[PATCH v3] change ifunc assembly test to a link test

[Roland McGrath]

>  # For the multi-arch option we need support in the assembler.
>  AC_CACHE_CHECK([for assembler gnu_indirect_function symbol type support],
> -	       libc_cv_asm_gnu_indirect_function, [dnl
> +	       libc_cv_ld_gnu_indirect_function, [dnl

You forgot to change the message (and the comment):

# To use IFUNC for multi-arch or other purposes, we need in the assembler
# and linker.
AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],

> +  # Do a link to see if the backend supports IFUNC relocs.
> +  $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
> +  LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
> +    libc_cv_ld_gnu_indirect_function=yes
> +  }

This is subject to false-negatives if there is some unexpected weirdness
with readelf or something.  But I'm not too concerned.

The change is OK with the fixes above.


Thanks,
Roland