Current File : //usr/share/automake-1.16/Automake/Options.pm
# Copyright (C) 2003-2018 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
package Automake::Options;
use 5.006;
use strict;
use Exporter;
use Automake::Config;
use Automake::ChannelDefs;
use Automake::Channels;
use Automake::Version;
use vars qw (@ISA @EXPORT);
@ISA = qw (Exporter);
@EXPORT = qw (option global_option
set_option set_global_option
unset_option unset_global_option
process_option_list process_global_option_list
set_strictness $strictness $strictness_name
&FOREIGN &GNU &GNITS);
=head1 NAME
Automake::Options - keep track of Automake options
=head1 SYNOPSIS
use Automake::Options;
# Option lookup and setting.
$opt = option 'name';
$opt = global_option 'name';
set_option 'name', 'value';
set_global_option 'name', 'value';
unset_option 'name';
unset_global_option 'name';
# Batch option setting.
process_option_list $location, @names;
process_global_option_list $location, @names;
# Strictness lookup and setting.
set_strictness 'foreign';
set_strictness 'gnu';
set_strictness 'gnits';
if ($strictness >= GNU) { ... }
print "$strictness_name\n";
=head1 DESCRIPTION
This packages manages Automake's options and strictness settings.
Options can be either local or global. Local options are set using an
C<AUTOMAKE_OPTIONS> variable in a F<Makefile.am> and apply only to
this F<Makefile.am>. Global options are set from the command line or
passed as an argument to C<AM_INIT_AUTOMAKE>, they apply to all
F<Makefile.am>s.
=cut
# Values are the Automake::Location of the definition.
use vars '%_options'; # From AUTOMAKE_OPTIONS
use vars '%_global_options'; # From AM_INIT_AUTOMAKE or the command line.
# Whether process_option_list has already been called for the current
# Makefile.am.
use vars '$_options_processed';
# Whether process_global_option_list has already been called.
use vars '$_global_options_processed';
=head2 Constants
=over 4
=item FOREIGN
=item GNU
=item GNITS
Strictness constants used as values for C<$strictness>.
=back
=cut
# Constants to define the "strictness" level.
use constant FOREIGN => 0;
use constant GNU => 1;
use constant GNITS => 2;
=head2 Variables
=over 4
=item C<$strictness>
The current strictness. One of C<FOREIGN>, C<GNU>, or C<GNITS>.
=item C<$strictness_name>
The current strictness name. One of C<'foreign'>, C<'gnu'>, or C<'gnits'>.
=back
=cut
# Strictness levels.
use vars qw ($strictness $strictness_name);
# Strictness level as set on command line.
use vars qw ($_default_strictness $_default_strictness_name);
=head2 Functions
=over 4
=item C<Automake::Options::reset>
Reset the options variables for the next F<Makefile.am>.
In other words, this gets rid of all local options in use by the
previous F<Makefile.am>.
=cut
sub reset ()
{
$_options_processed = 0;
%_options = %_global_options;
# The first time we are run,
# remember the current setting as the default.
if (defined $_default_strictness)
{
$strictness = $_default_strictness;
$strictness_name = $_default_strictness_name;
}
else
{
$_default_strictness = $strictness;
$_default_strictness_name = $strictness_name;
}
}
=item C<$value = option ($name)>
=item C<$value = global_option ($name)>
Query the state of an option. If the option is unset, this
returns the empty list. Otherwise it returns the option's value,
as set by C<set_option> or C<set_global_option>.
Note that C<global_option> should be used only when it is
important to make sure an option hasn't been set locally.
Otherwise C<option> should be the standard function to
check for options (be they global or local).
=cut
sub option ($)
{
my ($name) = @_;
return () unless defined $_options{$name};
return $_options{$name};
}
sub global_option ($)
{
my ($name) = @_;
return () unless defined $_global_options{$name};
return $_global_options{$name};
}
=item C<set_option ($name, $value)>
=item C<set_global_option ($name, $value)>
Set an option. By convention, C<$value> is usually the location
of the option definition.
=cut
sub set_option ($$)
{
my ($name, $value) = @_;
$_options{$name} = $value;
}
sub set_global_option ($$)
{
my ($name, $value) = @_;
$_global_options{$name} = $value;
}
=item C<unset_option ($name)>
=item C<unset_global_option ($name)>
Unset an option.
=cut
sub unset_option ($)
{
my ($name) = @_;
delete $_options{$name};
}
sub unset_global_option ($)
{
my ($name) = @_;
delete $_global_options{$name};
}
=item C<process_option_list (@list)>
=item C<process_global_option_list (@list)>
Process Automake's option lists. C<@list> should be a list of hash
references with keys C<option> and C<where>, where C<option> is an
option as they occur in C<AUTOMAKE_OPTIONS> or C<AM_INIT_AUTOMAKE>,
and C<where> is the location where that option occurred.
These functions should be called at most once for each set of options
having the same precedence; i.e., do not call it twice for two options
from C<AM_INIT_AUTOMAKE>.
Return 0 on error, 1 otherwise.
=cut
# $BOOL
# _option_is_from_configure ($OPTION, $WHERE)
# ----------------------------------------------
# Check that the $OPTION given in location $WHERE is specified with
# AM_INIT_AUTOMAKE, not with AUTOMAKE_OPTIONS.
sub _option_is_from_configure ($$)
{
my ($opt, $where)= @_;
return 1
if $where->get =~ /^configure\./;
error $where,
"option '$opt' can only be used as argument to AM_INIT_AUTOMAKE\n" .
