[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,"^\Qlib$thislib.$so.\E[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.
4e1fac24	80	if (@fullname =
4e1fac24	81	$self->lsdir($thispth,"^\Qlib$thislib.$so.\E[0-9]+")){
005c1a0e	82	# Take care that libfoo.so.10 wins against libfoo.so.9.
	83	# Compare two libraries to find the most recent version
	84	# number. E.g. if you have libfoo.so.9.0.7 and
	85	# libfoo.so.10.1, first convert all digits into two
	86	# decimal places. Then we'll add ".00" to the shorter
	87	# strings so that we're comparing strings of equal length
	88	# Thus we'll compare libfoo.so.09.07.00 with
	89	# libfoo.so.10.01.00. Some libraries might have letters
	90	# in the version. We don't know what they mean, but will
	91	# try to skip them gracefully -- we'll set any letter to
	92	# '0'. Finally, sort in reverse so we can take the
	93	# first element.
	94
	95	#TODO: iterate through the directory instead of sorting
	96
	97	$fullname = "$thispth/" .
	98	(sort { my($ma) = $a;
	99	my($mb) = $b;
	100	$ma =~ tr/A-Za-z/0/s;
	101	$ma =~ s/\b(\d)\b/0$1/g;
	102	$mb =~ tr/A-Za-z/0/s;
	103	$mb =~ s/\b(\d)\b/0$1/g;
	104	while (length($ma) < length($mb)) { $ma .= ".00"; }
	105	while (length($mb) < length($ma)) { $mb .= ".00"; }
	106	# Comparison deliberately backwards
	107	$mb cmp $ma;} @fullname)[0];
	108	} elsif (-f ($fullname="$thispth/lib$thislib.$so")
	109	&& (($Config{'dlsrc'} ne "dl_dld.xs") \|\| ($thislib eq "m"))){
4633a7c4	110	} elsif (-f ($fullname="$thispth/lib${thislib}_s$Config_libext")
005c1a0e	111	&& ($thislib .= "_s") ){ # we must explicitly use _s version
4633a7c4	112	} elsif (-f ($fullname="$thispth/lib$thislib$Config_libext")){
864a5fa8	113	} elsif (-f ($fullname="$thispth/$thislib$Config_libext")){
4633a7c4	114	} elsif (-f ($fullname="$thispth/Slib$thislib$Config_libext")){
8f1aa56b	115	} elsif ($^O eq 'dgux'
c07a80fd	116	&& -l ($fullname="$thispth/lib$thislib$Config_libext")
	117	&& readlink($fullname) =~ /^elink:/) {
	118	# Some of DG's libraries look like misconnected symbolic
	119	# links, but development tools can follow them. (They
	120	# look like this:
	121	#
	122	# libm.a -> elink:${SDE_PATH:-/usr}/sde/\
	123	# ${TARGET_BINARY_INTERFACE:-m88kdgux}/usr/lib/libm.a
	124	#
	125	# , the compilation tools expand the environment variables.)
005c1a0e	126	} else {
8e07c86e	127	print STDOUT "$thislib not found in $thispth\n" if $Verbose;
005c1a0e	128	next;
005c1a0e	129	}
8e07c86e	130	print STDOUT "'-l$thislib' found at $fullname\n" if $Verbose;
4633a7c4	131	my($fullnamedir) = dirname($fullname);
4633a7c4	132	push @ld_run_path, $fullnamedir unless $ld_run_path_seen{$fullnamedir}++;
005c1a0e	133	$found++;
	134	$found_lib++;
	135
	136	# Now update library lists
	137
	138	# what do we know about this library...
4633a7c4	139	my $is_dyna = ($fullname !~ /\Q$Config_libext\E$/);
4e68a208	140	my $in_perl = ($libs =~ /\B-l\Q$ {thislib}\E\b/s);
005c1a0e	141
	142	# Do not add it into the list if it is already linked in
	143	# with the main perl executable.
