zcbor: Make changes to zcbor code to satisfy mynewt compile options

bit-casting between uint and float.

Signed-off-by: Øyvind Rønningstad <oyvind.ronningstad@nordicsemi.no>

Author: oyvindronningstad

boot/zcbor/src/zcbor_common.c

@@ -355,23 +355,30 @@ float zcbor_float16_to_32(uint16_t input)
 				: (expo + (F32_BIAS - F16_BIAS));
 		uint32_t value32 = (sign << F32_SIGN_OFFS) | (new_expo << F32_EXPO_OFFS)
 			| (mantissa << (F32_EXPO_OFFS - F16_EXPO_OFFS));
-		return *(float *)&value32;
+		float result;
+
+		memcpy(&result, &value32, sizeof(result));
+		return result;
 	}
 }
 
 
 uint16_t zcbor_float32_to_16(float input)
 {
-	uint32_t value32 = *(uint32_t *)&input;
+	uint32_t value32;
+
+	memcpy(&value32, &input, sizeof(value32));
 
 	uint32_t sign = value32 >> F32_SIGN_OFFS;
 	uint32_t expo = (value32 >> F32_EXPO_OFFS) & F32_EXPO_MSK;
 	uint32_t mantissa = value32 & F32_MANTISSA_MSK;
 
 	uint16_t value16 = (uint16_t)(sign << F16_SIGN_OFFS);
 
+	uint32_t abs_value32 = value32 & ~(1 << F32_SIGN_OFFS);
 	float abs_input;
-	*(uint32_t *)&abs_input = value32 & ~(1 << F32_SIGN_OFFS);
+
+	memcpy(&abs_input, &abs_value32, sizeof(abs_input));
 
 	if (abs_input <= (F16_MIN / 2)) {
 		/* 0 or too small for float16. Round down to 0. value16 is already correct. */