m4/bison-decl.m4

   1 dnl FIXME: This should be soon obsoleted by AC_CHECK_DECL.
   2
   3 dnl See whether we need a declaration for a function.
   4 dnl BISON_NEED_DECLARATION(FUNCTION [, EXTRA-HEADER-FILES])
   5 AC_DEFUN(BISON_NEED_DECLARATION,
   6 [AC_MSG_CHECKING([whether $1 must be declared])
   7 AC_CACHE_VAL(bison_cv_decl_needed_$1,
   8 [AC_TRY_COMPILE([
   9 #include <stdio.h>
  10 #ifdef HAVE_STRING_H
  11 #include <string.h>
  12 #else
  13 #ifdef HAVE_STRINGS_H
  14 #include <strings.h>
  15 #endif
  16 #endif
  17 #ifdef HAVE_STDLIB_H
  18 #include <stdlib.h>
  19 #endif
  20 #ifdef HAVE_UNISTD_H
  21 #include <unistd.h>
  22 #endif
  23 #ifndef HAVE_RINDEX
  24 #define rindex strrchr
  25 #endif
  26 #ifndef HAVE_INDEX
  27 #define index strchr
  28 #endif
  29 $2],
  30 [char *(*pfn) = (char *(*)) $1],
  31 eval "bison_cv_decl_needed_$1=no", eval "bison_cv_decl_needed_$1=yes")])
  32 if eval "test \"`echo '$bison_cv_decl_needed_'$1`\" = yes"; then
  33   AC_MSG_RESULT(yes)
  34   bison_tr_decl=NEED_DECLARATION_`echo $1 | tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
  35   AC_DEFINE_UNQUOTED($bison_tr_decl)
  36 else
  37   AC_MSG_RESULT(no)
  38 fi
  39 ])dnl
  40
  41 dnl Check multiple functions to see whether each needs a declaration.
  42 dnl BISON_NEED_DECLARATIONS(FUNCTION... [, EXTRA-HEADER-FILES])
  43 AC_DEFUN(BISON_NEED_DECLARATIONS,
  44 [for ac_func in $1
  45 do
  46 BISON_NEED_DECLARATION($ac_func, $2)
  47 done
  48 ])