-[AC_REQUIRE([AC_TYPE_SIZE_T])dnl
-AC_CACHE_CHECK([for GNU libc compatible calloc], [ac_cv_func_calloc_0_nonnull],
-[AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
- [[exit (!calloc (0, 0) || calloc ((size_t) -1 / 8 + 1, 8));]])],
- [ac_cv_func_calloc_0_nonnull=yes],
- [ac_cv_func_calloc_0_nonnull=no],
- [ac_cv_func_calloc_0_nonnull=no])])
-AS_IF([test $ac_cv_func_calloc_0_nonnull = yes], [$1], [$2])
+[
+ AC_REQUIRE([AC_TYPE_SIZE_T])dnl
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CACHE_CHECK([for GNU libc compatible calloc],
+ [ac_cv_func_calloc_0_nonnull],
+ [AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [AC_INCLUDES_DEFAULT],
+ [[int result = 0;
+ if (!calloc (0, 0))
+ result |= 1;
+ if (calloc ((size_t) -1 / 8 + 1, 8))
+ result |= 2;
+ return result;
+ ]])],
+ [ac_cv_func_calloc_0_nonnull=yes],
+ [ac_cv_func_calloc_0_nonnull=no],
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) ac_cv_func_calloc_0_nonnull="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) ac_cv_func_calloc_0_nonnull="guessing no" ;;
+ esac
+ ])])
+ case "$ac_cv_func_calloc_0_nonnull" in
+ *yes)
+ $1
+ ;;
+ *)
+ $2
+ ;;
+ esac