974f612f	144	# We have to special-case the NeXT, because math and ndbm
974f612f	145	# are both in libsys_s
005c1a0e	146	unless ($in_perl \|\|
974f612f	147	($Config{'osname'} eq 'next' &&
974f612f	148	($thislib eq 'm' \|\| $thislib eq 'ndbm')) ){
005c1a0e	149	push(@extralibs, "-l$thislib");
	150	}
	151
	152	# We might be able to load this archive file dynamically
974f612f	153	if ( ($Config{'dlsrc'} =~ /dl_next/ && $Config{'osvers'} lt '4_0')
	154	\|\| ($Config{'dlsrc'} =~ /dl_dld/) )
	155	{
005c1a0e	156	# We push -l$thislib instead of $fullname because
	157	# it avoids hardwiring a fixed path into the .bs file.
	158	# Mkbootstrap will automatically add dl_findfile() to
	159	# the .bs file if it sees a name in the -l format.
	160	# USE THIS, when dl_findfile() is fixed:
	161	# push(@bsloadlibs, "-l$thislib");
	162	# OLD USE WAS while checking results against old_extliblist
	163	push(@bsloadlibs, "$fullname");
	164	} else {
	165	if ($is_dyna){
	166	# For SunOS4, do not add in this shared library if
	167	# it is already linked in the main perl executable
	168	push(@ldloadlibs, "-l$thislib")
8f1aa56b	169	unless ($in_perl and $^O eq 'sunos');
005c1a0e	170	} else {
	171	push(@ldloadlibs, "-l$thislib");
	172	}
	173	}
	174	last; # found one here so don't bother looking further
	175	}
864a5fa8	176	print STDOUT "Warning (will try anyway): No library found for -l$thislib\n"
005c1a0e	177	unless $found_lib>0;
005c1a0e	178	}
4633a7c4	179	return ('','','','') unless $found;
4633a7c4	180	("@extralibs", "@bsloadlibs", "@ldloadlibs",join(":",@ld_run_path));
005c1a0e	181	}
005c1a0e	182
55497cff	183
	184	sub _vms_ext {
	185	my($self, $potential_libs,$verbose) = @_;
	186	return ('', '', '', '') unless $potential_libs;
	187
	188	my(@dirs,@libs,$dir,$lib,%sh,%olb,%obj);
	189	my $cwd = cwd();
	190	my($so,$lib_ext,$obj_ext) = @Config{'so','lib_ext','obj_ext'};
	191	# List of common Unix library names and there VMS equivalents
	192	# (VMS equivalent of '' indicates that the library is automatially
	193	# searched by the linker, and should be skipped here.)
	194	my %libmap = ( 'm' => '', 'f77' => '', 'F77' => '', 'V77' => '', 'c' => '',
	195	'malloc' => '', 'crypt' => '', 'resolv' => '', 'c_s' => '',
	196	'socket' => '', 'X11' => 'DECW$XLIBSHR',
	197	'Xt' => 'DECW$XTSHR', 'Xm' => 'DECW$XMLIBSHR',
	198	'Xmu' => 'DECW$XMULIBSHR');
	199	if ($Config{'vms_cc_type'} ne 'decc') { $libmap{'curses'} = 'VAXCCURSE'; }
	200
	201	print STDOUT "Potential libraries are '$potential_libs'\n" if $verbose;
	202
	203	# First, sort out directories and library names in the input
	204	foreach $lib (split ' ',$potential_libs) {
	205	push(@dirs,$1), next if $lib =~ /^-L(.*)/;
	206	push(@dirs,$lib), next if $lib =~ /[:>\]]$/;
	207	push(@dirs,$lib), next if -d $lib;
	208	push(@libs,$1), next if $lib =~ /^-l(.*)/;
	209	push(@libs,$lib);
	210	}
	211	push(@dirs,split(' ',$Config{'libpth'}));
	212
	213	# Now make sure we've got VMS-syntax absolute directory specs
	214	# (We don't, however, check whether someone's hidden a relative
	215	# path in a logical name.)
