1 # Defines debhelper buildsystem class interface and implementation
2 # of common functionality.
4 # Copyright: © 2008-2009 Modestas Vainius
7 package Debian::Debhelper::Dh_Buildsystem;
13 use Debian::Debhelper::Dh_Lib;
15 # Cache DEB_BUILD_GNU_TYPE value. Performance hit of multiple
16 # invocations is noticable when listing buildsystems.
17 our $DEB_BUILD_GNU_TYPE = dpkg_architecture_value("DEB_BUILD_GNU_TYPE");
19 # Build system name. Defaults to the last component of the class
20 # name. Do not override this method unless you know what you are
24 my $cls = ref($self) || $self;
25 if ($cls =~ m/^.+::([^:]+)$/) {
29 error("ınvalid buildsystem class name: $cls");
33 # Description of the build system to be shown to the users.
35 "basic debhelper build system class (please provide description)";
38 # Default build directory. Can be overriden in the derived
39 # class if really needed.
40 sub DEFAULT_BUILD_DIRECTORY {
41 "obj-" . $DEB_BUILD_GNU_TYPE;
44 # Constructs a new build system object. Named parameters:
45 # - builddir - specifies build directory to use. If not specified,
46 # in-source build will be performed. If undef or empty,
47 # default DEFAULT_BUILD_DIRECTORY will be used.
48 # - build_action - set this parameter to the name of the build action
49 # if you want the object to determine its is_buidable
50 # status automatically (with check_auto_buildable()).
51 # Do not pass this parameter if is_buildable flag should
52 # be forced to true or set this parameter to undef if
53 # is_buildable flag should be false.
54 # Derived class can override the constructor to initialize common object
55 # parameters and execute commands to configure build environment if
56 # is_buildable flag is set on the object.
58 # XXX JEH the above comment begs the question: Why not test
59 # is_auto_buildable in the constructor, and only have the constructor
60 # succeed if it can handle the source? That would also eliminate the
61 # delayed warning mess in enforce_in_source_building.
62 # XXX MDX Yes, that warning stuff was a mess. I implemented your
65 # XXX JEH AFAICS, there is only one reason you need an instance of the object
66 # if it can't build -- to list build systems. But that only needs
67 # DESCRIPTION and NAME, which could be considered to be class methods,
68 # rather than object methods -- no need to construct an instance of the
69 # class before calling those.
70 # XXX MDX Well yeah, they used to be (and still can be used) as such. But I
71 # implemented a new feature to show force/auto_buildable status
72 # while listing buildsystems. That feature needs an instance.
74 # XXX JEH I see that if --buildsystem is manually specified to override,
75 # the is_auto_buildable test is completely skipped. So if this change were
76 # made, you'd not be able to skip the test, and some --buildsystem choices
77 # might cause an error. OTOH, those seem to be cases where it would later
78 # fail anyway. The real use cases for --buildsystem, such as forcing use of
79 # cmake when there are both a CMakeLists.txt and a Makefile, would still
81 # XXX MDX 1) If buildsystem is forced, there might be a good reason for it.
82 # What is more, that check as it is now is for *auto* stuff only.
83 # In general, it cannot be used to reliably check if the source
84 # will be buildable or not.
85 # 2) Your last sentence is not entirely true. Backwards compatibility
86 # is also a huge limitation. The check_auto_buildable() should always
87 # fail if it is not possible to add a new buildsystem in the backwards
88 # compatible manner. See also my comments in the makefile.pm.
89 # 3) What is more, I implemented skipping of the auto buildable check,
90 # so this is no longer the issue.
95 my $self = bless({ builddir => undef, is_buildable => 1 }, $cls);
96 if (exists $opts{builddir}) {
97 if ($opts{builddir}) {
98 $self->{builddir} = $opts{builddir};
101 $self->{builddir} = $self->DEFAULT_BUILD_DIRECTORY();
104 if (exists $opts{build_action}) {
105 if (defined $opts{build_action}) {
106 $self->{is_buildable} = $self->check_auto_buildable($opts{build_action});
109 $self->{is_buildable} = 0;
115 # Test is_buildable flag of the object.
