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

package ExtUtils::Liblist;
use vars qw($VERSION);
# Broken out of MakeMaker from version 4.11

$VERSION = substr q$Revision: 1.21 $, 10;

use Config;
use Cwd 'cwd';
use File::Basename;

sub ext {
  if   ($^O eq 'VMS') { return &_vms_ext;      }
  else                { return &_unix_os2_ext; }
}

sub _unix_os2_ext {
    my($self,$potential_libs, $Verbose) = @_;
    if ($^O =~ 'os2' and $Config{libs}) { 
	# Dynamic libraries are not transitive, so we may need including
	# the libraries linked against perl.dll again.

	$potential_libs .= " " if $potential_libs;
	$potential_libs .= $Config{libs};
    }
    return ("", "", "", "") unless $potential_libs;
    print STDOUT "Potential libraries are '$potential_libs':\n" if $Verbose;

    my($so)   = $Config{'so'};
    my($libs) = $Config{'libs'};
    my $Config_libext = $Config{lib_ext} || ".a";


    # compute $extralibs, $bsloadlibs and $ldloadlibs from
    # $potential_libs
    # this is a rewrite of Andy Dougherty's extliblist in perl
    # its home is in <distribution>/ext/util

    my(@searchpath); # from "-L/path" entries in $potential_libs
    my(@libpath) = split " ", $Config{'libpth'};
    my(@ldloadlibs, @bsloadlibs, @extralibs, @ld_run_path, %ld_run_path_seen);
    my($fullname, $thislib, $thispth, @fullname);
    my($pwd) = cwd(); # from Cwd.pm
    my($found) = 0;

    foreach $thislib (split ' ', $potential_libs){

	# Handle possible linker path arguments.
	if ($thislib =~ s/^(-[LR])//){	# save path flag type
	    my($ptype) = $1;
	    unless (-d $thislib){
		print STDOUT "$ptype$thislib ignored, directory does not exist\n"
			if $Verbose;
		next;
	    }
	    unless ($self->file_name_is_absolute($thislib)) {
	      print STDOUT "Warning: $ptype$thislib changed to $ptype$pwd/$thislib\n";
	      $thislib = $self->catdir($pwd,$thislib);
	    }
	    push(@searchpath, $thislib);
	    push(@extralibs,  "$ptype$thislib");
	    push(@ldloadlibs, "$ptype$thislib");
	    next;
	}

	# Handle possible library arguments.
	unless ($thislib =~ s/^-l//){
	  print STDOUT "Unrecognized argument in LIBS ignored: '$thislib'\n";
	  next;
	}

	my($found_lib)=0;
	foreach $thispth (@searchpath, @libpath){

		# Try to find the full name of the library.  We need this to
		# determine whether it's a dynamically-loadable library or not.
		# This tends to be subject to various os-specific quirks.
		# For gcc-2.6.2 on linux (March 1995), DLD can not load
		# .sa libraries, with the exception of libm.sa, so we
		# deliberately skip them.
	    if (@fullname = $self->lsdir($thispth,"^lib$thislib\.$so\.[0-9]+")){
		# Take care that libfoo.so.10 wins against libfoo.so.9.
		# Compare two libraries to find the most recent version
		# number.  E.g.  if you have libfoo.so.9.0.7 and
		# libfoo.so.10.1, first convert all digits into two
		# decimal places.  Then we'll add ".00" to the shorter
		# strings so that we're comparing strings of equal length
		# Thus we'll compare libfoo.so.09.07.00 with
		# libfoo.so.10.01.00.  Some libraries might have letters
		# in the version.  We don't know what they mean, but will
		# try to skip them gracefully -- we'll set any letter to
		# '0'.  Finally, sort in reverse so we can take the
		# first element.

