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=head1 NAME

Dpkg::BuildFlags - query build flags

=head1 DESCRIPTION

This class is used by dpkg-buildflags and can be used
to query the same information.

=cut

=head1 METHODS

=over 4

=item $bf = Dpkg::BuildFlags->new()

Create a new Dpkg::BuildFlags object. It will be initialized based
on the value of several configuration files and environment variables.

If the option B<vendor_defaults> is set to false, then no vendor defaults are
initialized (it defaults to true).

=cut

=item $bf->load_vendor_defaults()

Reset the flags stored to the default set provided by the vendor.

=cut

=item $bf->load_system_config()

Update flags from the system configuration.

=cut

=item $bf->load_user_config()

Update flags from the user configuration.

=cut

=item $bf->load_environment_config()

Update flags based on user directives stored in the environment. See
L<dpkg-buildflags(1)> for details.

=cut

=item $bf->load_maintainer_config()

Update flags based on maintainer directives stored in the environment. See
L<dpkg-buildflags(1)> for details.

=cut

=item $bf->load_config()

Call successively load_system_config(), load_user_config(),
load_environment_config() and load_maintainer_config() to update the
default build flags defined by the vendor.

=cut

=item $bf->unset($flag)

Unset the build flag $flag, so that it will not be known anymore.

=cut

=item $bf->set($flag, $value, $source, $maint)

Update the build flag $flag with value $value and record its origin as
$source (if defined). Record it as maintainer modified if $maint is
defined and true.

=cut

=item $bf->set_feature($area, $feature, $enabled)

Update the boolean state of whether a specific feature within a known
feature area has been enabled. The only currently known feature areas
are "future", "qa", "sanitize", "optimize", "hardening" and "reproducible".

=cut

=item $bf->get_feature($area, $feature)

Returns the value for the given feature within a known feature area.
This is relevant for builtin features where the feature has a ternary
state of true, false and undef, and where the latter cannot be retrieved
with use_feature().

=cut

=item $bf->use_feature($area, $feature)

Returns true if the given feature within a known feature areas has been
enabled, and false otherwise.
The only currently recognized feature areas are "future", "qa", "sanitize",
"optimize", "hardening" and "reproducible".

=cut

=item $bf->set_builtin($area, $feature, $enabled)

Update the boolean state of whether a specific feature within a known
feature area is handled (even if only in some architectures) as a builtin
default by the compiler.

=cut

=item $bf->get_builtins($area)

Return, for the given area, a hash with keys as feature names, and values
as booleans indicating whether the feature is handled as a builtin default
by the compiler or not. Only features that might be handled as builtins on
some architectures are returned as part of the hash. Missing features mean
they are currently never handled as builtins by the compiler.

=cut

=item $bf->set_option_value($option, $value)

B<Private> method to set the value of a build option.
Do not use outside of the dpkg project.

=cut

=item $bf->get_option_value($option)

B<Private> method to get the value of a build option.
Do not use outside of the dpkg project.

=cut

=item $bf->strip($flag, $value, $source, $maint)

Update the build flag $flag by stripping the flags listed in $value and
record its origin as $source (if defined). Record it as maintainer modified
if $maint is defined and true.

=cut

=item $bf->append($flag, $value, $source, $maint)

Append the options listed in $value to the current value of the flag $flag.
Record its origin as $source (if defined). Record it as maintainer modified
if $maint is defined and true.

=cut

=item $bf->prepend($flag, $value, $source, $maint)

Prepend the options listed in $value to the current value of the flag $flag.
Record its origin as $source (if defined). Record it as maintainer modified
if $maint is defined and true.

=cut

=item $bf->update_from_conffile($file, $source)

Update the current build flags based on the configuration directives
contained in $file. See L<dpkg-buildflags(1)> for the format of the directives.

$source is the origin recorded for any build flag set or modified.

=cut

=item $bf->get($flag)

Return the value associated to the flag. It might be undef if the
flag doesn't exist.

=cut

=item $bf->get_feature_areas()

Return the feature areas (i.e. the area values has_features will return
true for).

=cut

=item $bf->get_features($area)

Return, for the given area, a hash with keys as feature names, and values
as booleans indicating whether the feature is enabled or not.

=cut

=item $bf->get_origin($flag)

Return the origin associated to the flag. It might be undef if the
flag doesn't exist.

=cut

=item $bf->is_maintainer_modified($flag)

Return true if the flag is modified by the maintainer.

=cut

=item $bf->has_features($area)

Returns true if the given area of features is known, and false otherwise.
The only currently recognized feature areas are "future", "qa", "sanitize",
"optimize", "hardening" and "reproducible".

=cut

=item $bf->has($option)

Returns a boolean indicating whether the flags exists in the object.

=cut

=item @flags = $bf->list()

Returns the list of flags stored in the object.

=cut

=head1 CHANGES

=head2 Version 1.06 (dpkg 1.21.15)

New method: $bf->get_feature().

=head2 Version 1.05 (dpkg 1.21.14)

New option: 'vendor_defaults' in new().

New methods: $bf->load_vendor_defaults(), $bf->use_feature(),
$bf->set_builtin(), $bf->get_builtins().

=head2 Version 1.04 (dpkg 1.20.0)

New method: $bf->unset().

=head2 Version 1.03 (dpkg 1.16.5)

New method: $bf->get_feature_areas() to list possible values for
$bf->get_features.

New method $bf->is_maintainer_modified() and new optional parameter to
$bf->set(), $bf->append(), $bf->prepend(), $bf->strip().

=head2 Version 1.02 (dpkg 1.16.2)

New methods: $bf->get_features(), $bf->has_features(), $bf->set_feature().

=head2 Version 1.01 (dpkg 1.16.1)

New method: $bf->prepend() very similar to append(). Implement support of
the prepend operation everywhere.

New method: $bf->load_maintainer_config() that update the build flags
based on the package maintainer directives.

=head2 Version 1.00 (dpkg 1.15.7)

Mark the module as public.

=cut