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, 27 insertions, 11 deletions

diff --git a/parse.y b/parse.y
index 1281eb6258..5f7884b5ae 100644
--- a/parse.y
+++ b/parse.y
@@ -20,18 +20,37 @@
 #define YYLTYPE rb_code_location_t
 #define YYLTYPE_IS_DECLARED 1
 
-#include "ruby/ruby.h"
-#include "ruby/st.h"
-#include "ruby/encoding.h"
+#include "ruby/config.h"
+
+#include <ctype.h>
+#include <errno.h>
+#include <stdio.h>
+
 #include "internal.h"
+#include "internal/compile.h"
+#include "internal/complex.h"
+#include "internal/error.h"
+#include "internal/hash.h"
+#include "internal/imemo.h"
+#include "internal/io.h"
+#include "internal/numeric.h"
+#include "internal/parse.h"
+#include "internal/rational.h"
+#include "internal/re.h"
+#include "internal/symbol.h"
+#include "internal/thread.h"
+#include "internal/util.h"
+#include "internal/variable.h"
 #include "node.h"
 #include "parse.h"
-#include "symbol.h"
-#include "regenc.h"
-#include <stdio.h>
-#include <errno.h>
-#include <ctype.h>
 #include "probes.h"
+#include "regenc.h"
+#include "ruby/encoding.h"
+#include "ruby/regex.h"
+#include "ruby/ruby.h"
+#include "ruby/st.h"
+#include "ruby/util.h"
+#include "symbol.h"
 
 #ifndef WARN_PAST_SCOPE
 # define WARN_PAST_SCOPE 0
@@ -5531,9 +5550,6 @@ ripper_dispatch_delayed_token(struct parser_params *p, enum yytokentype t)
 #define has_delayed_token(p) (!NIL_P(p->delayed.token))
 #endif /* RIPPER */
 
-#include "ruby/regex.h"
-#include "ruby/util.h"
-
 static inline int
 is_identchar(const char *ptr, const char *MAYBE_UNUSED(ptr_end), rb_encoding *enc)
 {