[p5sagit/p5-mst-13.2.git] / lib / ExtUtils / Mksymlists.pm

package ExtUtils::Mksymlists;
use strict qw[ subs refs ];
# no strict 'vars';  # until filehandles are exempted

use Carp;
use Exporter;
use vars qw( @ISA @EXPORT $VERSION );
@ISA = 'Exporter';
@EXPORT = '&Mksymlists';
$VERSION = substr q$Revision: 1.17 $, 10;

sub Mksymlists {
    my(%spec) = @_;
    my($osname) = $^O;

    croak("Insufficient information specified to Mksymlists")
        unless ( $spec{NAME} or
                 ($spec{FILE} and ($spec{DL_FUNCS} or $spec{FUNCLIST})) );

    $spec{DL_VARS} = [] unless $spec{DL_VARS};
    ($spec{FILE} = $spec{NAME}) =~ s/.*::// unless $spec{FILE};
    $spec{FUNCLIST} = [] unless $spec{FUNCLIST};
    $spec{DL_FUNCS} = { $spec{NAME} => [] }
        unless ( ($spec{DL_FUNCS} and keys %{$spec{DL_FUNCS}}) or
                 @{$spec{FUNCLIST}});
    if (defined $spec{DL_FUNCS}) {
        my($package);
        foreach $package (keys %{$spec{DL_FUNCS}}) {
            my($packprefix,$sym,$bootseen);
            ($packprefix = $package) =~ s/\W/_/g;
            foreach $sym (@{$spec{DL_FUNCS}->{$package}}) {
                if ($sym =~ /^boot_/) {
                    push(@{$spec{FUNCLIST}},$sym);
                    $bootseen++;
                }
                else { push(@{$spec{FUNCLIST}},"XS_${packprefix}_$sym"); }
            }
            push(@{$spec{FUNCLIST}},"boot_$packprefix") unless $bootseen;
        }
    }

#    We'll need this if we ever add any OS which uses mod2fname
#    not as pseudo-builtin.
#    require DynaLoader;
    if (defined &DynaLoader::mod2fname and not $spec{DLBASE}) {
        $spec{DLBASE} = DynaLoader::mod2fname([ split(/::/,$spec{NAME}) ]);
    }

    if    ($osname eq 'aix') { _write_aix(\%spec); }
    elsif ($osname eq 'VMS') { _write_vms(\%spec) }
    elsif ($osname eq 'os2') { _write_os2(\%spec) }
    elsif ($osname eq 'MSWin32') { _write_win32(\%spec) }
    else { croak("Don't know how to create linker option file for $osname\n"); }
}


sub _write_aix {
    my($data) = @_;

    rename "$data->{FILE}.exp", "$data->{FILE}.exp_old";

    open(EXP,">$data->{FILE}.exp")
        or croak("Can't create $data->{FILE}.exp: $!\n");
    print EXP join("\n",@{$data->{DL_VARS}}, "\n") if @{$data->{DL_VARS}};
    print EXP join("\n",@{$data->{FUNCLIST}}, "\n") if @{$data->{FUNCLIST}};
    close EXP;
}


sub _write_os2 {
    my($data) = @_;
    require Config;
    my $threaded = ($Config::Config{archname} =~ /-thread/ ? " threaded" : "");

    if (not $data->{DLBASE}) {
        ($data->{DLBASE} = $data->{NAME}) =~ s/.*:://;
        $data->{DLBASE} = substr($data->{DLBASE},0,7) . '_';
    }
    my $distname = $data->{DISTNAME} || $data->{NAME};
    $distname = "Distribution $distname";
    my $comment = "Perl (v$]$threaded) module $data->{NAME}";
    if ($data->{INSTALLDIRS} and $data->{INSTALLDIRS} eq 'perl') {
	$distname = 'perl5-porters@perl.org';
	$comment = "Core $comment";
    }
    rename "$data->{FILE}.def", "$data->{FILE}_def.old";

    open(DEF,">$data->{FILE}.def")
        or croak("Can't create $data->{FILE}.def: $!\n");
    print DEF "LIBRARY '$data->{DLBASE}' INITINSTANCE TERMINSTANCE\n";
    print DEF "DESCRIPTION '\@#$distname:$data->{VERSION}#\@ $comment'\n";
    print DEF "CODE LOADONCALL\n";
    print DEF "DATA LOADONCALL NONSHARED MULTIPLE\n";
    print DEF "EXPORTS\n  ";
    print DEF join("\n  ",@{$data->{DL_VARS}}, "\n") if @{$data->{DL_VARS}};
    print DEF join("\n  ",@{$data->{FUNCLIST}}, "\n") if @{$data->{FUNCLIST}};
    if (%{$data->{IMPORTS}}) {
        print DEF "IMPORTS\n";
	my ($name, $exp);
	while (($name, $exp)= each %{$data->{IMPORTS}}) {
	    print DEF "  $name=$exp\n";
	}
    }
    close DEF;
}

