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005c1a0e |
1 | package ExtUtils::Liblist; |
8a1da95f |
2 | use vars qw($VERSION); |
005c1a0e |
3 | # Broken out of MakeMaker from version 4.11 |
4 | |
84902520 |
5 | $VERSION = substr q$Revision: 1.25 $, 10; |
f1387719 |
6 | |
005c1a0e |
7 | use Config; |
8f1aa56b |
8 | use Cwd 'cwd'; |
4633a7c4 |
9 | use File::Basename; |
10 | |
005c1a0e |
11 | sub ext { |
3e3baf6d |
12 | if ($^O eq 'VMS') { return &_vms_ext; } |
13 | elsif($^O eq 'MSWin32') { return &_win32_ext; } |
14 | else { return &_unix_os2_ext; } |
55497cff |
15 | } |
16 | |
17 | sub _unix_os2_ext { |
e611f912 |
18 | my($self,$potential_libs, $verbose) = @_; |
f1387719 |
19 | if ($^O =~ 'os2' and $Config{libs}) { |
4e68a208 |
20 | # Dynamic libraries are not transitive, so we may need including |
21 | # the libraries linked against perl.dll again. |
22 | |
23 | $potential_libs .= " " if $potential_libs; |
24 | $potential_libs .= $Config{libs}; |
25 | } |
4633a7c4 |
26 | return ("", "", "", "") unless $potential_libs; |
fb73857a |
27 | warn "Potential libraries are '$potential_libs':\n" if $verbose; |
005c1a0e |
28 | |
29 | my($so) = $Config{'so'}; |
30 | my($libs) = $Config{'libs'}; |
55497cff |
31 | my $Config_libext = $Config{lib_ext} || ".a"; |
32 | |
005c1a0e |
33 | |
34 | # compute $extralibs, $bsloadlibs and $ldloadlibs from |
35 | # $potential_libs |
36 | # this is a rewrite of Andy Dougherty's extliblist in perl |
005c1a0e |
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 $thislib){ |
fb73857a |
51 | warn "$ptype$thislib ignored, directory does not exist\n" |
e611f912 |
52 | if $verbose; |
005c1a0e |
53 | next; |
54 | } |
f1387719 |
55 | unless ($self->file_name_is_absolute($thislib)) { |
fb73857a |
56 | warn "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//){ |
fb73857a |
67 | warn "Unrecognized argument in LIBS ignored: '$thislib'\n"; |
005c1a0e |
68 | next; |
69 | } |
70 | |
71 | my($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 = |
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 | # ${TARGET_BINARY_INTERFACE:-m88kdgux}/usr/lib/libm.a |
124 | # |
125 | # , the compilation tools expand the environment variables.) |
005c1a0e |
126 | } else { |
fb73857a |
127 | warn "$thislib not found in $thispth\n" if $verbose; |
005c1a0e |
128 | next; |
129 | } |
fb73857a |
130 | warn "'-l$thislib' found at $fullname\n" if $verbose; |
4633a7c4 |
131 | my($fullnamedir) = dirname($fullname); |
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 |
145 | # are both in libsys_s |
005c1a0e |
146 | unless ($in_perl || |
974f612f |
147 | ($Config{'osname'} eq 'next' && |
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 | } |
fb73857a |
176 | warn "Note (probably harmless): " |
f3d9a6ba |
177 | ."No library found for -l$thislib\n" |
005c1a0e |
178 | unless $found_lib>0; |
179 | } |
4633a7c4 |
180 | return ('','','','') unless $found; |
181 | ("@extralibs", "@bsloadlibs", "@ldloadlibs",join(":",@ld_run_path)); |
005c1a0e |
182 | } |
183 | |
3e3baf6d |
184 | sub _win32_ext { |
e611f912 |
185 | my($self, $potential_libs, $verbose) = @_; |
3e3baf6d |
186 | |
187 | # If user did not supply a list, we punt. |
188 | # (caller should probably use the list in $Config{libs}) |
189 | return ("", "", "", "") unless $potential_libs; |
190 | |
191 | my($so) = $Config{'so'}; |
192 | my($libs) = $Config{'libs'}; |
193 | my($libpth) = $Config{'libpth'}; |
