m4/decl.m4

   1 #serial 2
   2
   3 AC_DEFUN(jm_CHECK_DECLARATION,
   4 [
   5   AC_REQUIRE([AC_HEADER_STDC])dnl
   6   test -z "$ac_cv_header_memory_h" && AC_CHECK_HEADERS(memory.h)
   7   test -z "$ac_cv_header_string_h" && AC_CHECK_HEADERS(string.h)
   8   test -z "$ac_cv_header_strings_h" && AC_CHECK_HEADERS(strings.h)
   9   test -z "$ac_cv_header_stdlib_h" && AC_CHECK_HEADERS(stdlib.h)
  10   test -z "$ac_cv_header_unistd_h" && AC_CHECK_HEADERS(unistd.h)
  11   AC_MSG_CHECKING([whether $1 is declared])
  12   AC_CACHE_VAL(jm_cv_func_decl_$1,
  13     [AC_TRY_COMPILE([
  14 #include <stdio.h>
  15 #ifdef HAVE_STRING_H
  16 # if !STDC_HEADERS && HAVE_MEMORY_H
  17 #  include <memory.h>
  18 # endif
  19 # include <string.h>
  20 #else
  21 # ifdef HAVE_STRINGS_H
  22 #  include <strings.h>
  23 # endif
  24 #endif
  25 #ifdef HAVE_STDLIB_H
  26 # include <stdlib.h>
  27 #endif
  28 #ifdef HAVE_UNISTD_H
  29 # include <unistd.h>
  30 #endif],
  31       [
  32 #ifndef $1
  33 char *(*pfn) = (char *(*)) $1
  34 #endif
  35       ],
  36       eval "jm_cv_func_decl_$1=yes",
  37       eval "jm_cv_func_decl_$1=no")])
  38
  39   if eval "test \"`echo '$jm_cv_func_decl_'$1`\" = yes"; then
  40     AC_MSG_RESULT(yes)
  41     ifelse([$2], , :, [$2])
  42   else
  43     AC_MSG_RESULT(no)
  44     ifelse([$3], , , [$3
  45 ])dnl
  46   fi
  47 ])dnl
  48
  49 dnl jm_CHECK_DECLARATIONS(FUNCTION... [, ACTION-IF-DECLARED
  50 dnl                       [, ACTION-IF-NOT-DECLARED]])
  51 AC_DEFUN(jm_CHECK_DECLARATIONS,
  52 [
  53   for jm_func in $1
  54   do
  55     jm_CHECK_DECLARATION($jm_func,
  56     [
  57       jm_tr_func=HAVE_DECL_`echo $jm_func | tr abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ`
  58       AC_DEFINE_UNQUOTED($jm_tr_func) $2], $3)dnl
  59   done
  60 ])