		#TODO: iterate through the directory instead of sorting

		$fullname = "$thispth/" .
		(sort { my($ma) = $a;
			my($mb) = $b;
			$ma =~ tr/A-Za-z/0/s;
			$ma =~ s/\b(\d)\b/0$1/g;
			$mb =~ tr/A-Za-z/0/s;
			$mb =~ s/\b(\d)\b/0$1/g;
			while (length($ma) < length($mb)) { $ma .= ".00"; }
			while (length($mb) < length($ma)) { $mb .= ".00"; }
			# Comparison deliberately backwards
			$mb cmp $ma;} @fullname)[0];
	    } elsif (-f ($fullname="$thispth/lib$thislib.$so")
		 && (($Config{'dlsrc'} ne "dl_dld.xs") || ($thislib eq "m"))){
	    } elsif (-f ($fullname="$thispth/lib${thislib}_s$Config_libext")
		 && ($thislib .= "_s") ){ # we must explicitly use _s version
	    } elsif (-f ($fullname="$thispth/lib$thislib$Config_libext")){
	    } elsif (-f ($fullname="$thispth/$thislib$Config_libext")){
	    } elsif (-f ($fullname="$thispth/Slib$thislib$Config_libext")){
	    } elsif ($^O eq 'dgux'
		 && -l ($fullname="$thispth/lib$thislib$Config_libext")
		 && readlink($fullname) =~ /^elink:/) {
		 # Some of DG's libraries look like misconnected symbolic
		 # links, but development tools can follow them.  (They
		 # look like this:
		 #
		 #    libm.a -> elink:${SDE_PATH:-/usr}/sde/\
		 #    ${TARGET_BINARY_INTERFACE:-m88kdgux}/usr/lib/libm.a
		 #
		 # , the compilation tools expand the environment variables.)
	    } else {
		print STDOUT "$thislib not found in $thispth\n" if $Verbose;
		next;
	    }
	    print STDOUT "'-l$thislib' found at $fullname\n" if $Verbose;
	    my($fullnamedir) = dirname($fullname);
	    push @ld_run_path, $fullnamedir unless $ld_run_path_seen{$fullnamedir}++;
	    $found++;
	    $found_lib++;

	    # Now update library lists

	    # what do we know about this library...
	    my $is_dyna = ($fullname !~ /\Q$Config_libext\E$/);
	    my $in_perl = ($libs =~ /\B-l\Q$ {thislib}\E\b/s);

	    # Do not add it into the list if it is already linked in
	    # with the main perl executable.
	    # We have to special-case the NeXT, because math and ndbm 
	    # are both in libsys_s
	    unless ($in_perl || 
		($Config{'osname'} eq 'next' &&
		    ($thislib eq 'm' || $thislib eq 'ndbm')) ){
		push(@extralibs, "-l$thislib");
	    }

	    # We might be able to load this archive file dynamically
	    if ( ($Config{'dlsrc'} =~ /dl_next/ && $Config{'osvers'} lt '4_0')
	    ||   ($Config{'dlsrc'} =~ /dl_dld/) )
	    {
		# We push -l$thislib instead of $fullname because
		# it avoids hardwiring a fixed path into the .bs file.
		# Mkbootstrap will automatically add dl_findfile() to
		# the .bs file if it sees a name in the -l format.
		# USE THIS, when dl_findfile() is fixed: 
		# push(@bsloadlibs, "-l$thislib");
		# OLD USE WAS while checking results against old_extliblist
		push(@bsloadlibs, "$fullname");
	    } else {
		if ($is_dyna){
                    # For SunOS4, do not add in this shared library if
                    # it is already linked in the main perl executable
		    push(@ldloadlibs, "-l$thislib")
			unless ($in_perl and $^O eq 'sunos');
		} else {
		    push(@ldloadlibs, "-l$thislib");
		}
	    }
	    last;	# found one here so don't bother looking further
	}
	print STDOUT "Warning (will try anyway): No library found for -l$thislib\n"
	    unless $found_lib>0;
    }
    return ('','','','') unless $found;
    ("@extralibs", "@bsloadlibs", "@ldloadlibs",join(":",@ld_run_path));
}


sub _vms_ext {
  my($self, $potential_libs,$verbose) = @_;
  return ('', '', '', '') unless $potential_libs;

  my(@dirs,@libs,$dir,$lib,%sh,%olb,%obj);
  my $cwd = cwd();
  my($so,$lib_ext,$obj_ext) = @Config{'so','lib_ext','obj_ext'};
  # List of common Unix library names and there VMS equivalents
  # (VMS equivalent of '' indicates that the library is automatially
  # searched by the linker, and should be skipped here.)
  my %libmap = ( 'm' => '', 'f77' => '', 'F77' => '', 'V77' => '', 'c' => '',
                 'malloc' => '', 'crypt' => '', 'resolv' => '', 'c_s' => '',
                 'socket' => '', 'X11' => 'DECW$XLIBSHR',
                 'Xt' => 'DECW$XTSHR', 'Xm' => 'DECW$XMLIBSHR',
                 'Xmu' => 'DECW$XMULIBSHR');
  if ($Config{'vms_cc_type'} ne 'decc') { $libmap{'curses'} = 'VAXCCURSE'; }

  print STDOUT "Potential libraries are '$potential_libs'\n" if $verbose;

  # First, sort out directories and library names in the input
  foreach $lib (split ' ',$potential_libs) {
    push(@dirs,$1),   next if $lib =~ /^-L(.*)/;
    push(@dirs,$lib), next if $lib =~ /[:>\]]$/;
    push(@dirs,$lib), next if -d $lib;
    push(@libs,$1),   next if $lib =~ /^-l(.*)/;
    push(@libs,$lib);
  }
  push(@dirs,split(' ',$Config{'libpth'}));