sub _write_win32 {
    my($data) = @_;

    require Config;
    if (not $data->{DLBASE}) {
        ($data->{DLBASE} = $data->{NAME}) =~ s/.*:://;
        $data->{DLBASE} = substr($data->{DLBASE},0,7) . '_';
    }
    rename "$data->{FILE}.def", "$data->{FILE}_def.old";

    open(DEF,">$data->{FILE}.def")
        or croak("Can't create $data->{FILE}.def: $!\n");
    # put library name in quotes (it could be a keyword, like 'Alias')
    if ($Config::Config{'cc'} !~ /^gcc/i) {
      print DEF "LIBRARY \"$data->{DLBASE}\"\n";
    }
    print DEF "EXPORTS\n  ";
    my @syms;
    # Export public symbols both with and without underscores to
    # ensure compatibility between DLLs from different compilers
    # NOTE: DynaLoader itself only uses the names without underscores,
    # so this is only to cover the case when the extension DLL may be
    # linked to directly from C. GSAR 97-07-10
    if ($Config::Config{'cc'} =~ /^bcc/i) {
	for (@{$data->{DL_VARS}}, @{$data->{FUNCLIST}}) {
	    push @syms, "_$_", "$_ = _$_";
	}
    }
    else {
	for (@{$data->{DL_VARS}}, @{$data->{FUNCLIST}}) {
	    push @syms, "$_", "_$_ = $_";
	}
    }
    print DEF join("\n  ",@syms, "\n") if @syms;
    if (%{$data->{IMPORTS}}) {
        print DEF "IMPORTS\n";
        my ($name, $exp);
        while (($name, $exp)= each %{$data->{IMPORTS}}) {
            print DEF "  $name=$exp\n";
        }
    }
    close DEF;
}


sub _write_vms {
    my($data) = @_;

    require Config; # a reminder for once we do $^O
    require ExtUtils::XSSymSet;

    my($isvax) = $Config::Config{'arch'} =~ /VAX/i;
    my($set) = new ExtUtils::XSSymSet;
    my($sym);

    rename "$data->{FILE}.opt", "$data->{FILE}.opt_old";

    open(OPT,">$data->{FILE}.opt")
        or croak("Can't create $data->{FILE}.opt: $!\n");

    # Options file declaring universal symbols
    # Used when linking shareable image for dynamic extension,
    # or when linking PerlShr into which we've added this package
    # as a static extension
    # We don't do anything to preserve order, so we won't relax
    # the GSMATCH criteria for a dynamic extension

    foreach $sym (@{$data->{FUNCLIST}}) {
        my $safe = $set->addsym($sym);
        if ($isvax) { print OPT "UNIVERSAL=$safe\n" }
        else        { print OPT "SYMBOL_VECTOR=($safe=PROCEDURE)\n"; }
    }
    foreach $sym (@{$data->{DL_VARS}}) {
        my $safe = $set->addsym($sym);
        print OPT "PSECT_ATTR=${sym},PIC,OVR,RD,NOEXE,WRT,NOSHR\n";
        if ($isvax) { print OPT "UNIVERSAL=$safe\n" }
        else        { print OPT "SYMBOL_VECTOR=($safe=DATA)\n"; }
    }
    close OPT;

}

1;

__END__

=head1 NAME

ExtUtils::Mksymlists - write linker options files for dynamic extension

=head1 SYNOPSIS

    use ExtUtils::Mksymlists;
    Mksymlists({ NAME     => $name ,
                 DL_VARS  => [ $var1, $var2, $var3 ],
                 DL_FUNCS => { $pkg1 => [ $func1, $func2 ],
                               $pkg2 => [ $func3 ] });

=head1 DESCRIPTION

C<ExtUtils::Mksymlists> produces files used by the linker under some OSs
during the creation of shared libraries for dynamic extensions.  It is
normally called from a MakeMaker-generated Makefile when the extension
is built.  The linker option file is generated by calling the function
C<Mksymlists>, which is exported by default from C<ExtUtils::Mksymlists>.
It takes one argument, a list of key-value pairs, in which the following
keys are recognized:

=over

=item DLBASE

This item specifies the name by which the linker knows the
extension, which may be different from the name of the
extension itself (for instance, some linkers add an '_' to the
name of the extension).  If it is not specified, it is derived
from the NAME attribute.  It is presently used only by OS2 and Win32.

