package ExtUtils::Liblist;
-use vars qw($VERSION);
+
+@ISA = qw(ExtUtils::Liblist::Kid File::Spec);
+
+sub lsdir {
+ shift;
+ my $rex = qr/$_[1]/;
+ opendir my $dir, $_[0];
+ grep /$rex/, readdir $dir;
+}
+
+sub file_name_is_absolute {
+ require File::Spec;
+ shift;
+ 'File::Spec'->file_name_is_absolute(@_);
+}
+
+
+package ExtUtils::Liblist::Kid;
+
+# This kid package is to be used by MakeMaker. It will not work if
+# $self is not a Makemaker.
+
+use 5.006_001;
# Broken out of MakeMaker from version 4.11
-$VERSION = substr q$Revision: 1.25 $, 10;
+our $VERSION = substr q$Revision: 1.27 $, 10;
use Config;
use Cwd 'cwd';
}
sub _unix_os2_ext {
- my($self,$potential_libs, $verbose) = @_;
- if ($^O =~ 'os2' and $Config{libs}) {
+ my($self,$potential_libs, $verbose, $give_libs) = @_;
+ if ($^O =~ 'os2' and $Config{perllibs}) {
# 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};
+ $potential_libs .= $Config{perllibs};
}
- return ("", "", "", "") unless $potential_libs;
- print STDOUT "Potential libraries are '$potential_libs':\n" if $verbose;
+ return ("", "", "", "", ($give_libs ? [] : ())) unless $potential_libs;
+ warn "Potential libraries are '$potential_libs':\n" if $verbose;
my($so) = $Config{'so'};
- my($libs) = $Config{'libs'};
+ my($libs) = $Config{'perllibs'};
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 " ", $Config{'libpth'};
my(@ldloadlibs, @bsloadlibs, @extralibs, @ld_run_path, %ld_run_path_seen);
+ my(@libs, %libs_seen);
my($fullname, $thislib, $thispth, @fullname);
my($pwd) = cwd(); # from Cwd.pm
my($found) = 0;
if ($thislib =~ s/^(-[LR])//){ # save path flag type
my($ptype) = $1;
unless (-d $thislib){
- print STDOUT "$ptype$thislib ignored, directory does not exist\n"
+ warn "$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";
+ warn "Warning: $ptype$thislib changed to $ptype$pwd/$thislib\n";
$thislib = $self->catdir($pwd,$thislib);
}
push(@searchpath, $thislib);
# Handle possible library arguments.
unless ($thislib =~ s/^-l//){
- print STDOUT "Unrecognized argument in LIBS ignored: '$thislib'\n";
+ warn "Unrecognized argument in LIBS ignored: '$thislib'\n";
next;
}
} 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")
+ && (! $Config{'archname'} =~ /RM\d\d\d-svr4/)
&& ($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:/) {
+ && readlink($fullname) =~ /^elink:/s) {
# Some of DG's libraries look like misconnected symbolic
# links, but development tools can follow them. (They
# look like this:
#
# , the compilation tools expand the environment variables.)
} else {
- print STDOUT "$thislib not found in $thispth\n" if $verbose;
+ warn "$thislib not found in $thispth\n" if $verbose;
next;
}
- print STDOUT "'-l$thislib' found at $fullname\n" if $verbose;
+ warn "'-l$thislib' found at $fullname\n" if $verbose;
my($fullnamedir) = dirname($fullname);
push @ld_run_path, $fullnamedir unless $ld_run_path_seen{$fullnamedir}++;
+ push @libs, $fullname unless $libs_seen{$fullname}++;
$found++;
$found_lib++;
# Now update library lists
# what do we know about this library...
- my $is_dyna = ($fullname !~ /\Q$Config_libext\E$/);
+ my $is_dyna = ($fullname !~ /\Q$Config_libext\E\z/);
my $in_perl = ($libs =~ /\B-l\Q$ {thislib}\E\b/s);
# Do not add it into the list if it is already linked in
}
last; # found one here so don't bother looking further
}
- print STDOUT "Note (probably harmless): "
+ warn "Note (probably harmless): "
."No library found for -l$thislib\n"
unless $found_lib>0;
}
- return ('','','','') unless $found;
- ("@extralibs", "@bsloadlibs", "@ldloadlibs",join(":",@ld_run_path));
+ return ('','','','', ($give_libs ? \@libs : ())) unless $found;
+ ("@extralibs", "@bsloadlibs", "@ldloadlibs",join(":",@ld_run_path), ($give_libs ? \@libs : ()));
}
sub _win32_ext {
- my($self, $potential_libs, $verbose) = @_;
+
+ require Text::ParseWords;
+
+ my($self, $potential_libs, $verbose, $give_libs) = @_;
