[newlib-cygwin] Cygwin: dllfixdbg: create .gnu_debuglink section in the right spot

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=98d10e5fd2868d0d9ec9117f832a63f8ae75d75b

commit 98d10e5fd2868d0d9ec9117f832a63f8ae75d75b
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Mon Nov 15 13:32:03 2021 +0100

    Cygwin: dllfixdbg: create .gnu_debuglink section in the right spot
    
    A recent change in binutils marks the .gnu_debuglink_overlay section
    as debug section.  When dllfixdbg calls objcopy -g, the section
    is removed and the --add-gnu-debuglink option on the same command line
    appends the section consequentially at the end of the sections.
    This in turn breaks Windows Version info and, potentially, raising
    the cygheap size at runtime.
    
    Fix this by adding an explicit --keep-section=.gnu_debuglink_overlay
    to the objcopy command line.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/dllfixdbg     | 2 +-
 winsup/cygwin/release/3.3.3 | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/winsup/cygwin/dllfixdbg b/winsup/cygwin/dllfixdbg
index 70a496584..a2f1210fd 100755
--- a/winsup/cygwin/dllfixdbg
+++ b/winsup/cygwin/dllfixdbg
@@ -16,7 +16,7 @@ my @objcopy = ((shift));
 my $dll = shift;
 my $dbg = shift;
 xit 0, @objcopy, '-R', '.gnu_debuglink_overlay', '--add-gnu-debuglink=/dev/null', '--only-keep-debug', $dll, $dbg;
-xit 0, @objcopy, '-g', '--add-gnu-debuglink=' . $dbg, $dll;
+xit 0, @objcopy, '-g', '--keep-section=.gnu_debuglink_overlay', '--add-gnu-debuglink=' . $dbg, $dll;
 open(OBJDUMP, '-|', "$objdump --headers $dll");
 my %section;
 while (<OBJDUMP>) {
diff --git a/winsup/cygwin/release/3.3.3 b/winsup/cygwin/release/3.3.3
index d04265181..2ad28d465 100644
--- a/winsup/cygwin/release/3.3.3
+++ b/winsup/cygwin/release/3.3.3
@@ -9,3 +9,6 @@ Bug Fixes
   fstatat and other ...at calls.  "X:/" still is handled as absolute
   path.
   Addresses: https://cygwin.com/pipermail/cygwin/2021-November/249837.html
+
+- Fix showing DLL version info from native Windows tools.
+  Addresses: https://cygwin.com/pipermail/cygwin/2021-November/249867.html