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

package ExtUtils::Mksymlists;

use 5.005_64;
use strict qw[ subs refs ];
# no strict 'vars';  # until filehandles are exempted

use Carp;
use Exporter;
our(@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 $comment = "Perl (v$Config::Config{version}$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) = $Config::Config{'archname'} =~ /VAX/i;
    my($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

    print OPT "case_sensitive=yes\n"
        if $Config::Config{d_vms_case_sensitive_symbols};
    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;
cb50131a	2
cb50131a	3	use 5.005_64;
c07a80fd	4	use strict qw[ subs refs ];
	5	# no strict 'vars'; # until filehandles are exempted
	6
	7	use Carp;
c07a80fd	8	use Exporter;
cb50131a	9	our(@ISA, @EXPORT, $VERSION);
f1387719	10	@ISA = 'Exporter';
f1387719	11	@EXPORT = '&Mksymlists';
6ee623d5	12	$VERSION = substr q$Revision: 1.17 $, 10;
c07a80fd	13
	14	sub Mksymlists {
	15	my(%spec) = @_;
f1387719	16	my($osname) = $^O;
c07a80fd	17
	18	croak("Insufficient information specified to Mksymlists")
	19	unless ( $spec{NAME} or
	20	($spec{FILE} and ($spec{DL_FUNCS} or $spec{FUNCLIST})) );
	21
	22	$spec{DL_VARS} = [] unless $spec{DL_VARS};
	23	($spec{FILE} = $spec{NAME}) =~ s/.*::// unless $spec{FILE};
348844dc	24	$spec{FUNCLIST} = [] unless $spec{FUNCLIST};
c07a80fd	25	$spec{DL_FUNCS} = { $spec{NAME} => [] }
c07a80fd	26	unless ( ($spec{DL_FUNCS} and keys %{$spec{DL_FUNCS}}) or
348844dc	27	@{$spec{FUNCLIST}});
c07a80fd	28	if (defined $spec{DL_FUNCS}) {
	29	my($package);
	30	foreach $package (keys %{$spec{DL_FUNCS}}) {
	31	my($packprefix,$sym,$bootseen);
	32	($packprefix = $package) =~ s/\W/_/g;
	33	foreach $sym (@{$spec{DL_FUNCS}->{$package}}) {
	34	if ($sym =~ /^boot_/) {
	35	push(@{$spec{FUNCLIST}},$sym);
	36	$bootseen++;
	37	}
	38	else { push(@{$spec{FUNCLIST}},"XS_${packprefix}_$sym"); }
	39	}
	40	push(@{$spec{FUNCLIST}},"boot_$packprefix") unless $bootseen;
	41	}
	42	}
	43
	44	# We'll need this if we ever add any OS which uses mod2fname
760ac839	45	# not as pseudo-builtin.
