newlib/winsup/cygwin/speclib

#!/usr/bin/perl
use Getopt::Long;
use File::Temp qw'tempdir';
use File::Basename;
use Cwd;
use strict;

sub dllname($;$);

my $static;
my $exclude;

GetOptions('static!'=>\$static, 'v|exclude!'=>\$exclude);

my $nm = shift;
my $ar = shift;
my $libdll = Cwd::abs_path(shift @ARGV);
my $lib = Cwd::abs_path(pop @ARGV);

open my $nm_fd, '-|', $nm, '-Ap', '--defined-only', @ARGV, $libdll or
  die "$0: execution of $nm for object files failed - $!\n";

my %match_syms = ();
my $symfiles = ();
my $lastfn;
my %extract = ();
while (<$nm_fd>) {
    study;
    m%^\Q$libdll\E:([^:]*):\d+ i \.idata\$([56])% and do {
	next;
    };
    m%^\Q$libdll\E:[^:]*:\d+ I (__head_.*)$% and do {
	next;
    };
    next unless m%^([^:]*):([^:]*(?=:))?.* [DTI] (.*)%o;
    if ($1 ne $libdll) {
	 $match_syms{$3} = 1;
     } elsif ($match_syms{$3} ? !$exclude : $exclude) {
	 $extract{$2} = 1;
     }
}
close $nm_fd;

%extract or die "$0: couldn't find symbols for $lib\n";

my $dir = tempdir(CLEANUP => 1);

chdir $dir;
# print join(' ', '+', $ar, 'x', sort keys %extract), "\n";
my $res = system $ar, 'x', $libdll, sort keys %extract;
die "$0: $ar extraction exited with non-zero status\n" if $res;
unlink $lib;
exec $ar, 'crus', $lib, sort keys %extract;