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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/94830] Some concepts diagnostic messages are nondeterministic
Date: Wed, 29 Apr 2020 13:07:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94830

--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppalka@gcc.gnu.org>:

https://gcc.gnu.org/g:a7201a085cc30f89944931d8fb1d7936f02a169f

commit r10-8049-ga7201a085cc30f89944931d8fb1d7936f02a169f
Author: Patrick Palka <ppalka@redhat.com>
Date:   Wed Apr 29 09:04:58 2020 -0400

    c++: Nondeterministic concepts diagnostics [PR94830]

    This patch makes the order in which template parameters appear in the
    TREE_LIST returned by find_template_parameters deterministic between
    runs.

    The current nondeterminism is semantically harmless, but it has the
    undesirable effect of causing some concepts diagnostics which print a
    constraint's parameter mapping via pp_cxx_parameter_mapping to also be
    nondeterministic, as in the testcases below.

    gcc/cp/ChangeLog:

            PR c++/94830
            * pt.c (find_template_parameter_info::parm_list): New field.
            (keep_template_parm): Use the new field to build up the
            parameter list here instead of ...
            (find_template_parameters): ... here.  Return ftpi.parm_list.

    gcc/testsuite/ChangeLog:

            PR c++/94830
            * g++.dg/concepts/diagnostics12.C: Clarify the dg-message now
            that the corresponding diagnostic is deterministic.
            * g++.dg/concepts/diagnostics13.C: New test.=