RTS tidyup sweep, first phase

The first phase of this tidyup is focussed on the header files, and in
particular making sure we are exposinng publicly exactly what we need
to, and no more.

 - Rts.h now includes everything that the RTS exposes publicly,
   rather than a random subset of it.

 - Most of the public header files have moved into subdirectories, and
   many of them have been renamed.  But clients should not need to
   include any of the other headers directly, just #include the main
   public headers: Rts.h, HsFFI.h, RtsAPI.h.

 - All the headers needed for via-C compilation have moved into the
   stg subdirectory, which is self-contained.  Most of the headers for
   the rest of the RTS APIs have moved into the rts subdirectory.

 - I left MachDeps.h where it is, because it is so widely used in
   Haskell code.
 
 - I left a deprecated stub for RtsFlags.h in place.  The flag
   structures are now exposed by Rts.h.

 - Various internal APIs are no longer exposed by public header files.

 - Various bits of dead code and declarations have been removed

 - More gcc warnings are turned on, and the RTS code is more
   warning-clean.

 - More source files #include "PosixSource.h", and hence only use
   standard POSIX (1003.1c-1995) interfaces.

There is a lot more tidying up still to do, this is just the first
pass.  I also intend to standardise the names for external RTS APIs
(e.g use the rts_ prefix consistently), and declare the internal APIs
as hidden for shared libraries.

1 files changed, 3 insertions, 2 deletions

diff --git a/rts/PosixSource.h b/rts/PosixSource.h
index a938f9bc0f..cd1aeea34c 100644
--- a/rts/PosixSource.h
+++ b/rts/PosixSource.h
@@ -11,8 +11,9 @@
 
 #define _POSIX_SOURCE   1
 #define _POSIX_C_SOURCE 199506L
-#define _ISOC9X_SOURCE
+#define _XOPEN_SOURCE   500
+#define _ISOC99_SOURCE
 
-/* Let's be ISO C9X too... */
+/* Let's be ISO C99 too... */
 
 #endif /* POSIXSOURCE_H */