From d0a147f5bbcd59a9f01b7bedcf7c4be92f059b35 Mon Sep 17 00:00:00 2001 From: Dean Camera Date: Tue, 26 Aug 2014 21:18:59 +1000 Subject: Patched the LUFA build system to work around a GCC code generation bug in newer toolchains when building for larger FLASH memory devices (thanks to demultiplexer) --- LUFA/Build/lufa_build.mk | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'LUFA/Build') diff --git a/LUFA/Build/lufa_build.mk b/LUFA/Build/lufa_build.mk index 1bdfa1d72..b9b144aee 100644 --- a/LUFA/Build/lufa_build.mk +++ b/LUFA/Build/lufa_build.mk @@ -199,6 +199,12 @@ ifeq ($(LINKER_RELAXATIONS), Y) BASE_CC_FLAGS += -mrelax endif +# This flag is required for bootloaders as GCC will emit invalid jump table +# assembly code for devices with large amounts of flash; the jump table target +# is extracted from FLASH without using the correct ELPM instruction, resulting +# in a pseudo-random jump target. +BASE_CC_FLAGS += -fno-jump-tables + # Additional language specific compiler flags BASE_C_FLAGS := -x c -O$(OPTIMIZATION) -std=$(C_STANDARD) -Wstrict-prototypes BASE_CPP_FLAGS := -x c++ -O$(OPTIMIZATION) -std=$(CPP_STANDARD) -- cgit v1.2.3