  # Now make sure we've got VMS-syntax absolute directory specs
  # (We don't, however, check whether someone's hidden a relative
  # path in a logical name.)
  foreach $dir (@dirs) {
    unless (-d $dir) {
      print STDOUT "Skipping nonexistent Directory $dir\n" if $verbose > 1;
      $dir = '';
      next;
    }
    print STDOUT "Resolving directory $dir\n" if $verbose;
    if ($self->file_name_is_absolute($dir)) { $dir = $self->fixpath($dir,1); }
    else                                    { $dir = $self->catdir($cwd,$dir); }
  }
  @dirs = grep { length($_) } @dirs;
  unshift(@dirs,''); # Check each $lib without additions first

  LIB: foreach $lib (@libs) {
    if (exists $libmap{$lib}) {
      next unless length $libmap{$lib};
      $lib = $libmap{$lib};
    }

    my(@variants,$variant,$name,$test,$cand);
    my($ctype) = '';

    # If we don't have a file type, consider it a possibly abbreviated name and
    # check for common variants.  We try these first to grab libraries before
    # a like-named executable image (e.g. -lperl resolves to perlshr.exe
    # before perl.exe).
    if ($lib !~ /\.[^:>\]]*$/) {
      push(@variants,"${lib}shr","${lib}rtl","${lib}lib");
      push(@variants,"lib$lib") if $lib !~ /[:>\]]/;
    }
    push(@variants,$lib);
    print STDOUT "Looking for $lib\n" if $verbose;
    foreach $variant (@variants) {
      foreach $dir (@dirs) {
        my($type);

        $name = "$dir$variant";
        print "\tChecking $name\n" if $verbose > 2;
        if (-f ($test = VMS::Filespec::rmsexpand($name))) {
          # It's got its own suffix, so we'll have to figure out the type
          if    ($test =~ /(?:$so|exe)$/i)      { $type = 'sh'; }
          elsif ($test =~ /(?:$lib_ext|olb)$/i) { $type = 'olb'; }
          elsif ($test =~ /(?:$obj_ext|obj)$/i) {
            print STDOUT "Warning (will try anyway): Plain object file $test found in library list\n";
            $type = 'obj';
          }
          else {
            print STDOUT "Warning (will try anyway): Unknown library type for $test; assuming shared\n";
            $type = 'sh';
          }
        }
        elsif (-f ($test = VMS::Filespec::rmsexpand($name,$so))      or
               -f ($test = VMS::Filespec::rmsexpand($name,'.exe')))     {
          $type = 'sh';
          $name = $test unless $test =~ /exe;?\d*$/i;
        }
        elsif (not length($ctype) and  # If we've got a lib already, don't bother
               ( -f ($test = VMS::Filespec::rmsexpand($name,$lib_ext)) or
                 -f ($test = VMS::Filespec::rmsexpand($name,'.olb'))))  {
          $type = 'olb';
          $name = $test unless $test =~ /olb;?\d*$/i;
        }
        elsif (not length($ctype) and  # If we've got a lib already, don't bother
               ( -f ($test = VMS::Filespec::rmsexpand($name,$obj_ext)) or
                 -f ($test = VMS::Filespec::rmsexpand($name,'.obj'))))  {
          print STDOUT "Warning (will try anyway): Plain object file $test found in library list\n";
          $type = 'obj';
          $name = $test unless $test =~ /obj;?\d*$/i;
        }
        if (defined $type) {
          $ctype = $type; $cand = $name;
          last if $ctype eq 'sh';
        }
      }
      if ($ctype) { 
        eval '$' . $ctype . "{'$cand'}++";
        die "Error recording library: $@" if $@;
        print STDOUT "\tFound as $name (really $test), type $type\n" if $verbose > 1;
        next LIB;
      }
    }
    print STDOUT "Warning (will try anyway): No library found for $lib\n";
  }

  @libs = sort keys %obj;
  # This has to precede any other CRTLs, so just make it first
  if ($olb{VAXCCURSE}) {
    push(@libs,"$olb{VAXCCURSE}/Library");
    delete $olb{VAXCCURSE};
  }
  push(@libs, map { "$_/Library" } sort keys %olb);
  push(@libs, map { "$_/Share"   } sort keys %sh);
  $lib = join(' ',@libs);
  print "Result: $lib\n" if $verbose;
  wantarray ? ($lib, '', $lib, '') : $lib;
}

1;

__END__

=head1 NAME

ExtUtils::Liblist - determine libraries to use and how to use them

=head1 SYNOPSIS

C<require ExtUtils::Liblist;>

C<ExtUtils::Liblist::ext($potential_libs, $Verbose);>

=head1 DESCRIPTION

This utility takes a list of libraries in the form C<-llib1 -llib2
-llib3> and prints out lines suitable for inclusion in an extension
Makefile.  Extra library paths may be included with the form
C<-L/another/path> this will affect the searches for all subsequent
libraries.

