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hardened-ld(1) [debian man page]

HARDENED-LD(1)							 Debian GNU/Linux						    HARDENED-LD(1)

hardened-ld - linker wrapper to enforce hardening toolchain improvements SYNOPSIS
The hardened-ld wrapper is normally used by calling ld as usual with DEB_BUILD_HARDENING 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_RELRO=0 Don't mark ELF sections read-only after start. See README.Debian for details. DEB_BUILD_HARDENING_BINDNOW=0 Don't mark ELF loader for start-up dynamic resolution. See README.Debian for details. NOTES
System-wide settings can be added to /etc/hardening-wrapper.conf, one per line. The real ld is renamed ld.real, and a diversion is registered with dpkg-divert(1). Thus hardened-ld's idea of the default ld is dictated by whatever package installed /usr/bin/ld. SEE ALSO
hardened-cc(1) ld(1) Debian Project 2008-01-08 HARDENED-LD(1)

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dpkg-buildflags(1)						    dpkg suite							dpkg-buildflags(1)

dpkg-buildflags - returns build flags to use during package build SYNOPSIS
dpkg-buildflags [option...] command DESCRIPTION
dpkg-buildflags is a tool to retrieve compilation flags to use during build of Debian packages. The default flags are defined by the ven- dor but they can be extended/overriden in several ways: 1. system-wide with /etc/dpkg/buildflags.conf; 2. for the current user with $XDG_CONFIG_HOME/dpkg/buildflags.conf where $XDG_CONFIG_HOME defaults to $HOME/.config; 3. temporarily with environment variables (see section ENVIRONMENT). The configuration files can contain two types of directives: SET flag value Override the flag named flag to have the value value. APPEND flag value Extend the flag named flag with the options given in value. A space is prepended to the appended value if the flag's current value is non-empty. The configuration files can contain comments on lines starting with a hash (#). Empty lines are also ignored. COMMANDS
--list Print the list of flags supported by the current vendor (one per line). See the SUPPORTED FLAGS section for more information about them. --export=format Print to standard output shell (if format is sh) or make (if format is make) commands that can be used to export all the compilation flags in the environment. If the format value is not given, sh is assumed. Only compilation flags starting with an upper case char- acter are included, others are assumed to not be suitable for the environment. --get flag Print the value of the flag on standard output. Exits with 0 if the flag is known otherwise exits with 1. --origin flag Print the origin of the value that is returned by --get. Exits with 0 if the flag is known otherwise exits with 1. The origin can be one of the following values: vendor the original flag set by the vendor is returned; system the flag is set/modified by a system-wide configuration; user the flag is set/modified by a user-specific configuration; env the flag is set/modified by an environment-specific configuration. --help Show the usage message and exit. --version Show the version and exit. SUPPORTED FLAGS
CFLAGS Options for the C compiler. The default value set by the vendor includes -g and the default optimization level (-O2 usually, or -O0 if the DEB_BUILD_OPTIONS environment variable defines noopt). CPPFLAGS Options for the C preprocessor. Default value: empty. CXXFLAGS Options for the C++ compiler. Same as CFLAGS. FFLAGS Options for the Fortran compiler. Same as CFLAGS. LDFLAGS Options passed to the compiler when linking executables or shared objects (if the linker is called directly, then -Wl and , have to be stripped from these options). Default value: empty. FILES
/etc/dpkg/buildflags.conf System wide configuration file. $XDG_CONFIG_HOME/dpkg/buildflags.conf or $HOME/.config/dpkg/buildflags.conf User configuration file. ENVIRONMENT
DEB_flag_SET This variable can be used to force the value returned for the given flag. DEB_flag_APPEND This variable can be used to append supplementary options to the value returned for the given flag. DEB_BUILD_OPTIONS When used with the hardening-wrapper package, the values hardening and nohardening will be converted into their respective DEB_BUILD_HARDENING values. The hardening option can also include (optionally prefixed with no ) the following sub-options: stack- protector format fortify pie relro For example, DEB_BUILD_OPTIONS=hardening=nopie would cause DEB_BUILD_HARDENING_PIE=0 to be set, or DEB_BUILD_OPTIONS=nohardening would cause DEB_BUILD_HARDENING=0 to be set. See for further details. AUTHOR
Copyright (C) 2010 Raphael Hertzog This is free software; see the GNU General Public Licence version 2 or later for copying conditions. There is NO WARRANTY. Debian Project 2010-07-29 dpkg-buildflags(1)

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