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, 19 insertions, 11 deletions

diff --git a/time.c b/time.c
index d71d43e058..0f7b35f824 100644
--- a/time.c
+++ b/time.c
@@ -11,29 +11,37 @@
 
 #define _DEFAULT_SOURCE
 #define _BSD_SOURCE
-#include "ruby/encoding.h"
-#include "internal.h"
-#include <sys/types.h>
-#include <time.h>
+#include "ruby/config.h"
+
 #include <errno.h>
+#include <float.h>
+#include <math.h>
+#include <time.h>
+#include <sys/types.h>
 
 #ifdef HAVE_UNISTD_H
-#include <unistd.h>
+# include <unistd.h>
 #endif
 
-#include <float.h>
-#include <math.h>
-
 #ifdef HAVE_STRINGS_H
-#include <strings.h>
+# include <strings.h>
 #endif
 
 #if defined(HAVE_SYS_TIME_H)
-#include <sys/time.h>
+# include <sys/time.h>
 #endif
 
-#include "timev.h"
 #include "id.h"
+#include "internal.h"
+#include "internal/array.h"
+#include "internal/compar.h"
+#include "internal/numeric.h"
+#include "internal/rational.h"
+#include "internal/string.h"
+#include "internal/time.h"
+#include "internal/variable.h"
+#include "ruby/encoding.h"
+#include "timev.h"
 
 static ID id_submicro, id_nano_num, id_nano_den, id_offset, id_zone;
 static ID id_nanosecond, id_microsecond, id_millisecond, id_nsec, id_usec;