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: unassig...@gcc.gnu.org
ReportedBy: jwillem...@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.
