegtools-1.6.0-r7 With the following settings it errors out: CFLAGS="-mcpu=athlon-xp -O3 -pipe -fomit-frame-pointer -fPIC" gcc -DHAVE_CONFIG_H -I. -I. -I.. -I.. -mcpu=i686 -march=i686 -mcpu=athlon-xp -O3 -pipe -fomit-frame-pointer -fPIC -Wall -Wunused -c `test -f cpu_accel.c || echo './'`cpu_accel.c cpu_accel.c: In function `x86_accel': cpu_accel.c:83: can't find a register in class `BREG' while reloading `asm' cpu_accel.c:100: can't find a register in class `BREG' while reloading `asm' cpu_accel.c:106: can't find a register in class `BREG' while reloading `asm' cpu_accel.c:128: can't find a register in class `BREG' while reloading `asm' cpu_accel.c:132: can't find a register in class `BREG' while reloading `asm' make[2]: *** [cpu_accel.o] Error 1 make[2]: *** Waiting for unfinished jobs.... make[2]: Leaving directory `/var/tmp/portage/mjpegtools-1.6.0-r7/work/mjpegtools-1.6.0/utils' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/var/tmp/portage/mjpegtools-1.6.0-r7/work/mjpegtools-1.6.0' make: *** [all] Error 2 !!! ERROR: media-video/mjpegtools-1.6.0-r7 failed. !!! Function src_compile, Line 105, Exitcode 2 When I change it to: CFLAGS="-march=athlon-xp -O3 -pipe -fomit-frame-pointer" this ebuild builds successfully
added filter-flags "-fprefetch-loop-arrays"
