From: Jason Merrill Date: Wed, 5 Aug 2015 17:56:14 +0000 (-0400) Subject: re PR c++/66260 ([C++14] Failure to compile variable template with recursively define... X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=dc062b4986328bfeec3ebd744a9c116e28828bf0;p=gcc.git re PR c++/66260 ([C++14] Failure to compile variable template with recursively defined partial specialization) PR c++/66260 PR c++/66596 PR c++/66649 PR c++/66923 * pt.c (lookup_template_variable): Use NULL_TREE for type. (instantiate_template_1): Also set DECL_TI_ARGS based on the immediate parent. (tsubst_copy_and_build) [TEMPLATE_ID_EXPR]: Handle variable templates. (finish_template_variable): Add complain parm. * cp-tree.h: Adjust. From-SVN: r226642 --- diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog index 382ad9a8a4b..e0075e0e981 100644 --- a/gcc/cp/ChangeLog +++ b/gcc/cp/ChangeLog @@ -1,5 +1,16 @@ 2015-08-05 Jason Merrill + PR c++/66260 + PR c++/66596 + PR c++/66649 + PR c++/66923 + * pt.c (lookup_template_variable): Use NULL_TREE for type. + (instantiate_template_1): Also set DECL_TI_ARGS based on + the immediate parent. + (tsubst_copy_and_build) [TEMPLATE_ID_EXPR]: Handle variable templates. + (finish_template_variable): Add complain parm. + * cp-tree.h: Adjust. + PR c++/65195 PR c++/66619 * semantics.c (finish_id_expression): Call convert_from_reference diff --git a/gcc/cp/cp-tree.h b/gcc/cp/cp-tree.h index 63fd6e9fc77..e70dcb45a37 100644 --- a/gcc/cp/cp-tree.h +++ b/gcc/cp/cp-tree.h @@ -5954,7 +5954,7 @@ extern tree perform_koenig_lookup (tree, vec *, tsubst_flags_t); extern tree finish_call_expr (tree, vec **, bool, bool, tsubst_flags_t); -extern tree finish_template_variable (tree); +extern tree finish_template_variable (tree, tsubst_flags_t = tf_warning_or_error); extern tree finish_increment_expr (tree, enum tree_code); extern tree finish_this_expr (void); extern tree finish_pseudo_destructor_expr (tree, tree, tree, location_t); diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c index 7ad23341ca2..f8c123c1313 100644 --- a/gcc/cp/pt.c +++ b/gcc/cp/pt.c @@ -8187,14 +8187,14 @@ lookup_template_class (tree d1, tree arglist, tree in_decl, tree context, tree lookup_template_variable (tree templ, tree arglist) { - tree type = unknown_type_node; + tree type = NULL_TREE; return build2 (TEMPLATE_ID_EXPR, type, templ, arglist); } /* Instantiate a variable declaration from a TEMPLATE_ID_EXPR for use. */ tree -finish_template_variable (tree var) +finish_template_variable (tree var, tsubst_flags_t complain) { tree templ = TREE_OPERAND (var, 0); @@ -8203,7 +8203,6 @@ finish_template_variable (tree var) arglist = add_outermost_template_args (tmpl_args, arglist); tree parms = DECL_TEMPLATE_PARMS (templ); - tsubst_flags_t complain = tf_warning_or_error; arglist = coerce_innermost_template_parms (parms, arglist, templ, complain, /*req_all*/true, /*use_default*/true); @@ -14750,6 +14749,17 @@ tsubst_copy_and_build (tree t, if (targs) targs = tsubst_template_args (targs, args, complain, in_decl); + if (variable_template_p (templ)) + { + templ = lookup_template_variable (templ, targs); + if (!any_dependent_template_arguments_p (targs)) + { + templ = finish_template_variable (templ, complain); + mark_used (templ); + } + RETURN (convert_from_reference (templ)); + } + if (TREE_CODE (templ) == COMPONENT_REF) { object = TREE_OPERAND (templ, 0); @@ -16153,6 +16163,7 @@ instantiate_template_1 (tree tmpl, tree orig_args, tsubst_flags_t complain) /* The DECL_TI_TEMPLATE should always be the immediate parent template, not the most general template. */ DECL_TI_TEMPLATE (fndecl) = tmpl; + DECL_TI_ARGS (fndecl) = targ_ptr; /* Now we know the specialization, compute access previously deferred. */ diff --git a/gcc/testsuite/g++.dg/cpp1y/var-templ32.C b/gcc/testsuite/g++.dg/cpp1y/var-templ32.C index d9d2fff37f8..80077a16b56 100644 --- a/gcc/testsuite/g++.dg/cpp1y/var-templ32.C +++ b/gcc/testsuite/g++.dg/cpp1y/var-templ32.C @@ -4,4 +4,4 @@ template bool V1 = true; template -bool V1 = false; // { dg-error "primary template" } +bool V1 = false; // { dg-error "primary template|not deducible" } diff --git a/gcc/testsuite/g++.dg/cpp1y/var-templ35.C b/gcc/testsuite/g++.dg/cpp1y/var-templ35.C index c2c58aca4aa..5ed0abca4bc 100644 --- a/gcc/testsuite/g++.dg/cpp1y/var-templ35.C +++ b/gcc/testsuite/g++.dg/cpp1y/var-templ35.C @@ -2,4 +2,4 @@ // { dg-do compile { target c++14 } } template int typeID{42}; -template double typeID{10.10}; // { dg-error "primary template|redeclaration" } +template double typeID{10.10}; // { dg-error "primary template|redeclaration|not deducible" } diff --git a/gcc/testsuite/g++.dg/cpp1y/var-templ36.C b/gcc/testsuite/g++.dg/cpp1y/var-templ36.C new file mode 100644 index 00000000000..760e36fca44 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp1y/var-templ36.C @@ -0,0 +1,15 @@ +// { dg-do compile { target c++14 } } + +template +constexpr T v = T(); + +template +constexpr T v = T(); + +template +struct A { + static constexpr decltype (v) v = ::v; +}; + +double d1 = v; +double d2 = A::v; diff --git a/gcc/testsuite/g++.dg/cpp1y/var-templ38.C b/gcc/testsuite/g++.dg/cpp1y/var-templ38.C new file mode 100644 index 00000000000..1fd76d38d4b --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp1y/var-templ38.C @@ -0,0 +1,9 @@ +// PR c++/66596 +// { dg-do compile { target c++14 } } + +struct U { void f() {} }; +struct V { void f() {} }; +template U t; +template<> V t; +template void g() { t.f(); } +int main() { g(); } diff --git a/gcc/testsuite/g++.dg/cpp1y/var-templ39.C b/gcc/testsuite/g++.dg/cpp1y/var-templ39.C new file mode 100644 index 00000000000..e06519d5482 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp1y/var-templ39.C @@ -0,0 +1,16 @@ +// PR c++/66260 +// { dg-do compile { target c++14 } } + +template +constexpr bool foo = false; +template <> +constexpr bool foo = true; +template +constexpr bool foo = foo; + +static_assert(foo, ""); +static_assert(!foo, ""); +static_assert(foo, ""); +static_assert(!foo, ""); +static_assert(foo, ""); +static_assert(!foo, "");