+check_gcc:
+ $(GCC) --version|grep "6\.3" || false
+ @$(GCC) -Werror -mindirect-branch=thunk-extern -mindirect-branch-register -c -x c /dev/null -o check_gcc.o \
+ || ( rm -f check_gcc.o; \
+ echo "Please install gcc-6 packages with indirect thunk / RETPOLINE support"; \
+ false)
+ @rm -f check_gcc.o