# If user did not supply a list, we punt.
# (caller should probably use the list in $Config{libs})
- return ("", "", "", "") unless $potential_libs;
-
- my($so) = $Config{'so'};
- my($libs) = $Config{'libs'};
- my($libpth) = $Config{'libpth'};
- my($libext) = $Config{'lib_ext'} || ".lib";
+ return ("", "", "", "", ($give_libs ? [] : ())) unless $potential_libs;
+
+ my $cc = $Config{cc};
+ my $VC = 1 if $cc =~ /^cl/i;
+ my $BC = 1 if $cc =~ /^bcc/i;
+ my $GC = 1 if $cc =~ /^gcc/i;
+ my $so = $Config{'so'};
+ my $libs = $Config{'perllibs'};
+ my $libpth = $Config{'libpth'};
+ my $libext = $Config{'lib_ext'} || ".lib";
+ my(@libs, %libs_seen);
if ($libs and $potential_libs !~ /:nodefault/i) {
# If Config.pm defines a set of default libs, we always
$potential_libs .= " " if $potential_libs;
$potential_libs .= $libs;
}
- print STDOUT "Potential libraries are '$potential_libs':\n" if $verbose;
+ warn "Potential libraries are '$potential_libs':\n" if $verbose;
+
+ # normalize to forward slashes
+ $libpth =~ s,\\,/,g;
+ $potential_libs =~ s,\\,/,g;
# compute $extralibs from $potential_libs
- my(@searchpath); # from "-L/path" entries in $potential_libs
- my(@libpath) = split " ", $libpth;
- my(@extralibs);
+ my @searchpath; # from "-L/path" in $potential_libs
+ my @libpath = Text::ParseWords::quotewords('\s+', 0, $libpth);
+ my @extralibs;
+ my $pwd = cwd(); # from Cwd.pm
+ my $lib = '';
+ my $found = 0;
+ my $search = 1;
my($fullname, $thislib, $thispth);
- my($pwd) = cwd(); # from Cwd.pm
- my($lib) = '';
- my($found) = 0;
- foreach $thislib (split ' ', $potential_libs){
+ # add "$Config{installarchlib}/CORE" to default search path
+ push @libpath, "$Config{installarchlib}/CORE";
- # Handle possible linker path arguments.
- if ($thislib =~ s/^-L// and not -d $thislib) {
- print STDOUT "-L$thislib ignored, directory does not exist\n"
+ if ($VC and exists $ENV{LIB} and $ENV{LIB}) {
+ push @libpath, split /;/, $ENV{LIB};
+ }
+
+ foreach (Text::ParseWords::quotewords('\s+', 0, $potential_libs)){
+
+ $thislib = $_;
+
+ # see if entry is a flag
+ if (/^:\w+$/) {
+ $search = 0 if lc eq ':nosearch';
+ $search = 1 if lc eq ':search';
+ warn "Ignoring unknown flag '$thislib'\n"
+ if $verbose and !/^:(no)?(search|default)$/i;
+ next;
+ }
+
+ # if searching is disabled, do compiler-specific translations
+ unless ($search) {
+ s/^-l(.+)$/$1.lib/ unless $GC;
+ s/^-L/-libpath:/ if $VC;
+ push(@extralibs, $_);
+ $found++;
+ next;
+ }
+
+ # handle possible linker path arguments
+ if (s/^-L// and not -d) {
+ warn "$thislib ignored, directory does not exist\n"
if $verbose;
next;
}
- elsif (-d $thislib) {
- unless ($self->file_name_is_absolute($thislib)) {
- print STDOUT "Warning: -L$thislib changed to -L$pwd/$thislib\n";
- $thislib = $self->catdir($pwd,$thislib);
+ elsif (-d) {
+ unless ($self->file_name_is_absolute($_)) {
+ warn "Warning: '$thislib' changed to '-L$pwd/$_'\n";
+ $_ = $self->catdir($pwd,$_);
}
- push(@searchpath, $thislib);
+ push(@searchpath, $_);
next;
}
- # Handle possible library arguments.
