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# Copyright (C) 2002-2018 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::ChannelDefs;
use Automake::Config;
BEGIN
{
if ($perl_threads)
{
require threads;
import threads;
}
}
use Automake::Channels;
=head1 NAME
Automake::ChannelDefs - channel definitions for Automake and helper functions
=head1 SYNOPSIS
use Automake::ChannelDefs;
Automake::ChannelDefs::usage ();
prog_error ($MESSAGE, [%OPTIONS]);
error ($WHERE, $MESSAGE, [%OPTIONS]);
error ($MESSAGE);
fatal ($WHERE, $MESSAGE, [%OPTIONS]);
fatal ($MESSAGE);
verb ($MESSAGE, [%OPTIONS]);
switch_warning ($CATEGORY);
parse_WARNINGS ();
parse_warnings ($OPTION, $ARGUMENT);
Automake::ChannelDefs::set_strictness ($STRICTNESS_NAME);
=head1 DESCRIPTION
This packages defines channels that can be used in Automake to
output diagnostics and other messages (via C<msg()>). It also defines
some helper function to enable or disable these channels, and some
shorthand function to output on specific channels.
=cut
use 5.006;
use strict;
use Exporter;
use vars qw (@ISA @EXPORT);
@ISA = qw (Exporter);
@EXPORT = qw (&prog_error &error &fatal &verb
&switch_warning &parse_WARNINGS &parse_warnings);
=head2 CHANNELS
The following channels can be used as the first argument of
C<Automake::Channel::msg>. For some of them we list a shorthand
function that makes the code more readable.
=over 4
=item C<fatal>
Fatal errors. Use C<&fatal> to send messages over this channel.
=item C<error>
Common errors. Use C<&error> to send messages over this channel.
=item C<error-gnu>
Errors related to GNU Standards.
=item C<error-gnu/warn>
Errors related to GNU Standards that should be warnings in 'foreign' mode.
=item C<error-gnits>
Errors related to GNITS Standards (silent by default).
=item C<automake>
Internal errors. Use C<&prog_error> to send messages over this channel.
=item C<gnu>
Warnings related to GNU Coding Standards.
=item C<obsolete>
Warnings about obsolete features (silent by default).
=item C<override>
Warnings about user redefinitions of Automake rules or
variables (silent by default).
=item C<portability>
Warnings about non-portable constructs.
=item C<extra-portability>
Extra warnings about non-portable constructs covering obscure tools.
=item C<syntax>
Warnings about weird syntax, unused variables, typos...
=item C<unsupported>
Warnings about unsupported (or mis-supported) features.
=item C<verb>
Messages output in C<--verbose> mode. Use C<&verb> to send such messages.
=item C<note>
Informative messages.
=back
=cut
# Initialize our list of error/warning channels.
# Do not forget to update &usage and the manual
# if you add or change a warning channel.
register_channel 'fatal', type => 'fatal', uniq_part => UP_NONE, ordered => 0;
register_channel 'error', type => 'error';
register_channel 'error-gnu', type => 'error';
register_channel 'error-gnu/warn', type => 'error';
register_channel 'error-gnits', type => 'error', silent => 1;
register_channel 'automake', type => 'fatal', backtrace => 1,
header => ("####################\n" .
"## Internal Error ##\n" .
"####################\n"),
footer => "\nPlease contact <$PACKAGE_BUGREPORT>.",
uniq_part => UP_NONE, ordered => 0;
register_channel 'extra-portability', type => 'warning', silent => 1;
register_channel 'gnu', type => 'warning';
register_channel 'obsolete', type => 'warning';
register_channel 'override', type => 'warning', silent => 1;
register_channel 'portability', type => 'warning', silent => 1;
register_channel 'portability-recursive', type => 'warning', silent => 1;
register_channel 'syntax', type => 'warning';
register_channel 'unsupported', type => 'warning';
register_channel 'verb', type => 'debug', silent => 1, uniq_part => UP_NONE,
ordered => 0;
register_channel 'note', type => 'debug', silent => 0;
setup_channel_type 'warning', header => 'warning: ';
setup_channel_type 'error', header => 'error: ';
setup_channel_type 'fatal', header => 'error: ';
=head2 FUNCTIONS
=over 4
=item C<usage ()>
Display warning categories.
=cut
sub usage ()
{
print <<EOF;
Warning categories include:
gnu GNU coding standards (default in gnu and gnits modes)
obsolete obsolete features or constructions
override user redefinitions of Automake rules or variables
portability portability issues (default in gnu and gnits modes)
extra-portability extra portability issues related to obscure tools
syntax dubious syntactic constructs (default)
unsupported unsupported or incomplete features (default)
all all the warnings
no-CATEGORY turn off warnings in CATEGORY
none turn off all the warnings
error treat warnings as errors
EOF
}
=item C<prog_error ($MESSAGE, [%OPTIONS])>
Signal a programming error (on channel C<automake>),
display C<$MESSAGE>, and exit 1.
=cut
sub prog_error ($;%)
{
my ($msg, %opts) = @_;
msg 'automake', '', $msg, %opts;
}
=item C<error ($WHERE, $MESSAGE, [%OPTIONS])>
=item C<error ($MESSAGE)>
Uncategorized errors.
