We already know to treat a variable of array-of-unknown-bound type as dependent, we should do the same for arr{}.
Tested x86_64-pc-linux-gnu, applying to trunk. 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. --- gcc/cp/pt.cc | 6 +-- gcc/testsuite/g++.dg/cpp0x/initlist-array17.C | 37 +++++++++++++++++++ 2 files changed, 40 insertions(+), 3 deletions(-) create mode 100644 gcc/testsuite/g++.dg/cpp0x/initlist-array17.C 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(); +} base-commit: 7c989a8ed47228bdd494a2f0d1f6fdd325f953d7 -- 2.31.1