As part of resolving PR 91828, the minimum MPFR version required to build GCC was bumped to 3.1.0 from the previous 2.4.0. This enables a bunch of cleanups, mostly in the Fortran frontend (hence assigning this bug to the fortran component). From https://gcc.gnu.org/ml/gcc-patches/2016-04/msg01544.html : > For example, you could justify a move to requiring MPFR 3.0.0 or later with cleanups to use MPFR_RND* instead of the older GMP_RND*, and similarly mpfr_rnd_t instead of the older mp_rnd_t and likewise mpfr_exp_t and mpfr_prec_t in fortran/. You could justify a move to requiring MPC 1.0.0 (or 1.0.2) by optimizing clog10 using mpc_log10. I don't know what if any newer GMP interfaces would be beneficial in GCC. And as always in such cases, it's a good idea to look at e.g. how widespread the newer versions are in GNU/Linux distributions, which indicates how many people might be affected by an increase in the version requirement.

Seems r269139 can be reverted, that's apparently a patch to fix some accidental breakage due to depending on a too new MPFR version.

Author: jb Date: Wed Nov 20 20:01:25 2019 New Revision: 278523 URL: https://gcc.gnu.org/viewcvs?rev=278523&root=gcc&view=rev Log: PR 92463 MPFR modernization in GFortran Now that we require a minimum of MPFR 3.1.0+ to build GCC, we can do some modernization of the MPFR usage in the GFortran frontend. This patch replaces 1) GMP_RND* with MPFR_RND* 2) mp_exp_t with mpfr_exp_t 3) mp_prec_t with mpfr_prec_t 4) mp_rnd_t with mpfr_rnd_t gcc/fortran/ChangeLog: 2019-11-20 Janne Blomqvist <jb@gcc.gnu.org> PR fortran/92463 * arith.c (gfc_mpfr_to_mpz): Change mp_exp_t to mpfr_exp_t. (gfc_check_real_range): Likewise. * gfortran.h (GFC_RND_MODE): Change GMP_RNDN to MPFR_RNDN. * module.c (mio_gmp_real): Change mp_exp_t to mpfr_exp_t. * simplify.c (degrees_f): Change mp_rnd_t to mpfr_rnd_t. (radians_f): Likewise. (fullprec_erfc_scaled): Change mp_prec_t to mpfr_prec_t. (asympt_erfc_scaled): Likewise. (gfc_simplify_nearest): Change mp_exp_t to mpfr_exp_t, and GMP_RND* to MPFR_RND*. Modified: trunk/gcc/fortran/ChangeLog trunk/gcc/fortran/arith.c trunk/gcc/fortran/gfortran.h trunk/gcc/fortran/module.c trunk/gcc/fortran/simplify.c

Author: jb Date: Wed Nov 20 20:08:29 2019 New Revision: 278525 URL: https://gcc.gnu.org/viewcvs?rev=278525&root=gcc&view=rev Log: PR 92463 MPFR modernization: Revert r269139 Commit r269139 fixed an accidental dependency on MPFR 3.0. As we now require at least MPFR 3.1.0+ we can revert it and instead use the simpler MPFR 3.0+ code. ChangeLog entry of the original commit was: 2019-02-23 David Malcolm <dmalcolm@redhat.com> Jakub Jelinek <jakub@redhat.com> PR middle-end/88074 * simplify.c (norm2_do_sqrt, gfc_simplify_norm2): Use mpfr_number_p && !mpfr_zero_p instead of mpfr_regular_p. (norm2_add_squared): Likewise. Use mp_exp_t rather than mpfr_exp_t. ChangeLog for this commit: 2019-11-20 Janne Blomqvist <jb@gcc.gnu.org> PR fortran/92463 Revert r269139 * simplify.c (norm2_do_sqrt, gfc_simplify_norm2): Use mpfr_regular_p instead of mpfr_number_p && !mpfr_zero_p. (norm2_add_squared): Likewise. Use mpfr_exp_t rather than mp_exp_t. Modified: trunk/gcc/fortran/ChangeLog trunk/gcc/fortran/simplify.c

Fortran parts done, reassigning to middle-end as there are similar MPFR modernization opportunities there.

