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Linux 2.6 - man page for dpkg-buildflags (linux section 1)

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

NAME
       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 vendor 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_CON-
	      FIG_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) com-
	      mands 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 character 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  environ-
	      ment 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:
	      stackprotector  format  fortify  pie  relro  For example, DEB_BUILD_OPTIONS=harden-
	      ing=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
	      http://wiki.debian.org/Hardening 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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