From 3dfafde027db380284fd1faacfc56cf47e5fb4c2 Mon Sep 17 00:00:00 2001
From: Kaspar Schleiser <kaspar@schleiser.de>
Date: Fri, 5 Aug 2016 10:05:40 +0200
Subject: [PATCH] cpu: cortexm_common: fix compile warning

---
 cpu/cortexm_common/vectors_cortexm.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/cpu/cortexm_common/vectors_cortexm.c b/cpu/cortexm_common/vectors_cortexm.c
index b72de9940..a5b5c3812 100644
--- a/cpu/cortexm_common/vectors_cortexm.c
+++ b/cpu/cortexm_common/vectors_cortexm.c
@@ -205,8 +205,11 @@ __attribute__((used)) void hard_fault_handler(uint32_t* sp, uint32_t corrupted,
     uint32_t dfsr  = SCB->DFSR;
     uint32_t afsr  = SCB->AFSR;
 #endif
-    uint32_t pc;
-    uint32_t* orig_sp;
+
+    /* Initialize these variables even if they're never used uninitialized.
+     * Fixes wrong compiler warning by gcc < 6.0. */
+    uint32_t pc = 0;
+    uint32_t* orig_sp = NULL;
 
     /* Check if the ISR stack overflowed previously. Not possible to detect
      * after output may also have overflowed it. */