make/devkit/Tools.gmk - platform/libcore - Git at Google

 #
 # Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License version 2 only, as
 # published by the Free Software Foundation.  Oracle designates this
 # particular file as subject to the "Classpath" exception as provided
 # by Oracle in the LICENSE file that accompanied this code.
 #
 # This code is distributed in the hope that it will be useful, but WITHOUT
 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 # FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 # version 2 for more details (a copy is included in the LICENSE file that
 # accompanied this code).
 #
 # You should have received a copy of the GNU General Public License version
 # 2 along with this work; if not, write to the Free Software Foundation,
 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 #
 # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 # or visit www.oracle.com if you need additional information or have any
 # questions.
 #

 ##########################################################################################
 #
 # Workhorse makefile for creating ONE cross compiler
 # Needs either to be from BUILD -> BUILD OR have
 # BUILD -> HOST prebuilt
 #
 # NOTE: There is a bug here. We don't limit the
 # PATH when building BUILD -> BUILD, which means that
 # if you configure after you've once build the BUILD->BUILD
 # compiler THAT one will be picked up as the compiler for itself.
 # This is not so great, especially if you did a partial delete
 # of the target tree.
 #
 # Fix this...
 #

 $(info TARGET=$(TARGET))
 $(info HOST=$(HOST))
 $(info BUILD=$(BUILD))

 ARCH := $(word 1,$(subst -, ,$(TARGET)))

 ifeq ($(TARGET), arm-linux-gnueabihf)
   ARCH=armhfp
 endif

 $(info ARCH=$(ARCH))

 ifeq ($(BASE_OS), OEL6)
   BASE_URL := http://yum.oracle.com/repo/OracleLinux/OL6/4/base/$(ARCH)/
   LINUX_VERSION := OEL6.4
 else ifeq ($(BASE_OS), Fedora)
   DEFAULT_OS_VERSION := 27
   ifeq ($(BASE_OS_VERSION), )
     BASE_OS_VERSION := $(DEFAULT_OS_VERSION)
   endif
   ifeq ($(filter x86_64 armhfp, $(ARCH)), )
     FEDORA_TYPE := fedora-secondary
   else
     FEDORA_TYPE := fedora/linux
   endif
   ARCHIVED := $(shell [ $(BASE_OS_VERSION) -lt $(DEFAULT_OS_VERSION) ] && echo true)
   ifeq ($(ARCHIVED),true)
     BASE_URL := https://archives.fedoraproject.org/pub/archive/$(FEDORA_TYPE)/releases/$(BASE_OS_VERSION)/Everything/$(ARCH)/os/Packages/
   else
     BASE_URL := https://dl.fedoraproject.org/pub/$(FEDORA_TYPE)/releases/$(BASE_OS_VERSION)/Everything/$(ARCH)/os/Packages/
   endif
   LINUX_VERSION := Fedora_$(BASE_OS_VERSION)
 else
   $(error Unknown base OS $(BASE_OS))
 endif

 ##########################################################################################
 # Define external dependencies

 # Latest that could be made to work.
 GCC_VER := 7.3.0
 ifeq ($(GCC_VER), 7.3.0)
   gcc_ver := gcc-7.3.0
   binutils_ver := binutils-2.30
   ccache_ver := ccache-3.3.6
   mpfr_ver := mpfr-3.1.5
   gmp_ver := gmp-6.1.2
   mpc_ver := mpc-1.0.3
   gdb_ver := gdb-8.1
 else ifeq ($(GCC_VER), 4.9.2)
   gcc_ver := gcc-4.9.2
   binutils_ver := binutils-2.25
   ccache_ver := ccache-3.2.1
   mpfr_ver := mpfr-3.0.1
   gmp_ver := gmp-4.3.2
   mpc_ver := mpc-1.0.1
   gdb_ver := gdb-7.12.1
 else
   $(error Unsupported GCC version)
 endif

 GCC := http://ftp.gnu.org/pub/gnu/gcc/$(gcc_ver)/$(gcc_ver).tar.xz
 BINUTILS := http://ftp.gnu.org/pub/gnu/binutils/$(binutils_ver).tar.xz
 CCACHE := https://samba.org/ftp/ccache/$(ccache_ver).tar.xz
 MPFR := http://www.mpfr.org/${mpfr_ver}/${mpfr_ver}.tar.bz2
 GMP := http://ftp.gnu.org/pub/gnu/gmp/${gmp_ver}.tar.bz2
 MPC := http://ftp.gnu.org/pub/gnu/mpc/${mpc_ver}.tar.gz
 GDB := http://ftp.gnu.org/gnu/gdb/${gdb_ver}.tar.xz

