m4/ensc_dietlibc.m4

   1 dnl $Id: ensc_dietlibc.m4 2453 2007-01-17 09:54:53Z dhozac $
   2
   3 dnl Copyright (C) 2002 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
   4 dnl
   5 dnl This program is free software; you can redistribute it and/or modify
   6 dnl it under the terms of the GNU General Public License as published by
   7 dnl the Free Software Foundation; version 2 of the License.
   8 dnl
   9 dnl This program is distributed in the hope that it will be useful,
  10 dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 dnl GNU General Public License for more details.
  13 dnl
  14 dnl You should have received a copy of the GNU General Public License
  15 dnl along with this program; if not, write to the Free Software
  16 dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17
  18 AC_DEFUN([_ENSC_DIETLIBC_C99],
  19 [
  20         AH_TEMPLATE([ENSC_DIETLIBC_C99], [Define to 1 if dietlibc supports C99])
  21
  22         AC_CACHE_CHECK([whether dietlibc supports C99], [ensc_cv_c_dietlibc_c99],
  23         [
  24                 _ensc_dietlibc_c99_old_CFLAGS=$CFLAGS
  25                 _ensc_dietlibc_c99_old_CC=$CC
  26
  27                 CFLAGS="-std=c99"
  28                 CC="${DIET:-diet} $CC"
  29
  30                 AC_LANG_PUSH(C)
  31                 AC_COMPILE_IFELSE([/* */],[
  32                         AC_COMPILE_IFELSE([
  33                                 #include <stdint.h>
  34                                 #include <sys/cdefs.h>
  35                                 #if defined(inline)
  36                                 #  error 'inline' badly defined
  37                                 #endif
  38                                 volatile uint64_t       a;
  39                         ],
  40                         [ensc_cv_c_dietlibc_c99=yes],
  41                         [ensc_cv_c_dietlibc_c99=no])],
  42                         [ensc_cv_c_dietlibc_c99='skipped (compiler does not support C99)'])
  43                 AC_LANG_POP
  44
  45                 CC=$_ensc_dietlibc_c99_old_CC
  46                 CFLAGS=$_ensc_dietlibc_c99_old_CFLAGS
  47         ])
  48
  49         if test x"$ensc_cv_c_dietlibc_c99" = xyes; then
  50                 AC_DEFINE(ENSC_DIETLIBC_C99,1)
  51         fi
  52 ])
  53
  54 AC_DEFUN([_ENSC_DIETLIBC_SYSCALL],
  55 [
  56         AH_TEMPLATE([ENSC_DIETLIBC_HAS_SYSCALL], [Define to 1 if dietlibc declares syscall])
  57
  58         AC_CACHE_CHECK([whether dietlibc declares syscall], [ensc_cv_c_dietlibc_syscall],
  59         [
  60                 _ensc_dietlibc_syscall_old_CC="$CC"
  61                 CC="${DIET:-diet} $CC"
  62
  63                 AC_LANG_PUSH(C)
  64                 AC_COMPILE_IFELSE([
  65                         #include <sys/syscall.h>
  66                         long int syscall(long int __sysno, ...);
  67                 ],
  68                 [ensc_cv_c_dietlibc_syscall=no],
  69                 [ensc_cv_c_dietlibc_syscall=yes])
  70                 AC_LANG_POP
  71
  72                 CC="$_ensc_dietlibc_syscall_old_CC"
  73         ])
  74
  75         if test x"$ensc_cv_c_dietlibc_syscall" = xyes; then
  76                 AC_DEFINE(ENSC_DIETLIBC_HAS_SYSCALL,1)
  77         fi
  78 ])
  79
  80 dnl Usage: ENSC_ENABLE_DIETLIBC(<conditional>[,<min-version>])
  81 dnl        <conditional> ... automake-conditional which will be set when
  82 dnl                          dietlibc shall be enabled
  83 dnl        provides:
  84 dnl        * $ENSC_VERSION_DIETLIBC_NUM and
