On 24 Apr 2016 00:46, Leno Hou wrote:
> Hi all,
> 
>  1) As we might know, Gentoo has powerpc64le-unknown-linux-gnu compiler
> 
> leno@localhost ~ $ powerpc64le-unknown-linux-gnu-gcc -v
> 
> Using built-in specs.
> 
> COLLECT_GCC=/usr/powerpc64le-unknown-linux-gnu/gcc-bin/5.3.0/powerpc64le-unknown-linux-gnu-gcc
> 
> COLLECT_LTO_WRAPPER=/usr/libexec/gcc/powerpc64le-unknown-linux-gnu/5.3.0/lto-wrapper
> 
> Target: powerpc64le-unknown-linux-gnu
> 
> Configured with:
> /var/tmp/portage/sys-devel/gcc-5.3.0/work/gcc-5.3.0/configure
> --host=powerpc64le-unknown-linux-gnu --build=powerpc64le-unknown-linux-gnu
> --prefix=/usr --bindir=/usr/powerpc64le-unknown-linux-gnu/gcc-bin/5.3.0
> --includedir=/usr/lib/gcc/powerpc64le-unknown-linux-gnu/5.3.0/include
> --datadir=/usr/share/gcc-data/powerpc64le-unknown-linux-gnu/5.3.0
> --mandir=/usr/share/gcc-data/powerpc64le-unknown-linux-gnu/5.3.0/man
> --infodir=/usr/share/gcc-data/powerpc64le-unknown-linux-gnu/5.3.0/info
> --with-gxx-include-dir=/usr/lib/gcc/powerpc64le-unknown-linux-gnu/5.3.0/include/g++-v5
> --with-python-dir=/share/gcc-data/powerpc64le-unknown-linux-gnu/5.3.0/python
> --enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt
> --disable-werror --with-system-zlib --enable-nls --without-included-gettext
> --enable-checking=release --with-bugurl=https://bugs.gentoo.org/
> --with-pkgversion='Gentoo 5.3.0 p1.0, pie-0.6.5' --enable-libstdcxx-time
> --enable-shared --enable-threads=posix --enable-__cxa_atexit
> --enable-clocale=gnu --disable-multilib --enable-altivec
> --disable-fixed-point --enable-targets=all --disable-libgcj
> --enable-libgomp --disable-libmudflap --disable-libssp --disable-libcilkrts
> --enable-lto --without-isl --enable-libsanitizer
> 
> Thread model: posix
> 
> gcc version 5.3.0 (Gentoo 5.3.0 p1.0, pie-0.6.5)
> 
>   2) And the supported emulations
> 
> leno@localhost ~ $ powerpc64le-unknown-linux-gnu-ld -V
> 
> GNU ld (Gentoo 2.25.1 p1.1) 2.25.1
> 
>   Supported emulations:
> 
>    elf64lppc
> 
>    elf32lppc
> 
>    elf32lppclinux
> 
>    elf32lppcsim
> 
>    3) But when I set CHOST="powerpc64le-unkown-linux-gnu" in Gentoo and
> execute aclocal, automake, libtoolize --copy --force, autoconf. When I
> glance in the latest m4/libtool.m4 :
> 
> if AC_TRY_EVAL(ac_compile); then
>    case `/usr/bin/file conftest.o` in
>      *32-bit*)
>        case $host in
> ...
>          powerpc64le-*linux*)
>            LD="${LD-ld} -m elf32lppclinux"
>            ;;
>          powerpc64-*linux*)
>            LD="${LD-ld} -m elf32ppclinux"
>            ;;
> ...
>      *64-bit*)
>        case $host in
> ...
>          powerpcle-*linux*)
>            LD="${LD-ld} -m elf64lppc"
>            ;;
>          powerpc-*linux*)
>            LD="${LD-ld} -m elf64ppc"
>            ;;
> ...
> 
> seems linked to $LD='$LD-ld -m elf64ppc' and failed to compile packages.
> 
> 
>  4)  Below is my workaround patch and works fine for this case.  If this is
> OK for you, Could this to be merged in upstream? Thanks

your patch looks correct to me.  i'm attaching a version that can be
applied to git since your original looks mangled.
-mike