Build failure with mpfr-4.1.1 and cgal-5.5

[dwightkelly]

OpenSCAD fails to build against mpfr-4.1.1 and cgal-5.5.
This is most likely an upstream bug in MPFR:

• Compatibility issue with mpfr 4.1.1 CGAL/cgal#7064
• https://gitlab.inria.fr/mpfr/mpfr/-/issues/1
• https://www.mpfr.org/mpfr-4.1.1/#bugs

Looks like it will be fixed in mpfr-4.2

Was:

Apple clang version 14.0.0 (clang-1400.0.29.202)
Target: x86_64-apple-darwin21.6.0
OS: macOS 12.6.1 Intel
openscad @2015.03-3_9 (installed using macport)

:info:build In file included from src/LibraryInfo.cc:15:
:info:build In file included from src/cgal.h:24:
:info:build In file included from /opt/local/include/CGAL/Gmpq.h:26:
:info:build In file included from /opt/local/include/CGAL/Gmpz.h:34:
:info:build In file included from /opt/local/include/CGAL/Gmp_coercion_traits.h:33:
:info:build /opt/local/include/CGAL/GMP/Gmpfr_type.h:208:25: error: cannot initialize a variable of type 'mpfr_ptr' (aka '__mpfr_struct *') with an lvalue of type 'mpfr_srcptr' (aka 'const __mpfr_struct *')
:info:build                         mpfr_custom_get_kind(f),
:info:build                         ^~~~~~~~~~~~~~~~~~~~~~~~
:info:build /opt/local/include/mpfr.h:1030:14: note: expanded from macro 'mpfr_custom_get_kind'
:info:build     mpfr_ptr _x = (x);                                                  \
:info:build              ^
:info:build /opt/local/include/mpfr.h:1010:9: note: expanded from macro 'mpfr_custom_init_set'
:info:build   _k = (k);                                                    \
:info:build         ^

[kintel]

"openscad@2015.03-3_9" - this is an ancient version of OpenSCAD. If you really want to get this working on MacPorts, I would suggest either upgrading the MacPorts build or work with the MacPorts maintainer (if they're still active), or report a bug against MacPorts: https://ports.macports.org/port/openscad/

For an easier path, we do offer pre-compiled binaries at https://openscad.org/downloads.html

[dwightkelly]

I would recommend deleting the macport listing on your website.

[t-paul]

CGAL issue mentions this is actually a MPFR-4.1.1 bug - CGAL/cgal#7064

[kintel]

Good find @t-paul - I've verified that building against mpfr-4.1.1 and cgal-5.5 fails on master as well.
Reopening and renaming for tracking.

[kintel]

..but since neither MacPorts or Homebrew packages are maintained, we should perhaps not recommend them.