external/bsd/elftoolchain/dist/common/native-elf-format

   1 #!/bin/sh
   2 #
   3 # Id: native-elf-format 2064 2011-10-26 15:12:32Z jkoshy
   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
  11 program=`basename $0`
  12 tmp_c=`mktemp -u nefXXXXXX`.c
  13 tmp_o=`echo ${tmp_c} | sed -e 's/.c$/.o/'`
  14
  15 trap "rm -f ${tmp_c} ${tmp_o}"  0 1 2 3 15
  16
  17 touch ${tmp_c}
  18
  19 echo "/* Generated by ${program} on `date` */"
  20
  21 cc -c ${tmp_c} -o ${tmp_o}
  22 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, ".*X86-64")) {
  37             elfarch = "EM_X86_64";
  38         } else {
  39             elfarch = "unknown";
  40         }
  41     }
  42 END {
  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