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

["Yann E. MORIN" <yann dot morin dot 1998 at anciens dot enib dot fr>]

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:
    [...]
    libstdcxx_required=blabla
    if [ "${libstdcxx_required}" = "y" ]; then
        # Same test as suggested by Anthony
    fi
    [...]

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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