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# $NetBSD: endian.mk,v 1.5 2007/03/08 23:11:20 rillig 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)
. if exists(/usr/include/endian.h)
_ENDIAN_H= /usr/include/endian.h # Linux
. elif exists(/usr/include/sys/endian.h)
_ENDIAN_H= /usr/include/sys/endian.h # NetBSD>=1.5
. elif exists(/usr/include/machine/endian.h)
_ENDIAN_H= /usr/include/machine/endian.h # NetBSD<1.5
. elif exists(/usr/include/sys/byteorder.h)
_ENDIAN_H= /usr/include/sys/byteorder.h # Solaris
. else
_ENDIAN_H= /dev/null
. endif
MACHINE_ENDIAN!= \
{ ${ECHO} "\#if defined(__sgi)"; \
${ECHO} "\# include <standards.h>"; \
${ECHO} "\#endif"; \
${ECHO} "\#include <${_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 - | \
{ while read line; do \
case $$line in \
1234) ${ECHO} "little"; exit 0 ;; \
4321) ${ECHO} "big"; exit 0 ;; \
esac; \
done; \
${ECHO} "unknown"; }
MAKEFLAGS+= MACHINE_ENDIAN=${MACHINE_ENDIAN:Q}
.endif
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