=item DL_FUNCS

This is identical to the DL_FUNCS attribute available via MakeMaker,
from which it is usually taken.  Its value is a reference to an
associative array, in which each key is the name of a package, and
each value is an a reference to an array of function names which
should be exported by the extension.  For instance, one might say
C<DL_FUNCS =E<gt> { Homer::Iliad =E<gt> [ qw(trojans greeks) ],
Homer::Odyssey =E<gt> [ qw(travellers family suitors) ] }>.  The
function names should be identical to those in the XSUB code;
C<Mksymlists> will alter the names written to the linker option
file to match the changes made by F<xsubpp>.  In addition, if
none of the functions in a list begin with the string B<boot_>,
C<Mksymlists> will add a bootstrap function for that package,
just as xsubpp does.  (If a B<boot_E<lt>pkgE<gt>> function is
present in the list, it is passed through unchanged.)  If
DL_FUNCS is not specified, it defaults to the bootstrap
function for the extension specified in NAME.

=item DL_VARS

This is identical to the DL_VARS attribute available via MakeMaker,
and, like DL_FUNCS, it is usually specified via MakeMaker.  Its
value is a reference to an array of variable names which should
be exported by the extension.

=item FILE

This key can be used to specify the name of the linker option file
(minus the OS-specific extension), if for some reason you do not
want to use the default value, which is the last word of the NAME
attribute (I<e.g.> for C<Tk::Canvas>, FILE defaults to C<Canvas>).

=item FUNCLIST

This provides an alternate means to specify function names to be
exported from the extension.  Its value is a reference to an
array of function names to be exported by the extension.  These
names are passed through unaltered to the linker options file.
Specifying a value for the FUNCLIST attribute suppresses automatic
generation of the bootstrap function for the package. To still create
the bootstrap name you have to specify the package name in the
DL_FUNCS hash:

    Mksymlists({ NAME     => $name ,
		 FUNCLIST => [ $func1, $func2 ],
                 DL_FUNCS => { $pkg => [] } });


=item IMPORTS

This attribute is used to specify names to be imported into the
extension. It is currently only used by OS/2 and Win32.

=item NAME

This gives the name of the extension (I<e.g.> C<Tk::Canvas>) for which
the linker option file will be produced.

=back

When calling C<Mksymlists>, one should always specify the NAME
attribute.  In most cases, this is all that's necessary.  In
the case of unusual extensions, however, the other attributes
can be used to provide additional information to the linker.