 # RPMs used by all BASE_OS
 RPM_LIST := \
     kernel-headers \
     glibc glibc-headers glibc-devel \
     cups-libs cups-devel \
     libX11 libX11-devel \
     xorg-x11-proto-devel \
     alsa-lib alsa-lib-devel \
     libXext libXext-devel \
     libXtst libXtst-devel \
     libXrender libXrender-devel \
     libXrandr libXrandr-devel \
     freetype freetype-devel \
     libXt libXt-devel \
     libSM libSM-devel \
     libICE libICE-devel \
     libXi libXi-devel \
     libXdmcp libXdmcp-devel \
     libXau libXau-devel \
     libgcc \
     zlib zlib-devel \
     libffi libffi-devel \
     fontconfig fontconfig-devel \
     systemtap-sdt-devel \
     #

 ##########################################################################################
 # Define common directories and files

 # Ensure we have 32-bit libs also for x64. We enable mixed-mode.
 ifeq (x86_64,$(ARCH))
   LIBDIRS := lib64 lib
   CFLAGS_lib := -m32
 else
   LIBDIRS := lib
 endif

 # Define directories
 BUILDDIR := $(OUTPUT_ROOT)/$(HOST)/$(TARGET)
 TARGETDIR := $(PREFIX)/$(TARGET)
 SYSROOT := $(TARGETDIR)/sysroot
 DOWNLOAD := $(OUTPUT_ROOT)/download
 DOWNLOAD_RPMS := $(DOWNLOAD)/rpms/$(TARGET)-$(LINUX_VERSION)
 SRCDIR := $(OUTPUT_ROOT)/src

 # Marker file for unpacking rpms
 rpms := $(SYSROOT)/rpms_unpacked

 # Need to patch libs that are linker scripts to use non-absolute paths
 libs := $(SYSROOT)/libs_patched

 ################################################################################
 # Download RPMs
 download-rpms:
 	mkdir -p $(DOWNLOAD_RPMS)
         # Only run this if rpm dir is empty.
         ifeq ($(wildcard $(DOWNLOAD_RPMS)/*.rpm), )
 	  cd $(DOWNLOAD_RPMS) && \
 	      wget -r -np -nd $(patsubst %, -A "*%*.rpm", $(RPM_LIST)) $(BASE_URL)
         endif

 ##########################################################################################
 # Unpack source packages

 # Generate downloading + unpacking of sources.
 define Download
   $(1)_DIR = $(abspath $(SRCDIR)/$(basename $(basename $(notdir $($(1))))))
   $(1)_CFG = $$($(1)_DIR)/configure
   $(1)_FILE = $(DOWNLOAD)/$(notdir $($(1)))

   $$($(1)_CFG) : $$($(1)_FILE)
 	mkdir -p $$(SRCDIR)
 	tar -C $$(SRCDIR) -xf $$<
 	$$(foreach p,$$(abspath $$(wildcard $$(notdir $$($(1)_DIR)).patch)), \
 	  echo PATCHING $$(p) ; \
 	  patch -d $$($(1)_DIR) -p1 -i $$(p) ; \
 	)
 	touch $$@

   $$($(1)_FILE) :
 	wget -P $(DOWNLOAD) $$($(1))
 endef

 # Download and unpack all source packages
 $(foreach p,GCC BINUTILS CCACHE MPFR GMP MPC GDB,$(eval $(call Download,$(p))))

 ##########################################################################################
 # Unpack RPMS

 RPM_ARCHS := $(ARCH) noarch
 ifeq ($(ARCH),x86_64)
   ifeq ($(BUILD),$(HOST))
     ifeq ($(TARGET),$(HOST))
       # When building the native compiler for x86_64, enable mixed mode.
       RPM_ARCHS += i386 i686
     endif
   endif
 else ifeq ($(ARCH),i686)
   RPM_ARCHS += i386
 else ifeq ($(ARCH), armhfp)
   RPM_ARCHS += armv7hl
 endif

 RPM_FILE_LIST := $(sort $(foreach a, $(RPM_ARCHS), \
   $(wildcard $(patsubst %,$(DOWNLOAD_RPMS)/%*$a.rpm,$(RPM_LIST))) \
 ))

 # Note. For building linux you should install rpm2cpio.
 define unrpm
   $(SYSROOT)/$(notdir $(1)).unpacked : $(1)
   $$(rpms) : $(SYSROOT)/$(notdir $(1)).unpacked
 endef

