[Bug c++/99806] [10 Regression] ICE: in tsubst_copy, at cp/pt.c:17247
cvs-commit at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Fri Apr 9 22:47:51 GMT 2021
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99806
--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Marek Polacek
<mpolacek@gcc.gnu.org>:
https://gcc.gnu.org/g:8f4f2fbc17c2a225c29ea20a2b6046cbdc7b3155
commit r10-9691-g8f4f2fbc17c2a225c29ea20a2b6046cbdc7b3155
Author: Marek Polacek <polacek@redhat.com>
Date: Thu Apr 8 14:39:28 2021 -0400
c++: Fix two issues with auto function parameter [PR99806]
When we have a member function with auto parameter like this:
struct S {
void f(auto);
};
cp_parser_member_declaration -> grokfield produces a FUNCTION_DECL
"void S::foo(auto:1)", and then finish_fully_implicit_template turns
that FUNCTION_DECL into a TEMPLATE_DECL. The bug here is that we only
call cp_parser_save_default_args for a FUNCTION_DECL. As a consequence,
abbrev10.C is rejected because we complain that the default argument has
not been defined, and abbrev11.C ICEs, because we don't re-parse the
delayed noexcept, so the DEFERRED_PARSE tree leaks into tsubst* where we
crash. This patch fixes both issues.
gcc/cp/ChangeLog:
PR c++/99806
* parser.c (cp_parser_member_declaration): Call
cp_parser_save_default_args even for function templates. Use
STRIP_TEMPLATE on the declaration we're passing.
gcc/testsuite/ChangeLog:
PR c++/99806
* g++.dg/concepts/abbrev10.C: New test.
* g++.dg/concepts/abbrev11.C: New test.
(cherry picked from commit 625dadaf5df5a2ae0d8c5660fd1eec8ba354479c)
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