Bug#861734: gcc-7 fails to build gnattools on armel

[Matthias Klose <doko@debian.org>]

Package: src:gcc-7
Severity: important

gcc-7 fails to build gnattools on armel ... Not yet checked why. Current trunk
appears to build ok.  Needs investigation if this is caused by a local patch.
Linking libgnat with -latomic might help.

   -nostdinc -I- -I. -I../arm-linux-gnueabi/libgnatvsn -I../gcc/ada/rts
-static-libstdc++ -static-libgcc -Wl,-z,relro -L../arm-linux-gnueabi/libgnatvsn
-lgnatvsn -L../gcc/ada/rts -lgnat-7 ../gcc/libcommon-target.a ../gcc/libcommon.a
../libcpp/libcpp.a ../libbacktrace/.libs/libbacktrace.a ../libiberty/libiberty.a
-B../arm-linux-gnueabi/libstdc++-v3/src/.libs
-B../arm-linux-gnueabi/libstdc++-v3/libsupc++/.libs
-L../arm-linux-gnueabi/libstdc++-v3/src/.libs
-L../arm-linux-gnueabi/libstdc++-v3/libsupc++/.libs
-L../arm-linux-gnueabi/libatomic/.libs \
   --GCC="../gcc/xg++ -B../gcc/ -no-pie -nostdinc -I- -I.
-I../arm-linux-gnueabi/libgnatvsn -I../gcc/ada/rts"
../gcc/ada/rts/libgnat-7.so: undefined reference to `__atomic_load_8'
collect2: error: ld returned 1 exit status
gnatlink-static: error when calling /«PKGBUILDDIR»/build/gcc/xg++
Makefile:230: recipe for target 'gnatcmd' failed
make[4]: *** [gnatcmd] Error 4
make[4]: Leaving directory '/«PKGBUILDDIR»/build/gnattools'
Makefile:12532: recipe for target 'all-gnattools' failed
make[3]: *** [all-gnattools] Error 2