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# $NetBSD: endian.mk,v 1.9 2013/11/26 07:25:53 obache 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"
.include "../../mk/compiler.mk"
.if !defined(MACHINE_ENDIAN)
BUILTIN_FIND_HEADERS_VAR:= _ENDIAN_H
BUILTIN_FIND_HEADERS.ENDIAN_H= endian.h sys/endian.h machine/endian.h \
sys/byteorder.h
.include "../../mk/buildlink3/find-headers.mk"
. if !empty(_ENDIAN_H:M__nonexistent__)
_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"; } | ${CCPATH:U${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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