 %.unpacked :
 	$(info Unpacking target rpms and libraries from $<)
 	@(mkdir -p $(@D); \
 	cd $(@D); \
 	rpm2cpio $< | \
 	    cpio --extract --make-directories \
 	        -f \
 	        "./usr/share/doc/*" \
 	        "./usr/share/man/*" \
 	        "./usr/X11R6/man/*" \
 	        "*/X11/locale/*" \
 	    || die ; )
 	touch $@

 $(foreach p,$(RPM_FILE_LIST),$(eval $(call unrpm,$(p))))

 ##########################################################################################

 # Note: MUST create a <sysroot>/usr/lib even if not really needed.
 # gcc will use a path relative to it to resolve lib64. (x86_64).
 # we're creating multi-lib compiler with 32bit libc as well, so we should
 # have it anyway, but just to make sure...
 # Patch libc.so and libpthread.so to force linking against libraries in sysroot
 # and not the ones installed on the build machine.
 $(libs) : $(rpms)
 	@echo Patching libc and pthreads
 	@(for f in `find $(SYSROOT) -name libc.so -o -name libpthread.so`; do \
 	  (cat $$f | sed -e 's|/usr/lib64/||g' \
 	      -e 's|/usr/lib/||g' \
 	      -e 's|/lib64/||g' \
 	      -e 's|/lib/||g' ) > $$f.tmp ; \
 	  mv $$f.tmp $$f ; \
 	done)
 	@mkdir -p $(SYSROOT)/usr/lib
 	@touch $@

 ##########################################################################################
 # Create links for ffi header files so that they become visible by default when using the
 # devkit.
 ifeq ($(ARCH), x86_64)
   $(SYSROOT)/usr/include/ffi.h: $(rpms)
 	cd $(@D) && rm -f $(@F) && ln -s ../lib/libffi-*/include/$(@F) .

   $(SYSROOT)/usr/include/ffitarget.h: $(rpms)
 	cd $(@D) && rm -f $(@F) && ln -s ../lib/libffi-*/include/$(@F) .

   SYSROOT_LINKS += $(SYSROOT)/usr/include/ffi.h $(SYSROOT)/usr/include/ffitarget.h
 endif

 ##########################################################################################

 # Define marker files for each source package to be compiled
 $(foreach t,binutils mpfr gmp mpc gcc ccache gdb,$(eval $(t) = $(TARGETDIR)/$($(t)_ver).done))

 ##########################################################################################

 # Default base config
 CONFIG = --target=$(TARGET) \
     --host=$(HOST) --build=$(BUILD) \
     --prefix=$(PREFIX)

 PATHEXT = $(PREFIX)/bin:

 PATHPRE = PATH=$(PATHEXT)$(PATH)
 NUM_CORES := $(shell cat /proc/cpuinfo | grep -c processor)
 BUILDPAR = -j$(NUM_CORES)

 # Default commands to when making
 MAKECMD =
 INSTALLCMD = install


 declare_tools = CC$(1)=$(2)gcc LD$(1)=$(2)ld AR$(1)=$(2)ar AS$(1)=$(2)as RANLIB$(1)=$(2)ranlib CXX$(1)=$(2)g++ OBJDUMP$(1)=$(2)objdump

 ifeq ($(HOST),$(BUILD))
   ifeq ($(HOST),$(TARGET))
     TOOLS = $(call declare_tools,_FOR_TARGET,)
   endif
 endif

 TOOLS ?= $(call declare_tools,_FOR_TARGET,$(TARGET)-)

 ##########################################################################################

 # Create a TARGET bfd + libiberty only.
 # Configure one or two times depending on mulitlib arch.
 # If multilib, the second should be 32-bit, and we resolve
 # CFLAG_<name> to most likely -m32.
 define mk_bfd
   $$(info Libs for $(1))
   $$(BUILDDIR)/$$(binutils_ver)-$(subst /,-,$(1))/Makefile \
       : CFLAGS += $$(CFLAGS_$(1))
   $$(BUILDDIR)/$$(binutils_ver)-$(subst /,-,$(1))/Makefile \
       : LIBDIRS = --libdir=$(TARGETDIR)/$(1)

   bfdlib += $$(TARGETDIR)/$$(binutils_ver)-$(subst /,-,$(1)).done
   bfdmakes += $$(BUILDDIR)/$$(binutils_ver)-$(subst /,-,$(1))/Makefile
 endef

 # Create one set of bfds etc for each multilib arch
 $(foreach l,$(LIBDIRS),$(eval $(call mk_bfd,$(l))))

 # Only build these two libs.
 $(bfdlib) : MAKECMD = all-libiberty all-bfd
 $(bfdlib) : INSTALLCMD = install-libiberty install-bfd