- $thislib =~ s/^-l//;
- $thislib .= $libext if $thislib !~ /\Q$libext\E$/i;
+ # handle possible library arguments
+ if (s/^-l// and $GC and !/^lib/i) {
+ $_ = "lib$_";
+ }
+ $_ .= $libext if !/\Q$libext\E$/i;
- my($found_lib)=0;
+ my $secondpass = 0;
+ LOOKAGAIN:
+
+ # look for the file itself
+ if (-f) {
+ warn "'$thislib' found as '$_'\n" if $verbose;
+ $found++;
+ push(@extralibs, $_);
+ next;
+ }
+
+ my $found_lib = 0;
foreach $thispth (@searchpath, @libpath){
- unless (-f ($fullname="$thispth\\$thislib")) {
- print STDOUT "$thislib not found in $thispth\n" if $verbose;
+ unless (-f ($fullname="$thispth\\$_")) {
+ warn "'$thislib' not found as '$fullname'\n" if $verbose;
next;
}
- print STDOUT "'$thislib' found at $fullname\n" if $verbose;
+ warn "'$thislib' found as '$fullname'\n" if $verbose;
$found++;
$found_lib++;
push(@extralibs, $fullname);
+ push @libs, $fullname unless $libs_seen{$fullname}++;
last;
}
- print STDOUT "Note (probably harmless): "
+
+ # do another pass with (or without) leading 'lib' if they used -l
+ if (!$found_lib and $thislib =~ /^-l/ and !$secondpass++) {
+ if ($GC) {
+ goto LOOKAGAIN if s/^lib//i;
+ }
+ elsif (!/^lib/i) {
+ $_ = "lib$_";
+ goto LOOKAGAIN;
+ }
+ }
+
+ # give up
+ warn "Note (probably harmless): "
."No library found for '$thislib'\n"
unless $found_lib>0;
+
}
- return ('','','','') unless $found;
+
+ return ('','','','', ($give_libs ? \@libs : ())) unless $found;
+
+ # make sure paths with spaces are properly quoted
+ @extralibs = map { (/\s/ && !/^".*"$/) ? qq["$_"] : $_ } @extralibs;
+ @libs = map { (/\s/ && !/^".*"$/) ? qq["$_"] : $_ } @libs;
$lib = join(' ',@extralibs);
- print "Result: $lib\n" if $verbose;
- wantarray ? ($lib, '', $lib, '') : $lib;
+
+ # normalize back to backward slashes (to help braindead tools)
+ # XXX this may break equally braindead GNU tools that don't understand
+ # backslashes, either. Seems like one can't win here. Cursed be CP/M.
+ $lib =~ s,/,\\,g;
+
+ warn "Result: $lib\n" if $verbose;
+ wantarray ? ($lib, '', $lib, '', ($give_libs ? \@libs : ())) : $lib;
}
sub _vms_ext {
- my($self, $potential_libs,$verbose) = @_;
- return ('', '', '', '') unless $potential_libs;
+ my($self, $potential_libs,$verbose,$give_libs) = @_;
+ my(@crtls,$crtlstr);
+ my($dbgqual) = $self->{OPTIMIZE} || $Config{'optimize'} ||
+ $self->{CCFLAS} || $Config{'ccflags'};
+ @crtls = ( ($dbgqual =~ m-/Debug-i ? $Config{'dbgprefix'} : '')
+ . 'PerlShr/Share' );
+ push(@crtls, grep { not /\(/ } split /\s+/, $Config{'perllibs'});
+ push(@crtls, grep { not /\(/ } split /\s+/, $Config{'libc'});
+ # In general, we pass through the basic libraries from %Config unchanged.
+ # The one exception is that if we're building in the Perl source tree, and
+ # a library spec could be resolved via a logical name, we go to some trouble
+ # to insure that the copy in the local tree is used, rather than one to
+ # which a system-wide logical may point.