194 | my($libext) = $Config{'lib_ext'} || ".lib"; |
195 | |
196 | if ($libs and $potential_libs !~ /:nodefault/i) { |
197 | # If Config.pm defines a set of default libs, we always |
198 | # tack them on to the user-supplied list, unless the user |
199 | # specified :nodefault |
200 | |
201 | $potential_libs .= " " if $potential_libs; |
202 | $potential_libs .= $libs; |
203 | } |
fb73857a |
204 | warn "Potential libraries are '$potential_libs':\n" if $verbose; |
3e3baf6d |
205 | |
206 | # compute $extralibs from $potential_libs |
207 | |
208 | my(@searchpath); # from "-L/path" entries in $potential_libs |
209 | my(@libpath) = split " ", $libpth; |
210 | my(@extralibs); |
211 | my($fullname, $thislib, $thispth); |
212 | my($pwd) = cwd(); # from Cwd.pm |
213 | my($lib) = ''; |
214 | my($found) = 0; |
215 | |
216 | foreach $thislib (split ' ', $potential_libs){ |
217 | |
218 | # Handle possible linker path arguments. |
219 | if ($thislib =~ s/^-L// and not -d $thislib) { |
fb73857a |
220 | warn "-L$thislib ignored, directory does not exist\n" |
e611f912 |
221 | if $verbose; |
3e3baf6d |
222 | next; |
223 | } |
224 | elsif (-d $thislib) { |
225 | unless ($self->file_name_is_absolute($thislib)) { |
fb73857a |
226 | warn "Warning: -L$thislib changed to -L$pwd/$thislib\n"; |
3e3baf6d |
227 | $thislib = $self->catdir($pwd,$thislib); |
228 | } |
229 | push(@searchpath, $thislib); |
230 | next; |
231 | } |
232 | |
233 | # Handle possible library arguments. |
2d7a9237 |
234 | if ($thislib =~ s/^-l// and $thislib !~ /^lib/i) { |
235 | $thislib = "lib$thislib"; |
236 | } |
3e3baf6d |
237 | $thislib .= $libext if $thislib !~ /\Q$libext\E$/i; |
238 | |
239 | my($found_lib)=0; |
240 | foreach $thispth (@searchpath, @libpath){ |
241 | unless (-f ($fullname="$thispth\\$thislib")) { |
fb73857a |
242 | warn "$thislib not found in $thispth\n" if $verbose; |
3e3baf6d |
243 | next; |
244 | } |
fb73857a |
245 | warn "'$thislib' found at $fullname\n" if $verbose; |
3e3baf6d |
246 | $found++; |
247 | $found_lib++; |
248 | push(@extralibs, $fullname); |
249 | last; |
250 | } |
fb73857a |
251 | warn "Note (probably harmless): " |
3e3baf6d |
252 | ."No library found for '$thislib'\n" |
253 | unless $found_lib>0; |
254 | } |
255 | return ('','','','') unless $found; |
256 | $lib = join(' ',@extralibs); |
fb73857a |
257 | warn "Result: $lib\n" if $verbose; |
3e3baf6d |
258 | wantarray ? ($lib, '', $lib, '') : $lib; |
259 | } |
260 | |
55497cff |
261 | |
262 | sub _vms_ext { |
263 | my($self, $potential_libs,$verbose) = @_; |
09b7f37c |
264 | my(@crtls,$crtlstr); |
265 | my($dbgqual) = $self->{OPTIMIZE} || $Config{'optimize'} || |
266 | $self->{CCFLAS} || $Config{'ccflags'}; |
267 | @crtls = ( ($dbgqual =~ m-/Debug-i ? $Config{'dbgprefix'} : '') |
268 | . 'PerlShr/Share' ); |
269 | push(@crtls, grep { not /\(/ } split /\s+/, $Config{'libs'}); |
270 | push(@crtls, grep { not /\(/ } split /\s+/, $Config{'libc'}); |
271 | # In general, we pass through the basic libraries from %Config unchanged. |
272 | # The one exception is that if we're building in the Perl source tree, and |
273 | # a library spec could be resolved via a logical name, we go to some trouble |
274 | # to insure that the copy in the local tree is used, rather than one to |
275 | # which a system-wide logical may point. |
276 | if ($self->{PERL_SRC}) { |
277 | my($lib,$locspec,$type); |
278 | foreach $lib (@crtls) { |
