https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104673
--- Comment #2 from Chris Packham <judge.packham at gmail dot com> --- GCC configure line is $ /home/ctng/crosstool-ng/.build/powerpc-unknown-linux-gnu/src/gcc/configure --build=x86_64-build_pc-linux-gnu --host=x86_64-build_pc-linux-gnu --target=powerpc-unknown-linux-gnu --prefix=/home/ctng/x-tools/powerpc-unknown-linux-gnu --exec_prefix=/home/ctng/x-tools/powerpc-unknown-linux-gnu --with-sysroot=/home/ctng/x-tools/powerpc-unknown-linux-gnu/powerpc-unknown-linux-gnu/sysroot --enable-languages=c,c++ --with-cpu=e500mc --with-pkgversion=crosstool-NG 1.24.0.548_0e1989a --enable-__cxa_atexit --disable-libmudflap --disable-libgomp --disable-libssp --disable-libquadmath --disable-libquadmath-support --disable-libsanitizer --disable-libmpx --disable-libstdcxx-verbose --with-gmp=/home/ctng/crosstool-ng/.build/powerpc-unknown-linux-gnu/buildtools --with-mpfr=/home/ctng/crosstool-ng/.build/powerpc-unknown-linux-gnu/buildtools --with-mpc=/home/ctng/crosstool-ng/.build/powerpc-unknown-linux-gnu/buildtools --with-isl=/home/ctng/crosstool-ng/.build/powerpc-unknown-linux-gnu/buildtools --enable-lto --enable-threads=posix --enable-target-optspace --enable-plugin --disable-nls --disable-multilib --with-local-prefix=/home/ctng/x-tools/powerpc-unknown-linux-gnu/powerpc-unknown-linux-gnu/sysroot --enable-long-long Invocation is $ powerpc-unknown-linux-gnu-gcc -mcpu=e500mc -O2 -c testcase.c -S -o testcase.S The original error occurred when building glibc. I've yet to produce a testcase that triggers gcc to emit the isel instruction but you can see the .machine directive doesn't match up with -mcpu or what gets passed to gas.
