Support building on case-insensitive filesystems

Move Debian/ to lib subdirectory to support building on
non-case-sensitive filesystems.

1 files changed, 178 insertions, 0 deletions

diff --git a/lib/Debian/Debhelper/Buildsystem/makefile.pm b/lib/Debian/Debhelper/Buildsystem/makefile.pm
new file mode 100644
index 00000000..02008a25
--- /dev/null
+++ b/lib/Debian/Debhelper/Buildsystem/makefile.pm
@@ -0,0 +1,178 @@
+# 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 warnings;
+use Debian::Debhelper::Dh_Lib qw(dpkg_architecture_value escape_shell clean_jobserver_makeflags is_cross_compiling compat);
+use parent qw(Debian::Debhelper::Buildsystem);
+
+my %DEB_DEFAULT_TOOLS = (
+	'CC'		=> 'gcc',
+	'CXX'		=> 'g++',
+	'PKG_CONFIG'	=> 'pkg-config',
+);
+
+# 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 $this=shift;
+	if (ref($this) eq 'Debian::Debhelper::Buildsystem::makefile' and is_cross_compiling()) {
+		while (my ($var, $tool) = each %DEB_DEFAULT_TOOLS) {
+			if ($ENV{$var}) {
+				unshift @_, $var . "=" . $ENV{$var};
+			} else {
+				unshift @_, $var . "=" . dpkg_architecture_value("DEB_HOST_GNU_TYPE") . "-" . $tool;
+			}
+		}
+	}
+	if (ref($this) eq 'Debian::Debhelper::Buildsystem::makefile' and not compat(10)) {
+		unshift @_, "INSTALL=install --strip-program=true";
+	}
+	$this->do_make(@_);
+}
+
+sub test {
+	my $this=shift;
+	$this->make_first_existing_target(['test', 'check'], @_);
+}
+
+sub install {
+	my $this=shift;
+	my $destdir=shift;
+	if (ref($this) eq 'Debian::Debhelper::Buildsystem::makefile' and not compat(10)) {
+		unshift @_, "INSTALL=install --strip-program=true";
+	}
+	if ( -f $this->get_buildpath('libtool')) {
+		$this->disable_parallel();
+	}
+
+	$this->make_first_existing_target(['install'],
+		"DESTDIR=$destdir",
+		"AM_UPDATE_INFO_DIR=no", @_);
+}
+
+sub clean {
+	my $this=shift;
+	if (!$this->rmdir_builddir()) {
+		$this->make_first_existing_target(['distclean', 'realclean', 'clean'], @_);
+	}
+}
+
+1