 # Building targets libbfd + libiberty. HOST==TARGET, i.e not
 # for a cross env.
 $(bfdmakes) : CONFIG = --target=$(TARGET) \
     --host=$(TARGET) --build=$(BUILD) \
     --prefix=$(TARGETDIR) \
     --with-sysroot=$(SYSROOT) \
     $(LIBDIRS)

 $(bfdmakes) : TOOLS = $(call declare_tools,_FOR_TARGET,$(TARGET)-) $(call declare_tools,,$(TARGET)-)

 ##########################################################################################

 $(gcc) \
     $(binutils) \
     $(gmp) \
     $(mpfr) \
     $(mpc) \
     $(bfdmakes) \
     $(ccache) : ENVS += $(TOOLS)

 # libdir to work around hateful bfd stuff installing into wrong dirs...
 # ensure we have 64 bit bfd support in the HOST library. I.e our
 # compiler on i686 will know 64 bit symbols, BUT later
 # we build just the libs again for TARGET, then with whatever the arch
 # wants.
 $(BUILDDIR)/$(binutils_ver)/Makefile : CONFIG += --enable-64-bit-bfd --libdir=$(PREFIX)/$(word 1,$(LIBDIRS))

 # Makefile creation. Simply run configure in build dir.
 $(bfdmakes) \
 $(BUILDDIR)/$(binutils_ver)/Makefile \
     : $(BINUTILS_CFG)
 	$(info Configuring $@. Log in $(@D)/log.config)
 	@mkdir -p $(@D)
 	( \
 	  cd $(@D) ; \
 	  $(PATHPRE) $(ENVS) CFLAGS="$(CFLAGS)" \
 	      $(BINUTILS_CFG) \
 	      $(CONFIG) \
 	      --with-sysroot=$(SYSROOT) \
 	      --disable-nls \
 	      --program-prefix=$(TARGET)- \
 	      --enable-multilib \
 	      --enable-gold \
 	      --enable-plugins \
 	) > $(@D)/log.config 2>&1
 	@echo 'done'

 $(BUILDDIR)/$(mpfr_ver)/Makefile \
     : $(MPFR_CFG)
 	$(info Configuring $@. Log in $(@D)/log.config)
 	@mkdir -p $(@D)
 	( \
 	  cd $(@D) ; \
 	  $(PATHPRE) $(ENVS) CFLAGS="$(CFLAGS)" \
 	      $(MPFR_CFG) \
 	      $(CONFIG) \
 	      --program-prefix=$(TARGET)- \
 	      --enable-shared=no \
 	      --with-gmp=$(PREFIX) \
 	) > $(@D)/log.config 2>&1
 	@echo 'done'

 $(BUILDDIR)/$(gmp_ver)/Makefile \
     : $(GMP_CFG)
 	$(info Configuring $@. Log in $(@D)/log.config)
 	@mkdir -p $(@D)
 	( \
 	  cd $(@D) ; \
 	  $(PATHPRE) $(ENVS) CFLAGS="$(CFLAGS)" \
 	      $(GMP_CFG) \
 	      --host=$(HOST) --build=$(BUILD) \
 	      --prefix=$(PREFIX) \
 	      --disable-nls \
 	      --program-prefix=$(TARGET)- \
 	      --enable-shared=no \
 	      --with-mpfr=$(PREFIX) \
 	) > $(@D)/log.config 2>&1
 	@echo 'done'

 $(BUILDDIR)/$(mpc_ver)/Makefile \
     : $(MPC_CFG)
 	$(info Configuring $@. Log in $(@D)/log.config)
 	@mkdir -p $(@D)
 	( \
 	  cd $(@D) ; \
 	  $(PATHPRE) $(ENVS) CFLAGS="$(CFLAGS)" \
 	      $(MPC_CFG) \
 	      $(CONFIG) \
 	      --program-prefix=$(TARGET)- \
 	      --enable-shared=no \
 	      --with-mpfr=$(PREFIX) \
 	      --with-gmp=$(PREFIX) \
 	) > $(@D)/log.config 2>&1
 	@echo 'done'

 # Only valid if glibc target -> linux
 # proper destructor handling for c++
 ifneq (,$(findstring linux,$(TARGET)))
   $(BUILDDIR)/$(gcc_ver)/Makefile : CONFIG += --enable-__cxa_atexit
 endif

 ifeq ($(ARCH), armhfp)
   $(BUILDDIR)/$(gcc_ver)/Makefile : CONFIG +=  --with-float=hard
 endif

 ifneq ($(filter ppc64 ppc64le s390x, $(ARCH)), )
   # We only support 64-bit on these platforms anyway
   CONFIG += --disable-multilib
 endif

