From 244c84e4c2ce7a0458a2ff0fd17a53e1f9c878df Mon Sep 17 00:00:00 2001
From: Carlo Bramini <30959007+carlo-bramini@users.noreply.github.com>
Date: Wed, 11 Feb 2026 09:43:18 +0100
Subject: [PATCH 1/3] [MESON] Add support for CYGWIN platform

---
 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meson.build b/meson.build
index a0dfd2196..0ceb55c77 100644
--- a/meson.build
+++ b/meson.build
@@ -112,7 +112,7 @@ if ['linux', 'freebsd', 'android', 'ios', 'darwin'].contains(system)
   if ['ios', 'darwin', 'android'].contains(system)
     cpp_lib = '-lc++'
   endif
-elif system == 'windows'
+elif ['windows', 'cygwin'].contains(system)
   if cpu_family == 'x86'
     asm_format = 'win32'
     asm_args += ['-DPREFIX', '-DX86_32']

From 7c4c2db64c1fe23ddb517ddb44728ed8ee27beff Mon Sep 17 00:00:00 2001
From: Carlo Bramini <30959007+carlo-bramini@users.noreply.github.com>
Date: Wed, 11 Feb 2026 10:30:55 +0100
Subject: [PATCH 2/3] WIN32: ReleaseSemaphore() needs LONG rather than long.

---
 codec/decoder/core/src/wels_decoder_thread.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/codec/decoder/core/src/wels_decoder_thread.cpp b/codec/decoder/core/src/wels_decoder_thread.cpp
index fdf4b4d70..a607f9e1a 100644
--- a/codec/decoder/core/src/wels_decoder_thread.cpp
+++ b/codec/decoder/core/src/wels_decoder_thread.cpp
@@ -115,7 +115,10 @@ int SemWait (SWelsDecSemphore* s, int32_t timeout) {
 }
 
 void SemRelease (SWelsDecSemphore* s, long* prevcount) {
-  ReleaseSemaphore (s->h, 1, prevcount);
+  LONG _prevcount;
+
+  ReleaseSemaphore (s->h, 1, &_prevcount);
+  *prevcount = _prevcount;
 }
 
 void SemDestroy (SWelsDecSemphore* s) {

From 74f2a54a8ee95fccde7eb98c04daa4ef89b81837 Mon Sep 17 00:00:00 2001
From: Carlo Bramini <30959007+carlo-bramini@users.noreply.github.com>
Date: Wed, 11 Feb 2026 10:28:24 +0100
Subject: [PATCH 3/3] CYGWIN: don't use _alloca() for adding stack space.

---
 codec/decoder/plus/src/welsDecoderExt.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/codec/decoder/plus/src/welsDecoderExt.cpp b/codec/decoder/plus/src/welsDecoderExt.cpp
index 08e037a3d..445978641 100644
--- a/codec/decoder/plus/src/welsDecoderExt.cpp
+++ b/codec/decoder/plus/src/welsDecoderExt.cpp
@@ -90,7 +90,7 @@ namespace WelsDec {
 ***************************************************************************/
 DECLARE_PROCTHREAD (pThrProcInit, p) {
   SWelsDecThreadInfo* sThreadInfo = (SWelsDecThreadInfo*)p;
-#if defined(WIN32)
+#if defined(WIN32) && !defined(__CYGWIN__)
   _alloca (WELS_DEC_MAX_THREAD_STACK_SIZE * (sThreadInfo->uiThrNum + 1));
 #endif
   return sThreadInfo->pThrProcMain (p);