[win] Don't build a custom nanosleep() when not needed

CMakeLists.txt

@@ -207,9 +207,6 @@ if(WIN32)
     find_package(dlfcn-win32 REQUIRED)
     set(CMAKE_DL_LIBS dlfcn-win32::dl)
   endif()
-  if(MINGW)
-    string(REPLACE "iconv" "pthread" MLT_PTHREAD_LIBS "${Iconv_LIBRARY}")
-  endif()
 endif()
 
 find_package(SDL2)

src/framework/CMakeLists.txt

@@ -107,11 +107,19 @@ set_target_properties(mlt PROPERTIES
 
 if(WIN32)
   if(MINGW)
-    target_link_libraries(mlt PRIVATE ${MLT_PTHREAD_LIBS})
     target_link_options(mlt PRIVATE -Wl,--output-def,${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/libmlt-${MLT_VERSION_MAJOR}.def)
     install(FILES "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/libmlt-${MLT_VERSION_MAJOR}.def" DESTINATION ${CMAKE_INSTALL_LIBDIR})
   endif()
+
+  include(CheckSymbolExists)
+  set(CMAKE_REQUIRED_LIBRARIES Threads::Threads)
+  check_symbol_exists(nanosleep "pthread.h;pthread_time.h" HAVE_PTHREAD_NANOSLEEP)
+  unset(CMAKE_REQUIRED_LIBRARIES)
+
   target_sources(mlt PRIVATE ../win32/win32.c)
+  set_source_files_properties(../win32/win32.c PROPERTIES
+    COMPILE_DEFINITIONS "HAVE_PTHREAD_NANOSLEEP=${HAVE_PTHREAD_NANOSLEEP}")
+
   target_link_libraries(mlt PRIVATE Iconv::Iconv)
   if(NOT WINDOWS_DEPLOY)
     target_compile_definitions(mlt PRIVATE NODEPLOY)

src/framework/mlt_types.h

@@ -2,7 +2,7 @@
  * \file mlt_types.h
  * \brief Provides forward definitions of all public types
  *
- * Copyright (C) 2003-2025 Meltytech, LLC
+ * Copyright (C) 2003-2023 Meltytech, LLC
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -22,6 +22,10 @@
 #ifndef MLT_TYPES_H
 #define MLT_TYPES_H
 
+#ifndef GCC_VERSION
+#define GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif

src/melt/CMakeLists.txt

@@ -7,12 +7,12 @@ target_link_libraries(melt PRIVATE mlt Threads::Threads)
 target_compile_definitions(melt PRIVATE VERSION="${MLT_VERSION}")
 
 if(SDL2_FOUND AND NOT ANDROID)
-    target_link_libraries(melt PRIVATE SDL2::SDL2)
     target_compile_definitions(melt PRIVATE HAVE_SDL2)
     if(MINGW)
-        target_link_libraries(melt PRIVATE ${MLT_PTHREAD_LIBS})
         target_compile_definitions(melt PRIVATE main=SDL_main)
-        target_link_libraries(melt PRIVATE mingw32 SDL2main SDL2)
+        target_link_libraries(melt PRIVATE mingw32 SDL2::SDL2main SDL2::SDL2)
+    else()
+        target_link_libraries(melt PRIVATE SDL2::SDL2)
     endif()
 endif()
 

src/modules/avformat/CMakeLists.txt

@@ -46,9 +46,6 @@ endif()
 
 if(WIN32)
   target_compile_definitions(mltavformat PRIVATE AVDATADIR="share/ffmpeg/")
-  if(MINGW)
-    target_link_libraries(mltavformat PRIVATE ${MLT_PTHREAD_LIBS})
-  endif()
 endif()
 
 if(CPU_MMX)

src/modules/sdl2/CMakeLists.txt

@@ -20,10 +20,6 @@ else()
   target_link_libraries(mltsdl2 PRIVATE m)
 endif()
 
-if(MINGW)
-  target_link_libraries(mltsdl2 PRIVATE ${MLT_PTHREAD_LIBS})
-endif()
-
 set_target_properties(mltsdl2 PROPERTIES LIBRARY_OUTPUT_DIRECTORY "${MLT_MODULE_OUTPUT_DIRECTORY}")
 
 install(TARGETS mltsdl2 LIBRARY DESTINATION ${MLT_INSTALL_MODULE_DIR})

src/win32/win32.c

@@ -46,16 +46,16 @@ int usleep(unsigned int useconds)
 	return 0;
 }
 
-#ifndef WIN_PTHREADS_TIME_H
-int nanosleep(const struct timespec * rqtp, struct timespec * rmtp)
+#if !HAVE_PTHREAD_NANOSLEEP
+int nanosleep( const struct timespec * rqtp, struct timespec * rmtp )
 {
 	if (rqtp->tv_nsec > 999999999) {
 		/* The time interval specified 1,000,000 or more microseconds. */
 		errno = EINVAL;
 		return -1;
 	}
-    return usleep(rqtp->tv_sec * 1000000 + rqtp->tv_nsec / 1000);
-}
+	return usleep( rqtp->tv_sec * 1000000 + rqtp->tv_nsec / 1000 );
+} 
 #endif
 
 int setenv(const char *name, const char *value, int overwrite)