=head1 AUTHOR

Charles Bailey I<E<lt>bailey@newman.upenn.eduE<gt>>

=head1 REVISION

Last revised 14-Feb-1996, for Perl 5.002.
Commit	Line	Data
c07a80fd	1	package ExtUtils::Mksymlists;
	2	use strict qw[ subs refs ];
	3	# no strict 'vars'; # until filehandles are exempted
	4
	5	use Carp;
c07a80fd	6	use Exporter;
f1387719	7	use vars qw( @ISA @EXPORT $VERSION );
	8	@ISA = 'Exporter';
	9	@EXPORT = '&Mksymlists';
6ee623d5	10	$VERSION = substr q$Revision: 1.17 $, 10;
c07a80fd	11
	12	sub Mksymlists {
	13	my(%spec) = @_;
f1387719	14	my($osname) = $^O;
c07a80fd	15
	16	croak("Insufficient information specified to Mksymlists")
	17	unless ( $spec{NAME} or
	18	($spec{FILE} and ($spec{DL_FUNCS} or $spec{FUNCLIST})) );
	19
	20	$spec{DL_VARS} = [] unless $spec{DL_VARS};
	21	($spec{FILE} = $spec{NAME}) =~ s/.*::// unless $spec{FILE};
348844dc	22	$spec{FUNCLIST} = [] unless $spec{FUNCLIST};
c07a80fd	23	$spec{DL_FUNCS} = { $spec{NAME} => [] }
c07a80fd	24	unless ( ($spec{DL_FUNCS} and keys %{$spec{DL_FUNCS}}) or
348844dc	25	@{$spec{FUNCLIST}});
c07a80fd	26	if (defined $spec{DL_FUNCS}) {
	27	my($package);
	28	foreach $package (keys %{$spec{DL_FUNCS}}) {
	29	my($packprefix,$sym,$bootseen);
	30	($packprefix = $package) =~ s/\W/_/g;
	31	foreach $sym (@{$spec{DL_FUNCS}->{$package}}) {
	32	if ($sym =~ /^boot_/) {
	33	push(@{$spec{FUNCLIST}},$sym);
	34	$bootseen++;
	35	}
	36	else { push(@{$spec{FUNCLIST}},"XS_${packprefix}_$sym"); }
	37	}
	38	push(@{$spec{FUNCLIST}},"boot_$packprefix") unless $bootseen;
	39	}
	40	}
	41
	42	# We'll need this if we ever add any OS which uses mod2fname
760ac839	43	# not as pseudo-builtin.
c07a80fd	44	# require DynaLoader;
c2e89b3d	45	if (defined &DynaLoader::mod2fname and not $spec{DLBASE}) {
	46	$spec{DLBASE} = DynaLoader::mod2fname([ split(/::/,$spec{NAME}) ]);
	47	}
c07a80fd	48
f1387719	49	if ($osname eq 'aix') { _write_aix(\%spec); }
f1387719	50	elsif ($osname eq 'VMS') { _write_vms(\%spec) }
bab2b58e	51	elsif ($osname eq 'os2') { _write_os2(\%spec) }
68dc0745	52	elsif ($osname eq 'MSWin32') { _write_win32(\%spec) }
f1387719	53	else { croak("Don't know how to create linker option file for $osname\n"); }
c07a80fd	54	}
	55
	56
	57	sub _write_aix {
	58	my($data) = @_;
	59
	60	rename "$data->{FILE}.exp", "$data->{FILE}.exp_old";
	61
	62	open(EXP,">$data->{FILE}.exp")
	63	or croak("Can't create $data->{FILE}.exp: $!\n");
	64	print EXP join("\n",@{$data->{DL_VARS}}, "\n") if @{$data->{DL_VARS}};
	65	print EXP join("\n",@{$data->{FUNCLIST}}, "\n") if @{$data->{FUNCLIST}};
	66	close EXP;
	67	}
	68
	69
	70	sub _write_os2 {
	71	my($data) = @_;
6ee623d5	72	require Config;
6ee623d5	73	my $threaded = ($Config::Config{archname} =~ /-thread/ ? " threaded" : "");
c07a80fd	74
	75	if (not $data->{DLBASE}) {
	76	($data->{DLBASE} = $data->{NAME}) =~ s/.*:://;
	77	$data->{DLBASE} = substr($data->{DLBASE},0,7) . '_';
	78	}
3cfae81b	79	my $distname = $data->{DISTNAME} \|\| $data->{NAME};
	80	$distname = "Distribution $distname";
	81	my $comment = "Perl (v$]$threaded) module $data->{NAME}";
	82	if ($data->{INSTALLDIRS} and $data->{INSTALLDIRS} eq 'perl') {
	83	$distname = 'perl5-porters@perl.org';
	84	$comment = "Core $comment";
	85	}
c07a80fd	86	rename "$data->{FILE}.def", "$data->{FILE}_def.old";
	87
	88	open(DEF,">$data->{FILE}.def")
	89	or croak("Can't create $data->{FILE}.def: $!\n");
	90	print DEF "LIBRARY '$data->{DLBASE}' INITINSTANCE TERMINSTANCE\n";
3cfae81b	91	print DEF "DESCRIPTION '\@#$distname:$data->{VERSION}#\@ $comment'\n";
c07a80fd	92	print DEF "CODE LOADONCALL\n";
c07a80fd	93	print DEF "DATA LOADONCALL NONSHARED MULTIPLE\n";
c2e89b3d	94	print DEF "EXPORTS\n ";
	95	print DEF join("\n ",@{$data->{DL_VARS}}, "\n") if @{$data->{DL_VARS}};
	96	print DEF join("\n ",@{$data->{FUNCLIST}}, "\n") if @{$data->{FUNCLIST}};
	97	if (%{$data->{IMPORTS}}) {
