Package: libstdc++6 Version: 5.2.1-20 Severity: normal Control: tags jessie sid
********** On Linux, the distros often use libstdc++ (GNU) rather than libc++ (LLVM) for Clang. Building libcxx is an art that I have never been able to untangle, and I think the maintainers have discovered the same (libc++ was not installed with Clang). Below, I'm catching a UB finding when using Clang and libstdc++ (GNU). This one has been around for some time. I first encountered it on Apple platforms. I regularly encounter it on Debian and Ubuntu. The fix is fairly easy, and I usually just do it: a couple of casts among unsigned and the flags. Also see http://lists.llvm.org/pipermail/cfe-dev/2015-January/040753.html. ********** $ cat ub.cxx #include <iostream> int main(int argc, char* argv[]) { std::cout << std::hex << argc << std::endl; std::cout << std::dec << argc << std::endl; return 0; } $ clang++ -fsanitize=undefined ub.cxx -o ub.exe $ ./ub.exe /usr/bin/../lib/gcc/x86_64-linux-gnu/5.2.1/../../../../include/c++/5.2.1/bits/ios_base.h:102:24: runtime error: load of value 4294967221, which is not a valid value for type 'std::_Ios_Fmtflags' /usr/bin/../lib/gcc/x86_64-linux-gnu/5.2.1/../../../../include/c++/5.2.1/bits/ios_base.h:82:67: runtime error: load of value 4294967221, which is not a valid value for type 'std::_Ios_Fmtflags' 1 1 ********** $ g++ --version g++ (Debian 5.2.1-20) 5.2.1 20151002 Copyright (C) 2015 Free Software Foundation, Inc. $ uname -a Linux debian-8-x64 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt11-1+deb8u5 (2015-10-09) x86_64 GNU/Linux $ lsb_release No LSB modules are available. ********** $ apt-cache show libstdc++ Package: libstdc++6 Status: install ok installed Priority: important Section: libs Installed-Size: 1959 Maintainer: Debian GCC Maintainers <debian-gcc@lists.debian.org> Architecture: amd64 Multi-Arch: same Source: gcc-5 Version: 5.2.1-20 Replaces: libstdc++6-5-dbg (<< 4.9.0-3) Depends: gcc-5-base (= 5.2.1-20), libc6 (>= 2.18), libgcc1 (>= 1:4.1.1) Breaks: blockattack (<= 1.4.1+ds1-2.1+b2), boo (<= 0.9.5~git20110729.r1.202a430-2), c++-annotations (<= 10.2.0-1), clustalx (<= 2.1+lgpl-3), dff (<= 1.3.0+dfsg.1-4.1+b3), digikam-private-libs (<= 4:4.4.0-1.1+b2), emscripten (<= 1.22.1-1), ergo (<= 3.4.0-1), fceux (<= 2.2.2+dfsg0-1), fiona (<= 1.5.1-2), flush (<= 0.9.12-3.1), freeorion (<= 0.4.4+git20150327-2), fslview (<= 4.0.1-4), fwbuilder (<= 5.1.0-4), gcc-4.3 (<< 4.3.6-1), gcc-4.4 (<< 4.4.6-4), gcc-4.5 (<< 4.5.3-2), gnote (<= 3.16.2-1), gnudatalanguage (<= 0.9.5-2+b2), innoextract (<= 1.4-1+b1), libantlr-dev (<= 2.7.7+dfsg-6), libapache2-mod-passenger (<= 5.0.7-1), libaqsis1 (<= 1.8.2-1), libassimp3 (<= 3.0~dfsg-4), libboost-date-time1.54.0, libboost-date-time1.55.0, libchemps2-1 (<= 1.5-1), libcpprest2.4 (<= 2.4.0-2), libdap17 (<= 3.14.0-2), libdapclient6 (<= 3.14.0-2), libdapserver7 (<= 3.14.0-2), libdavix0 (<= 0.4.0-1+b1), libdballe6 (<= 6.8-1), libdiet-admin2.8 (<= 2.8.0-1+b3), libdiet-client2.8 (<= 2.8.0-1+b3), libdiet-sed2.8 (<= 2.8.0-1+b3), libfreefem++ (<= 3.37.1-1), libgazebo5 (<= 5.0.1+dfsg-2.1), libgetfem4++ (<= 4.2.1~beta1~svn4635~dfsg-3+b1), libgmsh2 (<= 2.9.3+dfsg1-1), libinsighttoolkit4.7 (<= 4.7.2-2), libkolabxml1 (<= 1.1.0-3), libmarisa0 (<= 0.2.4-8), libogre-1.8.0 (<= 