Merge branch feature/jorgen.lind/usecmaketocheckforsyncfs with...

Merge branch feature/jorgen.lind/usecmaketocheckforsyncfs with refs/heads/master into refs/merge-requests/73/train

src/OpenVDS/CMakeLists.txt

@@ -178,6 +178,17 @@ if (WIN32)
   set_source_files_properties(IO/Linux_File.cpp PROPERTIES HEADER_FILE_ONLY TRUE)
 elseif (UNIX)
   set_source_files_properties(IO/Win_File.cpp PROPERTIES HEADER_FILE_ONLY TRUE)
+
+  set(CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
+  check_symbol_exists(syncfs "unistd.h" HAVE_SYNCFS)
+  set(CMAKE_REQUIRED_DEFINITIONS "")
+
+  if (HAVE_SYNCFS)
+    set_source_files_properties(IO/Linux_File.cpp
+      PROPERTIES COMPILE_DEFINITIONS
+      HAVE_SYNCFS
+    )
+  endif()
 endif()
 
 if (CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)

src/OpenVDS/IO/Linux_File.cpp

@@ -17,8 +17,8 @@
 
 #include "File.h"
 
-#ifndef _XOPEN_SOURCE
-  #define _XOPEN_SOURCE 500
+#ifdef HAVE_SYNCFS
+  #define _GNU_SOURCE
 #endif
 
 #include <sys/mman.h>
@@ -332,9 +332,9 @@ bool File::Write(const void* pxData, int64_t nOffset, int32_t nLength, Error & e
 
 bool File::Flush()
 {
-#ifdef LINUX
-  int fd  = (int)(intptr_t)_pxPlatformHandle;
-  return syncfs(fd) == 0;
+#ifdef HAVE_SYNCFS
+	int fd  = (int)(intptr_t)_pxPlatformHandle;
+	return syncfs(fd) == 0;
 #else
   sync();
   return true;