Dogcows Code - chaz/tar/blob - m4/decl.m4

   1 #serial 5
   2
   3 AC_DEFUN(jm_CHECK_DECLARATION,
   4 [
   5   AC_MSG_CHECKING([whether $1 is declared])
   6   AC_CACHE_VAL(jm_cv_func_decl_$1,
   7     [AC_TRY_COMPILE($2,
   8       [
   9 #ifndef $1
  10 char *(*pfn) = (char *(*)) $1
  11 #endif
  12       ],
  13       eval "jm_cv_func_decl_$1=yes",
  14       eval "jm_cv_func_decl_$1=no")])
  15
  16   if eval "test \"`echo '$jm_cv_func_decl_'$1`\" = yes"; then
  17     AC_MSG_RESULT(yes)
  18     ifelse([$3], , :, [$3])
  19   else
  20     AC_MSG_RESULT(no)
  21     ifelse([$4], , , [$4
  22 ])dnl
  23   fi
  24 ])dnl
  25
  26 dnl jm_CHECK_DECLARATIONS(INCLUDES, FUNCTION... [, ACTION-IF-DECLARED
  27 dnl                       [, ACTION-IF-NOT-DECLARED]])
  28 AC_DEFUN(jm_CHECK_DECLARATIONS,
  29 [
  30   for jm_func in $2
  31   do
  32     jm_CHECK_DECLARATION($jm_func, $1,
  33     [
  34       jm_tr_func=HAVE_DECL_`echo $jm_func | tr abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ`
  35       AC_DEFINE_UNQUOTED($jm_tr_func) $3], $4)dnl
  36   done
  37 ])