From 3a1109a53be172a92c63ebc5bdb69c45e78e9ca6 Mon Sep 17 00:00:00 2001
From: Jaremy Creechley <creechley@gmail.com>
Date: Thu, 12 Aug 2021 23:57:29 -0700
Subject: [PATCH] initial fix for compiling Nim on Zephyr RTOS (issue  #18684)
 (#18685)

* initial fix for compiling Nim on Zephyr RTOS (issue  #18684)

Co-authored-by: Jaremy J. Creechley <jaremy.creechley@wavebaselabs.com>
---
 lib/nimbase.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/nimbase.h b/lib/nimbase.h
index e480c55fd..a83bd3006 100644
--- a/lib/nimbase.h
+++ b/lib/nimbase.h
@@ -75,7 +75,8 @@ __AVR__
 #endif
 /* ------------------------------------------------------------------------- */
 
-#if defined(__GNUC__)
+#if defined(__GNUC__) && !defined(__ZEPHYR__)
+/* Zephyr does some magic in it's headers that override the GCC stdlib. This breaks that. */
 #  define _GNU_SOURCE 1
 #endif