redistribute .PHONY declarations

Makefile

 SHELL := /bin/bash
 
 build: submodules unicorn minigeth_mips minigeth_default_arch mipsevm contracts
+.PHONY: build
 
 # Approximation, use `make unicorn_rebuild` to force.
 unicorn/build: unicorn/CMakeLists.txt
@@ -12,10 +13,12 @@ unicorn: unicorn/build
 	# The Go linker / runtime expects these to be there!
 	cp unicorn/build/libunicorn.so.1 unicorn
 	cp unicorn/build/libunicorn.so.2 unicorn
+.PHONY: unicorn
 
 unicorn_rebuild:
 	touch unicorn/CMakeLists.txt
 	make unicorn
+.PHONY: unicorn_rebuild
 
 submodules:
 	# CI will checkout submodules on its own (and fails on these commands)
@@ -23,18 +26,23 @@ submodules:
 		git submodule init; \
 		git submodule update; \
 	fi
+.PHONY: submodules
 
 minigeth_mips:
 	cd mipigo && ./build.sh
+.PHONY: minigeth_mips
 
 minigeth_default_arch:
 	cd minigeth && go build
+.PHONY: minigeth_default_arch
 
 mipsevm:
 	cd mipsevm && go build
+.PHONY: mipsevm
 
 contracts: nodejs
 	npx hardhat compile
+.PHONY: contracts
 
 nodejs:
 	if [ -x "$(command -v pnpm)" ]; then \
@@ -42,6 +50,7 @@ nodejs:
 	else \
 		npm install; \
 	fi
+.PHONY: nodejs
 
 # Must be a definition and not a rule, otherwise it gets only called once and
 # not before each test as we wish.
@@ -52,6 +61,7 @@ endef
 
 clear_cache:
 	$(call clear_cache)
+.PHONY: clear_cache
 
 test_challenge:
 	$(call clear_cache)
@@ -61,6 +71,7 @@ test_challenge:
 	# block 13284469.
 	mipsevm/mipsevm && mipsevm/mipsevm 13284469
 	npx hardhat test test/challenge_test.js
+.PHONY: test_challenge
 
 test_mipsevm:
 	$(call clear_cache)
@@ -68,6 +79,7 @@ test_mipsevm:
 	minigeth/go-ethereum 13284469
 	minigeth/go-ethereum 13284491
 	cd mipsevm && go test -v
+.PHONY: test_mipsevm
 
 test_minigeth:
 	$(call clear_cache)
@@ -80,12 +92,15 @@ test_minigeth:
 	minigeth/go-ethereum 13284053
 	# run block 13303075 (uncles)
 	minigeth/go-ethereum 13303075
+.PHONY: test_minigeth
 
 test_contracts:
 	$(call clear_cache)
 	npx hardhat test
+.PHONY: test_contracts
 
 test: test_challenge test_mipsevm test_minigeth
+.PHONY: test
 
 clean:
 	rm -f minigeth/go-ethereum
@@ -93,12 +108,10 @@ clean:
 	rm -f mipigo/minigeth.bin
 	rm -f mipsevm/mipsevm
 	rm -rf artifacts
+.PHONY: clean
 
 mrproper: clean
 	rm -rf cache
 	rm -rf node_modules
 	rm -rf mipigo/venv
-
-.PHONY: build unicorn submodules minigeth_mips minigeth_default_arch mipsevm contracts \
-	nodejs clean mrproper test_challenge test_mipsevm test_minigeth test
-	clear_cache unicorn_rebuild
+.PHONY:  mrproper