From 44f0a4d1e7a315c8d2b21fc4b0471d88e382a91e Mon Sep 17 00:00:00 2001
From: Damien George <damien.p.george@gmail.com>
Date: Mon, 18 Sep 2017 23:53:33 +1000
Subject: [PATCH] py/mpconfig.h: Add note that using computed gotos in VM is
 not C99.

---
 py/mpconfig.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/py/mpconfig.h b/py/mpconfig.h
index 63438a846..b93f851d6 100644
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@@ -383,6 +383,8 @@
 
 // Whether to use computed gotos in the VM, or a switch
 // Computed gotos are roughly 10% faster, and increase VM code size by a little
+// Note: enabling this will use the gcc-specific extensions of ranged designated
+// initialisers and addresses of labels, which are not part of the C99 standard.
 #ifndef MICROPY_OPT_COMPUTED_GOTO
 #define MICROPY_OPT_COMPUTED_GOTO (0)
 #endif
-- 
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