Erreur de compilation (emerge failed)

bonjour quand je fais emerge j'ai plein d'erreur qui apparaissent et je ne sais pas c'est du a quoi j'ai cherché partout aucune solution quelqu'un peut m'éclaircir ? c'est pour un projet que je dois réaliser sur gentoo

Calculating dependencies... done!
*
>>> Verifying ebuild manifests
>>> Running pre-merge checks for media-sound/pulseaudio-5.0-r1
** Determining the location of the kernel source code
** Found kernel source directory:
****** /usr/src/linux
** Found kernel object directory:
****** /lib/modules/3.12.13-gentoo/build
** Found sources for kernel version:
****** 3.12.13-gentoo
** Checking for suitable kernel configuration options...********************************** [ ok ]
** A preallocated buffer-size of 2048 (kB) or higher is recommended for the HD-audio driver!
** CONFIG_SND_HDA_PREALLOC_SIZE=64
>>> Running pre-merge checks for kde-base/kdelibs-4.11.5
*
>>> Emerging (1 of 123) dev-libs/libatomic_ops-7.2d
** gc-7.2d.tar.gz SHA256 SHA512 WHIRLPOOL size ;-) ...************************************ [ ok ]
>>> Unpacking source...
>>> Unpacking gc-7.2d.tar.gz to /var/tmp/portage/dev-libs/libatomic_ops-7.2d/work
>>> Source unpacked in /var/tmp/portage/dev-libs/libatomic_ops-7.2d/work
>>> Preparing source in /var/tmp/portage/dev-libs/libatomic_ops-7.2d/work/gc-7.2/libatomic_ops ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/dev-libs/libatomic_ops-7.2d/work/gc-7.2/libatomic_ops ...
** econf: updating gc-7.2/libatomic_ops/config.guess with /usr/share/gnuconfig/config.guess
** econf: updating gc-7.2/libatomic_ops/config.sub with /usr/share/gnuconfig/config.sub
** econf: updating gc-7.2/config.guess with /usr/share/gnuconfig/config.guess
** econf: updating gc-7.2/config.sub with /usr/share/gnuconfig/config.sub
./configure --prefix=/usr --build=i686-pc-linux-gnu --host=i686-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --disable-dependency-tracking
checking build system type... i686-pc-linux-gnu
checking host system type... i686-pc-linux-gnu
checking target system type... i686-pc-linux-gnu
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking for i686-pc-linux-gnu-ranlib... i686-pc-linux-gnu-ranlib
checking for style of include used by make... GNU
checking for i686-pc-linux-gnu-gcc... i686-pc-linux-gnu-gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether i686-pc-linux-gnu-gcc accepts -g... yes
checking for i686-pc-linux-gnu-gcc option to accept ISO C89... none needed
checking dependency style of i686-pc-linux-gnu-gcc... none
checking whether i686-pc-linux-gnu-gcc and cc understand -c and -o together... yes
checking dependency style of i686-pc-linux-gnu-gcc... none
checking how to run the C preprocessor... i686-pc-linux-gnu-gcc -E
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking for stdlib.h... (cached) yes
checking for unistd.h... (cached) yes
checking for sys/param.h... yes
checking for getpagesize... yes
checking for working mmap... yes
checking for ANSI C header files... (cached) yes
checking for PIC compiler flag... -fPIC
checking whether gcc -fPIC causes __PIC__ definition... yes
checking for pthread_self in -lpthread... yes
configure: creating ./config.status
config.status: creating Makefile
config.status: creating pkgconfig/atomic_ops.pc
config.status: creating pkgconfig/atomic_ops-uninstalled.pc
config.status: creating doc/Makefile
config.status: creating src/Makefile
config.status: creating src/atomic_ops/Makefile
config.status: creating src/atomic_ops/sysdeps/Makefile
config.status: creating tests/Makefile
config.status: creating src/config.h
config.status: executing depfiles commands
config.status: executing default commands
>>> Source configured.
>>> Compiling source in /var/tmp/portage/dev-libs/libatomic_ops-7.2d/work/gc-7.2/libatomic_ops ...
make -j2 AR=i686-pc-linux-gnu-ar
Making all in src
make[1]: Entering directory `/var/tmp/portage/dev-libs/libatomic_ops-7.2d/work/gc-7.2/libatomic_ops/src'
make* all-recursive
make[2]: Entering directory `/var/tmp/portage/dev-libs/libatomic_ops-7.2d/work/gc-7.2/libatomic_ops/src'
Making all in atomic_ops
make[3]: Entering directory `/var/tmp/portage/dev-libs/libatomic_ops-7.2d/work/gc-7.2/libatomic_ops/src/atomic_ops'
Making all in sysdeps
make[4]: Entering directory `/var/tmp/portage/dev-libs/libatomic_ops-7.2d/work/gc-7.2/libatomic_ops/src/atomic_ops/sysdeps'
make[4]: Nothing to be done for `all'.
