1 # A module for loading and managing debhelper build system classes.
2 # This module is intended to be used by all dh_auto_* programs.
4 # Copyright: © 2009 Modestas Vainius
7 package Debian::Debhelper::Dh_Buildsystems;
11 use Debian::Debhelper::Dh_Lib;
15 our @EXPORT=qw(&buildsystems_init &buildsystems_do &load_buildsystem &load_all_buildsystems);
17 # Historical order must be kept for backwards compatibility. New
18 # build systems MUST be added to the END of the list.
35 sub create_buildsystem_instance {
38 my $module = "Debian::Debhelper::Buildsystem::$system";
42 error("unable to load build system class '$system': $@");
45 if (!exists $bsopts{builddir} && defined $opt_builddir) {
46 $bsopts{builddir} = ($opt_builddir eq "") ? undef : $opt_builddir;
48 if (!exists $bsopts{sourcedir} && defined $opt_sourcedir) {
49 $bsopts{sourcedir} = ($opt_sourcedir eq "") ? undef : $opt_sourcedir;
51 if (!exists $bsopts{parallel}) {
52 $bsopts{parallel} = $opt_parallel;
54 return $module->new(%bsopts);
57 # Similar to create_build system_instance(), but it attempts to autoselect
58 # a build system if none was specified. In case autoselection fails, undef
60 sub load_buildsystem {
63 if (defined $system) {
64 my $inst = create_buildsystem_instance($system, @_);
68 # Try to determine build system automatically
69 for $system (@BUILDSYSTEMS) {
70 my $inst = create_buildsystem_instance($system, @_);
71 if ($inst->check_auto_buildable($step)) {
79 sub load_all_buildsystems {
80 my $incs=shift || \@INC;
81 my (%buildsystems, @buildsystems);
83 for my $inc (@$incs) {
84 my $path = File::Spec->catdir($inc, "Debian/Debhelper/Buildsystem");
86 for my $module_path (glob "$path/*.pm") {
87 my $name = basename($module_path);
89 next if exists $buildsystems{$name};
90 $buildsystems{$name} = create_buildsystem_instance($name, @_);
95 # Standard debhelper build systems first
96 for my $name (@BUILDSYSTEMS) {
97 error("standard debhelper build system '$name' could not be found/loaded")
98 if not exists $buildsystems{$name};
99 push @buildsystems, $buildsystems{$name};
100 delete $buildsystems{$name};
103 # The rest are 3rd party build systems
104 for my $name (keys %buildsystems) {
105 my $inst = $buildsystems{$name};
106 $inst->{thirdparty} = 1;
107 push @buildsystems, $inst;
110 return @buildsystems;
113 sub buildsystems_init {
116 # Available command line options
118 "D=s" => \$opt_sourcedir,
119 "sourcedirectory=s" => \$opt_sourcedir,
121 "B:s" => \$opt_builddir,
122 "builddirectory:s" => \$opt_builddir,
124 "S=s" => \$opt_buildsys,
125 "buildsystem=s" => \$opt_buildsys,
128 "list" => \$opt_list,
130 "j:i" => \$opt_parallel,
131 "parallel:i" => \$opt_parallel,
133 $args{options}{$_} = $options{$_} foreach keys(%options);
134 Debian::Debhelper::Dh_Lib::init(%args);
136 # Post-process parallel building option. Initially $opt_parallel may have
138 # * undef - no --parallel option was specified. This tells buildsystem class
139 # not to mess with MAKEFLAGS (with the exception of cleaning MAKEFLAGS
140 # from pointless unavailable jobserver options to avoid warnings) nor
142 # * 1 - --parallel=1 option was specified, hence the package should never be
143 # built in parallel mode. Cleans MAKEFLAGS if needed.
144 # * 0 - --parallel was specified without interger argument meaning package
145 # does not want to enforce limit on maximum number of parallel processes.
146 # * N > 1 - --parallel=N was specified where N is the maximum number parallel
147 # processes the package wants to enforce.
148 # Taken DEB_BUILD_OPTIONS and all this into account, set $opt_parallel to the
149 # number of parallel processes to be used for *this* build.
150 if (defined $opt_parallel) {
151 if ($opt_parallel >= 0 && exists $ENV{DEB_BUILD_OPTIONS}) {
152 # Parse parallel=n tag
154 foreach my $opt (split(/\s+/, $ENV{DEB_BUILD_OPTIONS})) {
155 $n = $1 if $opt =~ /^parallel=(\d+)$/;
157 if (defined $n && $n > 0) {
158 $opt_parallel = $n if $opt_parallel == 0 || $n < $opt_parallel;
161 # Invalid value in the parallel tag. Disable.
166 # In case invalid number was passed
172 sub buildsystems_list {
175 # List build systems (including auto and specified status)
176 my ($auto, $specified);
177 for my $inst (load_all_buildsystems()) {
178 my $is_specified = defined $opt_buildsys && $opt_buildsys eq $inst->NAME();
179 if (! defined $specified && defined $opt_buildsys && $opt_buildsys eq $inst->NAME()) {
180 $specified = $inst->NAME();
182 elsif (! defined $auto && ! $inst->{thirdparty} && $inst->check_auto_buildable($step)) {
183 $auto = $inst->NAME();
185 printf("%-20s %s", $inst->NAME(), $inst->DESCRIPTION());
186 print " [3rd party]" if $inst->{thirdparty};
190 print "Auto-selected: $auto\n" if defined $auto;
191 print "Specified: $specified\n" if defined $specified;
192 print "No system auto-selected or specified\n"
193 if ! defined $auto && ! defined $specified;
196 sub buildsystems_do {
199 if (!defined $step) {
200 $step = basename($0);
201 $step =~ s/^dh_auto_//;
204 if (grep(/^\Q$step\E$/, qw{configure build test install clean}) == 0) {
205 error("unrecognized build step: " . $step);
209 buildsystems_list($step);
213 my $buildsystem = load_buildsystem($opt_buildsys, $step);
214 if (defined $buildsystem) {
215 $buildsystem->pre_building_step($step);
216 $buildsystem->$step(@_, @{$dh{U_PARAMS}});
217 $buildsystem->post_building_step($step);