tweak sign and overflow checks

1 files changed, 4 insertions, 0 deletions

diff --git a/tests/zlib/trees.c b/tests/zlib/trees.c
index 56e9bb1c..18be5013 100644
--- a/tests/zlib/trees.c
+++ b/tests/zlib/trees.c
@@ -722,7 +722,11 @@ local void scan_tree (s, tree, max_code)
     int min_count = 4;         /* min repeat count */
 
     if (nextlen == 0) max_count = 138, min_count = 3;
+#ifndef EMSCRIPTEN_OPTS
     tree[max_code+1].Len = (ush)0xffff; /* guard */
+#else
+    tree[max_code+1].Len = (ush)0x7fff; /* guard. Emscripten: Prevents llvm_gcc from creating '-1' which needs unsigning later */
+#endif
 
     for (n = 0; n <= max_code; n++) {
         curlen = nextlen; nextlen = tree[n+1].Len;