From 7b8ebfc8f995ce6cb2f1474241ba5d2bf4ca7d7f Mon Sep 17 00:00:00 2001
From: borisbstyle <dreambb1982@gmail.com>
Date: Wed, 2 Nov 2016 22:22:51 +0100
Subject: [PATCH] Disable -flto optimiser option for F3, F4 and F7

---
 Makefile                       | 4 ++++
 src/main/common/filter.c       | 2 +-
 src/main/drivers/pwm_output.c  | 2 +-
 src/main/telemetry/smartport.c | 2 +-
 4 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index fa5bed9106..c6ccb2b20f 100644
--- a/Makefile
+++ b/Makefile
@@ -734,7 +734,11 @@ OPTIMIZE    = -O0
 LTO_FLAGS   = $(OPTIMIZE)
 else
 OPTIMIZE    = -Os
+ifeq ($(TARGET),$(filter $(TARGET),$(F1_TARGETS)))
 LTO_FLAGS   = -flto -fuse-linker-plugin $(OPTIMIZE)
+else
+LTO_FLAGS   = -fuse-linker-plugin $(OPTIMIZE)
+endif
 endif
 
 DEBUG_FLAGS = -ggdb3 -DDEBUG
diff --git a/src/main/common/filter.c b/src/main/common/filter.c
index 98d82919e4..6fdf6e5c59 100644
--- a/src/main/common/filter.c
+++ b/src/main/common/filter.c
@@ -75,7 +75,7 @@ void biquadFilterInit(biquadFilter_t *filter, float filterFreq, uint32_t refresh
     const float cs = cosf(omega);
     const float alpha = sn / (2 * Q);
 
-    float b0, b1, b2, a0, a1, a2;
+    float b0 = 0, b1 = 0, b2 = 0, a0 = 0, a1 = 0, a2 = 0;
 
     switch (filterType) {
         case FILTER_LPF:
diff --git a/src/main/drivers/pwm_output.c b/src/main/drivers/pwm_output.c
index 59f01726bb..ea28c3e48e 100644
--- a/src/main/drivers/pwm_output.c
+++ b/src/main/drivers/pwm_output.c
@@ -156,7 +156,7 @@ void pwmCompleteMotorUpdate(uint8_t motorCount)
 
 void motorInit(const motorConfig_t *motorConfig, uint16_t idlePulse, uint8_t motorCount)
 {
-    uint32_t timerMhzCounter;
+    uint32_t timerMhzCounter = 0;
     pwmWriteFuncPtr pwmWritePtr;
     bool useUnsyncedPwm = motorConfig->useUnsyncedPwm;
     bool isDigital = false;
diff --git a/src/main/telemetry/smartport.c b/src/main/telemetry/smartport.c
index 02fdbac1ae..c9be67089c 100644
--- a/src/main/telemetry/smartport.c
+++ b/src/main/telemetry/smartport.c
@@ -620,7 +620,7 @@ void handleSmartPortTelemetry(void)
         smartPortIdCnt++;
 
         int32_t tmpi;
-        uint32_t tmp2;
+        uint32_t tmp2 = 0;
         static uint8_t t1Cnt = 0;
         static uint8_t t2Cnt = 0;