It returns an array of four scalar values: EXTRALIBS, BSLOADLIBS,
LDLOADLIBS, and LD_RUN_PATH.

Dependent libraries can be linked in one of three ways:

=over 2

=item * For static extensions

by the ld command when the perl binary is linked with the extension
library. See EXTRALIBS below.

=item * For dynamic extensions

by the ld command when the shared object is built/linked. See
LDLOADLIBS below.

=item * For dynamic extensions

by the DynaLoader when the shared object is loaded. See BSLOADLIBS
below.

=back

=head2 EXTRALIBS

List of libraries that need to be linked with when linking a perl
binary which includes this extension Only those libraries that
actually exist are included.  These are written to a file and used
when linking perl.

=head2 LDLOADLIBS and LD_RUN_PATH

List of those libraries which can or must be linked into the shared
library when created using ld. These may be static or dynamic
libraries.  LD_RUN_PATH is a colon separated list of the directories
in LDLOADLIBS. It is passed as an environment variable to the process
that links the shared library.

=head2 BSLOADLIBS

List of those libraries that are needed but can be linked in
dynamically at run time on this platform.  SunOS/Solaris does not need
this because ld records the information (from LDLOADLIBS) into the
object file.  This list is used to create a .bs (bootstrap) file.

=head1 PORTABILITY

This module deals with a lot of system dependencies and has quite a
few architecture specific B<if>s in the code.

=head2 VMS implementation

The version of ext() which is executed under VMS differs from the
Unix-OS/2 version in several respects:

=over 2

=item *

Input library and path specifications are accepted with or without the
C<-l> and C<-L> prefices used by Unix linkers.  If neither prefix is
present, a token is considered a directory to search if it is in fact
a directory, and a library to search for otherwise.  Authors who wish
their extensions to be portable to Unix or OS/2 should use the Unix
prefixes, since the Unix-OS/2 version of ext() requires them.

=item *

Wherever possible, shareable images are preferred to object libraries,
and object libraries to plain object files.  In accordance with VMS
naming conventions, ext() looks for files named I<lib>shr and I<lib>rtl;
it also looks for I<lib>lib and libI<lib> to accomodate Unix conventions
used in some ported software.

=item *

For each library that is found, an appropriate directive for a linker options
file is generated.  The return values are space-separated strings of
these directives, rather than elements used on the linker command line.

=item *

LDLOADLIBS and EXTRALIBS are always identical under VMS, and BSLOADLIBS
and LD_RIN_PATH are always empty.

=back

In addition, an attempt is made to recognize several common Unix library
names, and filter them out or convert them to their VMS equivalents, as
appropriate.

In general, the VMS version of ext() should properly handle input from
extensions originally designed for a Unix or VMS environment.  If you
encounter problems, or discover cases where the search could be improved,
please let us know.

