[Bug c++/44682] New: warning: variable ‘x’ set but not used

[Bug c++/44682] New: warning: variable ‘x’ set but not used

[wouter dot vermaelen at scarlet dot be]

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> cat bug.ii
struct Base1 {
    virtual ~Base1() {}
};
struct Base2 {
    virtual ~Base2() {}
};
struct Foo : Base1, Base2 {};

void f(Foo&);

void g(void* v) {
    Base2* base = static_cast<Base2*>(v);
    Foo* foo = static_cast<Foo*>(base);
    f(*foo);
}


> g++ -Wall -c bug.ii
bug.ii: In function ‘void g(void*)’:
bug.ii:12:9: warning: variable ‘base’ set but not used
[-Wunused-but-set-variable]


I'm using SVN revision trunk@161411 on linux x86_64.


-- 
           Summary: warning: variable ‘x’ set but not used
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: wouter dot vermaelen at scarlet dot be


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44682

[Bug c++/44682] [4.6 Regression] warning: variable ‘x’ set but not used

[pinskia at gcc dot gnu dot org]

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------- Comment #1 from pinskia at gcc dot gnu dot org  2010-06-28 00:31 -------
Confirmed.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu dot org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|                            |diagnostic
   Last reconfirmed|0000-00-00 00:00:00         |2010-06-28 00:31:55
               date|                            |
            Summary|warning: variable ‘x’ set   |[4.6 Regression] warning:
                   |but not used                |variable ‘x’ set but not
                   |                            |used
   Target Milestone|---                         |4.6.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44682

[Bug c++/44682] [4.6 Regression] warning: variable ‘x’ set but not used

[jakub at gcc dot gnu dot org]

------- Comment #2 from jakub at gcc dot gnu dot org  2010-06-28 08:54 -------
Created an attachment (id=21021)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21021&action=view)
gcc46-pr44682.patch

Untested fix.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44682

[Bug c++/44682] [4.6 Regression] warning: variable ‘x’ set but not used

[jakub at gcc dot gnu dot org]

------- Comment #3 from jakub at gcc dot gnu dot org  2010-06-28 20:13 -------
Subject: Bug 44682

Author: jakub
Date: Mon Jun 28 20:12:31 2010
New Revision: 161511

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=161511
Log:
        PR c++/44682
        * class.c (build_base_path): If want_pointer, call mark_rvalue_use
        on expr.

        * g++.dg/warn/Wunused-var-14.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/warn/Wunused-var-14.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/class.c
    trunk/gcc/testsuite/ChangeLog


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44682

[Bug c++/44682] [4.6 Regression] warning: variable ‘x’ set but not used

[jakub at gcc dot gnu dot org]

------- Comment #4 from jakub at gcc dot gnu dot org  2010-06-29 15:24 -------
Fixed.


-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44682