 # Want:
 # c,c++
 # shared libs
 # multilib (-m32/-m64 on x64)
 # skip native language.
 # and link and assemble with the binutils we created
 # earlier, so --with-gnu*
 $(BUILDDIR)/$(gcc_ver)/Makefile \
     : $(GCC_CFG)
 	$(info Configuring $@. Log in $(@D)/log.config)
 	mkdir -p $(@D)
 	( \
 	  cd $(@D) ; \
 	  $(PATHPRE) $(ENVS) $(GCC_CFG) $(EXTRA_CFLAGS) \
 	      $(CONFIG) \
 	      --with-sysroot=$(SYSROOT) \
 	      --enable-languages=c,c++ \
 	      --enable-shared \
 	      --disable-nls \
 	      --with-gnu-as \
 	      --with-gnu-ld \
 	      --with-mpfr=$(PREFIX) \
 	      --with-gmp=$(PREFIX) \
 	      --with-mpc=$(PREFIX) \
 	) > $(@D)/log.config 2>&1
 	@echo 'done'

 # need binutils for gcc
 $(gcc) : $(binutils)

 # as of 4.3 or so need these for doing config
 $(BUILDDIR)/$(gcc_ver)/Makefile : $(gmp) $(mpfr) $(mpc)
 $(mpfr) : $(gmp)
 $(mpc) : $(gmp) $(mpfr)

 ################################################################################
 # Build gdb but only where host and target match
 ifeq ($(HOST), $(TARGET))
   $(BUILDDIR)/$(gdb_ver)/Makefile: $(GDB_CFG)
 	$(info Configuring $@. Log in $(@D)/log.config)
 	mkdir -p $(@D)
 	( \
 	  cd $(@D) ; \
 	  $(PATHPRE) $(ENVS) CFLAGS="$(CFLAGS)" $(GDB_CFG) \
 	      $(CONFIG) \
 	      --with-sysroot=$(SYSROOT) \
 	) > $(@D)/log.config 2>&1
 	@echo 'done'

   $(gdb): $(gcc)
 else
   $(BUILDDIR)/$(gdb_ver)/Makefile:
 	$(info Faking $@, not used when cross-compiling)
 	mkdir -p $(@D)
 	echo "install:" > $@
 	@echo 'done'
 endif

 ##########################################################################################
 # very straightforward. just build a ccache. it is only for host.
 $(BUILDDIR)/$(ccache_ver)/Makefile \
     : $(CCACHE_CFG)
 	$(info Configuring $@. Log in $(@D)/log.config)
 	@mkdir -p $(@D)
 	@( \
 	  cd $(@D) ; \
 	  $(PATHPRE) $(ENVS) $(CCACHE_CFG) \
 	      $(CONFIG) \
 	) > $(@D)/log.config 2>&1
 	@echo 'done'

 gccpatch = $(TARGETDIR)/gcc-patched

 ##########################################################################################
 # For some reason cpp is not created as a target-compiler
 ifeq ($(HOST),$(TARGET))
   $(gccpatch) : $(gcc) link_libs
 	@echo -n 'Creating compiler symlinks...'
 	@for f in cpp; do \
 	  if [ ! -e $(PREFIX)/bin/$(TARGET)-$$f ]; \
 	  then \
 	    cd $(PREFIX)/bin && \
 	    ln -fs $$f $(TARGET)-$$f ; \
 	  fi \
 	done
 	@touch $@
 	@echo 'done'

   ##########################################################################################
   # Ugly at best. Seems that when we compile host->host compiler, that are NOT
   # the BUILD compiler, the result will not try searching for libs in package root.
   # "Solve" this by create links from the target libdirs to where they are.
   link_libs:
 	@echo -n 'Creating library symlinks...'
 	@$(foreach l,$(LIBDIRS), \
 	for f in `cd $(PREFIX)/$(l) && ls`; do \
 	  if [ ! -e $(TARGETDIR)/$(l)/$$f ]; then \
 	    mkdir -p $(TARGETDIR)/$(l) && \
 	    cd $(TARGETDIR)/$(l)/ && \
 	    ln -fs $(if $(findstring /,$(l)),../,)../../$(l)/$$f $$f; \
 	  fi \
 	done;)
 	@echo 'done'
 else
   $(gccpatch) :
 	@echo 'done'
 endif