=head1 SEE ALSO

L<ExtUtils::MakeMaker>

=cut
Commit	Line	Data
005c1a0e	1	package ExtUtils::Liblist;
8a1da95f	2	use vars qw($VERSION);
005c1a0e	3	# Broken out of MakeMaker from version 4.11
005c1a0e	4
bab2b58e	5	$VERSION = substr q$Revision: 1.21 $, 10;
f1387719	6
005c1a0e	7	use Config;
8f1aa56b	8	use Cwd 'cwd';
4633a7c4	9	use File::Basename;
4633a7c4	10
005c1a0e	11	sub ext {
55497cff	12	if ($^O eq 'VMS') { return &_vms_ext; }
	13	else { return &_unix_os2_ext; }
	14	}
	15
	16	sub _unix_os2_ext {
c2e89b3d	17	my($self,$potential_libs, $Verbose) = @_;
f1387719	18	if ($^O =~ 'os2' and $Config{libs}) {
4e68a208	19	# Dynamic libraries are not transitive, so we may need including
	20	# the libraries linked against perl.dll again.
	21
	22	$potential_libs .= " " if $potential_libs;
	23	$potential_libs .= $Config{libs};
	24	}
4633a7c4	25	return ("", "", "", "") unless $potential_libs;
8e07c86e	26	print STDOUT "Potential libraries are '$potential_libs':\n" if $Verbose;
005c1a0e	27
	28	my($so) = $Config{'so'};
	29	my($libs) = $Config{'libs'};
55497cff	30	my $Config_libext = $Config{lib_ext} \|\| ".a";
55497cff	31
005c1a0e	32
	33	# compute $extralibs, $bsloadlibs and $ldloadlibs from
	34	# $potential_libs
	35	# this is a rewrite of Andy Dougherty's extliblist in perl
	36	# its home is in <distribution>/ext/util
	37
	38	my(@searchpath); # from "-L/path" entries in $potential_libs
	39	my(@libpath) = split " ", $Config{'libpth'};
4633a7c4	40	my(@ldloadlibs, @bsloadlibs, @extralibs, @ld_run_path, %ld_run_path_seen);
005c1a0e	41	my($fullname, $thislib, $thispth, @fullname);
8f1aa56b	42	my($pwd) = cwd(); # from Cwd.pm
005c1a0e	43	my($found) = 0;
	44
	45	foreach $thislib (split ' ', $potential_libs){
	46
	47	# Handle possible linker path arguments.
	48	if ($thislib =~ s/^(-[LR])//){ # save path flag type
	49	my($ptype) = $1;
	50	unless (-d $thislib){
	51	print STDOUT "$ptype$thislib ignored, directory does not exist\n"
	52	if $Verbose;
	53	next;
	54	}
f1387719	55	unless ($self->file_name_is_absolute($thislib)) {
005c1a0e	56	print STDOUT "Warning: $ptype$thislib changed to $ptype$pwd/$thislib\n";
f1387719	57	$thislib = $self->catdir($pwd,$thislib);
005c1a0e	58	}
	59	push(@searchpath, $thislib);
	60	push(@extralibs, "$ptype$thislib");
	61	push(@ldloadlibs, "$ptype$thislib");
	62	next;
	63	}
	64
	65	# Handle possible library arguments.
	66	unless ($thislib =~ s/^-l//){
	67	print STDOUT "Unrecognized argument in LIBS ignored: '$thislib'\n";
	68	next;
	69	}
	70
	71	my($found_lib)=0;
	72	foreach $thispth (@searchpath, @libpath){
	73
	74	# Try to find the full name of the library. We need this to
	75	# determine whether it's a dynamically-loadable library or not.
	76	# This tends to be subject to various os-specific quirks.
	77	# For gcc-2.6.2 on linux (March 1995), DLD can not load
	78	# .sa libraries, with the exception of libm.sa, so we
	79	# deliberately skip them.
c2e89b3d	80	if (@fullname = $self->lsdir($thispth,"^lib$thislib\.$so\.[0-9]+")){
005c1a0e	81	# Take care that libfoo.so.10 wins against libfoo.so.9.
	82	# Compare two libraries to find the most recent version
	83	# number. E.g. if you have libfoo.so.9.0.7 and
	84	# libfoo.so.10.1, first convert all digits into two
	85	# decimal places. Then we'll add ".00" to the shorter
	86	# strings so that we're comparing strings of equal length
	87	# Thus we'll compare libfoo.so.09.07.00 with
	88	# libfoo.so.10.01.00. Some libraries might have letters
	89	# in the version. We don't know what they mean, but will
	90	# try to skip them gracefully -- we'll set any letter to
	91	# '0'. Finally, sort in reverse so we can take the
	92	# first element.
	93
	94	#TODO: iterate through the directory instead of sorting
	95
	96	$fullname = "$thispth/" .
	97	(sort { my($ma) = $a;
	98	my($mb) = $b;
	99	$ma =~ tr/A-Za-z/0/s;
	100	$ma =~ s/\b(\d)\b/0$1/g;
	101	$mb =~ tr/A-Za-z/0/s;
	102	$mb =~ s/\b(\d)\b/0$1/g;
	103	while (length($ma) < length($mb)) { $ma .= ".00"; }
	104	while (length($mb) < length($ma)) { $mb .= ".00"; }
	105	# Comparison deliberately backwards
	106	$mb cmp $ma;} @fullname)[0];
	107	} elsif (-f ($fullname="$thispth/lib$thislib.$so")
