[Bug ld/19985] New: ld/configure.tgt: enable BE support for ppc64le

[lenohou at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19985

            Bug ID: 19985
           Summary: ld/configure.tgt: enable BE support for ppc64le
           Product: binutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: lenohou at gmail dot com
  Target Milestone: ---

Sorry, We described details in Gentoo Bugzilla#580614. 

1) When use CHOST="powerpc64le-unknown-linux-gnu" to build binutils. there is
no biarch support.See current supported emulations
address@hidden ~ $ powerpc64le-unknown-linux-gnu-ld -V
GNU ld (Gentoo 2.25.1 p1.1) 2.25.1
  Supported emulations:
   elf64lppc
   elf32lppc
   elf32lppclinux
   elf32lppcsim

   But we want elf64ppc for building grub2. If we there is no elf64ppc
emulation, we can't compiling grub2 and grub2-install
for ppc64le platform.

2) Following are the emulations what we want
address@hidden ~ $ powerpc64le-unknown-linux-gnu-ld -V
GNU ld (Gentoo 2.25.1 p1.1) 2.25.1
  Supported emulations:
   elf64lppc
   elf32lppc
   elf32lppclinux
   elf32lppcsim
   elf32ppclinux
   elf32ppc
   elf32ppcsim
   elf64ppc

3) We found that --enable-targets=all make on sense to build the above
emulations what we want, Workaround solution is
--enable-targets="powerpc-linux-gnu" built the targets we want. But, there is
no other arch-specific handling like this.  Instead, binutils itself handles
things by selecting a default set of supported targets based on the active
host.and when i glance in there, 

ld/configure.tgt:
powerpc*-*-elf* | powerpc*-*-eabi* | powerpc*-*-sysv* \
  | powerpc*-*-linux* | powerpc*-*-netbsd* | powerpc*-*-openbsd* \
  | powerpc*-*-solaris* | powerpc*-*-kaos* | powerpc*-*-vxworks*)
             case "${targ}" in
            *64*)   targ_emul=elf64ppc
                targ_extra_emuls="elf32ppc elf32ppclinux elf32ppcsim"
                targ_extra_libpath="elf32ppc elf32ppclinux"
                td=tdir_elf32ppc
                case "${targ}" in
                powerpc*le-*) td=tdir_elf32lppc;;
                esac
                eval ${td}=`echo "${targ_alias}" | sed -e 's/64//'`
                eval ${td}linux=\$${td}
                eval ${td}sim=\$${td}
                ;;

seems there is big-endian support for powerpc64le-unknown-linux-gnu

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