arm: improve makefile

arm/makefile

@@ -28,7 +28,11 @@ app_objects = app_init.o crash.o main.o uart.o stdlib.o async.o trace.o $(source
 
 CPPFLAGS += $(includes)
 
-all: bootloader.elf app.bin
+.PHONY: app
+app: app.bin  ## Build the main app
+
+.PHONY: bootloader  ## Build the bootloader
+bootloader: bootloader.elf
 
 %.bin: %.elf
 	$(OBJCOPY) -O binary $< $@
@@ -39,8 +43,6 @@ bootloader.elf: $(bootloader_objects) bootloader.ld
 app.elf: $(app_objects) app.ld
 	$(LD) -Wl,-Tapp.ld $(LDFLAGS) -o $@ $(app_objects)
 
-.PHONY: clean test
-
 deps = $(app_objects:.o=.d) $(bootloader_objects:.o=.d)
 
 HOSTCXX = clang++
@@ -56,7 +58,8 @@ ASAN_CFLAGS = $(HOSTCFLAGS) -fsanitize=address -fsanitize=leak
 
 tests = ring_buffer_test.run async_test_asan.run async_test_tsan.run uart_test_tsan.run
 
-test: $(tests)
+.PHONY: test
+test: $(tests)  ## Run tests
 
 test/async_test_asan: async_test.cc async.host.o lock.host.o
 test/async_test_tsan: async_test.cc async.host.o lock.host.o
@@ -78,15 +81,30 @@ test/%_asan: | mktest
 test/%_tsan: | mktest
 	$(HOSTCXX) $(TSAN_CFLAGS) -o $@ $^ $(HOSTLDFLAGS)
 
+.PHONY: mktest
 mktest:
 	mkdir -p test
 
 test_deps = async.host.d lock.host.d fake_uart.host.d
 
+.PHONY: dev-image
+dev-image:
+	docker build -t arm-dev -f dev.dockerfile .
 
-clean:
+.PHONY: dev
+dev: dev-image  ## Run a dev container
+	docker run -it --rm -v $(CURDIR):/workspace -w /workspace arm-dev
+
+.PHONY: clean
+clean:  ## Remove generated files
 	rm -rf *.elf *.bin $(app_objects) $(bootloader_objects) $(deps)
 	rm -rf test/ *.dSYM $(test_deps) *.o
 
--include $(deps)
--include $(test_deps)
+.PHONY: help
+help:           ## Show this help
+	@echo Noteworthy targets:
+	@egrep '^[a-zA-Z_-]+:.*?## .*$$' $(firstword $(MAKEFILE_LIST)) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-20s\033[0m %s\n", $$1, $$2}'
+.DEFAULT_GOAL := help
+
+#-include $(deps)
+#-include $(test_deps)

arm/uart.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <cstdint>
 #include <span>
 #include <string_view>