include libopencm3 as submodule

.gitmodules

@@ -7,3 +7,6 @@
 [submodule "trezor-qrenc"]
 	path = trezor-qrenc
 	url = https://github.com/trezor/trezor-qrenc.git
+[submodule "libopencm3"]
+	path = libopencm3
+	url = https://github.com/libopencm3/libopencm3.git

Dockerfile

@@ -9,12 +9,3 @@ RUN apt-get update
 # install build tools and dependencies
 
 RUN apt-get install -y build-essential git python gcc-arm-none-eabi
-
-# clone the source code
-
-RUN git clone https://github.com/libopencm3/libopencm3
-
-# build libopencm3
-
-ENV LIBOPENCM3_GITREV 7b29caed1a726b5cef4c269b6a6ef7a1f1dd105c
-RUN cd libopencm3 && git checkout $LIBOPENCM3_GITREV && make

Makefile.include

@@ -1,5 +1,5 @@
 TOP_DIR       := $(dir $(abspath $(lastword $(MAKEFILE_LIST))))
-TOOLCHAIN_DIR ?= $(TOP_DIR)/../libopencm3
+TOOLCHAIN_DIR ?= $(TOP_DIR)libopencm3
 
 PREFIX ?= arm-none-eabi-
 CC      = $(PREFIX)gcc
@@ -42,9 +42,9 @@ CFLAGS   += $(OPTFLAGS) \
             -DSTM32F2 \
             -I$(TOOLCHAIN_DIR)/include \
             -I$(TOP_DIR) \
-            -I$(TOP_DIR)/gen \
-            -I$(TOP_DIR)/trezor-crypto \
-            -I$(TOP_DIR)/trezor-qrenc
+            -I$(TOP_DIR)gen \
+            -I$(TOP_DIR)trezor-crypto \
+            -I$(TOP_DIR)trezor-qrenc
 
 ifdef APPVER
 CFLAGS   += -DAPPVER=$(APPVER)

firmware-docker-build.sh

@@ -8,6 +8,9 @@ docker run -t -v $(pwd)/output:/output $IMAGETAG /bin/sh -c "\
 	cd trezor-mcu && \
 	git checkout $FIRMWARETAG && \
 	git submodule update --init && \
+	cd libopencm3 &&
+	make && \
+	cd .. && \
 	make && \
 	cd firmware && \
 	make && \

libopencm3

@@ -0,0 +1 @@
+Subproject commit b1049f9a6f43882968dcf82ca1df3f1eee67e367