Update cook to take headers for natives.

This should help incremental building.

2 files changed, 6 insertions, 1 deletions

diff --git a/auxlib/cook.janet b/auxlib/cook.janet
index 9c104190..c996c54e 100644
--- a/auxlib/cook.janet
+++ b/auxlib/cook.janet
@@ -248,7 +248,8 @@
   (def cc (opt opts :compiler COMPILER))
   (def cflags (getcflags opts))
   (def defines (interpose " " (make-defines (opt opts :defines {}))))
-  (rule dest [src]
+  (def headers (or (opts :headers) []))
+  (rule dest [src ;headers]
         (print "compiling " dest "...")
         (if is-win
           (shell cc ;defines "/c" ;cflags (string "/Fo" dest) src)
diff --git a/src/core/capi.c b/src/core/capi.c
index 2a97c4a3..a22ee850 100644
--- a/src/core/capi.c
+++ b/src/core/capi.c
@@ -262,8 +262,12 @@ uint64_t janet_getflags(const Janet *argv, int32_t n, const char *flags) {
         for (int32_t i = 0; i < flen; i++) {
             if (((uint8_t) flags[i]) == keyw[j]) {
                 ret |= 1ULL << i;
+                goto found;
             }
         }
+        janet_panicf("unexpected flag %c, expected one of \"%s\"", (char) keyw[j], flags);
+found:
+        ;
     }
     return ret;
 }