+ if ($self->{PERL_SRC}) {
+ my($lib,$locspec,$type);
+ foreach $lib (@crtls) {
+ if (($locspec,$type) = $lib =~ m-^([\w$\-]+)(/\w+)?- and $locspec =~ /perl/i) {
+ if (lc $type eq '/share') { $locspec .= $Config{'exe_ext'}; }
+ elsif (lc $type eq '/library') { $locspec .= $Config{'lib_ext'}; }
+ else { $locspec .= $Config{'obj_ext'}; }
+ $locspec = $self->catfile($self->{PERL_SRC},$locspec);
+ $lib = "$locspec$type" if -e $locspec;
+ }
+ }
+ }
+ $crtlstr = @crtls ? join(' ',@crtls) : '';
+
+ unless ($potential_libs) {
+ warn "Result:\n\tEXTRALIBS: \n\tLDLOADLIBS: $crtlstr\n" if $verbose;
+ return ('', '', $crtlstr, '', ($give_libs ? [] : ()));
+ }
- my(@dirs,@libs,$dir,$lib,%sh,%olb,%obj);
+ my(@dirs,@libs,$dir,$lib,%found,@fndlibs,$ldlib);
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(@flibs, %libs_seen);
my %libmap = ( 'm' => '', 'f77' => '', 'F77' => '', 'V77' => '', 'c' => '',
'malloc' => '', 'crypt' => '', 'resolv' => '', 'c_s' => '',
'socket' => '', 'X11' => 'DECW$XLIBSHR',
'Xmu' => 'DECW$XMULIBSHR');
if ($Config{'vms_cc_type'} ne 'decc') { $libmap{'curses'} = 'VAXCCURSE'; }
- print STDOUT "Potential libraries are '$potential_libs'\n" if $verbose;
+ warn "Potential libraries are '$potential_libs'\n" if $verbose;
# First, sort out directories and library names in the input
foreach $lib (split ' ',$potential_libs) {
# path in a logical name.)
foreach $dir (@dirs) {
unless (-d $dir) {
- print STDOUT "Skipping nonexistent Directory $dir\n" if $verbose > 1;
+ warn "Skipping nonexistent Directory $dir\n" if $verbose > 1;
$dir = '';
next;
}
- print STDOUT "Resolving directory $dir\n" if $verbose;
+ warn "Resolving directory $dir\n" if $verbose;
if ($self->file_name_is_absolute($dir)) { $dir = $self->fixpath($dir,1); }
else { $dir = $self->catdir($cwd,$dir); }
}
push(@variants,"lib$lib") if $lib !~ /[:>\]]/;
}
push(@variants,$lib);
- print STDOUT "Looking for $lib\n" if $verbose;
+ warn "Looking for $lib\n" if $verbose;
foreach $variant (@variants) {
foreach $dir (@dirs) {
my($type);
$name = "$dir$variant";
- print "\tChecking $name\n" if $verbose > 2;
+ warn "\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) { $type = 'olb'; }
+ if ($test =~ /(?:$so|exe)$/i) { $type = 'SHR'; }
+ elsif ($test =~ /(?:$lib_ext|olb)$/i) { $type = 'OLB'; }
elsif ($test =~ /(?:$obj_ext|obj)$/i) {
- print STDOUT "Note (probably harmless): "
+ warn "Note (probably harmless): "
."Plain object file $test found in library list\n";
- $type = 'obj';
+ $type = 'OBJ';
}
else {
- print STDOUT "Note (probably harmless): "
+ warn "Note (probably harmless): "
."Unknown library type for $test; assuming shared\n";
- $type = 'sh';
+ $type = 'SHR';
}
}
elsif (-f ($test = VMS::Filespec::rmsexpand($name,$so)) or
-f ($test = VMS::Filespec::rmsexpand($name,'.exe'))) {
- $type = 'sh';
+ $type = 'SHR';
$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';
+ $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): "
+ warn "Note (probably harmless): "
."Plain object file $test found in library list\n";
- $type = 'obj';
+ $type = 'OBJ';
$name = $test unless $test =~ /obj;?\d*$/i;
}
if (defined $type) {
$ctype = $type; $cand = $name;
- last if $ctype eq 'sh';
+ last if $ctype eq 'SHR';
}
}
if ($ctype) {
- eval '$' . $ctype . "{'$cand'}++";
- die "Error recording library: $@" if $@;
- print STDOUT "\tFound as $cand (really $test), type $ctype\n" if $verbose > 1;
+ # This has to precede any other CRTLs, so just make it first
+ if ($cand eq 'VAXCCURSE') { unshift @{$found{$ctype}}, $cand; }
+ else { push @{$found{$ctype}}, $cand; }
+ warn "\tFound as $cand (really $test), type $ctype\n" if $verbose > 1;
+ push @flibs, $name unless $libs_seen{$fullname}++;
next LIB;
}
}
- print STDOUT "Note (probably harmless): "
+ warn "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, '') : $lib;
+ push @fndlibs, @{$found{OBJ}} if exists $found{OBJ};
+ push @fndlibs, map { "$_/Library" } @{$found{OLB}} if exists $found{OLB};
