58 lines
1.6 KiB
Makefile
58 lines
1.6 KiB
Makefile
# $NetBSD: endian.mk,v 1.11 2024/01/26 03:16:58 riastradh 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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.include "../../mk/compiler.mk"
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.if !defined(MACHINE_ENDIAN)
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BUILTIN_FIND_HEADERS_VAR:= _ENDIAN_H
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BUILTIN_FIND_HEADERS._ENDIAN_H= endian.h sys/endian.h machine/endian.h \
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sys/byteorder.h
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.include "../../mk/buildlink3/find-headers.mk"
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. if !empty(_ENDIAN_H:M__nonexistent__)
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_ENDIAN_H= /dev/null
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. endif
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_MACHINE_ENDIAN_CPP= ${CCPATH:U${CC}} -E -
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.if ${TOOLS_USE_CROSS_COMPILE:tl} == "yes"
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_MACHINE_ENDIAN_CPP+= --sysroot=${TOOLS_CROSS_DESTDIR:Q}
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.endif
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MACHINE_ENDIAN!= \
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{ ${ECHO} "\#if defined(__sgi)"; \
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${ECHO} "\# include <standards.h>"; \
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${ECHO} "\#endif"; \
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${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"; } | ${_MACHINE_ENDIAN_CPP} | \
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{ while read line; do \
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case $$line in \
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1234) ${ECHO} "little"; exit 0 ;; \
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4321) ${ECHO} "big"; exit 0 ;; \
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esac; \
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done; \
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${ECHO} "unknown"; }
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MAKEFLAGS+= MACHINE_ENDIAN=${MACHINE_ENDIAN:Q}
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.endif
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