NAME

       hardened-cc - gcc wrapper to enforce hardening toolchain improvements

SYNOPSIS

       export DEB_BUILD_HARDENING=1

       gcc ...

DESCRIPTION

       The hardened-cc wrapper is normally used by calling gcc as usual when DEB_BUILD_HARDENING is set to 1. It
       will  configure  the  necessary  toolchain hardening features. By default, all features are enabled. If a
       given feature does not work correctly and needs to be disabled, the corresponding  environment  variables
       mentioned below can be set to 0.

ENVIRONMENT

       DEB_BUILD_HARDENING=1
              Enable hardening features.

       DEB_BUILD_HARDENING_DEBUG=1
              Print the full resulting gcc command line to STDERR before calling gcc.

       DEB_BUILD_HARDENING_OUTPUT=/some/path/debug.log
              Instead  of using STDERR for debugging, redirect to the given path. Some builds are very sensitive
              to unexpected STDERR output.

       DEB_BUILD_HARDENING_STACKPROTECTOR=0
              Disable stack overflow protection. See README.Debian for details.

       DEB_BUILD_HARDENING_RELRO=0
              Disable read-only linker sections. See README.Debian for details.

       DEB_BUILD_HARDENING_FORTIFY=0
              Don't fortify several standard functions. See README.Debian for details.

       DEB_BUILD_HARDENING_PIE=0
              Don't build position independent executables. See README.Debian for details.

       DEB_BUILD_HARDENING_FORMAT=0
              Disable unsafe format string usage errors. See README.Debian for details.

NOTES

       System-wide settings can be added to /etc/hardening-wrapper.conf, one per line.

       The real gcc symlinks are renamed gcc.real, and a diversion  is  registered  with  dpkg-divert(1).   Thus
       hardened-cc's idea of the default gcc is dictated by whatever package installed /usr/bin/gcc.

SEE ALSO

       hardened-ld(1) gcc(1)

Debian Project                                     2008-01-08                                     HARDENED-CC(1)