	108	&& (($Config{'dlsrc'} ne "dl_dld.xs") \|\| ($thislib eq "m"))){
4633a7c4	109	} elsif (-f ($fullname="$thispth/lib${thislib}_s$Config_libext")
005c1a0e	110	&& ($thislib .= "_s") ){ # we must explicitly use _s version
4633a7c4	111	} elsif (-f ($fullname="$thispth/lib$thislib$Config_libext")){
864a5fa8	112	} elsif (-f ($fullname="$thispth/$thislib$Config_libext")){
4633a7c4	113	} elsif (-f ($fullname="$thispth/Slib$thislib$Config_libext")){
8f1aa56b	114	} elsif ($^O eq 'dgux'
c07a80fd	115	&& -l ($fullname="$thispth/lib$thislib$Config_libext")
	116	&& readlink($fullname) =~ /^elink:/) {
	117	# Some of DG's libraries look like misconnected symbolic
	118	# links, but development tools can follow them. (They
	119	# look like this:
	120	#
	121	# libm.a -> elink:${SDE_PATH:-/usr}/sde/\
	122	# ${TARGET_BINARY_INTERFACE:-m88kdgux}/usr/lib/libm.a
	123	#
	124	# , the compilation tools expand the environment variables.)
005c1a0e	125	} else {
8e07c86e	126	print STDOUT "$thislib not found in $thispth\n" if $Verbose;
005c1a0e	127	next;
005c1a0e	128	}
8e07c86e	129	print STDOUT "'-l$thislib' found at $fullname\n" if $Verbose;
4633a7c4	130	my($fullnamedir) = dirname($fullname);
4633a7c4	131	push @ld_run_path, $fullnamedir unless $ld_run_path_seen{$fullnamedir}++;
005c1a0e	132	$found++;
	133	$found_lib++;
	134
	135	# Now update library lists
	136
	137	# what do we know about this library...
4633a7c4	138	my $is_dyna = ($fullname !~ /\Q$Config_libext\E$/);
4e68a208	139	my $in_perl = ($libs =~ /\B-l\Q$ {thislib}\E\b/s);
005c1a0e	140
	141	# Do not add it into the list if it is already linked in
	142	# with the main perl executable.
974f612f	143	# We have to special-case the NeXT, because math and ndbm
974f612f	144	# are both in libsys_s
005c1a0e	145	unless ($in_perl \|\|
974f612f	146	($Config{'osname'} eq 'next' &&
974f612f	147	($thislib eq 'm' \|\| $thislib eq 'ndbm')) ){
005c1a0e	148	push(@extralibs, "-l$thislib");
	149	}
	150
	151	# We might be able to load this archive file dynamically
974f612f	152	if ( ($Config{'dlsrc'} =~ /dl_next/ && $Config{'osvers'} lt '4_0')
	153	\|\| ($Config{'dlsrc'} =~ /dl_dld/) )
	154	{
005c1a0e	155	# We push -l$thislib instead of $fullname because
	156	# it avoids hardwiring a fixed path into the .bs file.
	157	# Mkbootstrap will automatically add dl_findfile() to
	158	# the .bs file if it sees a name in the -l format.
	159	# USE THIS, when dl_findfile() is fixed:
	160	# push(@bsloadlibs, "-l$thislib");
	161	# OLD USE WAS while checking results against old_extliblist
	162	push(@bsloadlibs, "$fullname");
	163	} else {
	164	if ($is_dyna){
	165	# For SunOS4, do not add in this shared library if
	166	# it is already linked in the main perl executable
	167	push(@ldloadlibs, "-l$thislib")
8f1aa56b	168	unless ($in_perl and $^O eq 'sunos');
005c1a0e	169	} else {
	170	push(@ldloadlibs, "-l$thislib");
	171	}
	172	}
	173	last; # found one here so don't bother looking further
	174	}
864a5fa8	175	print STDOUT "Warning (will try anyway): No library found for -l$thislib\n"
005c1a0e	176	unless $found_lib>0;
005c1a0e	177	}
4633a7c4	178	return ('','','','') unless $found;
4633a7c4	179	("@extralibs", "@bsloadlibs", "@ldloadlibs",join(":",@ld_run_path));
005c1a0e	180	}
005c1a0e	181
55497cff	182
	183	sub _vms_ext {
	184	my($self, $potential_libs,$verbose) = @_;
	185	return ('', '', '', '') unless $potential_libs;
	186
	187	my(@dirs,@libs,$dir,$lib,%sh,%olb,%obj);
	188	my $cwd = cwd();
	189	my($so,$lib_ext,$obj_ext) = @Config{'so','lib_ext','obj_ext'};
	190	# List of common Unix library names and there VMS equivalents
	191	# (VMS equivalent of '' indicates that the library is automatially
	192	# searched by the linker, and should be skipped here.)
	193	my %libmap = ( 'm' => '', 'f77' => '', 'F77' => '', 'V77' => '', 'c' => '',
	194	'malloc' => '', 'crypt' => '', 'resolv' => '', 'c_s' => '',
	195	'socket' => '', 'X11' => 'DECW$XLIBSHR',
	196	'Xt' => 'DECW$XTSHR', 'Xm' => 'DECW$XMLIBSHR',
	197	'Xmu' => 'DECW$XMULIBSHR');
	198	if ($Config{'vms_cc_type'} ne 'decc') { $libmap{'curses'} = 'VAXCCURSE'; }
	199
	200	print STDOUT "Potential libraries are '$potential_libs'\n" if $verbose;
	201
	202	# First, sort out directories and library names in the input
