Linux build: Use sysroot when calculating dependencies

third_party/dpkg-dev/scripts/Dpkg/BuildFlags.pm

+# Copyright © 2010-2011 Raphaël Hertzog <hertzog@debian.org>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package Dpkg::BuildFlags;
+
+use strict;
+use warnings;
+
+our $VERSION = '1.03';
+
+use Dpkg ();
+use Dpkg::Gettext;
+use Dpkg::BuildEnv;
+use Dpkg::BuildOptions;
+use Dpkg::ErrorHandling;
+use Dpkg::Vendor qw(run_vendor_hook);
+
+=encoding utf8
+
+=head1 NAME
+
+Dpkg::BuildFlags - query build flags
+
+=head1 DESCRIPTION
+
+The Dpkg::BuildFlags object is used by dpkg-buildflags and can be used
+to query the same information.
+
+=head1 FUNCTIONS
+
+=over 4
+
+=item my $bf = Dpkg::BuildFlags->new()
+
+Create a new Dpkg::BuildFlags object. It will be initialized based
+on the value of several configuration files and environment variables.
+
+=cut
+
+sub new {
+    my ($this, %opts) = @_;
+    my $class = ref($this) || $this;
+
+    my $self = {
+    };
+    bless $self, $class;
+    $self->load_vendor_defaults();
+    return $self;
+}
+
+=item $bf->load_vendor_defaults()
+
+Reset the flags stored to the default set provided by the vendor.
+
+=cut
+
+sub load_vendor_defaults {
+    my ($self) = @_;
+    $self->{options} = {};
+    $self->{source} = {};
+    $self->{features} = {};
+    my $build_opts = Dpkg::BuildOptions->new();
+    $self->{build_options} = $build_opts;
+    my $default_flags = $build_opts->has('noopt') ? '-g -O0' : '-g -O2';
+    $self->{flags} = {
+        CPPFLAGS => '',
+        CFLAGS   => $default_flags,
+        CXXFLAGS => $default_flags,
+        GCJFLAGS => $default_flags,
+        FFLAGS   => $default_flags,
+        LDFLAGS  => '',
+    };
+    $self->{origin} = {
+        CPPFLAGS => 'vendor',
+        CFLAGS   => 'vendor',
+        CXXFLAGS => 'vendor',
+        GCJFLAGS => 'vendor',
+        FFLAGS   => 'vendor',
+        LDFLAGS  => 'vendor',
+    };
+    $self->{maintainer} = {
+        CPPFLAGS => 0,
+        CFLAGS   => 0,
+        CXXFLAGS => 0,
+        GCJFLAGS => 0,
+        FFLAGS   => 0,
+        LDFLAGS  => 0,
+    };
+    # The Debian vendor hook will add hardening build flags
+    run_vendor_hook('update-buildflags', $self);
+}
+
+=item $bf->load_system_config()
+
+Update flags from the system configuration.
+
+=cut
+
+sub load_system_config {
+    my ($self) = @_;
+    $self->update_from_conffile("$Dpkg::CONFDIR/buildflags.conf", 'system');
+}
+
+=item $bf->load_user_config()
+
+Update flags from the user configuration.
+
+=cut
+
+sub load_user_config {
+    my ($self) = @_;
+    my $confdir = $ENV{XDG_CONFIG_HOME};
+    $confdir ||= $ENV{HOME} . '/.config' if defined $ENV{HOME};
+    if (defined $confdir) {
+        $self->update_from_conffile("$confdir/dpkg/buildflags.conf", 'user');
+    }
+}
+
+=item $bf->load_environment_config()
+
+Update flags based on user directives stored in the environment. See
+dpkg-buildflags(1) for details.
