From e971990cbda091b4caf5e1a5bded5121068934e4 Mon Sep 17 00:00:00 2001 From: Patrick Palka Date: Fri, 28 Jan 2022 15:41:15 -0500 Subject: [PATCH] c++: bogus warning with value init of const pmf [PR92752] Here we're emitting a -Wignored-qualifiers warning for an intermediate compiler-generated cast of nullptr to 'method-type* const' as part of value initialization of a const pmf. This patch suppresses the warning by instead casting to the corresponding unqualified type. PR c++/92752 gcc/cp/ChangeLog: * typeck.cc (build_ptrmemfunc): Cast a nullptr constant to the unqualified pointer type not the qualified one. gcc/testsuite/ChangeLog: * g++.dg/warn/Wignored-qualifiers2.C: New test. Co-authored-by: Jason Merrill --- gcc/cp/typeck.cc | 4 +++- gcc/testsuite/g++.dg/warn/Wignored-qualifiers2.C | 17 +++++++++++++++++ 2 files changed, 20 insertions(+), 1 deletion(-) create mode 100644 gcc/testsuite/g++.dg/warn/Wignored-qualifiers2.C diff --git a/gcc/cp/typeck.cc b/gcc/cp/typeck.cc index 11c9d8a..50d04c1 100644 --- a/gcc/cp/typeck.cc +++ b/gcc/cp/typeck.cc @@ -9593,7 +9593,9 @@ build_ptrmemfunc (tree type, tree pfn, int force, bool c_cast_p, /* Handle null pointer to member function conversions. */ if (null_ptr_cst_p (pfn)) { - pfn = cp_build_c_cast (input_location, type, pfn, complain); + pfn = cp_build_c_cast (input_location, + TYPE_PTRMEMFUNC_FN_TYPE_RAW (to_type), + pfn, complain); return build_ptrmemfunc1 (to_type, integer_zero_node, pfn); diff --git a/gcc/testsuite/g++.dg/warn/Wignored-qualifiers2.C b/gcc/testsuite/g++.dg/warn/Wignored-qualifiers2.C new file mode 100644 index 0000000..c4c3754 --- /dev/null +++ b/gcc/testsuite/g++.dg/warn/Wignored-qualifiers2.C @@ -0,0 +1,17 @@ +// PR c++/92752 +// { dg-do compile } +// { dg-additional-options "-Wignored-qualifiers" } + +struct X; + +template +struct Wrap { + T data; + Wrap() : data() {} +}; + +typedef int (X::*type)(); +Wrap x; +#if __cpp_initializer_lists +const type t{}; +#endif -- 2.7.4