ceph/src/spdk/dpdk/buildtools/auto-config-h.sh

   1 #!/bin/sh
   2 # SPDX-License-Identifier: BSD-3-Clause
   3 # Copyright 2014-2015 6WIND S.A.
   4 #
   5 # Crude script to detect whether particular types, macros and functions are
   6 # defined by trying to compile a file with a given header. Can be used to
   7 # perform cross-platform checks since the resulting object file is not
   8 # executed.
   9 #
  10 # Set VERBOSE=1 in the environment to display compiler output and errors.
  11 #
  12 # CC, CPPFLAGS, CFLAGS, EXTRA_CPPFLAGS and EXTRA_CFLAGS are taken from the
  13 # environment.
  14 #
  15 # AUTO_CONFIG_CFLAGS may append additional CFLAGS without modifying the
  16 # above variables.
  17
  18 file=${1:?output file name required (config.h)}
  19 macro=${2:?output macro name required (HAVE_*)}
  20 include=${3:?include name required (foo.h)}
  21 type=${4:?object type required (define, enum, type, field, func)}
  22 name=${5:?define/type/function name required}
  23
  24 : ${CC:=cc}
  25
  26 temp=/tmp/${0##*/}.$$.c
  27
  28 case $type in
  29 define)
  30         code="\
  31 #ifndef $name
  32 #error $name not defined
  33 #endif
  34 "
  35         ;;
  36 enum)
  37         code="\
  38 long test____ = $name;
  39 "
  40         ;;
  41 type)
  42         code="\
  43 $name test____;
  44 "
  45         ;;
  46 field)
  47         code="\
  48 void test____(void)
  49 {
  50         ${name%%.*} test_____;
  51
  52         (void)test_____.${name#*.};
  53 }
  54 "
  55         ;;
  56 func)
  57         code="\
  58 void (*test____)() = (void (*)())$name;
  59 "
  60         ;;
  61 *)
  62         unset error
  63         : ${error:?unknown object type \"$type\"}
  64         exit
  65 esac
  66
  67 if [ "${VERBOSE}" = 1 ]
  68 then
  69         err=2
  70         out=1
  71         eol='
  72 '
  73 else
  74         exec 3> /dev/null ||
  75         exit
  76         err=3
  77         out=3
  78         eol=' '
  79 fi &&
  80 printf 'Looking for %s %s in %s.%s' \
  81         "${name}" "${type}" "${include}" "${eol}" &&
  82 printf "\
  83 #include <%s>
  84
  85 %s
  86 " "$include" "$code" > "${temp}" &&
  87 if ${CC} ${CPPFLAGS} ${EXTRA_CPPFLAGS} ${CFLAGS} ${EXTRA_CFLAGS} \
  88         ${AUTO_CONFIG_CFLAGS} \
  89         -c -o ${temp}.o "${temp}" 1>&${out} 2>&${err}
  90 then
  91         rm -f "${temp}" "${temp}.o"
  92         printf "\
  93 #ifndef %s
  94 #define %s 1
  95 #endif /* %s */
  96
  97 " "${macro}" "${macro}" "${macro}" >> "${file}" &&
  98         printf 'Defining %s.\n' "${macro}"
  99 else
 100         rm -f "${temp}" "${temp}.o"
 101         printf "\
 102 /* %s is not defined. */
 103
 104 " "${macro}" >> "${file}" &&
 105         printf 'Not defining %s.\n' "${macro}"
 106 fi
 107
 108 exit