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Diffstat (limited to 'Debian/Debhelper/Buildsystem/makefile.pm')
| -rw-r--r-- | Debian/Debhelper/Buildsystem/makefile.pm | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/Debian/Debhelper/Buildsystem/makefile.pm b/Debian/Debhelper/Buildsystem/makefile.pm new file mode 100644 index 00000000..dcc5da87 --- /dev/null +++ b/Debian/Debhelper/Buildsystem/makefile.pm @@ -0,0 +1,152 @@ +# A debhelper build system class for handling simple Makefile based projects. +# +# Copyright: © 2008 Joey Hess +# © 2008-2009 Modestas Vainius +# License: GPL-2+ + +package Debian::Debhelper::Buildsystem::makefile; + +use strict; +use Debian::Debhelper::Dh_Lib qw(escape_shell clean_jobserver_makeflags); +use base 'Debian::Debhelper::Buildsystem'; + +# make makes things difficult by not providing a simple way to test +# whether a Makefile target exists. Using -n and checking for a nonzero +# exit status is not good enough, because even with -n, make will +# run commands needed to eg, generate include files -- and those commands +# could fail even though the target exists -- and we should let the target +# run and propagate any failure. +# +# Using -n and checking for at least one line of output is better. +# That will indicate make either wants to run one command, or +# has output a "nothing to be done" message if the target exists but is a +# noop. +# +# However, that heuristic is also not good enough, because a Makefile +# could run code that outputs something, even though the -n is asking +# it not to run anything. (Again, done for includes.) To detect this false +# positive, there is unfortunately only one approach left: To +# look for the error message printed by make when a target does not exist. +# +# This could break if make's output changes. It would only break a minority +# of packages where this latter test is needed. The best way to avoid that +# problem would be to fix make to have this simple and highly useful +# missing feature. +# +# A final option would be to use -p and parse the output data base. +# It's more practical for dh to use that method, since it operates on +# only special debian/rules files, and not arbitrary Makefiles which +# can be arbitrarily complicated, use implicit targets, and so on. +sub exists_make_target { + my $this=shift; + my $target=shift; + + my @opts=("-s", "-n", "--no-print-directory"); + my $buildpath = $this->get_buildpath(); + unshift @opts, "-C", $buildpath if $buildpath ne "."; + + my $pid = open(MAKE, "-|"); + defined($pid) || die "can't fork: $!"; + if (! $pid) { + open(STDERR, ">&STDOUT"); + $ENV{LC_ALL}='C'; + exec($this->{makecmd}, @opts, $target, @_); + exit(1); + } + + local $/=undef; + my $output=<MAKE>; + chomp $output; + close MAKE; + + return defined $output + && length $output + && $output !~ /\*\*\* No rule to make target `\Q$target\E'/; +} + +sub do_make { + my $this=shift; + + # Avoid possible warnings about unavailable jobserver, + # and force make to start a new jobserver. + clean_jobserver_makeflags(); + + # Note that this will override any -j settings in MAKEFLAGS. + unshift @_, "-j" . ($this->get_parallel() > 0 ? $this->get_parallel() : ""); + + $this->doit_in_builddir($this->{makecmd}, @_); +} + +sub make_first_existing_target { + my $this=shift; + my $targets=shift; + + foreach my $target (@$targets) { + if ($this->exists_make_target($target, @_)) { + $this->do_make($target, @_); + return $target; + } + } + return undef; +} + +sub DESCRIPTION { + "simple Makefile" +} + +sub new { + my $class=shift; + my $this=$class->SUPER::new(@_); + $this->{makecmd} = (exists $ENV{MAKE}) ? $ENV{MAKE} : "make"; + return $this; +} + +sub check_auto_buildable { + my $this=shift; + my ($step) = @_; + + if (-e $this->get_buildpath("Makefile") || + -e $this->get_buildpath("makefile") || + -e $this->get_buildpath("GNUmakefile")) + { + # This is always called in the source directory, but generally + # Makefiles are created (or live) in the build directory. + return 1; + } elsif ($step eq "clean" && defined $this->get_builddir() && + $this->check_auto_buildable("configure")) + { + # Assume that the package can be cleaned (i.e. the build directory can + # be removed) as long as it is built out-of-source tree and can be + # configured. This is useful for derivative buildsystems which + # generate Makefiles. + return 1; + } + return 0; +} + +sub build { + my $this=shift; + $this->do_make(@_); +} + +sub test { + my $this=shift; + $this->make_first_existing_target(['test', 'check'], @_); +} + +sub install { + my $this=shift; + my $destdir=shift; + $this->make_first_existing_target(['install'], + "DESTDIR=$destdir", + "AM_UPDATE_INFO_DIR=no", @_); +} + +sub clean { + my $this=shift; + if (!$this->rmdir_builddir()) { + $this->make_first_existing_target(['distclean', 'realclean', 'clean'], @_); + } +} + +1 |