https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82734
Bug ID: 82734
Summary: -Wignored-qualifiers is maybe too strict when using
decltype
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: sylvestre at debian dot org
Target Milestone: ---
With the following code:
#include <stdint.h>
#include <assert.h>
void foo() {
const int BLOCK_SIZE = 42;
static_assert(
BLOCK_SIZE <
static_cast<decltype(BLOCK_SIZE)>(INT32_MAX));
}
----
# g++-7 -c -Wall -Wignored-qualifiers foo.cpp
# g++-8 -c -Wall -Wignored-qualifiers foo.cpp
foo.cpp: In function 'void foo()':
foo.cpp:9:50: warning: type qualifiers ignored on cast result type
[-Wignored-qualifiers]
static_cast<decltype(BLOCK_SIZE)>(INT32_MAX));
^
----
Either:
* The warning is too strict. In some cases, I don't control what BLOCK_SIZE can
be and the const isn't a big deal
* I should have in the warning the definition of BLOCK_SIZE to have an idea of
what is going on.
