Re: [xml] libxml port to QCDOC.

[Daniel Veillard <veillard redhat com>]

On Wed, Oct 22, 2003 at 10:34:11AM +0100, Balint Joo wrote:
> Hi,
>       I have compiled up libxml2 (version 2.5.1 for now) on a
> prototype node of a QCDOC supercomputer. I am really impressed
> that fundamentally the whole thing just worked (even though
> it went through a cross compile) Well done you all.
> (Incidentally for more info on the QCDOC supercomputer, visit:
>   http://www.phys.columbia.edu/~cqft or just type QCDOC into Google)

  "Runs everywhere" !
  That looks like a fun box to work with :-)

> However, our toolchain and operating system is restricted on the QCDOC,
> in particular a couple of UNIX/POSIX functions are missing from
> our OS or are not available to users (such as getcwd and stat).
>
> Alas this is the sorrow of having a homebrew OS. In any case, I found
> that in the config.h file, I can #undef HAVE_STAT, and for getcwd
> I just return "/" all the time. However, it would be nice if I could
> somehow tell ./configure to #undef HAVE_STAT. As it is it will probe
> for stat and find the newlib stub (which is not really functional in
> our case).

  Hum, the simplest would be to change configure.in to detect your 
specific target (the one your use for the cross compile) and then undo
the configure probes, or avoid doing them.
  
> For the now we could certainly proceed in such a way, that I configure
> as normal, and some post processing script undefines HAVE_STAT in the
> config.h file. The ultimate cleanest way of doing things would be
> to hide our stat function stub so that the configure script won't find it,
> however this may be invasive to newlib which is also undersirable.
> Would it perhaps be reasonable possible to patch the configure script
> by adding a --disable-statfunc switch?  I

  Hum, no, patching the configure.in to make special work for your
target is the cleanest option in my opinion. I take patches (to
configure.in not to configure, which is generated from it).

Daniel

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