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Description: pkgsrc repository for Joyent.com accelerators
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pkgsrc / mk / endian.mk
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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