From 1306754b7af7f1bd095a9f866e980e6ad049d158 Mon Sep 17 00:00:00 2001
From: jlam <jlam>
Date: Mon, 22 Apr 2002 02:30:51 +0000
Subject: Makefile fragment to determine the endianness of the platform by
 checking header files.  It defines MACHINE_ENDIAN which is one of three
 values: little, big, or unknown.

This file is used in package Makefiles as follows:

.include "../../mk/endian.mk"

.if ${MACHINE_ENDIAN} == "big"
# ...big endian stuff...
.elif ${MACHINE_ENDIAN} == "little"
# ...little endian stuff...
.else
BROKEN=       "Unknown endianness"
.endif
---
 mk/endian.mk | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 mk/endian.mk

(limited to 'mk/endian.mk')

diff --git a/mk/endian.mk b/mk/endian.mk
new file mode 100644
index 00000000000..61113dee7d5
--- /dev/null
+++ b/mk/endian.mk
@@ -0,0 +1,51 @@
+# $NetBSD: endian.mk,v 1.1 2002/04/22 02:30:51 jlam Exp $
+#
+# Determine the endianness of the platform by checking header files.
+#
+# This file is used as follows:
+#
+# .include "../../mk/endian.mk"
+#
+# .if ${MACHINE_ENDIAN} == "big"
+# # ...big endian stuff...
+# .elif ${MACHINE_ENDIAN} == "little"
+# # ...little endian stuff...
+# .else
+# BROKEN=	"Unknown endianness"
+# .endif
+
+.include "../../mk/bsd.prefs.mk"
+.if !defined(MACHINE_ENDIAN)
+_ENDIAN_H_FILES=	/usr/include/endian.h		# Linux
+_ENDIAN_H_FILES+=	/usr/include/sys/endian.h	# NetBSD=>1.5
+_ENDIAN_H_FILES+=	/usr/include/machine/endian.h	# NetBSD<1.5
+_ENDIAN_H_FILES+=	/usr/include/sys/byteorder.h	# Solaris
+_ENDIAN_H_FILES+=	/dev/null
+.  for FILE in ${_ENDIAN_H_FILES}
+.    if !defined(_ENDIAN_H)
+.      if exists(${FILE})
+_ENDIAN_H?=		${FILE:S/\/usr\/include\///}
+.      endif
+.    endif
+.  endfor
+MACHINE_ENDIAN!=							\
+	byte_order=`							\
+		(							\
+			${ECHO} "\#include <${_ENDIAN_H}>";		\
+			${ECHO} "\#ifndef BYTE_ORDER";			\
+			${ECHO} "\#ifdef _BIG_ENDIAN";			\
+			${ECHO} "\#define BYTE_ORDER 4321";		\
+			${ECHO} "\#else";				\
+			${ECHO} "\#define BYTE_ORDER 1234";		\
+			${ECHO} "\#endif";				\
+			${ECHO} "\#endif";				\
+			${ECHO} "BYTE_ORDER";				\
+		) | ${CC} -E - | ${GREP} "^\\(1234\\|4321\\)"		\
+	`;								\
+	case `${ECHO} $${byte_order}` in				\
+	1234)	${ECHO} little ;;					\
+	4321)	${ECHO} big ;;						\
+	*)	${ECHO} unknown ;;					\
+	esac
+MAKEFLAGS+=	MACHINE_ENDIAN="${MACHINE_ENDIAN}"
+.endif
-- 
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