[newlib-cygwin/cygwin-3_6-branch] Cygwin: Don't increment DLL reference count in dladdr.

[Jeremy Drake]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=3336fb8cb7901e4bf8bf36cabcee030233941edf

commit 3336fb8cb7901e4bf8bf36cabcee030233941edf
Author: Jeremy Drake <cygwin@jdrake.com>
Date:   Sat Apr 5 10:17:40 2025 -0700

    Cygwin: Don't increment DLL reference count in dladdr.
    
    Unlike GetModuleHandle, GetModuleHandleEx increments the reference count
    by default unless the GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT flag
    is passed.
    
    Fixes: c8432a01c840 ("Implement dladdr() (partially)")
    Addresses: https://cygwin.com/pipermail/cygwin/2025-April/257864.html
    Signed-off-by: Jeremy Drake <cygwin@jdrake.com>
    (cherry picked from commit 97f9ef33704a109b7a48bffacfdb03e47dce9cf5)

Diff:
---
 winsup/cygwin/dlfcn.cc      | 3 ++-
 winsup/cygwin/release/3.6.1 | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/winsup/cygwin/dlfcn.cc b/winsup/cygwin/dlfcn.cc
index f029ebbf2..10bd0ac1f 100644
--- a/winsup/cygwin/dlfcn.cc
+++ b/winsup/cygwin/dlfcn.cc
@@ -408,7 +408,8 @@ extern "C" int
 dladdr (const void *addr, Dl_info *info)
 {
   HMODULE hModule;
-  BOOL ret = GetModuleHandleEx (GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
+  BOOL ret = GetModuleHandleEx (GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT|
+				GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
 				(LPCSTR) addr,
 				&hModule);
   if (!ret)
diff --git a/winsup/cygwin/release/3.6.1 b/winsup/cygwin/release/3.6.1
index c09a23376..280952c91 100644
--- a/winsup/cygwin/release/3.6.1
+++ b/winsup/cygwin/release/3.6.1
@@ -36,3 +36,6 @@ Fixes:
   subprocess failure in cmake (>= 3.29.x).
   Addresses: https://cygwin.com/pipermail/cygwin/2025-March/257800.html
   Addresses: https://github.com/msys2/msys2-runtime/issues/272
+
+- Don't increment DLL reference count in dladdr.
+  Addresses: https://cygwin.com/pipermail/cygwin/2025-April/257862.html