+
+=cut
+
+sub load_environment_config {
+    my ($self) = @_;
+    foreach my $flag (keys %{$self->{flags}}) {
+        my $envvar = 'DEB_' . $flag . '_SET';
+        if (Dpkg::BuildEnv::has($envvar)) {
+            $self->set($flag, Dpkg::BuildEnv::get($envvar), 'env');
+        }
+        $envvar = 'DEB_' . $flag . '_STRIP';
+        if (Dpkg::BuildEnv::has($envvar)) {
+            $self->strip($flag, Dpkg::BuildEnv::get($envvar), 'env');
+        }
+        $envvar = 'DEB_' . $flag . '_APPEND';
+        if (Dpkg::BuildEnv::has($envvar)) {
+            $self->append($flag, Dpkg::BuildEnv::get($envvar), 'env');
+        }
+        $envvar = 'DEB_' . $flag . '_PREPEND';
+        if (Dpkg::BuildEnv::has($envvar)) {
+            $self->prepend($flag, Dpkg::BuildEnv::get($envvar), 'env');
+        }
+    }
+}
+
+=item $bf->load_maintainer_config()
+
+Update flags based on maintainer directives stored in the environment. See
+dpkg-buildflags(1) for details.
+
+=cut
+
+sub load_maintainer_config {
+    my ($self) = @_;
+    foreach my $flag (keys %{$self->{flags}}) {
+        my $envvar = 'DEB_' . $flag . '_MAINT_SET';
+        if (Dpkg::BuildEnv::has($envvar)) {
+            $self->set($flag, Dpkg::BuildEnv::get($envvar), undef, 1);
+        }
+        $envvar = 'DEB_' . $flag . '_MAINT_STRIP';
+        if (Dpkg::BuildEnv::has($envvar)) {
+            $self->strip($flag, Dpkg::BuildEnv::get($envvar), undef, 1);
+        }
+        $envvar = 'DEB_' . $flag . '_MAINT_APPEND';
+        if (Dpkg::BuildEnv::has($envvar)) {
+            $self->append($flag, Dpkg::BuildEnv::get($envvar), undef, 1);
+        }
+        $envvar = 'DEB_' . $flag . '_MAINT_PREPEND';
+        if (Dpkg::BuildEnv::has($envvar)) {
+            $self->prepend($flag, Dpkg::BuildEnv::get($envvar), undef, 1);
+        }
+    }
+}
+
+
+=item $bf->load_config()
+
+Call successively load_system_config(), load_user_config(),
+load_environment_config() and load_maintainer_config() to update the
+default build flags defined by the vendor.
+
+=cut
+
+sub load_config {
+    my ($self) = @_;
+    $self->load_system_config();
+    $self->load_user_config();
+    $self->load_environment_config();
+    $self->load_maintainer_config();
+}
+
+=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 $maint is
+defined and true.
+
+=cut
+
+sub set {
+    my ($self, $flag, $value, $src, $maint) = @_;
+    $self->{flags}->{$flag} = $value;
+    $self->{origin}->{$flag} = $src if defined $src;
+    $self->{maintainer}->{$flag} = $maint if $maint;
+}
+
+=item $bf->set_feature($area, $feature, $enabled)
+
+Update the boolean state of whether a specific feature within a known
+feature area has been enabled. The only currently known feature area is
+"hardening".
+
+=cut
+
+sub set_feature {
+    my ($self, $area, $feature, $enabled) = @_;
+    $self->{features}{$area}{$feature} = $enabled;
+}
+
+=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 $maint is defined and true.
+
+=cut
+
+sub strip {
+    my ($self, $flag, $value, $src, $maint) = @_;
+    foreach my $tostrip (split(/\s+/, $value)) {
+        next unless length $tostrip;
+        $self->{flags}->{$flag} =~ s/(^|\s+)\Q$tostrip\E(\s+|$)/ /g;
+    }
+    $self->{flags}->{$flag} =~ s/^\s+//g;
+    $self->{flags}->{$flag} =~ s/\s+$//g;
+    $self->{origin}->{$flag} = $src if defined $src;
+    $self->{maintainer}->{$flag} = $maint if $maint;
+}
+
+=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 $maint is defined and true.
+
+=cut
+
+sub append {
+    my ($self, $flag, $value, $src, $maint) = @_;
+    if (length($self->{flags}->{$flag})) {
+        $self->{flags}->{$flag} .= " $value";
+    } else {
+        $self->{flags}->{$flag} = $value;
+    }
+    $self->{origin}->{$flag} = $src if defined $src;
+    $self->{maintainer}->{$flag} = $maint if $maint;
+}
+
+=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 $maint is defined and true.