c07a80fd	46	# require DynaLoader;
c2e89b3d	47	if (defined &DynaLoader::mod2fname and not $spec{DLBASE}) {
	48	$spec{DLBASE} = DynaLoader::mod2fname([ split(/::/,$spec{NAME}) ]);
	49	}
c07a80fd	50
f1387719	51	if ($osname eq 'aix') { _write_aix(\%spec); }
f1387719	52	elsif ($osname eq 'VMS') { _write_vms(\%spec) }
bab2b58e	53	elsif ($osname eq 'os2') { _write_os2(\%spec) }
68dc0745	54	elsif ($osname eq 'MSWin32') { _write_win32(\%spec) }
f1387719	55	else { croak("Don't know how to create linker option file for $osname\n"); }
c07a80fd	56	}
	57
	58
	59	sub _write_aix {
	60	my($data) = @_;
	61
	62	rename "$data->{FILE}.exp", "$data->{FILE}.exp_old";
	63
	64	open(EXP,">$data->{FILE}.exp")
	65	or croak("Can't create $data->{FILE}.exp: $!\n");
	66	print EXP join("\n",@{$data->{DL_VARS}}, "\n") if @{$data->{DL_VARS}};
	67	print EXP join("\n",@{$data->{FUNCLIST}}, "\n") if @{$data->{FUNCLIST}};
	68	close EXP;
	69	}
	70
	71
	72	sub _write_os2 {
	73	my($data) = @_;
6ee623d5	74	require Config;
6ee623d5	75	my $threaded = ($Config::Config{archname} =~ /-thread/ ? " threaded" : "");
c07a80fd	76
	77	if (not $data->{DLBASE}) {
	78	($data->{DLBASE} = $data->{NAME}) =~ s/.*:://;
	79	$data->{DLBASE} = substr($data->{DLBASE},0,7) . '_';
	80	}
3cfae81b	81	my $distname = $data->{DISTNAME} \|\| $data->{NAME};
3cfae81b	82	$distname = "Distribution $distname";
146174a9	83	my $comment = "Perl (v$Config::Config{version}$threaded) module $data->{NAME}";
3cfae81b	84	if ($data->{INSTALLDIRS} and $data->{INSTALLDIRS} eq 'perl') {
	85	$distname = 'perl5-porters@perl.org';
	86	$comment = "Core $comment";
	87	}
c07a80fd	88	rename "$data->{FILE}.def", "$data->{FILE}_def.old";
	89
	90	open(DEF,">$data->{FILE}.def")
	91	or croak("Can't create $data->{FILE}.def: $!\n");
	92	print DEF "LIBRARY '$data->{DLBASE}' INITINSTANCE TERMINSTANCE\n";
3cfae81b	93	print DEF "DESCRIPTION '\@#$distname:$data->{VERSION}#\@ $comment'\n";
c07a80fd	94	print DEF "CODE LOADONCALL\n";
c07a80fd	95	print DEF "DATA LOADONCALL NONSHARED MULTIPLE\n";
c2e89b3d	96	print DEF "EXPORTS\n ";
	97	print DEF join("\n ",@{$data->{DL_VARS}}, "\n") if @{$data->{DL_VARS}};
	98	print DEF join("\n ",@{$data->{FUNCLIST}}, "\n") if @{$data->{FUNCLIST}};
	99	if (%{$data->{IMPORTS}}) {
	100	print DEF "IMPORTS\n";
875fa795	101	my ($name, $exp);
	102	while (($name, $exp)= each %{$data->{IMPORTS}}) {
	103	print DEF " $name=$exp\n";
	104	}
c2e89b3d	105	}
c07a80fd	106	close DEF;
	107	}
	108
68dc0745	109	sub _write_win32 {
	110	my($data) = @_;
	111
3e3baf6d	112	require Config;
68dc0745	113	if (not $data->{DLBASE}) {
	114	($data->{DLBASE} = $data->{NAME}) =~ s/.*:://;
	115	$data->{DLBASE} = substr($data->{DLBASE},0,7) . '_';
	116	}
	117	rename "$data->{FILE}.def", "$data->{FILE}_def.old";
	118
	119	open(DEF,">$data->{FILE}.def")
	120	or croak("Can't create $data->{FILE}.def: $!\n");
84902520	121	# put library name in quotes (it could be a keyword, like 'Alias')
5b0d9cbe	122	if ($Config::Config{'cc'} !~ /^gcc/i) {
5b0d9cbe	123	print DEF "LIBRARY \"$data->{DLBASE}\"\n";
5b0d9cbe	124	}
68dc0745	125	print DEF "EXPORTS\n ";
84902520	126	my @syms;
	127	# Export public symbols both with and without underscores to
	128	# ensure compatibility between DLLs from different compilers
	129	# NOTE: DynaLoader itself only uses the names without underscores,
	130	# so this is only to cover the case when the extension DLL may be