 ##########################################################################################
 # Build in two steps.
 # make <default>
 # make install.
 # Use path to our build hosts cross tools
 # Always need to build cross tools for build host self.
 $(TARGETDIR)/%.done : $(BUILDDIR)/%/Makefile
 	$(info Building $(basename $@). Log in $(<D)/log.build)
 	$(PATHPRE) $(ENVS) $(MAKE) $(BUILDPAR) -f $< -C $(<D) $(MAKECMD) $(MAKECMD.$(notdir $@)) > $(<D)/log.build 2>&1
 	@echo -n 'installing...'
 	$(PATHPRE) $(MAKE) $(INSTALLPAR) -f $< -C $(<D) $(INSTALLCMD) $(MAKECMD.$(notdir $@)) > $(<D)/log.install 2>&1
 	@mkdir -p $(@D)
 	@touch $@
 	@echo 'done'

 ##########################################################################################

 $(PREFIX)/devkit.info:
 	@echo 'Creating devkit.info in the root of the kit'
 	rm -f $@
 	touch $@
 	echo '# This file describes to configure how to interpret the contents of this' >> $@
 	echo '# devkit' >> $@
 	echo '' >> $@
 	echo 'DEVKIT_NAME="$(gcc_ver) - $(LINUX_VERSION)"' >> $@
 	echo 'DEVKIT_TOOLCHAIN_PATH="$$DEVKIT_ROOT/bin"' >> $@
 	echo 'DEVKIT_SYSROOT="$$DEVKIT_ROOT/$(TARGET)/sysroot"' >> $@
 	echo 'DEVKIT_EXTRA_PATH="$$DEVKIT_ROOT/bin"' >> $@

 ##########################################################################################
 # Copy these makefiles into the root of the kit
 $(PREFIX)/Makefile: ./Makefile
 	rm -rf $@
 	cp $< $@

 $(PREFIX)/Tools.gmk: ./Tools.gmk
 	rm -rf $@
 	cp $< $@

 THESE_MAKEFILES := $(PREFIX)/Makefile $(PREFIX)/Tools.gmk

 ##########################################################################################

 ifeq ($(TARGET), $(HOST))
   # To build with dtrace support, the build needs access to the dtrace executable from the
   # sysroot. Generally we don't want to add binaries in the sysroot to the path, but
   # luckily this seems to execute well enough on a different host Linux distro, so symlink
   # it into the main bin dir.
   $(PREFIX)/bin/dtrace:
 	@echo 'Creating dtrace soft link'
 	ln -s ../$(HOST)/sysroot/usr/bin/dtrace $@

   $(PREFIX)/bin/%:
 	@echo 'Creating missing $* soft link'
 	ln -s $(TARGET)-$* $@

   missing-links := $(addprefix $(PREFIX)/bin/, \
       addr2line ar as c++ c++filt dwp elfedit g++ gcc gcc-$(GCC_VER) gprof ld ld.bfd \
       ld.gold nm objcopy objdump ranlib readelf size strings strip)
 endif

 ##########################################################################################

 bfdlib : $(bfdlib)
 binutils : $(binutils)
 rpms : $(rpms)
 libs : $(libs)
 sysroot : rpms libs
 gcc : sysroot $(gcc) $(gccpatch)
 gdb : $(gdb)
 all : binutils gcc bfdlib $(PREFIX)/devkit.info $(missing-links) $(SYSROOT_LINKS) \
     $(THESE_MAKEFILES) gdb

 # this is only built for host. so separate.
 ccache : $(ccache)

 .PHONY : gcc all binutils bfdlib link_libs rpms libs sysroot
	#
	# Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
	# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	#
	# This code is free software; you can redistribute it and/or modify it
	# under the terms of the GNU General Public License version 2 only, as
	# published by the Free Software Foundation. Oracle designates this
	# particular file as subject to the "Classpath" exception as provided
	# by Oracle in the LICENSE file that accompanied this code.
	#
	# This code is distributed in the hope that it will be useful, but WITHOUT
	# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	# version 2 for more details (a copy is included in the LICENSE file that
	# accompanied this code).
	#
	# You should have received a copy of the GNU General Public License version
	# 2 along with this work; if not, write to the Free Software Foundation,
	# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	#
	# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	# or visit www.oracle.com if you need additional information or have any
	# questions.
	#

