[Bug target/69988] libgo.so: undefined reference to `__unorddf2'

[glaubitz at physik dot fu-berlin.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69988

--- Comment #3 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
Looking at the source code, I found this:

ppc_fp_compat=
case ${ppc_fp_type} in
soft|e500v1|e500v2)
  if test $glibc_version_major -gt 2 \
    || ( test $glibc_version_major -eq 2 \
        && test $glibc_version_minor -ge 19 ); then
    ppc_fp_compat="t-softfp-compat"
  fi
  ;;
esac
;;
esac

Which apparently originates here:

> https://patchwork.ozlabs.org/patch/405072/

So, it seems that gcc-5 is relying on glibc for providing the softfloat
functions and those are particularly not present in static libgcc.

The chroot I used for building gcc-5 uses glibc_2.19, so that should be recent
enough. Will try disabling the above code and see what happens.