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#!/bin/sh
#
# $Id: native-elf-format 3293 2016-01-07 19:26:27Z emaste $
#
# Find the native ELF format for a host platform by compiling a
# test object and examining the resulting object.
#
# This script is used if there is no easy way to determine this
# information statically at compile time.
program=`basename $0`
tmp_c=`mktemp -u nefXXXXXX`.c
tmp_o=`echo ${tmp_c} | sed -e 's/.c$/.o/'`
trap "rm -f ${tmp_c} ${tmp_o}" 0 1 2 3 15
touch ${tmp_c}
echo "/* Generated by ${program} on `date` */"
cc -c ${tmp_c} -o ${tmp_o}
LC_ALL=C readelf -h ${tmp_o} | awk '
$1 ~ "Class:" {
sub("ELF","",$2); elfclass = $2;
}
$1 ~ "Data:" {
if (match($0, "little")) {
elfdata = "LSB";
} else {
elfdata = "MSB";
}
}
$1 ~ "Machine:" {
if (match($0, "ARM")) {
elfarch = "EM_ARM";
} else if (match($0, "AArch64")) {
elfarch = "EM_AARCH64";
} else if (match($0, "Intel.*386")) {
elfarch = "EM_386";
} else if (match($0, "MIPS")) {
elfarch = "EM_MIPS";
} else if (match($0, ".*[xX]86[-_]64")) {
elfarch = "EM_X86_64";
} else {
elfarch = "unknown";
}
}
END {
printf("#define ELFTC_CLASS ELFCLASS%s\n", elfclass);
printf("#define ELFTC_ARCH %s\n", elfarch);
printf("#define ELFTC_BYTEORDER ELFDATA2%s\n", elfdata);
}'
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