	216	foreach $dir (@dirs) {
	217	unless (-d $dir) {
	218	print STDOUT "Skipping nonexistent Directory $dir\n" if $verbose > 1;
	219	$dir = '';
	220	next;
	221	}
	222	print STDOUT "Resolving directory $dir\n" if $verbose;
	223	if ($self->file_name_is_absolute($dir)) { $dir = $self->fixpath($dir,1); }
	224	else { $dir = $self->catdir($cwd,$dir); }
	225	}
	226	@dirs = grep { length($_) } @dirs;
	227	unshift(@dirs,''); # Check each $lib without additions first
	228
	229	LIB: foreach $lib (@libs) {
	230	if (exists $libmap{$lib}) {
	231	next unless length $libmap{$lib};
	232	$lib = $libmap{$lib};
	233	}
	234
	235	my(@variants,$variant,$name,$test,$cand);
	236	my($ctype) = '';
	237
	238	# If we don't have a file type, consider it a possibly abbreviated name and
	239	# check for common variants. We try these first to grab libraries before
	240	# a like-named executable image (e.g. -lperl resolves to perlshr.exe
	241	# before perl.exe).
	242	if ($lib !~ /\.[^:>\]]*$/) {
	243	push(@variants,"${lib}shr","${lib}rtl","${lib}lib");
	244	push(@variants,"lib$lib") if $lib !~ /[:>\]]/;
	245	}
	246	push(@variants,$lib);
247	print STDOUT "Looking for $lib\n" if $verbose;
248	foreach $variant (@variants) {
249	foreach $dir (@dirs) {
250	my($type);
251
252	$name = "$dir$variant";
253	print "\tChecking $name\n" if $verbose > 2;
254	if (-f ($test = VMS::Filespec::rmsexpand($name))) {
255	# It's got its own suffix, so we'll have to figure out the type
256	if ($test =~ /(?:$so\|exe)$/i) { $type = 'sh'; }
257	elsif ($test =~ /(?:$lib_ext\|olb)$/i) { $type = 'olb'; }
258	elsif ($test =~ /(?:$obj_ext\|obj)$/i) {
259	print STDOUT "Warning (will try anyway): Plain object file $test found in library list\n";
260	$type = 'obj';
261	}
262	else {
263	print STDOUT "Warning (will try anyway): Unknown library type for $test; assuming shared\n";
264	$type = 'sh';
265	}
266	}
267	elsif (-f ($test = VMS::Filespec::rmsexpand($name,$so)) or
268	-f ($test = VMS::Filespec::rmsexpand($name,'.exe'))) {
269	$type = 'sh';
270	$name = $test unless $test =~ /exe;?\d*$/i;
271	}
272	elsif (not length($ctype) and # If we've got a lib already, don't bother
273	( -f ($test = VMS::Filespec::rmsexpand($name,$lib_ext)) or
274	-f ($test = VMS::Filespec::rmsexpand($name,'.olb')))) {
275	$type = 'olb';
276	$name = $test unless $test =~ /olb;?\d*$/i;
277	}
278	elsif (not length($ctype) and # If we've got a lib already, don't bother
279	( -f ($test = VMS::Filespec::rmsexpand($name,$obj_ext)) or
280	-f ($test = VMS::Filespec::rmsexpand($name,'.obj')))) {
281	print STDOUT "Warning (will try anyway): Plain object file $test found in library list\n";
282	$type = 'obj';
283	$name = $test unless $test =~ /obj;?\d*$/i;
284	}
285	if (defined $type) {
286	$ctype = $type; $cand = $name;
287	last if $ctype eq 'sh';
288	}
289	}
290	if ($ctype) {
291	eval '$' . $ctype . "{'$cand'}++";
292	die "Error recording library: $@" if $@;
293	print STDOUT "\tFound as $name (really $test), type $type\n" if $verbose > 1;
294	next LIB;
295	}
296	}
297	print STDOUT "Warning (will try anyway): No library found for $lib\n";
298	}
299
300	@libs = sort keys %obj;
301	# This has to precede any other CRTLs, so just make it first
302	if ($olb{VAXCCURSE}) {
303	push(@libs,"$olb{VAXCCURSE}/Library");
304	delete $olb{VAXCCURSE};
305	}
306	push(@libs, map { "$_/Library" } sort keys %olb);
307	push(@libs, map { "$_/Share" } sort keys %sh);
308	$lib = join(' ',@libs);
309	print "Result: $lib\n" if $verbose;
310	wantarray ? ($lib, '', $lib, '') : $lib;
311	}
312
005c1a0e	313	1;
c2e89b3d	314
864a5fa8	315	__END__
cb1a09d0	316
864a5fa8	317	=head1 NAME
	318
	319	ExtUtils::Liblist - determine libraries to use and how to use them
	320
	321	=head1 SYNOPSIS
	322
	323	C<require ExtUtils::Liblist;>
	324
	325	C<ExtUtils::Liblist::ext($potential_libs, $Verbose);>
	326
	327	=head1 DESCRIPTION
	328
	329	This utility takes a list of libraries in the form C<-llib1 -llib2
	330	-llib3> and prints out lines suitable for inclusion in an extension
	331	Makefile. Extra library paths may be included with the form
	332	C<-L/another/path> this will affect the searches for all subsequent
	333	libraries.
