This program compiles: #include <iostream>
int main() { std::cout << _S << std::endl; return 0; } If started, it outputs : 8 output of my g++ -v: Reading specs from /opt/csw/gcc4/lib/gcc/i386-pc-solaris2.8/4.0.2/specs Target: i386-pc-solaris2.8 Configured with: ../sources/gcc-4.0.2/configure --prefix=/opt/csw/gcc4 --with-local-prefix=/opt/csw --with-gnu-as --with-as=/opt/csw/bin/gas --without-gnu-ld --with-ld=/usr/ccs/bin/ld --enable-threads=posix --enable-shared --enable-multilib --enable-nls --with-included-gettext --with-libiconv-prefix=/opt/csw --with-x --enable-java-awt=xlib --with-system-zlib --enable-languages=c,c++,f95,java,objc,ada Thread model: posix gcc version 4.0.2 -- Summary: A variable named _S exists without declaration Product: gcc Version: 4.0.2 Status: UNCONFIRMED Severity: minor Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: boris dot breidenbach at physik dot uni-erlangen dot de GCC build triplet: i386-pc-solaris2.8 GCC host triplet: i386-pc-solaris2.8 GCC target triplet: i386-pc-solaris2.8 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29940