m4/decl.m4

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