replace steps directory with stamp files in source/build dirs

this makes it easy to rebuild components simply by removing the source
or build directory with rm -rf; no separate action on the steps files
is needed.

some dependencies are also changed to order-only so that
update/rebuild of one component does not force unnecessary rebuild of
another.

new convenience pseudo-targets are also added.

Makefile

@@ -34,18 +34,38 @@ MUSL_CONFIG = CC="$(GCC0_CC)" --prefix=
 -include config.mak
 
 
-all: steps/install_binutils steps/install_musl steps/install_gcc
+all: install_binutils install_musl install_gcc
 
 clean:
 	rm -rf gcc-$(GCC_VER) binutils-$(BINUTILS_VER) musl
-	rm -rf steps/extract_* steps/clone_*
-	rm -rf steps/configure_* steps/build_* steps/install_*
 
 distclean: clean
 	rm -rf sources/config.sub sources/*.tar.bz2
 
-steps/configure_gcc0: steps/install_binutils
+.PHONY: extract_binutils extract_gcc clone_musl
-steps/configure_gcc: steps/install_musl
+.PHONY: configure_binutils configure_gcc0 configure_gcc configure_musl
+.PHONY: build_binutils build_gcc0 build_gcc build_musl
+.PHONY: install_binutils install_gcc install_musl
+
+extract_binutils: binutils-$(BINUTILS_VER)/.mcm_extracted
+extract_gcc: gcc-$(GCC_VER)/.mcm_extracted
+clone_musl: musl/.mcm_cloned
+
+configure_binutils: binutils-$(BINUTILS_VER)/.mcm_configured
+configure_gcc0: gcc-$(GCC_VER)/build0/.mcm_configured
+configure_gcc: gcc-$(GCC_VER)/build/.mcm_configured
+configure_musl: musl/.mcm_configured
+
+build_binutils: binutils-$(BINUTILS_VER)/.mcm_built
+build_gcc0: gcc-$(GCC_VER)/build0/.mcm_built
+build_gcc: gcc-$(GCC_VER)/build/.mcm_built
+build_musl: musl/.mcm_built
+
+install_binutils: binutils-$(BINUTILS_VER)/.mcm_installed
+install_gcc: gcc-$(GCC_VER)/build/.mcm_installed
+install_musl: musl/.mcm_installed
+
+
 
 
 sources/config.sub:
@@ -61,52 +81,52 @@ sources/gcc-%:
 
 
 
-steps/extract_binutils: sources/binutils-$(BINUTILS_VER).tar.bz2 sources/config.sub
+binutils-$(BINUTILS_VER)/.mcm_extracted: sources/binutils-$(BINUTILS_VER).tar.bz2 sources/config.sub
 	tar jxvf $<
 	cat patches/binutils-$(BINUTILS_VER)/* | ( cd binutils-$(BINUTILS_VER) && patch -p1 )
 	cp sources/config.sub binutils-$(BINUTILS_VER)
 	touch $@
 
-steps/configure_binutils: steps/extract_binutils
+binutils-$(BINUTILS_VER)/.mcm_configured: binutils-$(BINUTILS_VER)/.mcm_extracted
 	test -e binutils-$(BINUTILS_VER)/config.status || ( cd binutils-$(BINUTILS_VER) && ./configure $(BINUTILS_CONFIG) )
 	touch $@
 
-steps/build_binutils: steps/configure_binutils
+binutils-$(BINUTILS_VER)/.mcm_built: binutils-$(BINUTILS_VER)/.mcm_configured
 	cd binutils-$(BINUTILS_VER) && $(MAKE)
 	touch $@
 
-steps/install_binutils: steps/build_binutils
+binutils-$(BINUTILS_VER)/.mcm_installed: binutils-$(BINUTILS_VER)/.mcm_built
 	cd binutils-$(BINUTILS_VER) && $(MAKE) install
 	touch $@
 
 
 
 
-steps/extract_gcc: sources/gcc-$(GCC_VER).tar.bz2 sources/config.sub
+gcc-$(GCC_VER)/.mcm_extracted: sources/gcc-$(GCC_VER).tar.bz2 sources/config.sub
 	tar jxvf $<
 	cat patches/gcc-$(GCC_VER)/* | ( cd gcc-$(GCC_VER) && patch -p1 )
 	cp sources/config.sub gcc-$(GCC_VER)
 	touch $@
 
-steps/configure_gcc0: steps/extract_gcc
+gcc-$(GCC_VER)/build0/.mcm_configured: gcc-$(GCC_VER)/.mcm_extracted | binutils-$(BINUTILS_VER)/.mcm_installed
 	mkdir -p gcc-$(GCC_VER)/build0
 	test -e gcc-$(GCC_VER)/build0/config.status || ( cd gcc-$(GCC_VER)/build0 && $(GCC0_VARS) ../configure $(GCC0_CONFIG) )
 	touch $@
 
-steps/build_gcc0: steps/configure_gcc0
+gcc-$(GCC_VER)/build0/.mcm_built: gcc-$(GCC_VER)/build0/.mcm_configured
 	cd gcc-$(GCC_VER)/build0 && $(MAKE)
 	touch $@
 
-steps/configure_gcc: steps/extract_gcc
+gcc-$(GCC_VER)/build/.mcm_configured:  gcc-$(GCC_VER)/.mcm_extracted | binutils-$(BINUTILS_VER)/.mcm_installed musl/.mcm_installed
 	mkdir -p gcc-$(GCC_VER)/build
 	test -e gcc-$(GCC_VER)/build/config.status || ( cd gcc-$(GCC_VER)/build && ../configure $(GCC_CONFIG) )
 	touch $@
 
-steps/build_gcc: steps/configure_gcc
+gcc-$(GCC_VER)/build/.mcm_built: gcc-$(GCC_VER)/build/.mcm_configured
 	cd gcc-$(GCC_VER)/build && $(MAKE)
 	touch $@
 
-steps/install_gcc: steps/build_gcc
+gcc-$(GCC_VER)/build/.mcm_installed: gcc-$(GCC_VER)/build/.mcm_built
 	cd gcc-$(GCC_VER)/build && $(MAKE) install
 	touch $@
 
@@ -114,20 +134,20 @@ steps/install_gcc: steps/build_gcc
 
 
 
-steps/clone_musl:
+musl/.mcm_cloned:
 	test -d musl || git clone -b $(MUSL_TAG) git://git.musl-libc.org/musl musl
 	touch $@
 
-steps/configure_musl: steps/clone_musl steps/build_gcc0
+musl/.mcm_configured: musl/.mcm_cloned gcc-$(GCC_VER)/build0/.mcm_built
 	cd musl && ./configure $(MUSL_CONFIG)
 	cat patches/musl-complex-hack >> musl/config.mak
 	touch $@
 
-steps/build_musl: steps/configure_musl
+musl/.mcm_built: musl/.mcm_configured
 	cd musl && $(MAKE)
 	touch $@
 
-steps/install_musl: steps/build_musl
+musl/.mcm_installed: musl/.mcm_built
 	cd musl && $(MAKE) install DESTDIR=$(OUTPUT)/$(TARGET)
 	ln -sfn . $(OUTPUT)/$(TARGET)/usr
 	touch $@