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# $NetBSD: endian.mk,v 1.3 2004/02/06 19:04:25 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 - | ${EGREP} "^(1234|4321)" \
`; \
case `${ECHO} $${byte_order}` in \
1234) ${ECHO} little ;; \
4321) ${ECHO} big ;; \
*) ${ECHO} unknown ;; \
esac
MAKEFLAGS+= MACHINE_ENDIAN=${MACHINE_ENDIAN}
.endif
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