1 package ExtUtils::Liblist;
3 # Broken out of MakeMaker from version 4.11
5 $VERSION = substr q$Revision: 1.21 $, 10;
12 if ($^O eq 'VMS') { return &_vms_ext; }
13 else { return &_unix_os2_ext; }
17 my($self,$potential_libs, $Verbose) = @_;
18 if ($^O =~ 'os2' and $Config{libs}) {
19 # Dynamic libraries are not transitive, so we may need including
20 # the libraries linked against perl.dll again.
22 $potential_libs .= " " if $potential_libs;
23 $potential_libs .= $Config{libs};
25 return ("", "", "", "") unless $potential_libs;
26 print STDOUT "Potential libraries are '$potential_libs':\n" if $Verbose;
28 my($so) = $Config{'so'};
29 my($libs) = $Config{'libs'};
30 my $Config_libext = $Config{lib_ext} || ".a";
33 # compute $extralibs, $bsloadlibs and $ldloadlibs from
35 # this is a rewrite of Andy Dougherty's extliblist in perl
36 # its home is in <distribution>/ext/util
38 my(@searchpath); # from "-L/path" entries in $potential_libs
39 my(@libpath) = split " ", $Config{'libpth'};
40 my(@ldloadlibs, @bsloadlibs, @extralibs, @ld_run_path, %ld_run_path_seen);
41 my($fullname, $thislib, $thispth, @fullname);
42 my($pwd) = cwd(); # from Cwd.pm
45 foreach $thislib (split ' ', $potential_libs){
47 # Handle possible linker path arguments.
48 if ($thislib =~ s/^(-[LR])//){ # save path flag type
51 print STDOUT "$ptype$thislib ignored, directory does not exist\n"
55 unless ($self->file_name_is_absolute($thislib)) {
56 print STDOUT "Warning: $ptype$thislib changed to $ptype$pwd/$thislib\n";
57 $thislib = $self->catdir($pwd,$thislib);
59 push(@searchpath, $thislib);
60 push(@extralibs, "$ptype$thislib");
61 push(@ldloadlibs, "$ptype$thislib");
65 # Handle possible library arguments.
66 unless ($thislib =~ s/^-l//){
67 print STDOUT "Unrecognized argument in LIBS ignored: '$thislib'\n";
72 foreach $thispth (@searchpath, @libpath){
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.
81 $self->lsdir($thispth,"^\Qlib$thislib.$so.\E[0-9]+")){
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
95 #TODO: iterate through the directory instead of sorting
97 $fullname = "$thispth/" .
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") || ($thislib eq "m"))){
110 } elsif (-f ($fullname="$thispth/lib${thislib}_s$Config_libext")
111 && ($thislib .= "_s") ){ # we must explicitly use _s version
112 } elsif (-f ($fullname="$thispth/lib$thislib$Config_libext")){
113 } elsif (-f ($fullname="$thispth/$thislib$Config_libext")){
114 } elsif (-f ($fullname="$thispth/Slib$thislib$Config_libext")){
115 } elsif ($^O eq 'dgux'
116 && -l ($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
122 # libm.a -> elink:${SDE_PATH:-/usr}/sde/\
123 # ${TARGET_BINARY_INTERFACE:-m88kdgux}/usr/lib/libm.a
125 # , the compilation tools expand the environment variables.)
127 print STDOUT "$thislib not found in $thispth\n" if $Verbose;
130 print STDOUT "'-l$thislib' found at $fullname\n" if $Verbose;
131 my($fullnamedir) = dirname($fullname);
132 push @ld_run_path, $fullnamedir unless $ld_run_path_seen{$fullnamedir}++;
136 # Now update library lists
138 # what do we know about this library...
139 my $is_dyna = ($fullname !~ /\Q$Config_libext\E$/);
140 my $in_perl = ($libs =~ /\B-l\Q$ {thislib}\E\b/s);
142 # Do not add it into the list if it is already linked in
143 # with the main perl executable.
