diff system/System.h @ 1038:cc27f35aa75c cxx11

Introducing the signed 64-bit frame index type, and fixing build failures from inclusion of -Wconversion with -Werror. Not finished yet.

--- a/system/System.h	Tue Mar 03 09:33:59 2015 +0000
+++ b/system/System.h	Tue Mar 03 15:18:24 2015 +0000
@@ -143,12 +143,13 @@
 extern ProcessStatus GetProcessStatus(int pid);
 
 // Return a vague approximation to the number of free megabytes of real memory.
-// Return -1 if unknown.
-extern void GetRealMemoryMBAvailable(int &available, int &total);
+// Return -1 if unknown. (Hence signed args)
+extern void GetRealMemoryMBAvailable(ssize_t &available, ssize_t &total);
 
-// Return a vague approximation to the number of free megabytes of disc space
-// on the partition containing the given path.  Return -1 if unknown.
-extern int GetDiscSpaceMBAvailable(const char *path);
+// Return a vague approximation to the number of free megabytes of
+// disc space on the partition containing the given path.  Return -1
+// if unknown. (Hence signed return type)
+extern ssize_t GetDiscSpaceMBAvailable(const char *path);
 
 extern void StoreStartupLocale();
 extern void RestoreStartupLocale();