1 package ExtUtils::Liblist;
3 # Broken out of MakeMaker from version 4.11
9 my $Config_libext = $Config{lib_ext} || ".a";
12 my($potential_libs, $Verbose) = @_;
13 if ($Config{'osname'} eq 'os2' and $Config{libs}) {
14 # Dynamic libraries are not transitive, so we may need including
15 # the libraries linked against perl.dll again.
17 $potential_libs .= " " if $potential_libs;
18 $potential_libs .= $Config{libs};
20 return ("", "", "", "") unless $potential_libs;
21 print STDOUT "Potential libraries are '$potential_libs':\n" if $Verbose;
23 my($so) = $Config{'so'};
24 my($libs) = $Config{'libs'};
26 # compute $extralibs, $bsloadlibs and $ldloadlibs from
28 # this is a rewrite of Andy Dougherty's extliblist in perl
29 # its home is in <distribution>/ext/util
31 my(@searchpath); # from "-L/path" entries in $potential_libs
32 my(@libpath) = split " ", $Config{'libpth'};
33 my(@ldloadlibs, @bsloadlibs, @extralibs, @ld_run_path, %ld_run_path_seen);
34 my($fullname, $thislib, $thispth, @fullname);
35 my($pwd) = fastcwd(); # from Cwd.pm
38 foreach $thislib (split ' ', $potential_libs){
40 # Handle possible linker path arguments.
41 if ($thislib =~ s/^(-[LR])//){ # save path flag type
44 print STDOUT "$ptype$thislib ignored, directory does not exist\n"
48 if ($thislib !~ m|^/|) {
49 print STDOUT "Warning: $ptype$thislib changed to $ptype$pwd/$thislib\n";
50 $thislib = "$pwd/$thislib";
52 push(@searchpath, $thislib);
53 push(@extralibs, "$ptype$thislib");
54 push(@ldloadlibs, "$ptype$thislib");
58 # Handle possible library arguments.
59 unless ($thislib =~ s/^-l//){
60 print STDOUT "Unrecognized argument in LIBS ignored: '$thislib'\n";
65 foreach $thispth (@searchpath, @libpath){
67 # Try to find the full name of the library. We need this to
68 # determine whether it's a dynamically-loadable library or not.
69 # This tends to be subject to various os-specific quirks.
70 # For gcc-2.6.2 on linux (March 1995), DLD can not load
71 # .sa libraries, with the exception of libm.sa, so we
72 # deliberately skip them.
73 if (@fullname = lsdir($thispth,"^lib$thislib\.$so\.[0-9]+")){
74 # Take care that libfoo.so.10 wins against libfoo.so.9.
75 # Compare two libraries to find the most recent version
76 # number. E.g. if you have libfoo.so.9.0.7 and
77 # libfoo.so.10.1, first convert all digits into two
78 # decimal places. Then we'll add ".00" to the shorter
79 # strings so that we're comparing strings of equal length
80 # Thus we'll compare libfoo.so.09.07.00 with
81 # libfoo.so.10.01.00. Some libraries might have letters
82 # in the version. We don't know what they mean, but will
83 # try to skip them gracefully -- we'll set any letter to
84 # '0'. Finally, sort in reverse so we can take the
87 #TODO: iterate through the directory instead of sorting
89 $fullname = "$thispth/" .
93 $ma =~ s/\b(\d)\b/0$1/g;
95 $mb =~ s/\b(\d)\b/0$1/g;
96 while (length($ma) < length($mb)) { $ma .= ".00"; }
97 while (length($mb) < length($ma)) { $mb .= ".00"; }
98 # Comparison deliberately backwards
99 $mb cmp $ma;} @fullname)[0];
100 } elsif (-f ($fullname="$thispth/lib$thislib.$so")
101 && (($Config{'dlsrc'} ne "dl_dld.xs") || ($thislib eq "m"))){
102 } elsif (-f ($fullname="$thispth/lib${thislib}_s$Config_libext")
103 && ($thislib .= "_s") ){ # we must explicitly use _s version
104 } elsif (-f ($fullname="$thispth/lib$thislib$Config_libext")){
105 } elsif (-f ($fullname="$thispth/$thislib$Config_libext")){
106 } elsif (-f ($fullname="$thispth/Slib$thislib$Config_libext")){
108 print STDOUT "$thislib not found in $thispth\n" if $Verbose;
111 print STDOUT "'-l$thislib' found at $fullname\n" if $Verbose;
112 my($fullnamedir) = dirname($fullname);
113 push @ld_run_path, $fullnamedir unless $ld_run_path_seen{$fullnamedir}++;
117 # Now update library lists
119 # what do we know about this library...
