From c1c62aec6751678e958ab5c61b2d903a09d7efd9 Mon Sep 17 00:00:00 2001 From: Patrick Palka Date: Thu, 8 Oct 2020 00:05:41 -0400 Subject: c++: ICE in dependent_type_p with constrained auto [PR97052] This patch fixes an "unguarded" call to coerce_template_parms in build_standard_check: processing_template_decl could be zero if we get here during processing of the first 'auto' parameter of an abbreviated function template, or if we're processing the type constraint of a non-templated variable. In the testcase below, this leads to an ICE when coerce_template_parms instantiates C's dependent default template argument. gcc/cp/ChangeLog: PR c++/97052 * constraint.cc (build_type_constraint): Temporarily increment processing_template_decl before calling build_concept_check. * pt.c (make_constrained_placeholder_type): Likewise. gcc/testsuite/ChangeLog: PR c++/97052 * g++.dg/cpp2a/concepts-defarg2.C: New test. --- gcc/cp/constraint.cc | 2 ++ 1 file changed, 2 insertions(+) (limited to 'gcc/cp/constraint.cc') diff --git a/gcc/cp/constraint.cc b/gcc/cp/constraint.cc index d49957a..050b55c 100644 --- a/gcc/cp/constraint.cc +++ b/gcc/cp/constraint.cc @@ -1427,7 +1427,9 @@ tree build_type_constraint (tree decl, tree args, tsubst_flags_t complain) { tree wildcard = build_nt (WILDCARD_DECL); + ++processing_template_decl; tree check = build_concept_check (decl, wildcard, args, complain); + --processing_template_decl; if (check == error_mark_node) return error_mark_node; return unpack_concept_check (check); -- cgit v1.1