http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56958
Bug #: 56958
Summary: Spurious unused variable warning in empty pack
expansion
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: lucdan...@free.fr
Created attachment 29872
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29872
Minimal testcase
Using:
g++-snapshot (Debian 20130330-1) 4.9.0 20130330 (experimental) [trunk revision
197260]
$ cat main.cpp
template<typename... T>
int foo(T... t)
{
int spurious = 0;
return false ? foo(t + spurious...) : 0;
}
int main()
{
return foo();
}
$ g++-snapshot -Wall -std=c++11 main.cpp
main.cpp: In instantiation of 'int foo(T ...) [with T = {}]':
main.cpp:10:16: required from here
main.cpp:4:9: warning: variable 'spurious' set but not used
[-Wunused-but-set-variable]
int spurious = 0;
^
No such warning is produced when passing arguments to foo.