+ push @fndlibs, map { "$_/Share" } @{$found{SHR}} if exists $found{SHR};
+ $lib = join(' ',@fndlibs);
+
+ $ldlib = $crtlstr ? "$lib $crtlstr" : $lib;
+ warn "Result:\n\tEXTRALIBS: $lib\n\tLDLOADLIBS: $ldlib\n" if $verbose;
+ wantarray ? ($lib, '', $ldlib, '', ($give_libs ? \@flibs : ())) : $lib;
}
1;
C<require ExtUtils::Liblist;>
-C<ExtUtils::Liblist::ext($self, $potential_libs, $verbose);>
+C<ExtUtils::Liblist::ext($self, $potential_libs, $verbose, $need_names);>
=head1 DESCRIPTION
This utility takes a list of libraries in the form C<-llib1 -llib2
--llib3> and prints out lines suitable for inclusion in an extension
+-llib3> and returns lines suitable for inclusion in an extension
Makefile. Extra library paths may be included with the form
C<-L/another/path> this will affect the searches for all subsequent
libraries.
-It returns an array of four scalar values: EXTRALIBS, BSLOADLIBS,
-LDLOADLIBS, and LD_RUN_PATH. Some of these don't mean anything
-on VMS and Win32. See the details about those platform specifics
-below.
+It returns an array of four or five scalar values: EXTRALIBS,
+BSLOADLIBS, LDLOADLIBS, LD_RUN_PATH, and, optionally, a reference to
+the array of the filenames of actual libraries. Some of these don't
+mean anything unless on Unix. See the details about those platform
+specifics below. The list of the filenames is returned only if
+$need_names argument is true.
Dependent libraries can be linked in one of three ways:
=head2 EXTRALIBS
List of libraries that need to be linked with when linking a perl
-binary which includes this extension Only those libraries that
+binary which includes this extension. Only those libraries that
actually exist are included. These are written to a file and used
when linking perl.
=head1 PORTABILITY
This module deals with a lot of system dependencies and has quite a
-few architecture specific B<if>s in the code.
+few architecture specific C<if>s in the code.
=head2 VMS implementation
=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
+C<-l> and C<-L> prefixes 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
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
+it also looks for I<lib>lib and libI<lib> to accommodate Unix conventions
used in some ported software.
=item *
=item *
-LDLOADLIBS and EXTRALIBS are always identical under VMS, and BSLOADLIBS
-and LD_RIN_PATH are always empty.
+LDLOADLIBS contains both the libraries found based on C<$potential_libs> and
+the CRTLs, if any, specified in Config.pm. EXTRALIBS contains just those
+libraries found based on C<$potential_libs>. BSLOADLIBS and LD_RUN_PATH
+are always empty.
=back
=item *
+If C<$potential_libs> is empty, the return value will be empty.
+Otherwise, the libraries specified by C<$Config{perllibs}> (see Config.pm)
+will be appended to the list of C<$potential_libs>. The libraries
+will be searched for in the directories specified in C<$potential_libs>,
+C<$Config{libpth}>, and in C<$Config{installarchlib}/CORE>.
+For each library that is found, a space-separated list of fully qualified
+library pathnames is generated.
+
+=item *
+
Input library and path specifications are accepted with or without the
-C<-l> and C<-L> prefices used by Unix linkers. C<-lfoo> specifies the
-library C<foo.lib> and C<-Ls:ome\dir> specifies a directory to look for
-the libraries that follow. If neither prefix is present, a token is
+C<-l> and C<-L> prefixes used by Unix linkers.
+
+An entry of the form C<-La:\foo> specifies the C<a:\foo> directory to look
+for the libraries that follow.
+
+An entry of the form C<-lfoo> specifies the library C<foo>, which may be
+spelled differently depending on what kind of compiler you are using. If
+you are using GCC, it gets translated to C<libfoo.a>, but for other win32
+compilers, it becomes C<foo.lib>. If no files are found by those translated
+names, one more attempt is made to find them using either C<foo.a> or
+C<libfoo.lib>, depending on whether GCC or some other win32 compiler is
+being used, respectively.
