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, 23 insertions, 10 deletions

diff --git a/hash.c b/hash.c
index 44352c96f1..606d5d3930 100644
--- a/hash.c
+++ b/hash.c
@@ -11,17 +11,10 @@
 
 **********************************************************************/
 
-#include "ruby/encoding.h"
-#include "ruby/st.h"
-#include "ruby/util.h"
-#include "internal.h"
+#include "ruby/config.h"
+
 #include <errno.h>
-#include "probes.h"
-#include "id.h"
-#include "symbol.h"
-#include "debug_counter.h"
-#include "transient_heap.h"
-#include "ruby_assert.h"
+
 #ifdef __APPLE__
 # ifdef HAVE_CRT_EXTERNS_H
 #  include <crt_externs.h>
@@ -30,6 +23,26 @@
 # endif
 #endif
 
+#include "debug_counter.h"
+#include "id.h"
+#include "internal.h"
+#include "internal/array.h"
+#include "internal/bignum.h"
+#include "internal/class.h"
+#include "internal/cont.h"
+#include "internal/error.h"
+#include "internal/hash.h"
+#include "internal/object.h"
+#include "internal/proc.h"
+#include "internal/symbol.h"
+#include "internal/vm.h"
+#include "probes.h"
+#include "ruby/st.h"
+#include "ruby/util.h"
+#include "ruby_assert.h"
+#include "symbol.h"
+#include "transient_heap.h"
+
 #ifndef HASH_DEBUG
 #define HASH_DEBUG 0
 #endif