decouple internal.h headers

Saves comitters' daily life by avoid #include-ing everything from
internal.h to make each file do so instead.  This would significantly
speed up incremental builds.

We take the following inclusion order in this changeset:

1.  "ruby/config.h", where _GNU_SOURCE is defined (must be the very
    first thing among everything).
2.  RUBY_EXTCONF_H if any.
3.  Standard C headers, sorted alphabetically.
4.  Other system headers, maybe guarded by #ifdef
5.  Everything else, sorted alphabetically.

Exceptions are those win32-related headers, which tend not be self-
containing (headers have inclusion order dependencies).

1 files changed, 15 insertions, 5 deletions

diff --git a/sprintf.c b/sprintf.c
index 23eb39a73b..64cfdee1a1 100644
--- a/sprintf.c
+++ b/sprintf.c
@@ -11,17 +11,27 @@
 
 **********************************************************************/
 
-#include "ruby/encoding.h"
-#include "ruby/re.h"
-#include "internal.h"
-#include "id.h"
+#include "ruby/config.h"
+
 #include <math.h>
 #include <stdarg.h>
 
 #ifdef HAVE_IEEEFP_H
-#include <ieeefp.h>
+# include <ieeefp.h>
 #endif
 
+#include "id.h"
+#include "internal.h"
+#include "internal/error.h"
+#include "internal/hash.h"
+#include "internal/numeric.h"
+#include "internal/object.h"
+#include "internal/sanitizers.h"
+#include "internal/symbol.h"
+#include "internal/util.h"
+#include "ruby/encoding.h"
+#include "ruby/re.h"
+
 #define BIT_DIGITS(N)   (((N)*146)/485 + 1)  /* log2(10) =~ 146/485 */
 
 static char *fmt_setup(char*,size_t,int,int,int,int);