	98	print DEF "IMPORTS\n";
875fa795	99	my ($name, $exp);
	100	while (($name, $exp)= each %{$data->{IMPORTS}}) {
	101	print DEF " $name=$exp\n";
	102	}
c2e89b3d	103	}
c07a80fd	104	close DEF;
	105	}
	106
68dc0745	107	sub _write_win32 {
	108	my($data) = @_;
	109
3e3baf6d	110	require Config;
68dc0745	111	if (not $data->{DLBASE}) {
	112	($data->{DLBASE} = $data->{NAME}) =~ s/.*:://;
	113	$data->{DLBASE} = substr($data->{DLBASE},0,7) . '_';
	114	}
	115	rename "$data->{FILE}.def", "$data->{FILE}_def.old";
	116
	117	open(DEF,">$data->{FILE}.def")
	118	or croak("Can't create $data->{FILE}.def: $!\n");
84902520	119	# put library name in quotes (it could be a keyword, like 'Alias')
5b0d9cbe	120	if ($Config::Config{'cc'} !~ /^gcc/i) {
5b0d9cbe	121	print DEF "LIBRARY \"$data->{DLBASE}\"\n";
5b0d9cbe	122	}
68dc0745	123	print DEF "EXPORTS\n ";
84902520	124	my @syms;
	125	# Export public symbols both with and without underscores to
	126	# ensure compatibility between DLLs from different compilers
	127	# NOTE: DynaLoader itself only uses the names without underscores,
	128	# so this is only to cover the case when the extension DLL may be
	129	# linked to directly from C. GSAR 97-07-10
3e3baf6d	130	if ($Config::Config{'cc'} =~ /^bcc/i) {
84902520	131	for (@{$data->{DL_VARS}}, @{$data->{FUNCLIST}}) {
	132	push @syms, "_$_", "$_ = _$_";
	133	}
3e3baf6d	134	}
84902520	135	else {
	136	for (@{$data->{DL_VARS}}, @{$data->{FUNCLIST}}) {
	137	push @syms, "$_", "_$_ = $_";
	138	}
	139	}
	140	print DEF join("\n ",@syms, "\n") if @syms;
68dc0745	141	if (%{$data->{IMPORTS}}) {
	142	print DEF "IMPORTS\n";
	143	my ($name, $exp);
	144	while (($name, $exp)= each %{$data->{IMPORTS}}) {
	145	print DEF " $name=$exp\n";
	146	}
	147	}
	148	close DEF;
	149	}
	150
c07a80fd	151
	152	sub _write_vms {
	153	my($data) = @_;
a6e61155	154
f1387719	155	require Config; # a reminder for once we do $^O
ff0cee69	156	require ExtUtils::XSSymSet;
a6e61155	157
a6e61155	158	my($isvax) = $Config::Config{'arch'} =~ /VAX/i;
ff0cee69	159	my($set) = new ExtUtils::XSSymSet;
c07a80fd	160	my($sym);
	161
	162	rename "$data->{FILE}.opt", "$data->{FILE}.opt_old";
	163
	164	open(OPT,">$data->{FILE}.opt")
	165	or croak("Can't create $data->{FILE}.opt: $!\n");
	166
	167	# Options file declaring universal symbols
	168	# Used when linking shareable image for dynamic extension,
	169	# or when linking PerlShr into which we've added this package
	170	# as a static extension
	171	# We don't do anything to preserve order, so we won't relax
	172	# the GSMATCH criteria for a dynamic extension
	173
	174	foreach $sym (@{$data->{FUNCLIST}}) {
ff0cee69	175	my $safe = $set->addsym($sym);
	176	if ($isvax) { print OPT "UNIVERSAL=$safe\n" }
	177	else { print OPT "SYMBOL_VECTOR=($safe=PROCEDURE)\n"; }
c07a80fd	178	}
c07a80fd	179	foreach $sym (@{$data->{DL_VARS}}) {
ff0cee69	180	my $safe = $set->addsym($sym);
c07a80fd	181	print OPT "PSECT_ATTR=${sym},PIC,OVR,RD,NOEXE,WRT,NOSHR\n";
ff0cee69	182	if ($isvax) { print OPT "UNIVERSAL=$safe\n" }
ff0cee69	183	else { print OPT "SYMBOL_VECTOR=($safe=DATA)\n"; }
c07a80fd	184	}
	185	close OPT;
	186
c07a80fd	187	}
	188
	189	1;
	190
	191	__END__
	192
	193	=head1 NAME
	194
	195	ExtUtils::Mksymlists - write linker options files for dynamic extension
	196
	197	=head1 SYNOPSIS
	198
	199	use ExtUtils::Mksymlists;
	200	Mksymlists({ NAME => $name ,
	201	DL_VARS => [ $var1, $var2, $var3 ],
	202	DL_FUNCS => { $pkg1 => [ $func1, $func2 ],
	203	$pkg2 => [ $func3 ] });
	204
	205	=head1 DESCRIPTION
	206
	207	C<ExtUtils::Mksymlists> produces files used by the linker under some OSs
1fef88e7	208	during the creation of shared libraries for dynamic extensions. It is
c07a80fd	209	normally called from a MakeMaker-generated Makefile when the extension
	210	is built. The linker option file is generated by calling the function