279 | if (($locspec,$type) = $lib =~ m-^([\w$\-]+)(/\w+)?- and $locspec =~ /perl/i) { |
280 | if (lc $type eq '/share') { $locspec .= $Config{'exe_ext'}; } |
281 | elsif (lc $type eq '/library') { $locspec .= $Config{'lib_ext'}; } |
282 | else { $locspec .= $Config{'obj_ext'}; } |
283 | $locspec = $self->catfile($self->{PERL_SRC},$locspec); |
284 | $lib = "$locspec$type" if -e $locspec; |
285 | } |
286 | } |
287 | } |
288 | $crtlstr = @crtls ? join(' ',@crtls) : ''; |
55497cff |
289 | |
09b7f37c |
290 | unless ($potential_libs) { |
291 | warn "Result:\n\tEXTRALIBS: \n\tLDLOADLIBS: $crtlstr\n" if $verbose; |
292 | return ('', '', $crtlstr, ''); |
293 | } |
294 | |
295 | my(@dirs,@libs,$dir,$lib,%sh,%olb,%obj,$ldlib); |
55497cff |
296 | my $cwd = cwd(); |
297 | my($so,$lib_ext,$obj_ext) = @Config{'so','lib_ext','obj_ext'}; |
298 | # List of common Unix library names and there VMS equivalents |
299 | # (VMS equivalent of '' indicates that the library is automatially |
300 | # searched by the linker, and should be skipped here.) |
301 | my %libmap = ( 'm' => '', 'f77' => '', 'F77' => '', 'V77' => '', 'c' => '', |
302 | 'malloc' => '', 'crypt' => '', 'resolv' => '', 'c_s' => '', |
303 | 'socket' => '', 'X11' => 'DECW$XLIBSHR', |
304 | 'Xt' => 'DECW$XTSHR', 'Xm' => 'DECW$XMLIBSHR', |
305 | 'Xmu' => 'DECW$XMULIBSHR'); |
306 | if ($Config{'vms_cc_type'} ne 'decc') { $libmap{'curses'} = 'VAXCCURSE'; } |
307 | |
fb73857a |
308 | warn "Potential libraries are '$potential_libs'\n" if $verbose; |
55497cff |
309 | |
310 | # First, sort out directories and library names in the input |
311 | foreach $lib (split ' ',$potential_libs) { |
312 | push(@dirs,$1), next if $lib =~ /^-L(.*)/; |
313 | push(@dirs,$lib), next if $lib =~ /[:>\]]$/; |
314 | push(@dirs,$lib), next if -d $lib; |
315 | push(@libs,$1), next if $lib =~ /^-l(.*)/; |
316 | push(@libs,$lib); |
317 | } |
318 | push(@dirs,split(' ',$Config{'libpth'})); |
319 | |
320 | # Now make sure we've got VMS-syntax absolute directory specs |
321 | # (We don't, however, check whether someone's hidden a relative |
322 | # path in a logical name.) |
323 | foreach $dir (@dirs) { |
324 | unless (-d $dir) { |
fb73857a |
325 | warn "Skipping nonexistent Directory $dir\n" if $verbose > 1; |
55497cff |
326 | $dir = ''; |
327 | next; |
328 | } |
fb73857a |
329 | warn "Resolving directory $dir\n" if $verbose; |
55497cff |
330 | if ($self->file_name_is_absolute($dir)) { $dir = $self->fixpath($dir,1); } |
331 | else { $dir = $self->catdir($cwd,$dir); } |
332 | } |
333 | @dirs = grep { length($_) } @dirs; |
334 | unshift(@dirs,''); # Check each $lib without additions first |
335 | |
336 | LIB: foreach $lib (@libs) { |
337 | if (exists $libmap{$lib}) { |
338 | next unless length $libmap{$lib}; |
339 | $lib = $libmap{$lib}; |
340 | } |
341 | |
342 | my(@variants,$variant,$name,$test,$cand); |
343 | my($ctype) = ''; |
344 | |
345 | # If we don't have a file type, consider it a possibly abbreviated name and |
346 | # check for common variants. We try these first to grab libraries before |
347 | # a like-named executable image (e.g. -lperl resolves to perlshr.exe |
348 | # before perl.exe). |
349 | if ($lib !~ /\.[^:>\]]*$/) { |
350 | push(@variants,"${lib}shr","${lib}rtl","${lib}lib"); |
351 | push(@variants,"lib$lib") if $lib !~ /[:>\]]/; |
352 | } |
353 | push(@variants,$lib); |
fb73857a |
354 | warn "Looking for $lib\n" if $verbose; |
55497cff |
355 | foreach $variant (@variants) { |
