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# 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
should_use_root gain_root_cmd error);
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) || error("fork failed: $!");
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.
my $parallel = $this->get_parallel();
if ($parallel == 0 or $parallel > 1) {
# We have to use the empty string for "unlimited"
$parallel = '' if $parallel == 0;
unshift(@_, "-j${parallel}");
} else {
unshift(@_, '-j1');
}
my @root_cmd;
if (exists($this->{_run_make_as_root}) and $this->{_run_make_as_root}) {
@root_cmd = gain_root_cmd();
}
$this->doit_in_builddir(@root_cmd, $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 $this->get_buildpath("GNUmakefile"))
{
# This is always called in the source directory, but generally
# Makefiles are created (or live) in the build directory.
return 1;
} elsif ($this->check_auto_buildable_clean_oos_buildir(@_)
and $this->check_auto_buildable('configure')) {
# Assume that the package can be cleaned (i.e. the build directory can
# be removed) as long as it is built out-of-source tree and can be
# configured. This is useful for derivative buildsystems which
# generate Makefiles.
return 1;
}
return 0;
}
sub _should_inject_cross_build_tools {
my ($this) = @_;
return ref($this) eq 'Debian::Debhelper::Buildsystem::makefile';
}
sub build {
my $this=shift;
if (not $this->_is_targetbuildsystem
and is_cross_compiling()
and $this->_should_inject_cross_build_tools) {
# Only inject build tools variables during cross-compile when
# makefile is the explicit *main* build system.
for my $var (sort(keys(%DEB_DEFAULT_TOOLS))) {
my $tool = $DEB_DEFAULT_TOOLS{$var};
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();
}
if (should_use_root('debhelper/upstream-make-install') and $< != 0) {
$this->{_run_make_as_root} = 1;
}
$this->make_first_existing_target(['install'],
"DESTDIR=$destdir",
"AM_UPDATE_INFO_DIR=no", @_);
}
sub clean {
my $this=shift;
if (!$this->rmdir_builddir()) {
$this->make_first_existing_target(['distclean', 'realclean', 'clean'], @_);
}
}
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