cmake: Check for io.h on Windows

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>

ConfigureChecks.cmake

@@ -65,6 +65,8 @@ check_include_file(arpa/inet.h HAVE_ARPA_INET_H)
 check_include_file(byteswap.h HAVE_BYTESWAP_H)
 
 if (WIN32)
+  check_include_file(io.h HAVE_IO_H)
+
   check_include_files("winsock2.h;ws2tcpip.h;wspiapi.h" HAVE_WSPIAPI_H)
   if (NOT HAVE_WSPIAPI_H)
     message(STATUS "WARNING: Without wspiapi.h, this build will only work on Windows XP and newer versions")

config.h.cmake

@@ -38,6 +38,9 @@
 /* Define to 1 if you have the <sys/utime.h> header file. */
 #cmakedefine HAVE_SYS_UTIME_H 1
 
+/* Define to 1 if you have the <io.h> header file. */
+#cmakedefine HAVE_IO_H 1
+
 /* Define to 1 if you have the <termios.h> header file. */
 #cmakedefine HAVE_TERMIOS_H 1
 

src/connector.c

@@ -27,7 +27,7 @@
 #define CHUNKSIZE 4096
 
 #ifdef _WIN32
-# if _MSC_VER >= 1400
+# ifdef HAVE_IO_H
 #  include <io.h>
 #  undef open
 #  define open _open
@@ -37,7 +37,7 @@
 #  define read _read
 #  undef unlink
 #  define unlink _unlink
-# endif /* _MSC_VER */
+# endif /* HAVE_IO_H */
 #endif
 
 struct ssh_connector_struct {

src/misc.c

@@ -59,9 +59,9 @@
 #include <shlobj.h>
 #include <direct.h>
 
-#if _MSC_VER >= 1400
-# include <io.h>
-#endif /* _MSC_VER */
+#ifdef HAVE_IO_H
+#include <io.h>
+#endif /* HAVE_IO_H */
 
 #endif /* _WIN32 */
 

src/pki.c

@@ -41,7 +41,7 @@
 #include <sys/types.h>
 
 #ifdef _WIN32
-# if _MSC_VER >= 1400
+# ifdef HAVE_IO_H
 #  include <io.h>
 #  undef open
 #  define open _open
@@ -51,7 +51,7 @@
 #  define read _read
 #  undef unlink
 #  define unlink _unlink
-# endif /* _MSC_VER */
+# endif /* HAVE_IO_H */
 #endif
 
 #include "libssh/libssh.h"