#include <string> int main() { std::string s = "foo"; s[3]; // doesn't throw and should }
when compiled with g++ -D_GLIBCXX_DEBUG doesn't throw but should. It does throw with s[4] and s[-1], however. test$ g++ -D_GLIBCXX_DEBUG gccbug.cpp && ./a.out test$ g++ -v Using built-in specs. Target: i586-redhat-linux Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --disable-dssi --enable-plugin --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre --enable-libgcj-multifile --enable-java-maintainer-mode --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib --with-ppl --with-cloog --with-tune=generic --with-arch=i586 --build=i586-redhat-linux Thread model: posix gcc version 4.4.1 20090725 (Red Hat 4.4.1-2) (GCC) test $ uname -a Linux maisy.oxyware.net 2.6.30.10-105.fc11.i686.PAE #1 SMP Thu Dec 24 16:41:17 UTC 2009 i686 i686 i386 GNU/Linux Fedora Core 11, 32-bit Intel x86, using distro rpm test$ rpm -q gcc gcc-4.4.1-2.fc11.i586 -- Summary: GLIBCXX_DEBUG off-by-one error for std::string operator[] Product: gcc Version: 4.4.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: gccbug at oxyware dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42673