1#!/bin/sh
2#
3# $Id: native-elf-format 3186 2015-04-16 22:16:40Z emaste $
4#
5# Find the native ELF format for a host platform by compiling a
6# test object and examining the resulting object.
7#
8# This script is used if there is no easy way to determine this
9# information statically at compile time.
10
11program=`basename $0`
12tmp_c=`mktemp -u nefXXXXXX`.c
13tmp_o=`echo ${tmp_c} | sed -e 's/.c$/.o/'`
14
15trap "rm -f ${tmp_c} ${tmp_o}"	0 1 2 3 15
16
17touch ${tmp_c}
18
19echo "/* Generated by ${program} on `date` */"
20
21cc -c ${tmp_c} -o ${tmp_o}
22LC_ALL=C readelf -h ${tmp_o} | awk '
23$1 ~ "Class:" {
24        sub("ELF","",$2); elfclass = $2;
25    }
26$1 ~ "Data:"  {
27        if (match($0, "little")) {
28            elfdata = "LSB";
29 	} else {
30            elfdata = "MSB";
31	}
32    }
33$1 ~ "Machine:" {
34        if (match($0, "Intel.*386")) {
35            elfarch = "EM_386";
36        } else if (match($0, ".*[xX]86-64")) {
37            elfarch = "EM_X86_64";
38        } else {
39            elfarch = "unknown";
40        }
41    }
42END {
43    printf("#define	ELFTC_CLASS	ELFCLASS%s\n", elfclass);
44    printf("#define	ELFTC_ARCH	%s\n", elfarch);
45    printf("#define	ELFTC_BYTEORDER	ELFDATA2%s\n", elfdata);
46}'
47
48