356 | foreach $dir (@dirs) { |
357 | my($type); |
358 | |
359 | $name = "$dir$variant"; |
fb73857a |
360 | warn "\tChecking $name\n" if $verbose > 2; |
55497cff |
361 | if (-f ($test = VMS::Filespec::rmsexpand($name))) { |
362 | # It's got its own suffix, so we'll have to figure out the type |
363 | if ($test =~ /(?:$so|exe)$/i) { $type = 'sh'; } |
364 | elsif ($test =~ /(?:$lib_ext|olb)$/i) { $type = 'olb'; } |
365 | elsif ($test =~ /(?:$obj_ext|obj)$/i) { |
fb73857a |
366 | warn "Note (probably harmless): " |
f3d9a6ba |
367 | ."Plain object file $test found in library list\n"; |
55497cff |
368 | $type = 'obj'; |
369 | } |
370 | else { |
fb73857a |
371 | warn "Note (probably harmless): " |
f3d9a6ba |
372 | ."Unknown library type for $test; assuming shared\n"; |
55497cff |
373 | $type = 'sh'; |
374 | } |
375 | } |
376 | elsif (-f ($test = VMS::Filespec::rmsexpand($name,$so)) or |
377 | -f ($test = VMS::Filespec::rmsexpand($name,'.exe'))) { |
378 | $type = 'sh'; |
379 | $name = $test unless $test =~ /exe;?\d*$/i; |
380 | } |
381 | elsif (not length($ctype) and # If we've got a lib already, don't bother |
382 | ( -f ($test = VMS::Filespec::rmsexpand($name,$lib_ext)) or |
383 | -f ($test = VMS::Filespec::rmsexpand($name,'.olb')))) { |
384 | $type = 'olb'; |
385 | $name = $test unless $test =~ /olb;?\d*$/i; |
386 | } |
387 | elsif (not length($ctype) and # If we've got a lib already, don't bother |
388 | ( -f ($test = VMS::Filespec::rmsexpand($name,$obj_ext)) or |
389 | -f ($test = VMS::Filespec::rmsexpand($name,'.obj')))) { |
fb73857a |
390 | warn "Note (probably harmless): " |
f3d9a6ba |
391 | ."Plain object file $test found in library list\n"; |
55497cff |
392 | $type = 'obj'; |
393 | $name = $test unless $test =~ /obj;?\d*$/i; |
394 | } |
395 | if (defined $type) { |
396 | $ctype = $type; $cand = $name; |
397 | last if $ctype eq 'sh'; |
398 | } |
399 | } |
400 | if ($ctype) { |
401 | eval '$' . $ctype . "{'$cand'}++"; |
402 | die "Error recording library: $@" if $@; |
fb73857a |
403 | warn "\tFound as $cand (really $test), type $ctype\n" if $verbose > 1; |
55497cff |
404 | next LIB; |
405 | } |
406 | } |
fb73857a |
407 | warn "Note (probably harmless): " |
f3d9a6ba |
408 | ."No library found for $lib\n"; |
55497cff |
409 | } |
410 | |
411 | @libs = sort keys %obj; |
412 | # This has to precede any other CRTLs, so just make it first |
413 | if ($olb{VAXCCURSE}) { |
414 | push(@libs,"$olb{VAXCCURSE}/Library"); |
415 | delete $olb{VAXCCURSE}; |
416 | } |
417 | push(@libs, map { "$_/Library" } sort keys %olb); |
418 | push(@libs, map { "$_/Share" } sort keys %sh); |
419 | $lib = join(' ',@libs); |
09b7f37c |
420 | |
421 | $ldlib = $crtlstr ? "$lib $crtlstr" : $lib; |
422 | warn "Result:\n\tEXTRALIBS: $lib\n\tLDLOADLIBS: $ldlib\n" if $verbose; |
423 | wantarray ? ($lib, '', $ldlib, '') : $lib; |
55497cff |
424 | } |
425 | |
005c1a0e |
426 | 1; |
c2e89b3d |
427 | |
864a5fa8 |
428 | __END__ |
cb1a09d0 |
429 | |
864a5fa8 |
430 | =head1 NAME |
431 | |
432 | ExtUtils::Liblist - determine libraries to use and how to use them |
433 | |
434 | =head1 SYNOPSIS |
435 | |
436 | C<require ExtUtils::Liblist;> |
437 | |
e611f912 |
438 | C<ExtUtils::Liblist::ext($self, $potential_libs, $verbose);> |
864a5fa8 |
439 | |
440 | =head1 DESCRIPTION |
441 | |
442 | This utility takes a list of libraries in the form C<-llib1 -llib2 |
443 | -llib3> and prints out lines suitable for inclusion in an extension |