+
+=cut
+
+sub prepend {
+    my ($self, $flag, $value, $src, $maint) = @_;
+    if (length($self->{flags}->{$flag})) {
+        $self->{flags}->{$flag} = "$value " . $self->{flags}->{$flag};
+    } else {
+        $self->{flags}->{$flag} = $value;
+    }
+    $self->{origin}->{$flag} = $src if defined $src;
+    $self->{maintainer}->{$flag} = $maint if $maint;
+}
+
+
+=item $bf->update_from_conffile($file, $source)
+
+Update the current build flags based on the configuration directives
+contained in $file. See dpkg-buildflags(1) for the format of the directives.
+
+$source is the origin recorded for any build flag set or modified.
+
+=cut
+
+sub update_from_conffile {
+    my ($self, $file, $src) = @_;
+    return unless -e $file;
+    open(my $conf_fh, '<', $file) or syserr(_g('cannot read %s'), $file);
+    while (<$conf_fh>) {
+        chomp;
+        next if /^\s*#/; # Skip comments
+        next if /^\s*$/; # Skip empty lines
+        if (/^(append|prepend|set|strip)\s+(\S+)\s+(\S.*\S)\s*$/i) {
+            my ($op, $flag, $value) = ($1, $2, $3);
+            unless (exists $self->{flags}->{$flag}) {
+                warning(_g('line %d of %s mentions unknown flag %s'), $., $file, $flag);
+                $self->{flags}->{$flag} = '';
+            }
+            if (lc($op) eq 'set') {
+                $self->set($flag, $value, $src);
+            } elsif (lc($op) eq 'strip') {
+                $self->strip($flag, $value, $src);
+            } elsif (lc($op) eq 'append') {
+                $self->append($flag, $value, $src);
+            } elsif (lc($op) eq 'prepend') {
+                $self->prepend($flag, $value, $src);
+            }
+        } else {
+            warning(_g('line %d of %s is invalid, it has been ignored'), $., $file);
+        }
+    }
+    close($conf_fh);
+}
+
+=item $bf->get($flag)
+
+Return the value associated to the flag. It might be undef if the
+flag doesn't exist.
+
+=cut
+
+sub get {
+    my ($self, $key) = @_;
+    return $self->{flags}{$key};
+}
+
+=item $bf->get_feature_areas()
+
+Return the feature areas (i.e. the area values has_features will return
+true for).
+
+=cut
+
+sub get_feature_areas {
+    my ($self) = @_;
+    return keys %{$self->{features}};
+}
+
+=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
+
+sub get_features {
+    my ($self, $area) = @_;
+    return %{$self->{features}{$area}};
+}
+
+=item $bf->get_origin($flag)
+
+Return the origin associated to the flag. It might be undef if the
+flag doesn't exist.
+
+=cut
+
+sub get_origin {
+    my ($self, $key) = @_;
+    return $self->{origin}{$key};
+}
+
+=item $bf->is_maintainer_modified($flag)
+
+Return true if the flag is modified by the maintainer.
+
+=cut
+
+sub is_maintainer_modified {
+    my ($self, $key) = @_;
+    return $self->{maintainer}{$key};
+}
+
+=item $bf->has_features($area)
+
+Returns true if the given area of features is known, and false otherwise.
+The only currently recognized area is "hardening".
+
+=cut
+
+sub has_features {
+    my ($self, $area) = @_;
+    return exists $self->{features}{$area};
+}
+
+=item $bf->has($option)
+
+Returns a boolean indicating whether the flags exists in the object.
+
+=cut
+
+sub has {
+    my ($self, $key) = @_;
+    return exists $self->{flags}{$key};
+}
+
+=item my @flags = $bf->list()
+
+Returns the list of flags stored in the object.
+
+=cut
+
+sub list {
+    my ($self) = @_;
+    my @list = sort keys %{$self->{flags}};
+    return @list;
+}
+
+=back
+
+=head1 CHANGES
+
+=head2 Version 1.01
+
+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 1.02
+
+New methods: $bf->get_features(), $bf->has_features(), $bf->set_feature().
+
+=head2 Version 1.03
+
+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().
+
+=head1 AUTHOR
+
+Raphaël Hertzog <hertzog@debian.org>
+
+=cut
+
+1;