Reduce compiler.h to almost nothing (but it's worth keeping around I think, for

the MSVC and MipsPro warning stuff).

As a result of this patch, simgear/sg_traits.h can be deleted. So can SGCMath.h,
but I'll do that separately.

There is one more 'mechanical' change to come - getting rid of SG_USING_STD(X),
but I want to keep that separate from everything else. (There's another mechnica
l change, replacing <math.h> with <cmath> and so on *everywhere*, but one step a
t a time)

simgear/misc/sg_path.hxx

@@ -31,7 +31,7 @@
 #include <sys/types.h>
 
 #include <simgear/compiler.h>
-#include STL_STRING
+#include <string>
 
 #include <simgear/math/sg_types.hxx>
 

simgear/misc/sgstream.cxx

@@ -21,15 +21,9 @@
 // $Id$
 
 #include <simgear/compiler.h>
-#include STL_STRING 
-
+#include <string>
 #include <ctype.h> // isspace()
-
-#ifdef SG_HAVE_STD_INCLUDES
-# include <cerrno>
-#else
-# include <errno.h>
-#endif
+#include <cerrno>
 
 #include "sgstream.hxx"
 

simgear/misc/sgstream.hxx

@@ -35,7 +35,7 @@
 
 #  include <istream>
 
-#include STL_STRING
+#include <string>
 
 #include <simgear/misc/zfstream.hxx>
 

simgear/misc/strutils.hxx

@@ -29,16 +29,12 @@
 
 #include <simgear/compiler.h>
 
-#include STL_STRING
+#include <string>
 
 #include <vector>
 SG_USING_STD(vector);
 
-#ifdef SG_HAVE_STD_INCLUDES
-#  include <cstdlib>
-#else
-#  include <stdlib.h>
-#endif
+#include <cstdlib>
 
 SG_USING_STD(string);
 

simgear/misc/tabbed_values.hxx

@@ -26,7 +26,7 @@
 #include <simgear/compiler.h>
 
 #include <vector>
-#include STL_STRING
+#include <string>
 
 SG_USING_STD(vector);
 SG_USING_STD(string);

simgear/misc/tabbed_values_test.cxx

@@ -4,7 +4,7 @@
 
 #include <simgear/compiler.h>
 
-#include STL_IOSTREAM
+#include <iostream>
 #include "tabbed_values.hxx"
 
 SG_USING_STD(cout);

simgear/misc/texcoord.cxx

@@ -145,7 +145,7 @@ enter this in the official comments in case I forget again. :-)
 
 #include <simgear/compiler.h>
 
-// #include STL_IOSTREAM
+// #include <iostream>
 
 #include "texcoord.hxx"
 

simgear/misc/zfstream.cxx

@@ -23,11 +23,7 @@
 
 #include <simgear/compiler.h>
 
-#ifdef SG_HAVE_STD_INCLUDES
-# include <cerrno>
-#else
-# include <errno.h>
-#endif
+#include <cerrno>
 #include <memory.h>
 #include <stdio.h>
 

simgear/misc/zfstream.hxx

@@ -31,51 +31,20 @@
 
 #include <zlib.h>
 
-#ifdef SG_HAVE_STD_INCLUDES
 
-#  include <streambuf>
-#  include <istream>
+#include <streambuf>
+#include <istream>
 
-#  define ios_openmode std::ios_base::openmode
-#  define ios_in       std::ios_base::in
-#  define ios_out      std::ios_base::out
-#  define ios_app      std::ios_base::app
-#  define ios_binary   std::ios_base::binary
+#define ios_openmode std::ios_base::openmode
+#define ios_in       std::ios_base::in
+#define ios_out      std::ios_base::out
+#define ios_app      std::ios_base::app
+#define ios_binary   std::ios_base::binary
 
-#  define ios_seekdir  std::ios_base::seekdir
+#define ios_seekdir  std::ios_base::seekdir
 
-#  define ios_badbit   std::ios_base::badbit
-#  define ios_failbit  std::ios_base::failbit
-
-#else
-
-#  ifdef SG_HAVE_STREAMBUF
-#    include <streambuf.h>
-#    include <istream.h>
-#  else
-#    include <iostream.h>
-#  endif
-
-//#  define ios_openmode ios::open_mode
-#  define ios_openmode int
-#  define ios_in       ios::in
-#  define ios_out      ios::out
-#  define ios_app      ios::app
-
-#if defined(__GNUC__) && __GNUC_MINOR__ < 8
-#  define ios_binary   ios::bin
-#else
-#  define ios_binary   ios::binary
-#endif
-
-#  define ios_seekdir  ios::seek_dir
-
-#  define ios_badbit   ios::badbit
-#  define ios_failbit  ios::failbit
-
-#  include <simgear/sg_traits.hxx>
-
-#endif // SG_HAVE_STD_INCLUDES
+#define ios_badbit   std::ios_base::badbit
+#define ios_failbit  std::ios_base::failbit
 
 /**
  * A C++ I/O streams interface to the zlib gz* functions.
@@ -87,14 +56,6 @@ class gzfilebuf : public std::streambuf
 #endif
 {
 public:
-
-#ifndef SG_HAVE_STD_INCLUDES
-    typedef char_traits<char>           traits_type;
-    typedef char_traits<char>::int_type int_type;
-    // typedef char_traits<char>::pos_type pos_type;
-    // typedef char_traits<char>::off_type off_type;
-#endif
-
     /** Constructor */
     gzfilebuf();
 
@@ -135,12 +96,8 @@ public:
 protected:
 
     virtual int_type underflow();
-#ifndef SG_HAVE_STD_INCLUDES
-    virtual int_type overflow( int_type c = traits_type::eof() );
-#else
-    virtual int_type overflow( int_type c = std::streambuf::traits_type::eof() );
-#endif
 
+    virtual int_type overflow( int_type c = traits_type::eof() );
 private:
 
     int_type flushbuf();