	131	# linked to directly from C. GSAR 97-07-10
3e3baf6d	132	if ($Config::Config{'cc'} =~ /^bcc/i) {
84902520	133	for (@{$data->{DL_VARS}}, @{$data->{FUNCLIST}}) {
	134	push @syms, "_$_", "$_ = _$_";
	135	}
3e3baf6d	136	}
84902520	137	else {
	138	for (@{$data->{DL_VARS}}, @{$data->{FUNCLIST}}) {
	139	push @syms, "$_", "_$_ = $_";
	140	}
	141	}
	142	print DEF join("\n ",@syms, "\n") if @syms;
68dc0745	143	if (%{$data->{IMPORTS}}) {
	144	print DEF "IMPORTS\n";
	145	my ($name, $exp);
	146	while (($name, $exp)= each %{$data->{IMPORTS}}) {
	147	print DEF " $name=$exp\n";
	148	}
	149	}
	150	close DEF;
	151	}
	152
c07a80fd	153
	154	sub _write_vms {
	155	my($data) = @_;
a6e61155	156
f1387719	157	require Config; # a reminder for once we do $^O
ff0cee69	158	require ExtUtils::XSSymSet;
a6e61155	159
8c99d73e	160	my($isvax) = $Config::Config{'archname'} =~ /VAX/i;
ff0cee69	161	my($set) = new ExtUtils::XSSymSet;
c07a80fd	162	my($sym);
	163
	164	rename "$data->{FILE}.opt", "$data->{FILE}.opt_old";
	165
	166	open(OPT,">$data->{FILE}.opt")
	167	or croak("Can't create $data->{FILE}.opt: $!\n");
	168
	169	# Options file declaring universal symbols
	170	# Used when linking shareable image for dynamic extension,
	171	# or when linking PerlShr into which we've added this package
	172	# as a static extension
	173	# We don't do anything to preserve order, so we won't relax
	174	# the GSMATCH criteria for a dynamic extension
	175
80601f72	176	print OPT "case_sensitive=yes\n"
80601f72	177	if $Config::Config{d_vms_case_sensitive_symbols};
c07a80fd	178	foreach $sym (@{$data->{FUNCLIST}}) {
ff0cee69	179	my $safe = $set->addsym($sym);
	180	if ($isvax) { print OPT "UNIVERSAL=$safe\n" }
	181	else { print OPT "SYMBOL_VECTOR=($safe=PROCEDURE)\n"; }
c07a80fd	182	}
c07a80fd	183	foreach $sym (@{$data->{DL_VARS}}) {
ff0cee69	184	my $safe = $set->addsym($sym);
c07a80fd	185	print OPT "PSECT_ATTR=${sym},PIC,OVR,RD,NOEXE,WRT,NOSHR\n";
ff0cee69	186	if ($isvax) { print OPT "UNIVERSAL=$safe\n" }
ff0cee69	187	else { print OPT "SYMBOL_VECTOR=($safe=DATA)\n"; }
c07a80fd	188	}
	189	close OPT;
	190
c07a80fd	191	}
	192
	193	1;
	194
	195	__END__
	196
	197	=head1 NAME
	198
	199	ExtUtils::Mksymlists - write linker options files for dynamic extension
	200
	201	=head1 SYNOPSIS
	202
	203	use ExtUtils::Mksymlists;
	204	Mksymlists({ NAME => $name ,
	205	DL_VARS => [ $var1, $var2, $var3 ],
	206	DL_FUNCS => { $pkg1 => [ $func1, $func2 ],
	207	$pkg2 => [ $func3 ] });
	208
	209	=head1 DESCRIPTION
	210
	211	C<ExtUtils::Mksymlists> produces files used by the linker under some OSs
1fef88e7	212	during the creation of shared libraries for dynamic extensions. It is
c07a80fd	213	normally called from a MakeMaker-generated Makefile when the extension
	214	is built. The linker option file is generated by calling the function
	215	C<Mksymlists>, which is exported by default from C<ExtUtils::Mksymlists>.
	216	It takes one argument, a list of key-value pairs, in which the following
	217	keys are recognized:
	218
2ae324a7	219	=over
2ae324a7	220
875fa795	221	=item DLBASE
c07a80fd	222
875fa795	223	This item specifies the name by which the linker knows the
	224	extension, which may be different from the name of the
	225	extension itself (for instance, some linkers add an '_' to the
	226	name of the extension). If it is not specified, it is derived
	227	from the NAME attribute. It is presently used only by OS2 and Win32.
