Merge pull request #244406 from amjoseph-nixpkgs/pr/fix/244405

#   https://web.archive.org/web/20170222224855/http://frank.harvard.edu/~coldwell/toolchain/

#   https://web.archive.org/web/20170224235700/http://frank.harvard.edu/~coldwell/toolchain/t-linux.diff

+ lib.optionalString (targetPlatform != hostPlatform && withoutTargetLibc && enableShared)

  (lib.optionalString (!stdenv.targetPlatform.isPower) ''

    echo 'libgcc.a: crti.o crtn.o' >> libgcc/Makefile.in

  '' + ''

    echo 'SHLIB_LC=' >> libgcc/Makefile.in

  (let

    # crt{i,n}.o are the first and last (respectively) object file

    # linked when producing an executable.  Traditionally these

    # files are delivered as part of the C library, but on GNU

    # systems they are in fact built by GCC.  Since libgcc needs to

    # build before glibc, we can't wait for them to be copied by

    # glibc.  At this early pre-glibc stage these files sometimes

    # have different names.

    crtstuff-ofiles =

      if targetPlatform.isPower

      then "ecrti.o ecrtn.o ncrti.o ncrtn.o"

      else "crti.o crtn.o";

    # Normally, `SHLIB_LC` is set to `-lc`, which means that

    # `libgcc_s.so` cannot be built until `libc.so` is available.

    # The assignment below clobbers this variable, removing the

    # `-lc`.

    #

    # On PowerPC we add `-mnewlib`, which means "libc has not been

    # built yet".  This causes libgcc's Makefile to use the

    # gcc-built `{e,n}crt{n,i}.o` instead of failing to find the

    # versions which have been repackaged in libc as `crt{n,i}.o`

    #

    SHLIB_LC = lib.optionalString targetPlatform.isPower "-mnewlib";

  in ''

    echo 'libgcc.a: ${crtstuff-ofiles}' >> libgcc/Makefile.in

    echo 'SHLIB_LC=${SHLIB_LC}' >> libgcc/Makefile.in

  '')

+ lib.optionalString (!enableMultilib && hostPlatform.is64bit && !hostPlatform.isMips64n32) ''

    pkgs.pkgsCross.arm-embedded.stdenv

    pkgs.pkgsCross.m68k.stdenv

    pkgs.pkgsCross.aarch64-multiplatform.pkgsBuildTarget.gcc

    #pkgs.pkgsCross.powernv.pkgsBuildTarget.gcc

    pkgs.pkgsCross.powernv.pkgsBuildTarget.gcc

    pkgs.pkgsCross.mips64el-linux-gnuabi64.stdenv

    pkgs.pkgsCross.mips64el-linux-gnuabin32.stdenv

    pkgs.pkgsCross.mingwW64.stdenv