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From: "jwillemsen at remedy dot nl" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/55340] New: Invalid maybe unitialized warning Date: Thu, 15 Nov 2012 12:51:00 -0000 [thread overview] Message-ID: <bug-55340-4@http.gcc.gnu.org/bugzilla/> (raw) http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55340 Bug #: 55340 Summary: Invalid maybe unitialized warning Classification: Unclassified Product: gcc Version: 4.7.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned@gcc.gnu.org ReportedBy: jwillemsen@remedy.nl Created attachment 28698 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28698 gzip with both preprocessed files We have in some of our tests a warning that a variable may be used unitialized, but we have validated that this is not the case (as far as we could tell). We tried to reduce our code to a minimum, but the strange thing is that when we remove some not related code, the warning is gone. Attached 2 preprocessed files, t.cpp t2.cpp, compile using: g++ --std=c++0x -fno-strict-aliasing -fvisibility=hidden -fvisibility-inlines-hidden -O3 -ggdb -m64 -pthread -Wall -W -Wpointer-arith -pipe -D_GNU_SOURCE -c t.cpp When compiling t.cpp we get: In file included from testC.cpp:26:0: testC.h: In member function ‘void Test::union_union::swap(Test::union_union&)’: testC.h:764:3: warning: ‘*((void*)(& intermediate)+8).Test::unionType::disc_’ may be used uninitialized in this function [-Wmaybe-uninitialized] testC.h:1325:27: note: ‘*((void*)(& intermediate)+8).Test::unionType::disc_’ was declared here When compiling t2.cpp there is no warning. If you check the diff between t.cpp and t2.cpp you will see that the code that triggers the warning is still there. We have reduced the code to the point that removal of any type would not trigger the warning.
next reply other threads:[~2012-11-15 12:51 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-11-15 12:51 jwillemsen at remedy dot nl [this message] 2012-11-15 14:17 ` [Bug c++/55340] " jwillemsen at remedy dot nl 2013-02-27 16:04 ` paolo.carlini at oracle dot com 2013-02-27 19:20 ` jwillemsen at remedy dot nl
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