444 | Makefile. Extra library paths may be included with the form |
445 | C<-L/another/path> this will affect the searches for all subsequent |
446 | libraries. |
447 | |
448 | It returns an array of four scalar values: EXTRALIBS, BSLOADLIBS, |
3e3baf6d |
449 | LDLOADLIBS, and LD_RUN_PATH. Some of these don't mean anything |
450 | on VMS and Win32. See the details about those platform specifics |
451 | below. |
864a5fa8 |
452 | |
453 | Dependent libraries can be linked in one of three ways: |
454 | |
455 | =over 2 |
456 | |
457 | =item * For static extensions |
458 | |
459 | by the ld command when the perl binary is linked with the extension |
460 | library. See EXTRALIBS below. |
461 | |
462 | =item * For dynamic extensions |
463 | |
464 | by the ld command when the shared object is built/linked. See |
465 | LDLOADLIBS below. |
466 | |
467 | =item * For dynamic extensions |
468 | |
469 | by the DynaLoader when the shared object is loaded. See BSLOADLIBS |
470 | below. |
471 | |
472 | =back |
473 | |
474 | =head2 EXTRALIBS |
475 | |
476 | List of libraries that need to be linked with when linking a perl |
477 | binary which includes this extension Only those libraries that |
478 | actually exist are included. These are written to a file and used |
479 | when linking perl. |
480 | |
481 | =head2 LDLOADLIBS and LD_RUN_PATH |
482 | |
483 | List of those libraries which can or must be linked into the shared |
484 | library when created using ld. These may be static or dynamic |
485 | libraries. LD_RUN_PATH is a colon separated list of the directories |
486 | in LDLOADLIBS. It is passed as an environment variable to the process |
487 | that links the shared library. |
488 | |
489 | =head2 BSLOADLIBS |
490 | |
491 | List of those libraries that are needed but can be linked in |
492 | dynamically at run time on this platform. SunOS/Solaris does not need |
493 | this because ld records the information (from LDLOADLIBS) into the |
494 | object file. This list is used to create a .bs (bootstrap) file. |
495 | |
496 | =head1 PORTABILITY |
497 | |
498 | This module deals with a lot of system dependencies and has quite a |
499 | few architecture specific B<if>s in the code. |
500 | |
55497cff |
501 | =head2 VMS implementation |
502 | |
503 | The version of ext() which is executed under VMS differs from the |
504 | Unix-OS/2 version in several respects: |
505 | |
506 | =over 2 |
507 | |
508 | =item * |
509 | |
510 | Input library and path specifications are accepted with or without the |
511 | C<-l> and C<-L> prefices used by Unix linkers. If neither prefix is |
512 | present, a token is considered a directory to search if it is in fact |
513 | a directory, and a library to search for otherwise. Authors who wish |
514 | their extensions to be portable to Unix or OS/2 should use the Unix |
515 | prefixes, since the Unix-OS/2 version of ext() requires them. |
516 | |
517 | =item * |
518 | |
519 | Wherever possible, shareable images are preferred to object libraries, |
520 | and object libraries to plain object files. In accordance with VMS |
521 | naming conventions, ext() looks for files named I<lib>shr and I<lib>rtl; |
522 | it also looks for I<lib>lib and libI<lib> to accomodate Unix conventions |
523 | used in some ported software. |
524 | |
525 | =item * |
526 | |
527 | For each library that is found, an appropriate directive for a linker options |
528 | file is generated. The return values are space-separated strings of |
