improve frontend makefile

makefile

@@ -1,25 +1,45 @@
 FXSDK_PREFIX = ${HOME}/.local
 FXSDK_INSTALL_PATH = ${FXSDK_PREFIX}/lib/cmake/fxsdk
 
-all: configure build send
-rebuild: clean build
-tidy: format
+.PHONY: all
+all: build
 
-configure:
+# generate project with cmake
+.PHONY: generate
+generate: build/
+build/:
+	rm -rf build
 	cmake \
-		-B build \
+		-B build/ \
 		-DCMAKE_MODULE_PATH=${FXSDK_INSTALL_PATH} \
 		-DCMAKE_TOOLCHAIN_FILE=${FXSDK_INSTALL_PATH}/FXCG50.cmake \
 		-DFXSDK_CMAKE_MODULE_PATH=${FXSDK_INSTALL_PATH}
 
-build: configure
-	cmake --build build
+# build:foobar builds foobar with cmake
+# ie. cmake --build build/ --target foobar
+# (defaults to build = build:all)
+.PHONY: build
+build: build\:all
+.PHONY: build\:%
+build\:%: build/
+	cmake --build build/ --target $*
 
+# send addin to calc
+.PHONY: send
 send:
 	fxlink -s -w60 -f 'mass_storage;series_cg' *.g3a
 
+# project clean (remove build system cache)
+.PHONY: clean
 clean:
+	cmake --build build --target clean
+
+# remove all build products
+.PHONY: reset
+reset:
 	rm -rf *.g1a *.g3a build/ build-fx/ build-cg/
 
+# enforce formatting rules
+.PHONY: format
 format:
 	find src/ -name *.[c,h] -exec clang-format --verbose -i {} \;