	##########################################################################################
	#
	# Workhorse makefile for creating ONE cross compiler
	# Needs either to be from BUILD -> BUILD OR have
	# BUILD -> HOST prebuilt
	#
	# NOTE: There is a bug here. We don't limit the
	# PATH when building BUILD -> BUILD, which means that
	# if you configure after you've once build the BUILD->BUILD
	# compiler THAT one will be picked up as the compiler for itself.
	# This is not so great, especially if you did a partial delete
	# of the target tree.
	#
	# Fix this...
	#

	$(info TARGET=$(TARGET))
	$(info HOST=$(HOST))
	$(info BUILD=$(BUILD))

	ARCH := $(word 1,$(subst -, ,$(TARGET)))

	ifeq ($(TARGET), arm-linux-gnueabihf)
	ARCH=armhfp
	endif

	$(info ARCH=$(ARCH))

	ifeq ($(BASE_OS), OEL6)
	BASE_URL := http://yum.oracle.com/repo/OracleLinux/OL6/4/base/$(ARCH)/
	LINUX_VERSION := OEL6.4
	else ifeq ($(BASE_OS), Fedora)
	DEFAULT_OS_VERSION := 27
	ifeq ($(BASE_OS_VERSION), )
	BASE_OS_VERSION := $(DEFAULT_OS_VERSION)
	endif
	ifeq ($(filter x86_64 armhfp, $(ARCH)), )
	FEDORA_TYPE := fedora-secondary
	else
	FEDORA_TYPE := fedora/linux
	endif
	ARCHIVED := $(shell [ $(BASE_OS_VERSION) -lt $(DEFAULT_OS_VERSION) ] && echo true)
	ifeq ($(ARCHIVED),true)
	BASE_URL := https://archives.fedoraproject.org/pub/archive/$(FEDORA_TYPE)/releases/$(BASE_OS_VERSION)/Everything/$(ARCH)/os/Packages/
	else
	BASE_URL := https://dl.fedoraproject.org/pub/$(FEDORA_TYPE)/releases/$(BASE_OS_VERSION)/Everything/$(ARCH)/os/Packages/
	endif
	LINUX_VERSION := Fedora_$(BASE_OS_VERSION)
	else
	$(error Unknown base OS $(BASE_OS))
	endif

	##########################################################################################
	# Define external dependencies

	# Latest that could be made to work.
	GCC_VER := 7.3.0
	ifeq ($(GCC_VER), 7.3.0)
	gcc_ver := gcc-7.3.0
	binutils_ver := binutils-2.30
	ccache_ver := ccache-3.3.6
	mpfr_ver := mpfr-3.1.5
	gmp_ver := gmp-6.1.2
	mpc_ver := mpc-1.0.3
	gdb_ver := gdb-8.1
	else ifeq ($(GCC_VER), 4.9.2)
	gcc_ver := gcc-4.9.2
	binutils_ver := binutils-2.25
	ccache_ver := ccache-3.2.1
	mpfr_ver := mpfr-3.0.1
	gmp_ver := gmp-4.3.2
	mpc_ver := mpc-1.0.1
	gdb_ver := gdb-7.12.1
	else
	$(error Unsupported GCC version)
	endif

	GCC := http://ftp.gnu.org/pub/gnu/gcc/$(gcc_ver)/$(gcc_ver).tar.xz
	BINUTILS := http://ftp.gnu.org/pub/gnu/binutils/$(binutils_ver).tar.xz
	CCACHE := https://samba.org/ftp/ccache/$(ccache_ver).tar.xz
	MPFR := http://www.mpfr.org/${mpfr_ver}/${mpfr_ver}.tar.bz2
	GMP := http://ftp.gnu.org/pub/gnu/gmp/${gmp_ver}.tar.bz2
	MPC := http://ftp.gnu.org/pub/gnu/mpc/${mpc_ver}.tar.gz
	GDB := http://ftp.gnu.org/gnu/gdb/${gdb_ver}.tar.xz

	# RPMs used by all BASE_OS
	RPM_LIST := \
	kernel-headers \
	glibc glibc-headers glibc-devel \
	cups-libs cups-devel \
	libX11 libX11-devel \
	xorg-x11-proto-devel \
	alsa-lib alsa-lib-devel \
	libXext libXext-devel \
	libXtst libXtst-devel \
	libXrender libXrender-devel \
	libXrandr libXrandr-devel \
	freetype freetype-devel \
	libXt libXt-devel \
	libSM libSM-devel \
	libICE libICE-devel \
	libXi libXi-devel \
	libXdmcp libXdmcp-devel \
	libXau libXau-devel \
	libgcc \
	zlib zlib-devel \
	libffi libffi-devel \
	fontconfig fontconfig-devel \
	systemtap-sdt-devel \
	#