	334
	335	It returns an array of four scalar values: EXTRALIBS, BSLOADLIBS,
	336	LDLOADLIBS, and LD_RUN_PATH.
	337
	338	Dependent libraries can be linked in one of three ways:
	339
	340	=over 2
	341
	342	=item * For static extensions
	343
	344	by the ld command when the perl binary is linked with the extension
	345	library. See EXTRALIBS below.
	346
	347	=item * For dynamic extensions
	348
	349	by the ld command when the shared object is built/linked. See
	350	LDLOADLIBS below.
	351
	352	=item * For dynamic extensions
	353
	354	by the DynaLoader when the shared object is loaded. See BSLOADLIBS
	355	below.
	356
	357	=back
	358
	359	=head2 EXTRALIBS
	360
	361	List of libraries that need to be linked with when linking a perl
	362	binary which includes this extension Only those libraries that
	363	actually exist are included. These are written to a file and used
	364	when linking perl.
	365
	366	=head2 LDLOADLIBS and LD_RUN_PATH
	367
	368	List of those libraries which can or must be linked into the shared
	369	library when created using ld. These may be static or dynamic
	370	libraries. LD_RUN_PATH is a colon separated list of the directories
	371	in LDLOADLIBS. It is passed as an environment variable to the process
	372	that links the shared library.
	373
	374	=head2 BSLOADLIBS
	375
	376	List of those libraries that are needed but can be linked in
	377	dynamically at run time on this platform. SunOS/Solaris does not need
	378	this because ld records the information (from LDLOADLIBS) into the
	379	object file. This list is used to create a .bs (bootstrap) file.
	380
381	=head1 PORTABILITY
382
383	This module deals with a lot of system dependencies and has quite a
384	few architecture specific B<if>s in the code.
385
55497cff	386	=head2 VMS implementation
	387
	388	The version of ext() which is executed under VMS differs from the
	389	Unix-OS/2 version in several respects:
	390
	391	=over 2
	392
	393	=item *
	394
	395	Input library and path specifications are accepted with or without the
	396	C<-l> and C<-L> prefices used by Unix linkers. If neither prefix is
	397	present, a token is considered a directory to search if it is in fact
	398	a directory, and a library to search for otherwise. Authors who wish
	399	their extensions to be portable to Unix or OS/2 should use the Unix
	400	prefixes, since the Unix-OS/2 version of ext() requires them.
	401
	402	=item *
	403
	404	Wherever possible, shareable images are preferred to object libraries,
	405	and object libraries to plain object files. In accordance with VMS
	406	naming conventions, ext() looks for files named I<lib>shr and I<lib>rtl;
	407	it also looks for I<lib>lib and libI<lib> to accomodate Unix conventions
	408	used in some ported software.
	409
	410	=item *
	411
	412	For each library that is found, an appropriate directive for a linker options
	413	file is generated. The return values are space-separated strings of
	414	these directives, rather than elements used on the linker command line.
	415
	416	=item *
	417
	418	LDLOADLIBS and EXTRALIBS are always identical under VMS, and BSLOADLIBS
	419	and LD_RIN_PATH are always empty.
	420
	421	=back
	422
	423	In addition, an attempt is made to recognize several common Unix library
	424	names, and filter them out or convert them to their VMS equivalents, as
	425	appropriate.
	426
	427	In general, the VMS version of ext() should properly handle input from
	428	extensions originally designed for a Unix or VMS environment. If you
	429	encounter problems, or discover cases where the search could be improved,
	430	please let us know.
	431
864a5fa8	432	=head1 SEE ALSO
	433
	434	L<ExtUtils::MakeMaker>
	435
	436	=cut
	437