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From: "l.lunak at suse dot cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/55203] New: No unused warning for variables of non-trivial types
Date: Sun, 04 Nov 2012 10:48:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D55203

             Bug #: 55203
           Summary: No unused warning for variables of non-trivial types
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: l.lunak@suse.cz


GCC warns about unused variables e.g. of type 'int', but not 'std::string' :

$ cat a.cpp
#include <string>

void foo()
    {
    int i;
    std::string s;
    }
$ g++ -Wall -Wunused -c a.cpp
a.cpp: In function =E2=80=98void foo()=E2=80=99:
a.cpp:5:9: warning: unused variable =E2=80=98i=E2=80=99 [-Wunused-variable]
     int i;
         ^

In the function 's' is apparently unused too, but the compiler cannot tell =
it.