http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59624
Bug ID: 59624
Summary: bizarre warning about 'assigned but unused parameter'
in ctor
Product: gcc
Version: 4.7.2
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mw_triad at users dot sourceforge.net
Created attachment 31538
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31538&action=edit
SSCCE showing the bug
Consider the following code:
// foo is a class, rc is an enum class
foo::foo(rc c) : v{static_cast<int>(c)} {}
g++ with -std=c++11 -Wall -Wextra warns:
foo.cpp:8:3: warning: parameter ‘c’ set but not used
[-Wunused-but-set-parameter]
...but there is no assignment occurring?!
I suspect under the covers this is due to C++ DR1288 (i.e. see bug #50025 of
which this is possibly either a duplicate or just goes away if that is fixed,
but will let someone else make that call), but for otherwise-warning-free code
it's quite obnoxious, as there does not appear to be anything wrong with the
code.
Goes away if ()'s are used instead of {}'s for the initialization.
(Full SSCCE is attached.)