118 return $self->{is_buildable};
121 # This instance method is called to check if the build system is capable
122 # to auto build a source package. Additional argument $action describes
123 # which operation the caller is going to perform (either configure,
124 # build, test, install or clean). You must override this method for the
125 # build system module to be ever picked up automatically. This method is
126 # used in conjuction with @Dh_Buildsystems::BUILDSYSTEMS.
128 # This method is supposed to be called with source root directory being
129 # working directory. Use $self->get_buildpath($path) method to get full
130 # path to the files in the build directory.
131 sub check_auto_buildable {
137 # Derived class can call this method in its constructor
138 # to enforce in-source building even if the user requested otherwise.
139 sub enforce_in_source_building {
141 if ($self->{builddir}) {
142 # Do not emit warning unless the object is buildable.
143 if ($self->is_buildable()) {
144 warning("warning: " . $self->NAME() .
145 " does not support building outside-source. In-source build enforced.");
147 $self->{builddir} = undef;
151 # Derived class can call this method in its constructor to enforce
152 # outside-source building even if the user didn't request it.
153 sub enforce_outside_source_building {
154 my ($self, $builddir) = @_;
155 if (!defined $self->{builddir}) {
156 $self->{builddir} = ($builddir && $builddir ne ".") ? $builddir : $self->DEFAULT_BUILD_DIRECTORY();
160 # Get path to the specified build directory
163 return $self->{builddir};
166 # Construct absolute path to the file from the given path that is relative
167 # to the build directory.
169 my ($self, $path) = @_;
170 if ($self->get_builddir()) {
171 return File::Spec->catfile($self->get_builddir(), $path);
174 return File::Spec->catfile('.', $path);
178 # When given a relative path in the source tree, converts it
179 # to the path that is relative to the build directory.
180 # If $path is not given, returns relative path to the root of the
181 # source tree from the build directory.
182 sub get_rel2builddir_path {
187 $path = File::Spec->catfile(Cwd::getcwd(), $path);
190 $path = Cwd::getcwd();
192 if ($self->get_builddir()) {
193 return File::Spec->abs2rel($path, Cwd::abs_path($self->get_builddir()));
200 # XXX JEH is there any reason not to just doit("mkdir") ?
201 # XXX MDX Replaced below part. This call is there to be
202 # more verbose about errors (if accidently $dir in
203 # non-dir form and to test for ! -d $dir.
204 if (-e $dir && ! -d $dir) {
205 error("error: unable to create '$dir': object already exists and is not a directory");
217 verbose_print("cd $dir");
218 chdir $dir or error("error: unable to chdir to $dir");
222 # Creates a build directory. Returns 1 if the directory was created
223 # or 0 if it already exists or there is no need to create it.
226 if ($self->get_builddir()) {
227 return $self->_mkdir($self->get_builddir());
232 # Changes working directory the build directory (if needed), calls doit(@_)
233 # and changes working directory back to the source directory.
234 sub doit_in_builddir {
236 if ($self->get_builddir()) {
237 my $builddir = $self->get_builddir();
238 my $sourcedir = $self->get_rel2builddir_path();
239 $self->_cd($builddir);
241 $self->_cd($sourcedir);
249 # In case of outside-source tree building, whole build directory
250 # gets wiped (if it exists) and 1 is returned. Otherwise, nothing
251 # is done and 0 is returned.
254 if ($self->get_builddir()) {
255 if (-d $self->get_builddir()) {
256 doit("rm", "-rf", $self->get_builddir());
264 # Instance method that is called before performing any action (see below).
265 # Action name is passed as an argument. Derived classes overriding this
266 # method should also call SUPER implementation of it.
272 # Instance method that is called after performing any action (see below).
273 # Action name is passed as an argument. Derived classes overriding this
274 # method should also call SUPER implementation of it.
280 # The instance methods below provide support for configuring,
281 # building, testing, install and cleaning source packages.
282 # In case of failure, the method may just error() out.
284 # These methods should be overriden by derived classes to
285 # implement buildsystem specific actions needed to build the
286 # source. Arbitary number of custom action arguments might be
287 # passed. Default implementations do nothing.
300 # destdir parameter specifies where to install files.