120 my $is_dyna = ($fullname !~ /\Q$Config_libext\E$/);
121 my $in_perl = ($libs =~ /\B-l\Q$ {thislib}\E\b/s);
123 # Do not add it into the list if it is already linked in
124 # with the main perl executable.
125 # We have to special-case the NeXT, because all the math
126 # is also in libsys_s
128 ($Config{'osname'} eq 'next' && $thislib eq 'm') ){
129 push(@extralibs, "-l$thislib");
132 # We might be able to load this archive file dynamically
133 if ( $Config{'dlsrc'} =~ /dl_next|dl_dld/){
134 # We push -l$thislib instead of $fullname because
135 # it avoids hardwiring a fixed path into the .bs file.
136 # Mkbootstrap will automatically add dl_findfile() to
137 # the .bs file if it sees a name in the -l format.
138 # USE THIS, when dl_findfile() is fixed:
139 # push(@bsloadlibs, "-l$thislib");
140 # OLD USE WAS while checking results against old_extliblist
141 push(@bsloadlibs, "$fullname");
144 # For SunOS4, do not add in this shared library if
145 # it is already linked in the main perl executable
146 push(@ldloadlibs, "-l$thislib")
147 unless ($in_perl and $Config{'osname'} eq 'sunos');
149 push(@ldloadlibs, "-l$thislib");
152 last; # found one here so don't bother looking further
154 print STDOUT "Warning (will try anyway): No library found for -l$thislib\n"
157 return ('','','','') unless $found;
158 ("@extralibs", "@bsloadlibs", "@ldloadlibs",join(":",@ld_run_path));
161 sub lsdir { #yes, duplicate code seems less hassle than having an
162 #extra file with only lsdir
163 my($dir, $regex) = @_;
165 opendir(DIR, $dir || ".") or return ();
168 @ls = grep(/$regex/, @ls) if $regex;
176 ExtUtils::Liblist - determine libraries to use and how to use them
180 C<require ExtUtils::Liblist;>
182 C<ExtUtils::Liblist::ext($potential_libs, $Verbose);>
186 This utility takes a list of libraries in the form C<-llib1 -llib2
187 -llib3> and prints out lines suitable for inclusion in an extension
188 Makefile. Extra library paths may be included with the form
189 C<-L/another/path> this will affect the searches for all subsequent
192 It returns an array of four scalar values: EXTRALIBS, BSLOADLIBS,
193 LDLOADLIBS, and LD_RUN_PATH.
195 Dependent libraries can be linked in one of three ways:
199 =item * For static extensions
201 by the ld command when the perl binary is linked with the extension
202 library. See EXTRALIBS below.
204 =item * For dynamic extensions
206 by the ld command when the shared object is built/linked. See
209 =item * For dynamic extensions
211 by the DynaLoader when the shared object is loaded. See BSLOADLIBS
218 List of libraries that need to be linked with when linking a perl
219 binary which includes this extension Only those libraries that
220 actually exist are included. These are written to a file and used
223 =head2 LDLOADLIBS and LD_RUN_PATH
225 List of those libraries which can or must be linked into the shared
226 library when created using ld. These may be static or dynamic
227 libraries. LD_RUN_PATH is a colon separated list of the directories
228 in LDLOADLIBS. It is passed as an environment variable to the process
229 that links the shared library.
233 List of those libraries that are needed but can be linked in
234 dynamically at run time on this platform. SunOS/Solaris does not need
235 this because ld records the information (from LDLOADLIBS) into the
236 object file. This list is used to create a .bs (bootstrap) file.
240 This module deals with a lot of system dependencies and has quite a
241 few architecture specific B<if>s in the code.
245 L<ExtUtils::MakeMaker>