Re: Newer hwcap failures

[Florian Weimer <fweimer@redhat.com>]

* Szabolcs Nagy:

> The 01/29/2021 10:20, Florian Weimer via Libc-alpha wrote:
>> * Adhemerval Zanella:
>> 
>> > The issue is test-container is copying the ld.so.cache from system into
>> > testroot and thus _dl_sysdep_read_whole_file does not fail.
>> >
>> > For 32-bit builds, there is not ld.so.cache then _dl_sysdep_read_whole_file
>> > fails and further ldconfig does not change the process map (since
>> > _dl_load_cache_lookup won't reload the cache after an initial failure).
>> >
>> > That's explain why I am seeing this only on system with default 64-bit
>> > userland.  I don't know exactly why I haven't see this before, neither
>> > if it were some testing regression added recently.
>> 
>> I can't reproduce this (with an x86-64 host and a multilib toolchain).
>> Does it require an i386 chroot to reproduce?
>
> i see those tests fail with a config.make that has
>
> cross-compiling = maybe
>
> then /etc/ld.so.cache is missing from the install
> directory (since ldconfig is not run)
>
> i normally use a i686-linux-gnu toolchain on an
> x86_64 machine to test i686, not a chroot/container.
> in an i686 container with native gcc the tests pass.

Hmm, how do you get that maybe?  Do you rebuild ./configure using
autoconf 2.70 or later?

I see this in the configure file we ship:

# There might be people who depend on the old broken behavior: `$host'
# used to hold the argument of --host etc.
# FIXME: To remove some day.
build=$build_alias
host=$host_alias
target=$target_alias

# FIXME: To remove some day.
if test "x$host_alias" != x; then
  if test "x$build_alias" = x; then
    cross_compiling=maybe
  elif test "x$build_alias" != "x$host_alias"; then
    cross_compiling=yes
  fi
fi

I configure glibc with --build=i686-linux-gnu, and that gives me
“cross-compiling = no” in config.make.

Thanks,
Florian
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