ff13344585
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
51 lines
1.4 KiB
Makefile
51 lines
1.4 KiB
Makefile
# $NetBSD: endian.mk,v 1.1 2002/04/22 02:30:51 jlam Exp $
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#
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# Determine the endianness of the platform by checking header files.
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#
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# This file is used as follows:
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#
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# .include "../../mk/endian.mk"
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#
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# .if ${MACHINE_ENDIAN} == "big"
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# # ...big endian stuff...
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# .elif ${MACHINE_ENDIAN} == "little"
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# # ...little endian stuff...
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# .else
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# BROKEN= "Unknown endianness"
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# .endif
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.include "../../mk/bsd.prefs.mk"
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.if !defined(MACHINE_ENDIAN)
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_ENDIAN_H_FILES= /usr/include/endian.h # Linux
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_ENDIAN_H_FILES+= /usr/include/sys/endian.h # NetBSD=>1.5
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_ENDIAN_H_FILES+= /usr/include/machine/endian.h # NetBSD<1.5
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_ENDIAN_H_FILES+= /usr/include/sys/byteorder.h # Solaris
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_ENDIAN_H_FILES+= /dev/null
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. for FILE in ${_ENDIAN_H_FILES}
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. if !defined(_ENDIAN_H)
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. if exists(${FILE})
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_ENDIAN_H?= ${FILE:S/\/usr\/include\///}
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. endif
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. endif
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. endfor
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MACHINE_ENDIAN!= \
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byte_order=` \
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( \
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${ECHO} "\#include <${_ENDIAN_H}>"; \
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${ECHO} "\#ifndef BYTE_ORDER"; \
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${ECHO} "\#ifdef _BIG_ENDIAN"; \
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${ECHO} "\#define BYTE_ORDER 4321"; \
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${ECHO} "\#else"; \
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${ECHO} "\#define BYTE_ORDER 1234"; \
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${ECHO} "\#endif"; \
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${ECHO} "\#endif"; \
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${ECHO} "BYTE_ORDER"; \
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) | ${CC} -E - | ${GREP} "^\\(1234\\|4321\\)" \
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`; \
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case `${ECHO} $${byte_order}` in \
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1234) ${ECHO} little ;; \
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4321) ${ECHO} big ;; \
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*) ${ECHO} unknown ;; \
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esac
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MAKEFLAGS+= MACHINE_ENDIAN="${MACHINE_ENDIAN}"
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.endif
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