529 | these directives, rather than elements used on the linker command line. |
530 | |
531 | =item * |
532 | |
09b7f37c |
533 | LDLOADLIBS contains both the libraries found based on C<$potential_libs> and |
534 | the CRTLs, if any, specified in Config.pm. EXTRALIBS contains just those |
535 | libraries found based on C<$potential_libs>. BSLOADLIBS and LD_RUN_PATH |
536 | are always empty. |
55497cff |
537 | |
538 | =back |
539 | |
540 | In addition, an attempt is made to recognize several common Unix library |
541 | names, and filter them out or convert them to their VMS equivalents, as |
542 | appropriate. |
543 | |
544 | In general, the VMS version of ext() should properly handle input from |
545 | extensions originally designed for a Unix or VMS environment. If you |
546 | encounter problems, or discover cases where the search could be improved, |
547 | please let us know. |
548 | |
3e3baf6d |
549 | =head2 Win32 implementation |
550 | |
551 | The version of ext() which is executed under Win32 differs from the |
552 | Unix-OS/2 version in several respects: |
553 | |
554 | =over 2 |
555 | |
556 | =item * |
557 | |
558 | Input library and path specifications are accepted with or without the |
559 | C<-l> and C<-L> prefices used by Unix linkers. C<-lfoo> specifies the |
2d7a9237 |
560 | library C<libfoo.lib> (unless C<foo> already starts with C<lib>), and |
561 | C<-Ls:ome\dir> specifies a directory to look for the libraries that follow. |
562 | If neither prefix is present, a token is considered a directory to search |
563 | if it is in fact a directory, and a library to search for otherwise. The |
564 | C<$Config{lib_ext}> suffix will be appended to any entries that are not |
565 | directories and don't already have the suffix. Authors who wish their |
566 | extensions to be portable to Unix or OS/2 should use the Unix prefixes, |
567 | since the Unix-OS/2 version of ext() requires them. |
3e3baf6d |
568 | |
569 | =item * |
570 | |
571 | Entries cannot be plain object files, as many Win32 compilers will |
572 | not handle object files in the place of libraries. |
573 | |
574 | =item * |
575 | |
576 | If C<$potential_libs> is empty, the return value will be empty. |
577 | Otherwise, the libraries specified by C<$Config{libs}> (see Config.pm) |
578 | will be appended to the list of C<$potential_libs>. The libraries |
579 | will be searched for in the directories specified in C<$potential_libs> |
580 | as well as in C<$Config{libpth}>. For each library that is found, a |
581 | space-separated list of fully qualified library pathnames is generated. |
582 | You may specify an entry that matches C</:nodefault/i> in |
583 | C<$potential_libs> to disable the appending of default libraries |
584 | found in C<$Config{libs}> (this should be only needed very rarely). |
585 | |
586 | =item * |
587 | |
588 | The libraries specified may be a mixture of static libraries and |
589 | import libraries (to link with DLLs). Since both kinds are used |
590 | pretty transparently on the win32 platform, we do not attempt to |
591 | distinguish between them. |
592 | |
593 | =item * |
594 | |
595 | LDLOADLIBS and EXTRALIBS are always identical under Win32, and BSLOADLIBS |
596 | and LD_RUN_PATH are always empty (this may change in future). |
597 | |
598 | =back |
599 | |
600 | |
864a5fa8 |
601 | =head1 SEE ALSO |
602 | |
603 | L<ExtUtils::MakeMaker> |
604 | |
605 | =cut |
606 | |