	203	foreach $lib (split ' ',$potential_libs) {
	204	push(@dirs,$1), next if $lib =~ /^-L(.*)/;
	205	push(@dirs,$lib), next if $lib =~ /[:>\]]$/;
	206	push(@dirs,$lib), next if -d $lib;
	207	push(@libs,$1), next if $lib =~ /^-l(.*)/;
	208	push(@libs,$lib);
	209	}
	210	push(@dirs,split(' ',$Config{'libpth'}));
	211
	212	# Now make sure we've got VMS-syntax absolute directory specs
	213	# (We don't, however, check whether someone's hidden a relative
	214	# path in a logical name.)
	215	foreach $dir (@dirs) {
	216	unless (-d $dir) {
	217	print STDOUT "Skipping nonexistent Directory $dir\n" if $verbose > 1;
	218	$dir = '';
	219	next;
	220	}
	221	print STDOUT "Resolving directory $dir\n" if $verbose;
	222	if ($self->file_name_is_absolute($dir)) { $dir = $self->fixpath($dir,1); }
	223	else { $dir = $self->catdir($cwd,$dir); }
	224	}
	225	@dirs = grep { length($_) } @dirs;
	226	unshift(@dirs,''); # Check each $lib without additions first
	227
	228	LIB: foreach $lib (@libs) {
	229	if (exists $libmap{$lib}) {
	230	next unless length $libmap{$lib};
	231	$lib = $libmap{$lib};
	232	}
	233
	234	my(@variants,$variant,$name,$test,$cand);
	235	my($ctype) = '';
	236
	237	# If we don't have a file type, consider it a possibly abbreviated name and
	238	# check for common variants. We try these first to grab libraries before
	239	# a like-named executable image (e.g. -lperl resolves to perlshr.exe
	240	# before perl.exe).
	241	if ($lib !~ /\.[^:>\]]*$/) {
	242	push(@variants,"${lib}shr","${lib}rtl","${lib}lib");
	243	push(@variants,"lib$lib") if $lib !~ /[:>\]]/;
	244	}
	245	push(@variants,$lib);
246	print STDOUT "Looking for $lib\n" if $verbose;
247	foreach $variant (@variants) {
248	foreach $dir (@dirs) {
249	my($type);
250
251	$name = "$dir$variant";
252	print "\tChecking $name\n" if $verbose > 2;
253	if (-f ($test = VMS::Filespec::rmsexpand($name))) {
254	# It's got its own suffix, so we'll have to figure out the type
255	if ($test =~ /(?:$so\|exe)$/i) { $type = 'sh'; }
256	elsif ($test =~ /(?:$lib_ext\|olb)$/i) { $type = 'olb'; }
257	elsif ($test =~ /(?:$obj_ext\|obj)$/i) {
258	print STDOUT "Warning (will try anyway): Plain object file $test found in library list\n";
259	$type = 'obj';
260	}
261	else {
262	print STDOUT "Warning (will try anyway): Unknown library type for $test; assuming shared\n";
263	$type = 'sh';
264	}
265	}
266	elsif (-f ($test = VMS::Filespec::rmsexpand($name,$so)) or
267	-f ($test = VMS::Filespec::rmsexpand($name,'.exe'))) {
268	$type = 'sh';
269	$name = $test unless $test =~ /exe;?\d*$/i;
270	}
271	elsif (not length($ctype) and # If we've got a lib already, don't bother
272	( -f ($test = VMS::Filespec::rmsexpand($name,$lib_ext)) or
273	-f ($test = VMS::Filespec::rmsexpand($name,'.olb')))) {
274	$type = 'olb';
275	$name = $test unless $test =~ /olb;?\d*$/i;
276	}
277	elsif (not length($ctype) and # If we've got a lib already, don't bother
278	( -f ($test = VMS::Filespec::rmsexpand($name,$obj_ext)) or
279	-f ($test = VMS::Filespec::rmsexpand($name,'.obj')))) {
280	print STDOUT "Warning (will try anyway): Plain object file $test found in library list\n";
281	$type = 'obj';
282	$name = $test unless $test =~ /obj;?\d*$/i;
283	}
284	if (defined $type) {
285	$ctype = $type; $cand = $name;
286	last if $ctype eq 'sh';
287	}
288	}
289	if ($ctype) {
290	eval '$' . $ctype . "{'$cand'}++";
291	die "Error recording library: $@" if $@;
292	print STDOUT "\tFound as $name (really $test), type $type\n" if $verbose > 1;
293	next LIB;
294	}
295	}
296	print STDOUT "Warning (will try anyway): No library found for $lib\n";
297	}
298
299	@libs = sort keys %obj;
300	# This has to precede any other CRTLs, so just make it first
301	if ($olb{VAXCCURSE}) {
302	push(@libs,"$olb{VAXCCURSE}/Library");
303	delete $olb{VAXCCURSE};
304	}
305	push(@libs, map { "$_/Library" } sort keys %olb);
306	push(@libs, map { "$_/Share" } sort keys %sh);
307	$lib = join(' ',@libs);
308	print "Result: $lib\n" if $verbose;
309	wantarray ? ($lib, '', $lib, '') : $lib;
310	}
311
005c1a0e	312	1;
c2e89b3d	313
864a5fa8	314	__END__
cb1a09d0	315
864a5fa8	316	=head1 NAME
	317
	318	ExtUtils::Liblist - determine libraries to use and how to use them
