[racket] Failed to build Racket Textual 5.1.2 (CentOS)

The problem seems to be that __sync_bool_compare_and_swap() is
available only when the compiler knows that its generating code for
i486 or up, and it's not available when compiling for i386.

The Racket headers files try to use C pre-processor tests to decide
whether to use __sync_bool_compare_and_swap(), but a `configure' test
will be more reliable. I'll push that change.

Meanwhile, the workarounds are either to add something like
"-march=i486" to CFLAGS or change "mzrt.h" at line 89 to `#if 1'.

At Fri, 12 Aug 2011 16:50:16 -0300, Rodolfo Carvalho wrote:
> Hello,
> 
> I checked that the version of GCC in the machine is way too old.
> GCC's website tells that GCC 4.4.6 is the oldest maintained release series.
> 
> So maybe it's better to don't invest any time in "fixing" anything.
> I have a possibility to migrate to a newer server at Webfaction with newer
> GCC.
> 
> Thanks,
> 
> Rodolfo Carvalho
> 
> 
> On Fri, Aug 12, 2011 at 12:15, Rodolfo Carvalho <rhcarvalho at gmail.com>wrote:
> 
> > On Fri, Aug 12, 2011 at 11:06, Matthew Flatt <mflatt at cs.utah.edu> wrote:
> >
> >> We've made some repairs in that area since 5.1.2, but I don't know if
> >> we've solved the problem that you're seeing. Which version of gcc are
> >> you using?
> >>
> >>
> > $ gcc --version
> > gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-50)
> >
> >
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