1 files changed, 77 insertions, 0 deletions
diff --git a/m4/vararg.m4 b/m4/vararg.m4
new file mode 100644
index 0000000..6bc8dcc
--- /dev/null
+++ b/m4/vararg.m4
@@ -0,0 +1,77 @@
+AC_DEFUN([DOVECOT_VA_COPY], [
+  AC_CACHE_CHECK([for an implementation of va_copy()],lib_cv_va_copy,[
+          AC_RUN_IFELSE([AC_LANG_SOURCE([[
+          #include <stdarg.h>
+          #include <stdlib.h>
+          void f (int i, ...) {
+          va_list args1, args2;
+          va_start (args1, i);
+          va_copy (args2, args1);
+          if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
+            exit (1);
+          va_end (args1); va_end (args2);
+          }
+          int main() {
+            f (0, 42);
+            return 0;
+          }]])],
+          [lib_cv_va_copy=yes],
+          [lib_cv_va_copy=no],[])
+  ])
+  AC_CACHE_CHECK([for an implementation of __va_copy()],lib_cv___va_copy,[
+          AC_RUN_IFELSE([AC_LANG_SOURCE([[
+          #include <stdarg.h>
+          #include <stdlib.h>
+          void f (int i, ...) {
+          va_list args1, args2;
+          va_start (args1, i);
+          __va_copy (args2, args1);
+          if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
+            exit (1);
+          va_end (args1); va_end (args2);
+          }
+          int main() {
+            f (0, 42);
+            return 0;
+          }]])],
+          [lib_cv___va_copy=yes],
+          [lib_cv___va_copy=no],[])
+  ])
+  
+  if test "x$lib_cv_va_copy" = "xyes"; then
+    va_copy_func=va_copy
+  else if test "x$lib_cv___va_copy" = "xyes"; then
+    va_copy_func=__va_copy
+  fi
+  fi
+  
+  if test -n "$va_copy_func"; then
+    AC_DEFINE_UNQUOTED(VA_COPY,$va_copy_func,[A 'va_copy' style function])
+  fi
+])
+
+AC_DEFUN([DOVECOT_VA_COPY_BYVAL], [
+  AC_CACHE_CHECK([whether va_lists can be copied by value],lib_cv_va_val_copy,[
+          AC_RUN_IFELSE([AC_LANG_SOURCE([[
+          #include <stdarg.h>
+          #include <stdlib.h>
+          void f (int i, ...) {
+          va_list args1, args2;
+          va_start (args1, i);
+          args2 = args1;
+          if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
+            exit (1);
+          va_end (args1); va_end (args2);
+          }
+          int main() {
+            f (0, 42);
+            return 0;
+          }]])],
+          [lib_cv_va_val_copy=yes],
+          [lib_cv_va_val_copy=no],[])
+  ])
+  
+  if test "x$lib_cv_va_val_copy" = "xno"; then
+    AC_DEFINE(VA_COPY_AS_ARRAY,1, ['va_lists' cannot be copied as values])
+  fi
+])