require -g with jcache, fixes test_jcache

1 files changed, 7 insertions, 0 deletions

diff --git a/emcc b/emcc
index a32089c1..2a1a811d 100755
--- a/emcc
+++ b/emcc
@@ -441,6 +441,10 @@ Options that are modified or new in %s include:
                            (also a global property) does not invalidate
                            everything.
 
+                           Note that you must add -g during the linking
+                           stage (bitcode to JS), for jcache to work
+                           (otherwise, JS minification can confuse it).
+
   --clear-cache            Manually clears the cache of compiled
                            emscripten system libraries (libc++,
                            libc++abi, libc). This is normally
@@ -1030,6 +1034,9 @@ try:
     print >> sys.stderr, 'emcc: warning: disabling closure because debug info was requested'
     closure = False
 
+  if jcache:
+    assert keep_js_debug, 'must run jcache with -g during link stage' # js minification can confuse jcache
+
   if minify_whitespace is None:
     minify_whitespace = opt_level >= 2 and not keep_js_debug