=cut
sub error ($;$%)
{
my ($where, $msg, %opts) = @_;
msg ('error', $where, $msg, %opts);
}
=item C<fatal ($WHERE, $MESSAGE, [%OPTIONS])>
=item C<fatal ($MESSAGE)>
Fatal errors.
=cut
sub fatal ($;$%)
{
my ($where, $msg, %opts) = @_;
msg ('fatal', $where, $msg, %opts);
}
=item C<verb ($MESSAGE, [%OPTIONS])>
C<--verbose> messages.
=cut
sub verb ($;%)
{
my ($msg, %opts) = @_;
$msg = "thread " . threads->tid . ": " . $msg
if $perl_threads;
msg 'verb', '', $msg, %opts;
}
=item C<switch_warning ($CATEGORY)>
If C<$CATEGORY> is C<mumble>, turn on channel C<mumble>.
If it's C<no-mumble>, turn C<mumble> off.
Else handle C<all> and C<none> for completeness.
=cut
sub switch_warning ($)
{
my ($cat) = @_;
my $has_no = 0;
if ($cat =~ /^no-(.*)$/)
{
$cat = $1;
$has_no = 1;
}
if ($cat eq 'all')
{
setup_channel_type 'warning', silent => $has_no;
}
elsif ($cat eq 'none')
{
setup_channel_type 'warning', silent => ! $has_no;
}
elsif ($cat eq 'error')
{
$warnings_are_errors = ! $has_no;
# Set exit code if Perl warns about something
# (like uninitialized variables).
$SIG{"__WARN__"} =
$has_no ? 'DEFAULT' : sub { print STDERR @_; $exit_code = 1; };
}
elsif (channel_type ($cat) eq 'warning')
{
setup_channel $cat, silent => $has_no;
#
# Handling of portability warnings is trickier. For relevant tests,
# see 'dollarvar2', 'extra-portability' and 'extra-portability3'.
#
# -Wportability-recursive and -Wno-portability-recursive should not
# have any effect on other 'portability' or 'extra-portability'
# warnings, so there's no need to handle them separately or ad-hoc.
#
if ($cat eq 'extra-portability' && ! $has_no) # -Wextra-portability
{
# -Wextra-portability must enable 'portability' and
# 'portability-recursive' warnings.
setup_channel 'portability', silent => 0;
setup_channel 'portability-recursive', silent => 0;
}
if ($cat eq 'portability') # -Wportability or -Wno-portability
{
if ($has_no) # -Wno-portability
{
# -Wno-portability must disable 'extra-portability' and
# 'portability-recursive' warnings.
setup_channel 'portability-recursive', silent => 1;
setup_channel 'extra-portability', silent => 1;
}
else # -Wportability
{
# -Wportability must enable 'portability-recursive'
# warnings. But it should have no influence over the
# 'extra-portability' warnings.
setup_channel 'portability-recursive', silent => 0;
}
}
}
else
{
return 1;
}
return 0;
}
=item C<parse_WARNINGS ()>
Parse the WARNINGS environment variable.
=cut
sub parse_WARNINGS ()
{
if (exists $ENV{'WARNINGS'})
{
# Ignore unknown categories. This is required because WARNINGS
# should be honored by many tools.
switch_warning $_ foreach (split (',', $ENV{'WARNINGS'}));
}
}
=item C<parse_warnings ($OPTION, $ARGUMENT)>
Parse the argument of C<--warning=CATEGORY> or C<-WCATEGORY>.
C<$OPTIONS> is C<"--warning"> or C<"-W">, C<$ARGUMENT> is C<CATEGORY>.
This is meant to be used as an argument to C<Getopt>.
=cut
sub parse_warnings ($$)
{
my ($opt, $categories) = @_;
foreach my $cat (split (',', $categories))
{
msg 'unsupported', "unknown warning category '$cat'"
if switch_warning $cat;
}
}
=item C<set_strictness ($STRICTNESS_NAME)>
Configure channels for strictness C<$STRICTNESS_NAME>.
=cut
sub set_strictness ($)
{
my ($name) = @_;
if ($name eq 'gnu')
{
setup_channel 'error-gnu', silent => 0;
setup_channel 'error-gnu/warn', silent => 0, type => 'error';
setup_channel 'error-gnits', silent => 1;
setup_channel 'portability', silent => 0;
setup_channel 'extra-portability', silent => 1;
setup_channel 'gnu', silent => 0;
}
elsif ($name eq 'gnits')
{
setup_channel 'error-gnu', silent => 0;
setup_channel 'error-gnu/warn', silent => 0, type => 'error';
setup_channel 'error-gnits', silent => 0;
setup_channel 'portability', silent => 0;
setup_channel 'extra-portability', silent => 1;
setup_channel 'gnu', silent => 0;
}
elsif ($name eq 'foreign')
{
setup_channel 'error-gnu', silent => 1;
setup_channel 'error-gnu/warn', silent => 0, type => 'warning';
setup_channel 'error-gnits', silent => 1;
setup_channel 'portability', silent => 1;
setup_channel 'extra-portability', silent => 1;
setup_channel 'gnu', silent => 1;
}
else
{
prog_error "level '$name' not recognized";
}
}
=back
=head1 SEE ALSO
L<Automake::Channels>
=head1 HISTORY
Written by Alexandre Duret-Lutz E<lt>F<adl@gnu.org>E<gt>.
=cut
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