  85 dnl        * $ENSC_VERSION_DIETLIBC
  86
  87 AC_DEFUN([ENSC_ENABLE_DIETLIBC],
  88 [
  89         AC_MSG_CHECKING([whether to enable dietlibc])
  90
  91         AC_ARG_VAR(DIET,      [The 'diet' wrapper (default: diet)])
  92         AC_ARG_VAR(DIETFLAGS, [Flags passed to the 'diet' wrapper (default: -O)])
  93
  94         : ${DIET:=diet}
  95         : ${DIETFLAGS=-Os}
  96
  97         AC_ARG_ENABLE([dietlibc],
  98                       [AS_HELP_STRING([--disable-dietlibc],
  99                                       [do not use dietlibc resp. enforce its usage
 100                                        (with --enable-dietlibc) (default: autodetect dietlibc)])],
 101                       [case "$enableval" in
 102                           (yes) use_dietlibc=forced;;
 103                           (no)  use_dietlibc=forced_no;;
 104                           (*)   AC_MSG_ERROR(['$enableval' is not a valid value for --enable-dietlibc]);;
 105                        esac],
 106                       [which "$DIET" >/dev/null 2>/dev/null && use_dietlibc=detected || use_dietlibc=detected_no])
 107
 108         if test "$use_dietlibc" = detected -a "$2"; then
 109             _dietlibc_ver=$($DIET -v 2>&1 | sed '1p;d')
 110             _dietlibc_ver=${_dietlibc_ver##*diet version }
 111             _dietlibc_ver=${_dietlibc_ver##*dietlibc-}
 112             _dietlibc_ver_maj=${_dietlibc_ver%%.*}
 113             _dietlibc_ver_min=${_dietlibc_ver##*.}
 114             _dietlibc_ver_min=${_dietlibc_ver_min%%[[!0-9]]*}
 115             _dietlibc_cmp="$2"
 116             _dietlibc_cmp_maj=${_dietlibc_cmp%%.*}
 117             _dietlibc_cmp_min=${_dietlibc_cmp##*.}
 118
 119             ENSC_VERSION_DIETLIBC=$_dietlibc_ver_maj.$_dietlibc_ver_min
 120
 121             let _dietlibc_ver=_dietlibc_ver_maj*1000+_dietlibc_ver_min 2>/dev/null || _dietlibc_ver=0
 122             let _dietlibc_cmp=_dietlibc_cmp_maj*1000+_dietlibc_cmp_min
 123
 124             test $_dietlibc_ver -ge $_dietlibc_cmp || use_dietlibc=detected_old
 125         else
 126             ENSC_VERSION_DIETLIBC=
 127             _dietlibc_ver=-1
 128         fi
 129
 130         ENSC_VERSION_DIETLIBC_NUM=$_dietlibc_ver
 131         ensc_have_dietlibc=no
 132
 133         case x"$use_dietlibc" in
 134             xdetected)
 135                 AM_CONDITIONAL($1, true)
 136                 AC_MSG_RESULT([yes (autodetected, $ENSC_VERSION_DIETLIBC)])
 137                 ensc_have_dietlibc=yes
 138                 ;;
 139             xforced)
 140                 AM_CONDITIONAL($1, true)
 141                 AC_MSG_RESULT([yes (forced)])
 142                 ensc_have_dietlibc=yes
 143                 ;;
 144             xdetected_no)
 145                 AM_CONDITIONAL($1, false)
 146                 AC_MSG_RESULT([no (detected)])
 147                 ;;
 148             xdetected_old)
 149                 AM_CONDITIONAL($1, false)
 150                 AC_MSG_RESULT([no (too old; $2+ required, $ENSC_VERSION_DIETLIBC found)])
 151                 ;;
 152             xforced_no)
 153                 AM_CONDITIONAL($1, false)
 154                 AC_MSG_RESULT([no (forced)])
 155                 ;;
 156             *)
 157                 AC_MSG_ERROR([internal error, use_dietlibc was "$use_dietlibc"])
 158                 ;;
 159         esac
 160
 161         if test x"$ensc_have_dietlibc" != xno; then
 162                 _ENSC_DIETLIBC_C99
 163                 _ENSC_DIETLIBC_SYSCALL
 164         fi
 165 ])
 166