loader: add docker build for linux

alchitry-loader/Makefile

@@ -0,0 +1,32 @@
+sources = $(wildcard src/*.cpp)
+objects = $(sources:.cpp=.o)
+os = $(shell uname -s)
+static_libs = lib/$(os)/libftd2xx.a
+libs = -lpthread
+
+CXXFLAGS = -std=c++11
+
+export DOCKER_BUILDKIT=1
+
+# Assume target is Mac OS if build host is Mac OS; any other host targets Linux
+ifeq ($(os), Darwin)
+	libs += -lobjc -framework IOKit -framework CoreFoundation
+else
+	libs += -lrt
+endif
+
+loader: $(objects)  ## build the loader executable
+	$(CXX) $(LDFLAGS) -o $@ $^ $(static_libs) $(libs)
+
+build:  ## build the loader in docker (linux)
+	docker build -o . .
+
+.PHONY: clean
+clean:
+	rm -rf loader $(objects)
+
+.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