[proaudio] ebuild media-sound/jack-audio-connection-kit-9999

[rob <rob@xxxxxxxxxxxxxxx>]

Hi

I just built jack-9999, and saw this message;

* Messages for package media-sound/jack-audio-connection-kit-9999:

* Can't build cpudetection (dynsimd) without cpu 3dnow support. see bug 
#136565.


Looking through the build-log, I saw;

* Can't build cpudetection (dynsimd) without cpu 3dnow support. see bug 
#136565.
* econf: updating jack-audio-connection-kit-9999/config/config.guess 
with /usr/share/gnuconfig/config.guess
* econf: updating jack-audio-connection-kit-9999/config/config.sub with 
/usr/share/gnuconfig/config.sub
../configure --prefix=/usr --host=i686-pc-linux-gnu 
--mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share 
--sysconfdir=/etc --localstatedir=/var/lib --disable-firewire 
--disable-freebob --disable-altivec --enable-alsa --enable-capabilities 
--enable-stripped-jackd --disable-coreaudio --disable-debug 
--enable-html-docs --enable-mmx --disable-oss --disable-portaudio 
--enable-sse --enable-dynsimd --disable-dependency-tracking 
--with-html-dir=/usr/share/doc/jack-audio-connection-kit-9999 
--with-default-tmpdir=/dev/shm --build=i686-pc-linux-gnu

....followed by....

/bin/sh ../libtool --mode=compile i686-pc-linux-gnu-gcc -I.. -I../config 
-I.. -I.. -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS -Wall  -O -msse -msse2 
-m3dnow -c -o simd.lo ./simd.c
i686-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I.. -I../config -I.. -I.. 
-D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS -Wall -g 
-DJACK_LOCATION=\"/usr/bin\" -O2 -march=prescott -pipe 
-I/usr/include/nptl -I../config -I.. -I.. -D_REENTRANT 
-D_POSIX_PTHREAD_SEMANTICS -Wall -g -c transclient.c  -fPIC -DPIC -o 
..libs/libjack_la-transclient.o
i686-pc-linux-gnu-gcc -I.. -I../config -I.. -I.. -D_REENTRANT 
-D_POSIX_PTHREAD_SEMANTICS -Wall -O -msse -msse2 -m3dnow -c ./simd.c  
-fPIC -DPIC -o .libs/simd.o


The ebuild logic;

       # CPU Detection (dynsimd) uses asm routines which requires 
3dnow, mmx and sse.
       # Also, without -O2 it will not compile as well.
       # we test if it is present before enabling the configure flag.
       if use cpudetection ; then
               if (! grep 3dnow /proc/cpuinfo >/dev/null) ; then
                       ewarn "Can't build cpudetection (dynsimd) 
without cpu 3dnow support. see bug #136565."
               elif (! grep sse /proc/cpuinfo >/dev/null) ; then
                       ewarn "Can't build cpudetection (dynsimd) 
without cpu sse support. see bug #136565."
               elif (! grep mmx /proc/cpuinfo >/dev/null) ; then
                       ewarn "Can't build cpudetection (dynsimd) 
without cpu mmx support. see bug #136565."
               else
                       einfo "Enabling cpudetection (dynsimd). Adding 
-mmmx, -msse, -m3dnow and -O2 to CFLAGS."
                       myconf="${myconf} --enable-dynsimd"

                       filter-flags -O*
                       append-flags -mmmx -msse -m3dnow -O2
               fi
       fi

(if I understand it) says 'only add the --enable-dynsimd flag if 3dnow, 
sse, and mmx are all present', but configure is getting the 
--enable-dynsimd flag from somewhere...

After a little more 'digging' I discovered 
http://bugs.gentoo.org/136565, which seems to indicate that the bug was 
closed a few years ago...

I'm puzzled.

Cheers
R