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package ExtUtils::Liblist;
use vars qw($VERSION);
# Broken out of MakeMaker from version 4.11
$VERSION = substr q$Revision: 1.20 $, 10;
use Config;
use Cwd 'cwd';
use File::Basename;
my $Config_libext = $Config{lib_ext} || ".a";
sub ext {
my($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'};
# 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,"^lib$thislib\.$so\.[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 $found;
("@extralibs", "@bsloadlibs", "@ldloadlibs",join(":",@ld_run_path));
}
1;
__END__
=head1 NAME
ExtUtils::Liblist - determine libraries to use and how to use them
=head1 SYNOPSIS
C<require ExtUtils::Liblist;>
C<ExtUtils::Liblist::ext($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.
=head1 SEE ALSO
L<ExtUtils::MakeMaker>
=cut
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