+
+If neither the C<-L> or C<-l> prefix is present in an entry, the entry is
considered a directory to search if it is in fact a directory, and a
library to search for otherwise. The C<$Config{lib_ext}> suffix will
-be appended to any entries that are not directories and don't already
-have the suffix. Authors who wish their extensions to be portable to
-Unix or OS/2 should use the Unix prefixes, since the Unix-OS/2 version
-of ext() requires them.
+be appended to any entries that are not directories and don't already have
+the suffix.
+
+Note that the C<-L> and C<-l> prefixes are B<not required>, but authors
+who wish their extensions to be portable to Unix or OS/2 should use the
+prefixes, since the Unix-OS/2 version of ext() requires them.
=item *
=item *
-If C<$potential_libs> is empty, the return value will be empty.
-Otherwise, the libraries specified by C<$Config{libs}> (see Config.pm)
-will be appended to the list of C<$potential_libs>. The libraries
-will be searched for in the directories specified in C<$potential_libs>
-as well as in C<$Config{libpth}>. For each library that is found, a
-space-separated list of fully qualified library pathnames is generated.
-You may specify an entry that matches C</:nodefault/i> in
-C<$potential_libs> to disable the appending of default libraries
-found in C<$Config{libs}> (this should be only needed very rarely).
+Entries in C<$potential_libs> beginning with a colon and followed by
+alphanumeric characters are treated as flags. Unknown flags will be ignored.
+
+An entry that matches C</:nodefault/i> disables the appending of default
+libraries found in C<$Config{perllibs}> (this should be only needed very rarely).
+
+An entry that matches C</:nosearch/i> disables all searching for
+the libraries specified after it. Translation of C<-Lfoo> and
+C<-lfoo> still happens as appropriate (depending on compiler being used,
+as reflected by C<$Config{cc}>), but the entries are not verified to be
+valid files or directories.
+
+An entry that matches C</:search/i> reenables searching for
+the libraries specified after it. You can put it at the end to
+enable searching for default libraries specified by C<$Config{perllibs}>.
=item *
The libraries specified may be a mixture of static libraries and
import libraries (to link with DLLs). Since both kinds are used
-pretty transparently on the win32 platform, we do not attempt to
+pretty transparently on the Win32 platform, we do not attempt to
distinguish between them.
=item *
LDLOADLIBS and EXTRALIBS are always identical under Win32, and BSLOADLIBS
and LD_RUN_PATH are always empty (this may change in future).
+=item *
+
+You must make sure that any paths and path components are properly
+surrounded with double-quotes if they contain spaces. For example,
+C<$potential_libs> could be (literally):
+
+ "-Lc:\Program Files\vc\lib" msvcrt.lib "la test\foo bar.lib"
+
+Note how the first and last entries are protected by quotes in order
+to protect the spaces.
+
+=item *
+
+Since this module is most often used only indirectly from extension
+C<Makefile.PL> files, here is an example C<Makefile.PL> entry to add
+a library to the build process for an extension:
+
+ LIBS => ['-lgl']
+
+When using GCC, that entry specifies that MakeMaker should first look
+for C<libgl.a> (followed by C<gl.a>) in all the locations specified by
+C<$Config{libpth}>.
+
+When using a compiler other than GCC, the above entry will search for
+C<gl.lib> (followed by C<libgl.lib>).
+
+If the library happens to be in a location not in C<$Config{libpth}>,
+you need:
+
+ LIBS => ['-Lc:\gllibs -lgl']
+
+Here is a less often used example:
+
+ LIBS => ['-lgl', ':nosearch -Ld:\mesalibs -lmesa -luser32']
+
+This specifies a search for library C<gl> as before. If that search
+fails to find the library, it looks at the next item in the list. The
+C<:nosearch> flag will prevent searching for the libraries that follow,
+so it simply returns the value as C<-Ld:\mesalibs -lmesa -luser32>,
+since GCC can use that value as is with its linker.
+
+When using the Visual C compiler, the second item is returned as
+C<-libpath:d:\mesalibs mesa.lib user32.lib>.
+
+When using the Borland compiler, the second item is returned as
+C<-Ld:\mesalibs mesa.lib user32.lib>, and MakeMaker takes care of
+moving the C<-Ld:\mesalibs> to the correct place in the linker
+command line.
+
=back
projects / p5sagit/p5-mst-13.2.git / blobdiff