"but not in AUTOMAKE_OPTIONS makefile statements";
return 0;
}
# $BOOL
# _is_valid_easy_option ($OPTION)
# -------------------------------
# Explicitly recognize valid automake options that require no
# special handling by '_process_option_list' below.
sub _is_valid_easy_option ($)
{
my $opt = shift;
return scalar grep { $opt eq $_ } qw(
check-news
color-tests
dejagnu
dist-bzip2
dist-lzip
dist-xz
dist-zip
info-in-builddir
no-define
no-dependencies
no-dist
no-dist-gzip
no-exeext
no-installinfo
no-installman
no-texinfo.tex
nostdinc
readme-alpha
serial-tests
parallel-tests
silent-rules
std-options
subdir-objects
);
}
# $BOOL
# _process_option_list (\%OPTIONS, @LIST)
# ------------------------------------------
# Process a list of options. \%OPTIONS is the hash to fill with options
# data. @LIST is a list of options as get passed to public subroutines
# process_option_list() and process_global_option_list() (see POD
# documentation above).
sub _process_option_list (\%@)
{
my ($options, @list) = @_;
my @warnings = ();
my $ret = 1;
foreach my $h (@list)
{
local $_ = $h->{'option'};
my $where = $h->{'where'};
$options->{$_} = $where;
if ($_ eq 'gnits' || $_ eq 'gnu' || $_ eq 'foreign')
{
set_strictness ($_);
}
# TODO: Remove this special check in Automake 3.0.
elsif (/^(.*\/)?ansi2knr$/)
{
# Obsolete (and now removed) de-ANSI-fication support.
error ($where,
"automatic de-ANSI-fication support has been removed");
$ret = 0;
}
# TODO: Remove this special check in Automake 3.0.
elsif ($_ eq 'cygnus')
{
error $where, "support for Cygnus-style trees has been removed";
$ret = 0;
}
# TODO: Remove this special check in Automake 3.0.
elsif ($_ eq 'dist-lzma')
{
error ($where, "support for lzma-compressed distribution " .
"archives has been removed");
$ret = 0;
}
# TODO: Make this a fatal error in Automake 2.0.
elsif ($_ eq 'dist-shar')
{
msg ('obsolete', $where,
"support for shar distribution archives is deprecated.\n" .
" It will be removed in Automake 2.0");
}
# TODO: Make this a fatal error in Automake 2.0.
elsif ($_ eq 'dist-tarZ')
{
msg ('obsolete', $where,
"support for distribution archives compressed with " .
"legacy program 'compress' is deprecated.\n" .
" It will be removed in Automake 2.0");
}
elsif (/^filename-length-max=(\d+)$/)
{
delete $options->{$_};
$options->{'filename-length-max'} = [$_, $1];
}
elsif ($_ eq 'tar-v7' || $_ eq 'tar-ustar' || $_ eq 'tar-pax')
{
if (not _option_is_from_configure ($_, $where))
{
$ret = 0;
}
for my $opt ('tar-v7', 'tar-ustar', 'tar-pax')
{
next
if $opt eq $_ or ! exists $options->{$opt};
error ($where,
"options '$_' and '$opt' are mutually exclusive");
$ret = 0;
}
}
elsif (/^\d+\.\d+(?:\.\d+)?[a-z]?(?:-[A-Za-z0-9]+)?$/)
{
# Got a version number.
if (Automake::Version::check ($VERSION, $&))
{
error ($where, "require Automake $_, but have $VERSION");
$ret = 0;
}
}
elsif (/^(?:--warnings=|-W)(.*)$/)
{
my @w = map { { cat => $_, loc => $where} } split (',', $1);
push @warnings, @w;
}
elsif (! _is_valid_easy_option $_)
{
error ($where, "option '$_' not recognized");
$ret = 0;
}
}
# We process warnings here, so that any explicitly-given warning setting
# will take precedence over warning settings defined implicitly by the
# strictness.
foreach my $w (@warnings)
{
msg 'unsupported', $w->{'loc'},
"unknown warning category '$w->{'cat'}'"
if switch_warning $w->{cat};
}
return $ret;
}
sub process_option_list (@)
{
prog_error "local options already processed"
if $_options_processed;
$_options_processed = 1;
_process_option_list (%_options, @_);
}
sub process_global_option_list (@)
{
prog_error "global options already processed"
if $_global_options_processed;
$_global_options_processed = 1;
_process_option_list (%_global_options, @_);
}
=item C<set_strictness ($name)>
Set the current strictness level.
C<$name> should be one of C<'foreign'>, C<'gnu'>, or C<'gnits'>.
=cut
# Set strictness.
sub set_strictness ($)
{
$strictness_name = $_[0];
Automake::ChannelDefs::set_strictness ($strictness_name);
if ($strictness_name eq 'gnu')
{
$strictness = GNU;
}
elsif ($strictness_name eq 'gnits')
{
$strictness = GNITS;
}
elsif ($strictness_name eq 'foreign')
{
$strictness = FOREIGN;
}
else
{
prog_error "level '$strictness_name' not recognized";
}
}
1;