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[C++ PATCH] Fix same canonical type node ICE for constrained functions (PR c++/68434)

From: Ryan Burn <rnickb731 at gmail dot com>
To: gcc-patches at gcc dot gnu dot org, Jason Merrill <jason at redhat dot com>
Date: Tue, 24 Nov 2015 07:30:37 -0500
Subject: [C++ PATCH] Fix same canonical type node ICE for constrained functions (PR c++/68434)
Authentication-results: sourceware.org; auth=none

This patch rearranges the step in tsubst where a type's
PLACEHOLDER_TYPE_CONSTRAINTS are set so that it happens before calling
the function canonical_type_parameter.

canonical_type_parameter makes comparisons between types stored in the
canonical_template_parms global variable. One of the steps in
comparing types (equivalent_placeholder_constraints) references the
PLACEHOLDER_TYPE_CONSTRAINTS on types. If constraints aren't set at
this point, types with different PLACEHOLDER_TYPE_CONSTRAINTS can
compare equal and receive the same TYPE_CANONICAL parameter.

Bootstrapped and regression tested on x86_64-linux

2015-11-19  Ryan Burn  <contact@rnburn.com>

      PR c++/68434
       * pt.c (tsubst): Set PLACEHOLDER_TYPE_CONSTRAINTS before
         calling canonical_type_parameter.

       * g++.dg/concepts/pr68434.C: New test

Attachment: pr68434.diff
Description: Text document

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