home *** CD-ROM | disk | FTP | other *** search
- package ExtUtils::Liblist;
- use vars qw($VERSION);
- # Broken out of MakeMaker from version 4.11
-
- $VERSION = substr q$Revision: 1.3 $, 10;
-
- use Config;
- use Cwd 'cwd';
- use File::Basename;
-
- sub ext {
- if ($^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 "Note (probably harmless): "
- ."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 "Note (probably harmless): "
- ."Plain object file $test found in library list\n";
- $type = 'obj';
- }
- else {
- print STDOUT "Note (probably harmless): "
- ."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 "Note (probably harmless): "
- ."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 $cand (really $ctest), type $ctype\n" if $verbose > 1;
- next LIB;
- }
- }
- print STDOUT "Note (probably harmless): "
- ."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
-
-