	211	C<Mksymlists>, which is exported by default from C<ExtUtils::Mksymlists>.
	212	It takes one argument, a list of key-value pairs, in which the following
	213	keys are recognized:
	214
2ae324a7	215	=over
2ae324a7	216
875fa795	217	=item DLBASE
c07a80fd	218
875fa795	219	This item specifies the name by which the linker knows the
	220	extension, which may be different from the name of the
	221	extension itself (for instance, some linkers add an '_' to the
	222	name of the extension). If it is not specified, it is derived
	223	from the NAME attribute. It is presently used only by OS2 and Win32.
c07a80fd	224
	225	=item DL_FUNCS
	226
	227	This is identical to the DL_FUNCS attribute available via MakeMaker,
	228	from which it is usually taken. Its value is a reference to an
	229	associative array, in which each key is the name of a package, and
	230	each value is an a reference to an array of function names which
	231	should be exported by the extension. For instance, one might say
875fa795	232	C<DL_FUNCS =E<gt> { Homer::Iliad =E<gt> [ qw(trojans greeks) ],
a5f75d66	233	Homer::Odyssey =E<gt> [ qw(travellers family suitors) ] }>. The
c07a80fd	234	function names should be identical to those in the XSUB code;
	235	C<Mksymlists> will alter the names written to the linker option
	236	file to match the changes made by F<xsubpp>. In addition, if
	237	none of the functions in a list begin with the string B<boot_>,
	238	C<Mksymlists> will add a bootstrap function for that package,
	239	just as xsubpp does. (If a B<boot_E<lt>pkgE<gt>> function is
	240	present in the list, it is passed through unchanged.) If
	241	DL_FUNCS is not specified, it defaults to the bootstrap
	242	function for the extension specified in NAME.
	243
	244	=item DL_VARS
	245
	246	This is identical to the DL_VARS attribute available via MakeMaker,
	247	and, like DL_FUNCS, it is usually specified via MakeMaker. Its
	248	value is a reference to an array of variable names which should
	249	be exported by the extension.
	250
	251	=item FILE
	252
	253	This key can be used to specify the name of the linker option file
	254	(minus the OS-specific extension), if for some reason you do not
	255	want to use the default value, which is the last word of the NAME
875fa795	256	attribute (I<e.g.> for C<Tk::Canvas>, FILE defaults to C<Canvas>).
c07a80fd	257
	258	=item FUNCLIST
	259
	260	This provides an alternate means to specify function names to be
	261	exported from the extension. Its value is a reference to an
	262	array of function names to be exported by the extension. These
	263	names are passed through unaltered to the linker options file.
de592821	264	Specifying a value for the FUNCLIST attribute suppresses automatic
875fa795	265	generation of the bootstrap function for the package. To still create
	266	the bootstrap name you have to specify the package name in the
	267	DL_FUNCS hash:
c07a80fd	268
875fa795	269	Mksymlists({ NAME => $name ,
	270	FUNCLIST => [ $func1, $func2 ],
	271	DL_FUNCS => { $pkg => [] } });
c07a80fd	272
875fa795	273
	274	=item IMPORTS
	275
	276	This attribute is used to specify names to be imported into the
	277	extension. It is currently only used by OS/2 and Win32.
	278
	279	=item NAME
	280
	281	This gives the name of the extension (I<e.g.> C<Tk::Canvas>) for which
	282	the linker option file will be produced.
c07a80fd	283
2ae324a7	284	=back
2ae324a7	285
c07a80fd	286	When calling C<Mksymlists>, one should always specify the NAME
	287	attribute. In most cases, this is all that's necessary. In
	288	the case of unusual extensions, however, the other attributes
	289	can be used to provide additional information to the linker.
	290
	291	=head1 AUTHOR
	292
bd3fa61c	293	Charles Bailey I<E<lt>bailey@newman.upenn.eduE<gt>>
c07a80fd	294
	295	=head1 REVISION
	296
a5f75d66	297	Last revised 14-Feb-1996, for Perl 5.002.