m4/decl.m4

   1 AC_DEFUN(jm_CHECK_DECLARATION,
   2 [
   3 test -z "$ac_cv_header_strings_h" && AC_CHECK_HEADERS(strings.h)
   4 test -z "$ac_cv_header_stdlib_h" && AC_CHECK_HEADERS(stdlib.h)
   5 test -z "$ac_cv_header_unistd_h" && AC_CHECK_HEADERS(unistd.h)
   6 AC_MSG_CHECKING([whether $1 is declared])
   7 AC_CACHE_VAL(jm_cv_func_decl_$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 [
  24 #ifndef $1
  25 char *(*pfn) = (char *(*)) $1
  26 #endif
  27 ],
  28   eval "jm_cv_func_decl_$1=yes",
  29   eval "jm_cv_func_decl_$1=no")])
  30
  31 if eval "test \"`echo '$jm_cv_func_decl_'$1`\" = yes"; then
  32   AC_MSG_RESULT(yes)
  33   ifelse([$2], , :, [$2])
  34 else
  35   AC_MSG_RESULT(no)
  36   ifelse([$3], , , [$3
  37 ])dnl
  38 fi
  39 ])dnl
  40
  41 dnl jm_CHECK_DECLARATIONS(FUNCTION... [, ACTION-IF-DECLARED
  42 dnl                       [, ACTION-IF-NOT-DECLARED]])
  43 AC_DEFUN(jm_CHECK_DECLARATIONS,
  44 [
  45   for jm_func in $1
  46   do
  47     jm_CHECK_DECLARATION($jm_func,
  48     [
  49       lower=abcdefghijklmnopqrstuvwxyz
  50       upper=ABCDEFGHIJKLMNOPQRSTUVWXYZ
  51       jm_tr_func=HAVE_DECLARATION_`echo $jm_func | tr $lower $upper`
  52       AC_DEFINE_UNQUOTED($jm_tr_func) $2], $3)dnl
  53   done
  54 ])