m4/decl.m4

   1 AC_DEFUN(jm_CHECK_DECLARATION,
   2 [
   3   AC_REQUIRE([AC_HEADER_STDC])dnl
   4   test -z "$ac_cv_header_memory_h" && AC_CHECK_HEADERS(memory.h)
   5   test -z "$ac_cv_header_string_h" && AC_CHECK_HEADERS(string.h)
   6   test -z "$ac_cv_header_strings_h" && AC_CHECK_HEADERS(strings.h)
   7   test -z "$ac_cv_header_stdlib_h" && AC_CHECK_HEADERS(stdlib.h)
   8   test -z "$ac_cv_header_unistd_h" && AC_CHECK_HEADERS(unistd.h)
   9   AC_MSG_CHECKING([whether $1 is declared])
  10   AC_CACHE_VAL(jm_cv_func_decl_$1,
  11     [AC_TRY_COMPILE([
  12 #include <stdio.h>
  13 #ifdef HAVE_STRING_H
  14 # if !STDC_HEADERS && HAVE_MEMORY_H
  15 #  include <memory.h>
  16 # endif
  17 # include <string.h>
  18 #else
  19 # ifdef HAVE_STRINGS_H
  20 #  include <strings.h>
  21 # endif
  22 #endif
  23 #ifdef HAVE_STDLIB_H
  24 # include <stdlib.h>
  25 #endif
  26 #ifdef HAVE_UNISTD_H
  27 # include <unistd.h>
  28 #endif],
  29       [
  30 #ifndef $1
  31 char *(*pfn) = (char *(*)) $1
  32 #endif
  33       ],
  34       eval "jm_cv_func_decl_$1=yes",
  35       eval "jm_cv_func_decl_$1=no")])
  36
  37   if eval "test \"`echo '$jm_cv_func_decl_'$1`\" = yes"; then
  38     AC_MSG_RESULT(yes)
  39     ifelse([$2], , :, [$2])
  40   else
  41     AC_MSG_RESULT(no)
  42     ifelse([$3], , , [$3
  43 ])dnl
  44   fi
  45 ])dnl
  46
  47 dnl jm_CHECK_DECLARATIONS(FUNCTION... [, ACTION-IF-DECLARED
  48 dnl                       [, ACTION-IF-NOT-DECLARED]])
  49 AC_DEFUN(jm_CHECK_DECLARATIONS,
  50 [
  51   for jm_func in $1
  52   do
  53     jm_CHECK_DECLARATION($jm_func,
  54     [
  55       jm_tr_func=HAVE_DECLARATION_`echo $jm_func | tr abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ`
  56       AC_DEFINE_UNQUOTED($jm_tr_func) $2], $3)dnl
  57   done
  58 ])