Compiling GMP dependency

[Jonathan Wakely]

On Mon, 30 Sept 2024, 13:02 Hans Åberg, <haberg_1@icloud.com> wrote:

>
> > On 30 Sep 2024, at 11:38, Jonathan Wakely <jwakely.gcc@gmail.com> wrote:
> >
> > On Mon, 30 Sept 2024 at 08:25, Hans Åberg <haberg_1@icloud.com> wrote:
> >>
> >>
> >>> On 30 Sep 2024, at 09:20, Jonathan Wakely via Gcc-help <
> gcc-help@gcc.gnu.org> wrote:
> >>>
> >>> On Sun, 29 Sept 2024, 21:15 Hans Åberg via Gcc-help, <
> gcc-help@gcc.gnu.org>
> >>> wrote:
> >>>
> >>>> There is a recursive package issue on MacPorts [1] on how to compile
> GMP
> >>>> for the GCC build:
> >>>>
> >>>> GMP 'make check' fails with Clang if assembly is enabled, but passes
> with
> >>>> GCC, and also with Clang if assembly is disabled.
> >>>>
> >>>> So the question is how to set the build of GCC, specifically, is GMP
> used
> >>>> only for the build, or also when it is run?
> >>>>
> >>>
> >>> The GCC compiler binaries are linked to libgmp and use some of its
> >>> functions when compiling user code.
> >>
> >> Is GMP used otherwise for the build itself?
> >
> > Yes, the GCC compiler binaries use it, and those binaries are used
> > during bootstrap.
> > I don't know whether they use the parts of your libgmp.dylib that
> > misbehave when using Clang. That would require finding out exactly
> > which parts of gmp are incorrect, …
>
> It may be Clang that is incorrect, ditching the C/C++ standards in favor
> if mainstream programming.
>
> > …and whether each of those is ever
> > used during GCC bootstrap.
> >
> > If you want to avoid rebuilding GMP after bootstrapping GCC and then
> > rebuild GCC as well, the simplest solution would be to use the
> > download_prerequisites script as described at
> > https://gcc.gnu.org/wiki/InstallingGCC
> > That will build GMP as part of the GCC bootstrap, linking statically
> > to it (so the Clang-built libgmp.dylib already on the system won't be
> > used).
>
> Is that script tried on MacOS?




Not by me.


—An old man page for ld said that on MacOS, static linking is only for
> building the Mach kernel, and one cannot mix static and dynamic linking.
>
> >>>> 1. https://trac.macports.org/ticket/70859
>
>