(In reply to Janne Blomqvist from comment #4) > Fortran parts done, reassigning to middle-end as there are similar MPFR > modernization opportunities there. See also https://gcc.gnu.org/ml/gcc-patches/2019-11/msg01969.html for grep for the files where the type changes should be applied. Background: r278058 changed the minimal version from 2.4.0 to 3.1.0. The main changes are listed at https://www.mpfr.org/mpfr-3.0.0/#changes and https://www.mpfr.org/mpfr-3.1.0/#changes At a glance, I did not see function-call changes but I did just a simple grep with glancing at the code. New but probably not needed is a function to set zero (with + or - sign) and rounding away from zero (see MPFR changes linked above).

Author: burnus Date: Wed Nov 27 09:16:24 2019 New Revision: 278761 URL: https://gcc.gnu.org/viewcvs?rev=278761&root=gcc&view=rev Log: PR 92463 - Cleanups due to minimum MPFR version bump to 3.1.0 PR middle-end/92463 * configure.ac: Use MPFR_RNDN instead of GMP's MP_RNDN. * configure: Regenerate gcc/ PR middle-end/92463 * builtins.c (do_mpfr_ckconv, do_mpc_ckconv, do_mpfr_remquo, do_mpfr_lgamma_r, do_mpc_arg2): Use MPFR_RNDx instead of GMP_RNDx, mpfr_rnd_t instead of mp_rnd_t. * fold-const-call.c (do_mpfr_ckconv, do_mpfr_arg1, do_mpfr_sincos, do_mpfr_arg2, do_mpfr_arg3, do_mpc_arg1, do_mpc_arg2): Likewise. * gimple-ssa-sprintf.c (format_floating_max, format_floating): Use mpfr_exp_t instead of mp_exp_t. * real.c (real_from_string, dconst_e_ptr, dconst_sqrt2_ptr): Use MPFR_RNDx instead of GMP_RNDx. * realmpfr.c (real_from_mpfr, mpfr_from_real): Use mpfr_rnd_t and mpfr_exp_t instead mp_rnd_t and mp_exp_t, respectively. * realmpfr.h (real_from_mpfr, mpfr_from_real): Use mpfr_rnd_t instead of mp_rnd_t and remove MPFR_RNDx poisoning. * ubsan.c (ubsan_instrument_float_cast): MPFR_RNDx instead of GMP_RNDx. fortran/ PR middle-end/92463 * arith.c (gfc_check_real_range): Replace mp_exp_t by mpfr_exp_t. Modified: trunk/ChangeLog trunk/configure trunk/configure.ac trunk/gcc/ChangeLog trunk/gcc/builtins.c trunk/gcc/fold-const-call.c trunk/gcc/fortran/ChangeLog trunk/gcc/fortran/arith.c trunk/gcc/gimple-ssa-sprintf.c trunk/gcc/real.c trunk/gcc/realmpfr.c trunk/gcc/realmpfr.h trunk/gcc/ubsan.c

The middle end is fixed – The Go front end remains – but won't be tackled by me. Re-assign to the 'Go' component.

The master branch has been updated by Ian Lance Taylor <ian@gcc.gnu.org>: https://gcc.gnu.org/g:2f195832a12ff4fb54d723f32019d4175db1b5da commit r10-6267-g2f195832a12ff4fb54d723f32019d4175db1b5da Author: Ian Lance Taylor <iant@golang.org> Date: Fri Jan 24 12:39:23 2020 -0800 compiler: cleanups permitted by GCC requirement of MPFR 3.1.0 For MPFR functions, change from GMP_RND* to MPFR_RND*. Also change mp_exp_t to mpfr_expt_t. Fixes PR go/92463 Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/216417

Go frontend is fixed.