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From: Jason Merrill <jason@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r13-2631] c++: cast to array of unknown bound [PR93259] Date: Mon, 12 Sep 2022 19:47:06 +0000 (GMT) [thread overview] Message-ID: <20220912194706.16E25385C335@sourceware.org> (raw) https://gcc.gnu.org/g:6bcca5f642eb950a3cef024ea49a35e4792306f6 commit r13-2631-g6bcca5f642eb950a3cef024ea49a35e4792306f6 Author: Jason Merrill <jason@redhat.com> Date: Mon Sep 12 14:14:24 2022 -0400 c++: cast to array of unknown bound [PR93259] We already know to treat a variable of array-of-unknown-bound type as dependent, we should do the same for arr{}. PR c++/93259 gcc/cp/ChangeLog: * pt.cc (type_dependent_expression_p): Treat a compound literal of array-of-unknown-bound type like a variable. gcc/testsuite/ChangeLog: * g++.dg/cpp0x/initlist-array17.C: New test. Diff: --- gcc/cp/pt.cc | 6 ++--- gcc/testsuite/g++.dg/cpp0x/initlist-array17.C | 37 +++++++++++++++++++++++++++ 2 files changed, 40 insertions(+), 3 deletions(-) diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc index ad9c2f9b180..31e3e391098 100644 --- a/gcc/cp/pt.cc +++ b/gcc/cp/pt.cc @@ -28082,11 +28082,11 @@ type_dependent_expression_p (tree expression) If the array has no length and has an initializer, it must be that we couldn't determine its length in cp_complete_array_type because it is dependent. */ - if (VAR_P (expression) + if (((VAR_P (expression) && DECL_INITIAL (expression)) + || COMPOUND_LITERAL_P (expression)) && TREE_TYPE (expression) != NULL_TREE && TREE_CODE (TREE_TYPE (expression)) == ARRAY_TYPE - && !TYPE_DOMAIN (TREE_TYPE (expression)) - && DECL_INITIAL (expression)) + && !TYPE_DOMAIN (TREE_TYPE (expression))) return true; /* Pull a FUNCTION_DECL out of a BASELINK if we can. */ diff --git a/gcc/testsuite/g++.dg/cpp0x/initlist-array17.C b/gcc/testsuite/g++.dg/cpp0x/initlist-array17.C new file mode 100644 index 00000000000..c4284a7b391 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp0x/initlist-array17.C @@ -0,0 +1,37 @@ +// PR c++/93259 +// { dg-do compile { target c++11 } } + +template <class T, class U> struct is_same; +template <class T> struct is_same<T,T> { }; + +using Array = int[]; + +template <typename ...Ts> +void bar1(Ts ...) +{ + auto && array = Array{ 1, 2, 3 }; + + is_same<int (&&)[3], decltype(array)>{}; // this fails, deduces array as int (&&) [] +} + +template <typename T> +void bar2() +{ + auto && array = Array{ 1, 2, 3 }; + + is_same<int (&&)[3], decltype(array)>{}; // this fails, deduces array as int (&&) [] +} + +void bar3() +{ + auto && array = Array{ 1, 2, 3 }; + + is_same<int (&&)[3], decltype(array)>{}; // OK +} + +int main() +{ + bar1<int>(1, 2, 3); + bar2<int>(); + bar3(); +}
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