make[4]: Leaving directory `/var/tmp/portage/dev-libs/libatomic_ops-7.2d/work/gc-7.2/libatomic_ops/src/atomic_ops/sysdeps'
make[4]: Entering directory `/var/tmp/portage/dev-libs/libatomic_ops-7.2d/work/gc-7.2/libatomic_ops/src/atomic_ops'
make[4]: Nothing to be done for `all-am'.
make[4]: Leaving directory `/var/tmp/portage/dev-libs/libatomic_ops-7.2d/work/gc-7.2/libatomic_ops/src/atomic_ops'
make[3]: Leaving directory `/var/tmp/portage/dev-libs/libatomic_ops-7.2d/work/gc-7.2/libatomic_ops/src/atomic_ops'
make[3]: Entering directory `/var/tmp/portage/dev-libs/libatomic_ops-7.2d/work/gc-7.2/libatomic_ops/src'
i686-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I.* -I../src -I../src* -fPIC -march=i686 -mtune=generic -DNDEBUG -c atomic_ops.c
i686-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I.* -I../src -I../src* -fPIC -march=i686 -mtune=generic -DNDEBUG -c atomic_ops_stack.c
In file included from atomic_ops.h:212:0,
*****************from atomic_ops_stack.h:32,
*****************from atomic_ops_stack.c:23:
atomic_ops/sysdeps/gcc/x86.h: In function ‘AO_compare_double_and_swap_double_full’:
atomic_ops/sysdeps/gcc/x86.h:149:5: error: can’t find a register in class ‘GENERAL_REGS’ while reloading ‘asm’
atomic_ops/sysdeps/gcc/x86.h:149:5: error: ‘asm’ operand has impossible constraints
make[3]: *** [atomic_ops_stack.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[3]: Leaving directory `/var/tmp/portage/dev-libs/libatomic_ops-7.2d/work/gc-7.2/libatomic_ops/src'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/var/tmp/portage/dev-libs/libatomic_ops-7.2d/work/gc-7.2/libatomic_ops/src'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/var/tmp/portage/dev-libs/libatomic_ops-7.2d/work/gc-7.2/libatomic_ops/src'
make: *** [all-recursive] Error 1
** ERROR: dev-libs/libatomic_ops-7.2d::gentoo failed (compile phase):
**** emake failed
**
** If you need support, post the output of `emerge --info '=dev-libs/libatomic_ops-7.2d::gentoo'`,
** the complete build log and the output of `emerge -pqv '=dev-libs/libatomic_ops-7.2d::gentoo'`.
** The complete build log is located at '/var/tmp/portage/dev-libs/libatomic_ops-7.2d/temp/build.log'.
** The ebuild environment file is located at '/var/tmp/portage/dev-libs/libatomic_ops-7.2d/temp/environment'.
** Working directory: '/var/tmp/portage/dev-libs/libatomic_ops-7.2d/work/gc-7.2/libatomic_ops'
** S: '/var/tmp/portage/dev-libs/libatomic_ops-7.2d/work/gc-7.2/libatomic_ops'
*
>>> Failed to emerge dev-libs/libatomic_ops-7.2d, Log file:
*
>>>* '/var/tmp/portage/dev-libs/libatomic_ops-7.2d/temp/build.log'
*
** Messages for package media-sound/pulseaudio-5.0-r1:
*
** A preallocated buffer-size of 2048 (kB) or higher is recommended for the HD-audio driver!
** CONFIG_SND_HDA_PREALLOC_SIZE=64
*
** Messages for package dev-libs/libatomic_ops-7.2d:
*
** ERROR: dev-libs/libatomic_ops-7.2d::gentoo failed (compile phase):
**** emake failed
**
** If you need support, post the output of `emerge --info '=dev-libs/libatomic_ops-7.2d::gentoo'`,
** the complete build log and the output of `emerge -pqv '=dev-libs/libatomic_ops-7.2d::gentoo'`.
** The complete build log is located at '/var/tmp/portage/dev-libs/libatomic_ops-7.2d/temp/build.log'.
** The ebuild environment file is located at '/var/tmp/portage/dev-libs/libatomic_ops-7.2d/temp/environment'.
** Working directory: '/var/tmp/portage/dev-libs/libatomic_ops-7.2d/work/gc-7.2/libatomic_ops'
** S: '/var/tmp/portage/dev-libs/libatomic_ops-7.2d/work/gc-7.2/libatomic_ops'