	319
	320	=head1 SYNOPSIS
	321
	322	C<require ExtUtils::Liblist;>
	323
	324	C<ExtUtils::Liblist::ext($potential_libs, $Verbose);>
	325
	326	=head1 DESCRIPTION
	327
	328	This utility takes a list of libraries in the form C<-llib1 -llib2
	329	-llib3> and prints out lines suitable for inclusion in an extension
	330	Makefile. Extra library paths may be included with the form
	331	C<-L/another/path> this will affect the searches for all subsequent
	332	libraries.
	333
	334	It returns an array of four scalar values: EXTRALIBS, BSLOADLIBS,
	335	LDLOADLIBS, and LD_RUN_PATH.
	336
	337	Dependent libraries can be linked in one of three ways:
	338
	339	=over 2
	340
	341	=item * For static extensions
	342
	343	by the ld command when the perl binary is linked with the extension
	344	library. See EXTRALIBS below.
	345
	346	=item * For dynamic extensions
	347
	348	by the ld command when the shared object is built/linked. See
	349	LDLOADLIBS below.
	350
	351	=item * For dynamic extensions
	352
	353	by the DynaLoader when the shared object is loaded. See BSLOADLIBS
	354	below.
	355
	356	=back
	357
	358	=head2 EXTRALIBS
	359
	360	List of libraries that need to be linked with when linking a perl
	361	binary which includes this extension Only those libraries that
	362	actually exist are included. These are written to a file and used
	363	when linking perl.
	364
	365	=head2 LDLOADLIBS and LD_RUN_PATH
	366
	367	List of those libraries which can or must be linked into the shared
	368	library when created using ld. These may be static or dynamic
	369	libraries. LD_RUN_PATH is a colon separated list of the directories
	370	in LDLOADLIBS. It is passed as an environment variable to the process
	371	that links the shared library.
	372
	373	=head2 BSLOADLIBS
	374
	375	List of those libraries that are needed but can be linked in
	376	dynamically at run time on this platform. SunOS/Solaris does not need
	377	this because ld records the information (from LDLOADLIBS) into the
	378	object file. This list is used to create a .bs (bootstrap) file.
	379
380	=head1 PORTABILITY
381
382	This module deals with a lot of system dependencies and has quite a
383	few architecture specific B<if>s in the code.
384
55497cff	385	=head2 VMS implementation
	386
	387	The version of ext() which is executed under VMS differs from the
	388	Unix-OS/2 version in several respects:
	389
	390	=over 2
	391
	392	=item *
	393
	394	Input library and path specifications are accepted with or without the
	395	C<-l> and C<-L> prefices used by Unix linkers. If neither prefix is
	396	present, a token is considered a directory to search if it is in fact
	397	a directory, and a library to search for otherwise. Authors who wish
	398	their extensions to be portable to Unix or OS/2 should use the Unix
	399	prefixes, since the Unix-OS/2 version of ext() requires them.
	400
	401	=item *
	402
	403	Wherever possible, shareable images are preferred to object libraries,
	404	and object libraries to plain object files. In accordance with VMS
	405	naming conventions, ext() looks for files named I<lib>shr and I<lib>rtl;
	406	it also looks for I<lib>lib and libI<lib> to accomodate Unix conventions
	407	used in some ported software.
	408
	409	=item *
	410
	411	For each library that is found, an appropriate directive for a linker options
	412	file is generated. The return values are space-separated strings of
	413	these directives, rather than elements used on the linker command line.
	414
	415	=item *
	416
	417	LDLOADLIBS and EXTRALIBS are always identical under VMS, and BSLOADLIBS
	418	and LD_RIN_PATH are always empty.
	419
	420	=back
	421
	422	In addition, an attempt is made to recognize several common Unix library
	423	names, and filter them out or convert them to their VMS equivalents, as
	424	appropriate.
	425
	426	In general, the VMS version of ext() should properly handle input from
	427	extensions originally designed for a Unix or VMS environment. If you
	428	encounter problems, or discover cases where the search could be improved,
	429	please let us know.
	430
864a5fa8	431	=head1 SEE ALSO
	432
	433	L<ExtUtils::MakeMaker>
	434
	435	=cut
	436