[Bug c++/41135] New: Uninitialized variable usage warning broken

[Bug c++/41135] New: Uninitialized variable usage warning broken

[bgamari at gmail dot com]

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Compiling the attached testcase should produce a warning, as it does with g++
4.3.2 (at least with -O or above),

$ g++-4.3 -Wall -Wextra -pedantic -ansi -O3 hi.cpp
/usr/include/bits/stdio2.h: In function ‘int main()’:
/usr/include/bits/stdio2.h:105: warning: ‘hi.array<double, 4>::a[1]’ is used
uninitialized in this function
hi.cpp:29: note: ‘hi.array<double, 4>::a[1]’ was declared here
$ 

On g++ 4.4.2, however, the compiler produces no warning,

$ g++ -Wall -Wextra -pedantic -ansi -O3 hi.cpp
$ 



$ g++ -v
Using built-in specs.
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.4.1-1ubuntu3'
--with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared
--enable-multiarch --enable-linker-build-id --with-system-zlib
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.4 --program-suffix=-4.4 --enable-nls
--enable-clocale=gnu --enable-libstdcxx-debug --enable-mpfr --enable-objc-gc
--disable-werror --with-arch-32=i486 --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.4.1 (Ubuntu 4.4.1-1ubuntu3)


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           Summary: Uninitialized variable usage warning broken
           Product: gcc
           Version: 4.4.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bgamari at gmail dot com
GCC target triplet: x86_64-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41135

[Bug c++/41135] Uninitialized variable usage warning broken

[bgamari at gmail dot com]

------- Comment #1 from bgamari at gmail dot com  2009-08-20 23:26 -------
Created an attachment (id=18408)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18408&action=view)
Warning test case


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41135

[Bug c++/41135] Uninitialized variable usage warning broken

[redi at gcc dot gnu dot org]

------- Comment #2 from redi at gcc dot gnu dot org  2009-08-21 09:56 -------
I get the warning with FSF 4.4.1 and the 4.5.0 20090813 snapshot, looks like a
problem with ubuntu's 4.4.1


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41135

[Bug c++/41135] Uninitialized variable usage warning broken

[bangerth at gmail dot com]

------- Comment #3 from bangerth at gmail dot com  2009-08-25 13:45 -------
Agreed -- I do get the warning from current mainline as well.


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bangerth at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bangerth at gmail dot com
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41135

[Bug c++/41135] Uninitialized variable usage warning broken

[bgamari at gmail dot com]

------- Comment #4 from bgamari at gmail dot com  2009-08-27 19:49 -------
This was reported against the Ubuntu package as Launchpad bug #420129
(https://bugs.launchpad.net/ubuntu/+source/gcc-4.4/+bug/420129)


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41135