* dllfixdbg: New perl script.

* configure.in: Detect objcopy, objdump, strip.
* configure: Regenerate.
* Makefile.in: Pass target objcopy/objdump to new dllfixdbg script.  Remove
previous perl check.
* cygwin.sc: Add .gnu_debuglink_overlay section for eventual replacement with
.gnu_debuglink section.  Revert move of cygheap to end of image.

winsup/cygwin/dllfixdbg

@@ -0,0 +1,65 @@
+#!/usr/bin/perl
+use integer;
+use strict;
+sub xit($@);
+my $strip = $ARGV[0] eq '-s';
+shift if $strip;
+my $objdump = shift;
+my @objcopy = ((shift));
+my $dll = shift;
+my $dbg = shift;
+xit 0, @objcopy, '--only-keep-debug', $dll, $dbg;
+xit 0, @objcopy, '-g', '--add-gnu-debuglink=' . $dbg, $dll;
+open(OBJDUMP, '-|', "$objdump --headers $dll");
+my %section;
+while (<OBJDUMP>) {
+    my ($idx, $name, $size, $vma, $lma, $fileoff, $algn) = /^\s*(\d+)\s+(\.\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s*$/;
+    if ($name eq '.gnu_debuglink') {
+	push(@objcopy, '--set-section-flag', '.gnu_debuglink=contents,readonly,debug,noload');
+    } elsif ($name eq '.gnu_debuglink_overlay') {
+	push (@objcopy, '-R', '.gnu_debuglink_overlay');
+	$section{'.gnu_debuglink'}{-idx} = $idx if $section{'.gnu_debuglink'};
+	next;
+    }
+    defined($idx) and
+      $section{$name} = {-idx=>int($idx), -size=>hex($size), -vma=>hex($vma), -lma=>hex($lma), -fileoff=>hex($fileoff),
+	  -algn=>0x00001000};
+}
+close OBJDUMP;
+my $vma;
+for my $k (sort {$section{$a}{-idx} <=> $section{$b}{-idx}} keys %section) {
+    if ($strip && $k =~ /\.(?:stab|debug)/o) {
+	push(@objcopy, '-R', $k);
+	next;
+    }
+    if (!defined($vma)) {
+	$vma = $section{$k}{-vma};
+    }
+    if ($vma != $section{$k}{-vma}) {
+        my $newvma = align($vma, $section{$k}{-algn});
+	if ($newvma != $vma) {
+	    printf STDERR "$0: ERROR $k VMA 0x%08x != 0x%08x\n", $vma, $newvma;
+	    exit 1;
+	}
+	push(@objcopy, '--change-section-address', sprintf "$k=0x%08x", $vma);
+    }
+    $vma = align($vma + $section{$k}{-size}, $section{$k}{-algn});
+}
+warn "$0: ERROR final VMA (" . sprintf("0x%08x", $vma) . ") not on 64K boundary\n" if $vma != align($vma, 64 * 1024);
+push(@objcopy, $dll, @ARGV);
+xit 1, @objcopy;
+sub align {
+    my $n = $_[0];
+    my $align = $_[1] - 1;
+    return ($n + $align) & ~$align;
+}
+
+sub xit($@) {
+    my $execit = shift;
+    print "+ @_\n";
+    if ($execit) {
+	exec @_ or die "$0: couldn't exec $_[0] - $!\n";
+    } else {
+	system @_ and die "$0: couldn't exec $_[0] - $!\n";
+    }
+}