Linux build: Use sysroot when calculating dependencies

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

+# Copyright © 2012 Guillem Jover <guillem@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::BuildEnv;
+
+use strict;
+use warnings;
+
+our $VERSION = '0.01';
+
+my %env_modified = ();
+my %env_accessed = ();
+
+=encoding utf8
+
+=head1 NAME
+
+Dpkg::BuildEnv - track build environment
+
+=head1 DESCRIPTION
+
+The Dpkg::BuildEnv module is used by dpkg-buildflags to track the build
+environment variables being used and modified.
+
+=head1 FUNCTIONS
+
+=over 4
+
+=item $bf->set($varname, $value)
+
+Update the build environment variable $varname with value $value. Record
+it as being accessed and modified.
+
+=cut
+
+sub set {
+    my ($varname, $value) = @_;
+    $env_modified{$varname} = 1;
+    $env_accessed{$varname} = 1;
+    $ENV{$varname} = $value;
+}
+
+=item $bf->get($varname)
+
+Get the build environment variable $varname value. Record it as being
+accessed.
+
+=cut
+
+sub get {
+    my ($varname) = @_;
+    $env_accessed{$varname} = 1;
+    return $ENV{$varname};
+}
+
+=item $bf->has($varname)
+
+Return a boolean indicating whether the environment variable exists.
+Record it as being accessed.
+
+=cut
+
+sub has {
+    my ($varname) = @_;
+    $env_accessed{$varname} = 1;
+    return exists $ENV{$varname};
+}
+
+=item my @list = $bf->list_accessed()
+
+Returns a list of all environment variables that have been accessed.
+
+=cut
+
+sub list_accessed {
+    my @list = sort keys %env_accessed;
+    return @list;
+}
+
+=item my @list = $bf->list_modified()
+
+Returns a list of all environment variables that have been modified.
+
+=cut
+
+sub list_modified {
+    my @list = sort keys %env_modified;
+    return @list;
+}
+
+=back
+
+=cut
+
+1;