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backtrace.pm
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backtrace.pm
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# Copyright (C) 2001-2007, Parrot Foundation.
=head1 NAME
config/auto/backtrace.pm - GNU C Compiler
=head1 DESCRIPTION
Determines whether libc has the backtrace* functions. The backtrace() and
backtrace_symbols() functions exist in GNU libc, and also in OS X versions
10.5+.
=cut
package auto::backtrace;
use strict;
use warnings;
use base qw(Parrot::Configure::Step);
use Parrot::Configure::Utils ':auto';
sub _init {
my $self = shift;
my %data;
$data{description} = q{Does libc have the backtrace* functions};
$data{result} = q{};
return \%data;
}
sub runstep {
my ( $self, $conf ) = @_;
my $anyerror = _probe_for_backtrace($conf);
$self->_evaluate_backtrace($conf, $anyerror);
return 1;
}
sub _probe_for_backtrace {
my $conf = shift;
$conf->cc_gen("config/auto/backtrace/test_c.in");
# If the program builds (e.g. the linker found backtrace* in libc)
# then we have the "backtrace" and "backtrace_symbols" functions. If the
# program fails to build for whatever reason we're just going to assume
# that the build failure is because these symbols are missing.
eval { $conf->cc_build(); };
my $anyerror = $@;
$conf->cc_clean();
return $anyerror;
}
sub _probe_for_dlinfo {
my $conf = shift;
$conf->cc_gen("config/auto/backtrace/test_dlinfo_c.in");
# If the program compiles, the Dl_info struct is available
eval { $conf->cc_compile(); };
my $anyerror = $@;
$conf->cc_clean();
return $anyerror;
}
sub _evaluate_backtrace {
my ($self, $conf, $anyerror) = @_;
if ( $anyerror ) {
$self->set_result("no");
}
else {
my $dlinfoerror = _probe_for_dlinfo($conf);
$conf->data->set ( PARROT_HAS_DLINFO => 1 ) unless $anyerror;
$conf->data->set( backtrace => 1 );
$self->set_result("yes");
}
}
1;
# Local Variables:
# mode: cperl
# cperl-indent-level: 4
# fill-column: 100
# End:
# vim: expandtab shiftwidth=4: