contrib/bmake/aclocal.m4

   1 dnl RCSid:
   2 dnl     $Id: aclocal.m4,v 1.5 2003/03/06 21:21:30 sjg Exp $
   3 dnl
   4
   5 dnl
   6 dnl AC_CHECK_HEADER_HAS(HEADER, PATTERN, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]))
   7
   8 AC_DEFUN(AC_CHECK_HEADER_HAS,
   9 [dnl first check if header exists and if so, see if it contains PATTERN
  10 ac_has_hdr=`echo "ac_cv_header_$1" | sed 'y%./+-%__p_%'`
  11 ac_has_it=`echo "ac_cv_header_$1"_$2 | sed 'y%./+-%__p_%'`
  12 if eval "test \"`echo x'$'$ac_has_hdr`\" = x"; then
  13   AC_CHECK_HEADER($1)
  14 fi
  15 if eval "test \"`echo '$'$ac_has_hdr`\" = yes"; then
  16   ac_x=HAVE_`echo "$1" | sed 'y%abcdefghijklmnopqrstuvwxyz./-%ABCDEFGHIJKLMNOPQRSTUVWXYZ___%'`
  17   AC_DEFINE_UNQUOTED($ac_x)
  18   AC_MSG_CHECKING([if $1 has $2])
  19   AC_CACHE_VAL($ac_has_it,
  20                [eval $ac_has_it=no
  21                 AC_EGREP_HEADER($2, $1, eval "$ac_has_it=yes")])
  22
  23   if eval "test \"`echo '$'$ac_has_it`\" = yes"; then
  24     AC_MSG_RESULT(yes)
  25     ac_x=HAVE_`echo "$1"_$2 | sed 'y%abcdefghijklmnopqrstuvwxyz./-%ABCDEFGHIJKLMNOPQRSTUVWXYZ___%'`
  26     AC_DEFINE_UNQUOTED($ac_x)
  27     ifelse([$3], , :, [$3])
  28   else
  29     AC_MSG_RESULT(no)
  30     ifelse([$4], , , [$4
  31 ])dnl
  32   fi
  33 fi
  34 ])
  35
  36 dnl AC_EGREP(PATTERN, FILE, ACTION-IF-FOUND [,
  37 dnl                 ACTION-IF-NOT-FOUND])
  38 AC_DEFUN(AC_EGREP,
  39 [
  40 dnl Prevent m4 from eating character classes:
  41 changequote(, )dnl
  42 if egrep "$1" $2 >/dev/null 2>&1; then
  43 changequote([, ])dnl
  44   ifelse([$3], , :, [$3])
  45 ifelse([$4], , , [else
  46   $4
  47 ])dnl
  48 fi
  49 ])
  50
  51 dnl
  52 dnl Test for __attribute__
  53 dnl
  54
  55 AC_DEFUN(AC_C___ATTRIBUTE__, [
  56 AC_MSG_CHECKING(for __attribute__)
  57 AC_CACHE_VAL(ac_cv___attribute__, [
  58 AC_TRY_COMPILE([
  59 #include <stdlib.h>
  60 ],
  61 [
  62 static void foo(void) __attribute__ ((noreturn));
  63
  64 static void
  65 foo(void)
  66 {
  67   exit(1);
  68 }
  69 ],
  70 ac_cv___attribute__=yes,
  71 ac_cv___attribute__=no)])
  72 if test "$ac_cv___attribute__" = "yes"; then
  73   AC_DEFINE(HAVE___ATTRIBUTE__, 1, [define if your compiler has __attribute__])
  74 fi
  75 AC_MSG_RESULT($ac_cv___attribute__)
  76 ])
  77