144 # We have to special-case the NeXT, because math and ndbm
145 # are both in libsys_s
147 ($Config{'osname'} eq 'next' &&
148 ($thislib eq 'm' || $thislib eq 'ndbm')) ){
149 push(@extralibs, "-l$thislib");
152 # We might be able to load this archive file dynamically
153 if ( ($Config{'dlsrc'} =~ /dl_next/ && $Config{'osvers'} lt '4_0')
154 || ($Config{'dlsrc'} =~ /dl_dld/) )
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, "$fullname");
166 # For SunOS4, do not add in this shared library if
167 # it is already linked in the main perl executable
168 push(@ldloadlibs, "-l$thislib")
169 unless ($in_perl and $^O eq 'sunos');
171 push(@ldloadlibs, "-l$thislib");
174 last; # found one here so don't bother looking further
176 print STDOUT "Warning (will try anyway): No library found for -l$thislib\n"
179 return ('','','','') unless $found;
180 ("@extralibs", "@bsloadlibs", "@ldloadlibs",join(":",@ld_run_path));
185 my($self, $potential_libs,$verbose) = @_;
186 return ('', '', '', '') unless $potential_libs;
188 my(@dirs,@libs,$dir,$lib,%sh,%olb,%obj);
190 my($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') { $libmap{'curses'} = 'VAXCCURSE'; }
201 print STDOUT "Potential libraries are '$potential_libs'\n" if $verbose;
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 $lib =~ /^-l(.*)/;
211 push(@dirs,split(' ',$Config{'libpth'}));
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) {
218 print STDOUT "Skipping nonexistent Directory $dir\n" if $verbose > 1;
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,$dir); }
226 @dirs = grep { length($_) } @dirs;
227 unshift(@dirs,''); # Check each $lib without additions first
229 LIB: foreach $lib (@libs) {
230 if (exists $libmap{$lib}) {
231 next unless length $libmap{$lib};
232 $lib = $libmap{$lib};
235 my(@variants,$variant,$name,$test,$cand);
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
242 if ($lib !~ /\.[^:>\]]*$/) {
243 push(@variants,"${lib}shr","${lib}rtl","${lib}lib");
244 push(@variants,"lib$lib") if $lib !~ /[:>\]]/;
246 push(@variants,$lib);
247 print STDOUT "Looking for $lib\n" if $verbose;
248 foreach $variant (@variants) {
249 foreach $dir (@dirs) {
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";
263 print STDOUT "Warning (will try anyway): Unknown library type for $test; assuming shared\n";
267 elsif (-f ($test = VMS::Filespec::rmsexpand($name,$so)) or
268 -f ($test = VMS::Filespec::rmsexpand($name,'.exe'))) {
270 $name = $test unless $test =~ /exe;?\d*$/i;
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')))) {
276 $name = $test unless $test =~ /olb;?\d*$/i;
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";
283 $name = $test unless $test =~ /obj;?\d*$/i;
286 $ctype = $type; $cand = $name;
287 last if $ctype eq 'sh';
291 eval '$' . $ctype . "{'$cand'}++";
292 die "Error recording library: $@" if $@;
293 print STDOUT "\tFound as $cand (really $ctest), type $ctype\n" if $verbose > 1;
297 print STDOUT "Warning (will try anyway): No library found for $lib\n";
300 @libs = sort keys %obj;
301 # This has to precede any other CRTLs, so just make it first
302 if ($olb{VAXCCURSE}) {
303 push(@libs,"$olb{VAXCCURSE}/Library");
304 delete $olb{VAXCCURSE};
306 push(@libs, map { "$_/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, '') : $lib;
319 ExtUtils::Liblist - determine libraries to use and how to use them
323 C<require ExtUtils::Liblist;>
325 C<ExtUtils::Liblist::ext($potential_libs, $Verbose);>
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
335 It returns an array of four scalar values: EXTRALIBS, BSLOADLIBS,
336 LDLOADLIBS, and LD_RUN_PATH.
338 Dependent libraries can be linked in one of three ways:
342 =item * For static extensions
344 by the ld command when the perl binary is linked with the extension
345 library. See EXTRALIBS below.
347 =item * For dynamic extensions
349 by the ld command when the shared object is built/linked. See
352 =item * For dynamic extensions
354 by the DynaLoader when the shared object is loaded. See BSLOADLIBS
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
366 =head2 LDLOADLIBS and LD_RUN_PATH
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.
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.
383 This module deals with a lot of system dependencies and has quite a
384 few architecture specific B<if>s in the code.
386 =head2 VMS implementation
388 The version of ext() which is executed under VMS differs from the
389 Unix-OS/2 version in several respects:
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.
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.
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.
418 LDLOADLIBS and EXTRALIBS are always identical under VMS, and BSLOADLIBS
419 and LD_RIN_PATH are always empty.
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
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,
434 L<ExtUtils::MakeMaker>