From f3ea2d159107055864962f94d1fcbbadec8e82b3 Mon Sep 17 00:00:00 2001
From: Kazuki Yamaguchi <k@rhe.jp>
Date: Fri, 14 Apr 2017 10:41:46 +0900
Subject: configure.in: assume limits.h is always available

It's a mandatory header in C89.
---
 configure.in        |  1 -
 include/ruby/ruby.h | 19 +------------------
 include/ruby/st.h   |  8 +-------
 vsnprintf.c         | 13 +------------
 win32/Makefile.sub  |  1 -
 5 files changed, 3 insertions(+), 39 deletions(-)

diff --git a/configure.in b/configure.in
index b5fed4c612..9c6d5c17fb 100644
--- a/configure.in
+++ b/configure.in
@@ -1389,7 +1389,6 @@ AC_CHECK_HEADERS(fcntl.h)
 AC_CHECK_HEADERS(ieeefp.h)
 AC_CHECK_HEADERS(intrinsics.h)
 AC_CHECK_HEADERS(langinfo.h)
-AC_CHECK_HEADERS(limits.h)
 AC_CHECK_HEADERS(locale.h)
 AC_CHECK_HEADERS(malloc.h)
 AC_CHECK_HEADERS(malloc/malloc.h)
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 099bbd31d3..58ec783c2e 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -179,24 +179,7 @@ typedef char ruby_check_sizeof_voidp[SIZEOF_VOIDP == sizeof(void*) ? 1 : -1];
 #define PRIxSIZE PRI_SIZE_PREFIX"x"
 #define PRIXSIZE PRI_SIZE_PREFIX"X"
 
-#ifdef __STDC__
-# include <limits.h>
-#else
-# ifndef LONG_MAX
-#  ifdef HAVE_LIMITS_H
-#   include <limits.h>
-#  else
-    /* assuming 32bit(2's complement) long */
-#   define LONG_MAX 2147483647
-#  endif
-# endif
-# ifndef LONG_MIN
-#  define LONG_MIN (-LONG_MAX-1)
-# endif
-# ifndef CHAR_BIT
-#  define CHAR_BIT 8
-# endif
-#endif
+#include <limits.h>
 
 #ifdef HAVE_LONG_LONG
 # ifndef LLONG_MAX
diff --git a/include/ruby/st.h b/include/ruby/st.h
index 47e14a3e2c..dd693a67b3 100644
--- a/include/ruby/st.h
+++ b/include/ruby/st.h
@@ -27,13 +27,7 @@ typedef unsigned LONG_LONG st_data_t;
 #endif
 #define ST_DATA_T_DEFINED
 
-#ifndef CHAR_BIT
-# ifdef HAVE_LIMITS_H
-#  include <limits.h>
-# else
-#  define CHAR_BIT 8
-# endif
-#endif
+#include <limits.h>
 #ifndef _
 # define _(args) args
 #endif
diff --git a/vsnprintf.c b/vsnprintf.c
index 78d09c3729..070119f49f 100644
--- a/vsnprintf.c
+++ b/vsnprintf.c
@@ -74,18 +74,7 @@
 #define	_BSD_VA_LIST_ va_list
 #endif
 
-#ifdef __STDC__
-# include <limits.h>
-#else
-# ifndef LONG_MAX
-#  ifdef HAVE_LIMITS_H
-#   include <limits.h>
-#  else
-    /* assuming 32bit(2's complement) long */
-#   define LONG_MAX 2147483647
-#  endif
-# endif
-#endif
+#include <limits.h>
 
 #if defined(__hpux) && !defined(__GNUC__) && !defined(__STDC__)
 #define const
diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index 4adca6bcbc..147a6171a3 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -633,7 +633,6 @@ $(CONFIG_H): $(MKFILES) $(srcdir)/win32/Makefile.sub $(win_srcdir)/Makefile.sub
 !endif
 #define RUBY_EXTERN extern __declspec(dllimport)
 #define HAVE_DECL_SYS_NERR 1
-#define HAVE_LIMITS_H 1
 #define HAVE_FCNTL_H 1
 #define HAVE_SYS_UTIME_H 1
 #define HAVE_TIME_H 1
-- 
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