1.8.0+dfsg1-7+b1), libogre-1.9.0 (<= 1.9.0+dfsg1-4), libopenwalnut1 (<= 1.4.0~rc1+hg3a3147463ee2-1+b1), libpqxx-4.0 (<= 4.0.1+dfsg-3), libreoffice-core (<= 1:4.4.5-2), librime1 (<= 1.2+dfsg-2), libwibble-dev (<= 1.1-1), libwreport2 (<= 2.14-1), libxmltooling6 (<= 1.5.3-2.1), lightspark (<= 0.7.2+git20150512-2+b1), mira-assembler (<= 4.9.5-1), mongodb (<= 1:2.4.14-2), mongodb-server (<= 1:2.4.14-2), ncbi-blast+ (<= 2.2.30-4), openscad (<= 2014.03+dfsg-1+b1), passepartout (<= 0.7.1-1.1), pdf2djvu (<= 0.7.21-2), photoprint (<= 0.4.2~pre2-2.3+b2), plastimatch (<= 1.6.2+dfsg-1), plee-the-bear (<= 0.6.0-3.1), povray (<= 1:3.7.0.0-8), powertop (<= 2.6.1-1), printer-driver-brlaser (<= 3-3), psi4 (<= 4.0~beta5+dfsg-2+b1), python-fiona (<= 1.5.1-2), python-guiqwt (<= 2.3.1-1), python-healpy (<= 1.8.1-1+b1), python-htseq (<= 0.5.4p3-2), python-imposm (<= 2.5.0-3+b2), python-pysph (<= 0~20150606.gitfa26de9-5), python-rasterio (<= 0.24.0-1), python-scipy (<= 0.14.1-1), python-sfml (<= 2.2~git20150611.196c88+dfsg-1+b1), python3-fiona (<= 1.5.1-2), python3-scipy (<= 0.14.1-1), python3-sfml (<= 2.2~git20150611.196c88+dfsg-1+b1), python3-taglib (<= 0.3.6+dfsg-2+b2), realtimebattle (<= 1.0.8-14), ruby-passenger (<= 5.0.7-1), schroot (<= 1.6.10-1+b1), sqlitebrowser (<= 3.5.1-3), tecnoballz (<= 0.93.1-6), wesnoth-1.12-core (<= 1:1.12.4-1), widelands (<= 1:18-3+b1), xflr5 (<= 6.09.06-2) Conflicts: scim (<< 1.4.2-1) Description-en: GNU Standard C++ Library v3 This package contains an additional runtime library for C++ programs built with the GNU compiler. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0. Description-md5: 724ab84919e0e220afb960e36463914d Homepage: http://gcc.gnu.org/ ********** $ apt-cache show g++ Package: g++ Status: install ok installed Priority: optional Section: devel Installed-Size: 17 Maintainer: Debian GCC Maintainers <debian-gcc@lists.debian.org> Architecture: amd64 Source: gcc-defaults (1.145) Version: 4:5.2.1-4 Provides: c++-compiler Depends: cpp (>= 4:5.2.1-4), gcc (>= 4:5.2.1-4), g++-5 (>= 5.2.1-13~), gcc-5 (>= 5.2.1-13~) Suggests: g++-multilib Description-en: GNU C++ compiler This is the GNU C++ compiler, a fairly portable optimizing compiler for C++. . This is a dependency package providing the default GNU C++ compiler. Description-md5: 4d44b18774ae5123b7c3f70d940cf655 Package: g++ Source: gcc-defaults (1.136) Version: 4:4.9.2-2 Installed-Size: 34 Maintainer: Debian GCC Maintainers <debian-gcc@lists.debian.org> Architecture: amd64 Provides: c++-compiler Depends: cpp (>= 4:4.9.2-2), gcc (>= 4:4.9.2-2), g++-4.9 (>= 4.6.4-1~), gcc-4.9 (>= 4.6.4-1~) Suggests: g++-multilib Description-en: GNU C++ compiler This is the GNU C++ compiler, a fairly portable optimizing compiler for C++. . This is a dependency package providing the default GNU C++ compiler. Description-md5: 4d44b18774ae5123b7c3f70d940cf655 Build-Essential: yes Tag: devel::compiler, devel::lang:c++, implemented-in::c, interface::commandline, role::dummy, role::metapackage, suite::gnu, works-with::software:source Section: devel Priority: optional Filename: pool/main/g/gcc-defaults/g++_4.9.2-2_amd64.deb Size: 1530 MD5sum: cd4aa68ba8cf582df806c324988e6a00 SHA1: 82a50c84e1105e1f0c767da82c09f2398ac2d4b2 SHA256: 6fb9842c6a0ad0cd5445b9f2f2cb3f738abcc83a6b8e0900aad441574f5cecee
