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, 32 insertions, 18 deletions

diff --git a/random.c b/random.c
index d763a214cd..29ac388311 100644
--- a/random.c
+++ b/random.c
@@ -9,41 +9,59 @@
 
 **********************************************************************/
 
-#include "internal.h"
+#include "ruby/config.h"
 
+#include <errno.h>
 #include <limits.h>
+#include <math.h>
+#include <time.h>
+
 #ifdef HAVE_UNISTD_H
-#include <unistd.h>
+# include <unistd.h>
 #endif
-#include <time.h>
+
 #include <sys/types.h>
 #include <sys/stat.h>
+
 #ifdef HAVE_FCNTL_H
-#include <fcntl.h>
+# include <fcntl.h>
 #endif
-#include <math.h>
-#include <errno.h>
+
 #if defined(HAVE_SYS_TIME_H)
-#include <sys/time.h>
+# include <sys/time.h>
 #endif
 
 #ifdef HAVE_SYSCALL_H
-#include <syscall.h>
+# include <syscall.h>
 #elif defined HAVE_SYS_SYSCALL_H
-#include <sys/syscall.h>
+# include <sys/syscall.h>
 #endif
 
 #ifdef _WIN32
-#include <windows.h>
-#include <wincrypt.h>
+# include <winsock2.h>
+# include <windows.h>
+# include <wincrypt.h>
 #endif
-#include "ruby_atomic.h"
 
 #ifdef __OpenBSD__
 /* to define OpenBSD for version check */
-#include <sys/param.h>
+# include <sys/param.h>
+#endif
+
+#if defined HAVE_GETRANDOM
+# include <sys/random.h>
+#elif defined __linux__ && defined __NR_getrandom
+# include <linux/random.h>
 #endif
 
+#include "internal.h"
+#include "internal/compilers.h"
+#include "internal/error.h"
+#include "internal/numeric.h"
+#include "internal/random.h"
+#include "internal/sanitizers.h"
+#include "ruby_atomic.h"
+
 typedef int int_must_be_32bit_at_least[sizeof(int) * CHAR_BIT < 32 ? -1 : 1];
 
 #include "missing/mt19937.c"
@@ -320,11 +338,7 @@ fill_random_bytes_urandom(void *seed, size_t size)
 # define fill_random_bytes_urandom(seed, size) -1
 #endif
 
-#if defined HAVE_GETRANDOM
-# include <sys/random.h>
-#elif defined __linux__ && defined __NR_getrandom
-# include <linux/random.h>
-
+#if ! defined HAVE_GETRANDOM && defined __linux__ && defined __NR_getrandom
 # ifndef GRND_NONBLOCK
 #   define GRND_NONBLOCK 0x0001	/* not defined in musl libc */
 # endif