Re: [PATCH] configure: check for libstdc++ and zlib, dynamic and static

[Bryan Hundven <bryanhundven at gmail dot com>]

On Sat, Jan 22, 2011 at 8:47 AM, Yann E. MORIN
<yann.morin.1998@anciens.enib.fr> wrote:
> Bryan, All,
>
> On Saturday 22 January 2011 00:02:40 Bryan Hundven wrote:
>> configure: check for libstdc++ and zlib, dynamic and static
>>
>> Debian packages both static and dynamic libraries in their -dev package,
>> but Fedora packages them seperately.
>>
>> Normal builds need libstdc++.a, and static toolchains require libz.a to
>> be installed on the host.
>
> And do we need libstdc++ when doing a C-only toolchain? If not, then it
> would be a bit over-stressing to unconditionally require libstdc++.
>
> Well, IIRC, libstdc++ is pulled by one of the companion library (can't
> remember which, though), which comes to be required only with gcc-4.4.
> So if one builds a toolchain with gcc-4.3 or earlier, then libstdc++ is
> not required.
>
> Then, a run-time check like the patch by Anthony would be better, I
> think. And it should be conditional to requiring libstdc++. Something
> in scripts/build/cc/gcc.sh, like:
> Â Â[...]
> Â Âlibstdcxx_required=blabla
> Â Âif [ "${libstdcxx_required}" = "y" ]; then
> Â Â Â Â# Same test as suggested by Anthony
> Â Âfi
> Â Â[...]

I think both a configure time warning and a runtime check would be
helpful. I would hate to have gotten part way through the build to
find out I was missing a static library on my build box.

Maybe If I got a warning during configuration saying:
"Warning: Some configurations require <some library> that seems to be
missing on your computer."

And use Tony's patch to check during runtime and error out.

> This is gcc-specific, so has to go into the gcc build script. The issue
> with that is the test will occur only after some time has elapsed. If we
> could do it earlier in the process, that'd be nice.
>
> Maybe we could generalise the do_libc_check_config, and add such a step
> to all components, to give them the oportunity to bail-out early if
> something is wrong, that we can not test at ./configure-time.
>
> Regards,
> Yann E. MORIN.
>
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