Add simple rebuild command

Makefile

@@ -1,6 +1,6 @@
 .PHONY: \
-	all gdb \
-	lall lgdb \
+	all rb gdb \
+	lall lrb lgdb \
 	clean flash openocd shell wipe
 
 DOCKER_IMAGE ?= riscv-ubuntu
@@ -29,6 +29,14 @@ lall: ${MESON_DIR}
 ${MESON_DIR}: ${MESON_FILE} ${MESON_CROSS}
 	meson setup $@ --cross-file ${MESON_CROSS}
 
+rb: .have_docker
+	${DOCKER_CMD} ${DOCKER_IMAGE} make lrb
+	${TRANSLATE_COMPILE_COMMANDS}
+
+lrb: ${MESON_DIR}
+	meson compile -C ${MESON_DIR} --clean
+	meson compile -C ${MESON_DIR}
+
 clean:
 	rm -rf ${MESON_DIR}
 	rm -f .have_docker

README.md

@@ -20,9 +20,11 @@ Everything else is downloaded into the Docker container.
 - Building in Docker:
     - `make` (`make all`) — full build. Will create the docker image
       (expect 10-30min) if needed.
-    - `make wipe` — full clean and rebuild.
+    - `make rb` — clean and rebuild of just the build, not the docker image
+    - `make wipe` — full clean and rebuild including the docker image
 - Building locally, if you have your own toolchain already:
     - `make lall` ("local all")
+    - `make lrb` ("local rebuild")
     - `make clean lall` (equivalent to `make wipe`)
 - To flash:
     - `make flash`