http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57078
Bug #: 57078
Summary: Unhelpful -Wunused-variable warning
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: ppluzhni...@google.com
Test:
namespace Foo {
extern const char Name[]; // line 2
}
int main()
{
using Foo::Name; // trigger, line 7
return 0;
}
Using g++ (GCC) 4.9.0 20130412 (experimental):
g++ -c t.cc -Wall
t.cc: In function ‘int main()’:
t.cc:2:21: warning: unused variable ‘Foo::Name’ [-Wunused-variable]
extern const char Name[];
^
This is quite poor: line 2 that is reported is in some header file, and there
is *nothing* wrong there.
Line 7 may be in a different header file, or in a .cc file, and it is line 7
that triggers the warning; but it is not mentioned in the warning itself.
