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* [Bug c++/31841] New: warning: 'this.0' is used uninitialized in this function @ 2007-05-05 16:28 sylvain dot pion at sophia dot inria dot fr 2007-05-05 18:19 ` [Bug c++/31841] " rguenth at gcc dot gnu dot org ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: sylvain dot pion at sophia dot inria dot fr @ 2007-05-05 16:28 UTC (permalink / raw) To: gcc-bugs Compiling the code below with -O2 -Wall produces the buggy warning mentionned in the subject. g++ 4.1 and 4.3 do not have this problem. The code below is pretty minimal (extracted from CGAL). For example, removing the derivation from the Empty_class removes the buggy warning. ---------------- struct Empty_class {}; struct C : Empty_class {}; struct M { static C f() { return C(); } }; struct R { C c; R() : c(M::f()) {} }; int main() { R r; return 0; } -------------------- -- Summary: warning: 'this.0' is used uninitialized in this function Product: gcc Version: 4.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: sylvain dot pion at sophia dot inria dot fr GCC host triplet: i686-pc-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31841 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/31841] warning: 'this.0' is used uninitialized in this function 2007-05-05 16:28 [Bug c++/31841] New: warning: 'this.0' is used uninitialized in this function sylvain dot pion at sophia dot inria dot fr @ 2007-05-05 18:19 ` rguenth at gcc dot gnu dot org 2009-02-09 16:06 ` [Bug middle-end/31841] [4.2 regression] bogus is used uninitialized (warning in dead code) manu at gcc dot gnu dot org 2009-03-30 21:47 ` jsm28 at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: rguenth at gcc dot gnu dot org @ 2007-05-05 18:19 UTC (permalink / raw) To: gcc-bugs ------- Comment #1 from rguenth at gcc dot gnu dot org 2007-05-05 19:19 ------- int main() () { struct Empty_class * this.0; struct Empty_class * const this; struct C * D.2077; struct R r; int D.2064; <bb 2>: D.2077_1 = &r.c; this.0_3 = this.0_2; this.0_4 = (struct Empty_class *) D.2077_1; D.2064_5 = 0; return D.2064_5; } somehow inlining ends up with the unused copies. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31841 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/31841] [4.2 regression] bogus is used uninitialized (warning in dead code) 2007-05-05 16:28 [Bug c++/31841] New: warning: 'this.0' is used uninitialized in this function sylvain dot pion at sophia dot inria dot fr 2007-05-05 18:19 ` [Bug c++/31841] " rguenth at gcc dot gnu dot org @ 2009-02-09 16:06 ` manu at gcc dot gnu dot org 2009-03-30 21:47 ` jsm28 at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: manu at gcc dot gnu dot org @ 2009-02-09 16:06 UTC (permalink / raw) To: gcc-bugs ------- Comment #2 from manu at gcc dot gnu dot org 2009-02-09 16:06 ------- This works in GCC 4.1, 4.3 and 4.4, so this is either a regression (that probably will not be fixed before 4.2 is closed) or it is not a regression and should be closed as FIXED already in trunk. -- manu at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |manu at gcc dot gnu dot org Status|UNCONFIRMED |NEW Ever Confirmed|0 |1 Last reconfirmed|0000-00-00 00:00:00 |2009-02-09 16:06:14 date| | Summary|warning: 'this.0' is used |[4.2 regression] bogus is |uninitialized in this |used uninitialized (warning |function (warning in dead |in dead code) |code) | Target Milestone|--- |4.2.6 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31841 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/31841] [4.2 regression] bogus is used uninitialized (warning in dead code) 2007-05-05 16:28 [Bug c++/31841] New: warning: 'this.0' is used uninitialized in this function sylvain dot pion at sophia dot inria dot fr 2007-05-05 18:19 ` [Bug c++/31841] " rguenth at gcc dot gnu dot org 2009-02-09 16:06 ` [Bug middle-end/31841] [4.2 regression] bogus is used uninitialized (warning in dead code) manu at gcc dot gnu dot org @ 2009-03-30 21:47 ` jsm28 at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: jsm28 at gcc dot gnu dot org @ 2009-03-30 21:47 UTC (permalink / raw) To: gcc-bugs ------- Comment #3 from jsm28 at gcc dot gnu dot org 2009-03-30 21:46 ------- Closing 4.2 branch, fixed in 4.3. -- jsm28 at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Known to fail|4.2.3 |4.2.3 4.2.5 Resolution| |FIXED Target Milestone|4.2.6 |4.3.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31841 ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2009-03-30 21:47 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2007-05-05 16:28 [Bug c++/31841] New: warning: 'this.0' is used uninitialized in this function sylvain dot pion at sophia dot inria dot fr 2007-05-05 18:19 ` [Bug c++/31841] " rguenth at gcc dot gnu dot org 2009-02-09 16:06 ` [Bug middle-end/31841] [4.2 regression] bogus is used uninitialized (warning in dead code) manu at gcc dot gnu dot org 2009-03-30 21:47 ` jsm28 at gcc dot gnu dot org
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