Re: to Simon Wright, re Mac OS X builds

[Simon Wright <simon@pushface.org>]

Luke A. Guest <laguest@archeia.com> writes:

> Simon Wright <simon@pushface.org> wrote:
>> Lucretia <laguest9000@googlemail.com> writes:
>> 
>>> I'm trying to replicate your build of 6.1.0 for mac so I get an
>>> understanding of the build process on Mac. Problem is, it's
>>> failing. There must be more than what you are telling going on on your
>>> platform.
>> 
>>> checking how to run the C++ preprocessor... /lib/cpp
>>> configure: error: in `/Users/laguest/gcc/build/gcc-6.1.0/gmp':
>>> configure: error: C++ preprocessor "/lib/cpp" fails sanity check
>>> See `config.log' for more details

>> I couldn't reproduce the problem; maybe I made some change which is
>> still there. I don't have any notes about it, but if I did have this
>> problem I would have started looking in config.log.
>
> Yeah I did.
>
>> This message comes from gmp/configure:10323. Why it's looking for
>> /lib/cpp I don't know (/lib doesn't exist); it should be using "g++ -E".
>
> Yea, but if you look , it tries two variations of the above then
> /lib/cpp.  Not sure if that's a mac specific thing, I think it is,
> need to check the actual configure script.  If so this needs a patch i
> think to call xcrun instead, but then I don't know if this is supposed
> to used apple's cop or the GCC one from the cross compiler you
> provided.

The GMP 5.1.3 config seems not to want to use C++, and it's disabled
unless you say --enable-cxx; and I doubt that's done if gmp is linked
into the top-level GCC directory.

> Did you build gmp, mpc, mpfr and isl with apple's tools or with GCC?
> Did you just link in the firs into the GCC root dir?

I've always (since I read that it was possible) linked the maths
packages into the top-level GCC directory and let GCC build them.

   gmp-5.1.3
   mpc-1.0.2
   mpfr-3.1.2