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| author | Patrick Palka <ppalka@redhat.com> | 2021-09-22 11:16:53 -0400 |
|---|---|---|
| committer | Patrick Palka <ppalka@redhat.com> | 2021-09-22 11:16:53 -0400 |
| commit | 9329344a6d81a6a5e3bd171167ebc7b158bb44f4 (patch) | |
| tree | 41b47a7aae6abeccd385c6c3af4ab4024122babf /gcc/fortran/f95-lang.c | |
| parent | 0988829edde6f7357e875ddd2b6ab09de44bea3a (diff) | |
| download | gcc-9329344a6d81a6a5e3bd171167ebc7b158bb44f4.zip gcc-9329344a6d81a6a5e3bd171167ebc7b158bb44f4.tar.gz gcc-9329344a6d81a6a5e3bd171167ebc7b158bb44f4.tar.bz2 | |
c++: concept-ids and value-dependence [PR102412]
The problem here is that uses_template_parms returns true for all
concept-ids (even those with non-dependent arguments), so when a concept-id
is used as a default template argument then during deduction the default
argument is considered dependent even after substituting into it, which
leads to deduction failure (from type_unification_real).
This patch fixes this by implementing the resolution of CWG 2446 which
says a concept-id is dependent only if its arguments are.
DR 2446
PR c++/102412
gcc/cp/ChangeLog:
* constexpr.c (cxx_eval_constant_expression)
<case TEMPLATE_ID_EXPR>: Check value_dependent_expression_p
instead of processing_template_decl.
* pt.c (value_dependent_expression_p) <case TEMPLATE_ID_EXPR>:
Return true only if any_dependent_template_arguments_p.
(instantiation_dependent_r) <case CALL_EXPR>: Remove this case.
<case TEMPLATE_ID_EXPR>: Likewise.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/concepts-nondep2.C: New test.
* g++.dg/cpp2a/concepts-nondep3.C: New test.
Diffstat (limited to 'gcc/fortran/f95-lang.c')
0 files changed, 0 insertions, 0 deletions