compiler: new compiler option log-level

With log-level, we can obtain trace messages about
what file is being compiled and individual forms
within that file.

* autoload.c (compiler_set_entries): Intern the slot
symbol log-level.

* stdlib/compiler.tl (compile-opts): New slot, log-level.
(%warning-syms%): Add log-level to %warning-syms%.
Probably we need to rename this variable.
(compile-file-conditionally): Implement the two log
level messages.
(with-compile-opts): Allow/recognize integer option values.

* txr.1: Documented.

1 files changed, 1 insertions, 1 deletions

diff --git a/autoload.c b/autoload.c
index a8b5de56..1d8fa26e 100644
--- a/autoload.c
+++ b/autoload.c
@@ -673,7 +673,7 @@ static val compiler_set_entries(val fun)
   };
   val slname[] = {
     lit("shadow-fun"), lit("shadow-var"), lit("shadow-cross"),
-    lit("unused"), nil
+    lit("unused"), lit("log-level"), nil
   };
   autoload_sys_set(al_struct, sys_name, fun);
   autoload_set(al_struct, sname, fun);