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)
--
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