c07a80fd	228
	229	=item DL_FUNCS
	230
	231	This is identical to the DL_FUNCS attribute available via MakeMaker,
	232	from which it is usually taken. Its value is a reference to an
	233	associative array, in which each key is the name of a package, and
	234	each value is an a reference to an array of function names which
	235	should be exported by the extension. For instance, one might say
875fa795	236	C<DL_FUNCS =E<gt> { Homer::Iliad =E<gt> [ qw(trojans greeks) ],
a5f75d66	237	Homer::Odyssey =E<gt> [ qw(travellers family suitors) ] }>. The
c07a80fd	238	function names should be identical to those in the XSUB code;
	239	C<Mksymlists> will alter the names written to the linker option
	240	file to match the changes made by F<xsubpp>. In addition, if
	241	none of the functions in a list begin with the string B<boot_>,
	242	C<Mksymlists> will add a bootstrap function for that package,
	243	just as xsubpp does. (If a B<boot_E<lt>pkgE<gt>> function is
	244	present in the list, it is passed through unchanged.) If
	245	DL_FUNCS is not specified, it defaults to the bootstrap
	246	function for the extension specified in NAME.
	247
	248	=item DL_VARS
	249
	250	This is identical to the DL_VARS attribute available via MakeMaker,
	251	and, like DL_FUNCS, it is usually specified via MakeMaker. Its
	252	value is a reference to an array of variable names which should
	253	be exported by the extension.
	254
	255	=item FILE
	256
	257	This key can be used to specify the name of the linker option file
	258	(minus the OS-specific extension), if for some reason you do not
	259	want to use the default value, which is the last word of the NAME
875fa795	260	attribute (I<e.g.> for C<Tk::Canvas>, FILE defaults to C<Canvas>).
c07a80fd	261
	262	=item FUNCLIST
	263
	264	This provides an alternate means to specify function names to be
	265	exported from the extension. Its value is a reference to an
	266	array of function names to be exported by the extension. These
	267	names are passed through unaltered to the linker options file.
de592821	268	Specifying a value for the FUNCLIST attribute suppresses automatic
875fa795	269	generation of the bootstrap function for the package. To still create
	270	the bootstrap name you have to specify the package name in the
	271	DL_FUNCS hash:
c07a80fd	272
875fa795	273	Mksymlists({ NAME => $name ,
	274	FUNCLIST => [ $func1, $func2 ],
	275	DL_FUNCS => { $pkg => [] } });
c07a80fd	276
875fa795	277
	278	=item IMPORTS
	279
	280	This attribute is used to specify names to be imported into the
	281	extension. It is currently only used by OS/2 and Win32.
	282
	283	=item NAME
	284
	285	This gives the name of the extension (I<e.g.> C<Tk::Canvas>) for which
	286	the linker option file will be produced.
c07a80fd	287
2ae324a7	288	=back
2ae324a7	289
c07a80fd	290	When calling C<Mksymlists>, one should always specify the NAME
	291	attribute. In most cases, this is all that's necessary. In
	292	the case of unusual extensions, however, the other attributes
	293	can be used to provide additional information to the linker.
	294
	295	=head1 AUTHOR
	296
bd3fa61c	297	Charles Bailey I<E<lt>bailey@newman.upenn.eduE<gt>>
c07a80fd	298
	299	=head1 REVISION
	300
a5f75d66	301	Last revised 14-Feb-1996, for Perl 5.002.