	##########################################################################################
	# Define common directories and files

	# Ensure we have 32-bit libs also for x64. We enable mixed-mode.
	ifeq (x86_64,$(ARCH))
	LIBDIRS := lib64 lib
	CFLAGS_lib := -m32
	else
	LIBDIRS := lib
	endif

	# Define directories
	BUILDDIR := $(OUTPUT_ROOT)/$(HOST)/$(TARGET)
	TARGETDIR := $(PREFIX)/$(TARGET)
	SYSROOT := $(TARGETDIR)/sysroot
	DOWNLOAD := $(OUTPUT_ROOT)/download
	DOWNLOAD_RPMS := $(DOWNLOAD)/rpms/$(TARGET)-$(LINUX_VERSION)
	SRCDIR := $(OUTPUT_ROOT)/src

	# Marker file for unpacking rpms
	rpms := $(SYSROOT)/rpms_unpacked

	# Need to patch libs that are linker scripts to use non-absolute paths
	libs := $(SYSROOT)/libs_patched

	################################################################################
	# Download RPMs
	download-rpms:
	mkdir -p $(DOWNLOAD_RPMS)
	# Only run this if rpm dir is empty.
	ifeq ($(wildcard $(DOWNLOAD_RPMS)/*.rpm), )
	cd $(DOWNLOAD_RPMS) && \
	wget -r -np -nd $(patsubst %, -A "%.rpm", $(RPM_LIST)) $(BASE_URL)
	endif

	##########################################################################################
	# Unpack source packages

	# Generate downloading + unpacking of sources.
	define Download
	$(1)_DIR = $(abspath $(SRCDIR)/$(basename $(basename $(notdir $($(1))))))
	$(1)_CFG = $$($(1)_DIR)/configure
	$(1)_FILE = $(DOWNLOAD)/$(notdir $($(1)))

	$$($(1)_CFG) : $$($(1)_FILE)
	mkdir -p $$(SRCDIR)
	tar -C $$(SRCDIR) -xf $$<
	$$(foreach p,$$(abspath $$(wildcard $$(notdir $$($(1)_DIR)).patch)), \
	echo PATCHING $$(p) ; \
	patch -d $$($(1)_DIR) -p1 -i $$(p) ; \
	)
	touch $$@

	$$($(1)_FILE) :
	wget -P $(DOWNLOAD) $$($(1))
	endef

	# Download and unpack all source packages
	$(foreach p,GCC BINUTILS CCACHE MPFR GMP MPC GDB,$(eval $(call Download,$(p))))

	##########################################################################################
	# Unpack RPMS

	RPM_ARCHS := $(ARCH) noarch
	ifeq ($(ARCH),x86_64)
	ifeq ($(BUILD),$(HOST))
	ifeq ($(TARGET),$(HOST))
	# When building the native compiler for x86_64, enable mixed mode.
	RPM_ARCHS += i386 i686
	endif
	endif
	else ifeq ($(ARCH),i686)
	RPM_ARCHS += i386
	else ifeq ($(ARCH), armhfp)
	RPM_ARCHS += armv7hl
	endif

	RPM_FILE_LIST := $(sort $(foreach a, $(RPM_ARCHS), \
	$(wildcard $(patsubst %,$(DOWNLOAD_RPMS)/%*$a.rpm,$(RPM_LIST))) \
	))

	# Note. For building linux you should install rpm2cpio.
	define unrpm
	$(SYSROOT)/$(notdir $(1)).unpacked : $(1)
	$$(rpms) : $(SYSROOT)/$(notdir $(1)).unpacked
	endef

	%.unpacked :
	$(info Unpacking target rpms and libraries from $<)
	@(mkdir -p $(@D); \
	cd $(@D); \
	rpm2cpio $< \| \
	cpio --extract --make-directories \
	-f \
	"./usr/share/doc/*" \
	"./usr/share/man/*" \
	"./usr/X11R6/man/*" \
	"/X11/locale/" \
	\|\| die ; )
	touch $@

	$(foreach p,$(RPM_FILE_LIST),$(eval $(call unrpm,$(p))))

	##########################################################################################

	# Note: MUST create a <sysroot>/usr/lib even if not really needed.
	# gcc will use a path relative to it to resolve lib64. (x86_64).
	# we're creating multi-lib compiler with 32bit libc as well, so we should
	# have it anyway, but just to make sure...
	# Patch libc.so and libpthread.so to force linking against libraries in sysroot
	# and not the ones installed on the build machine.
	$(libs) : $(rpms)
	@echo Patching libc and pthreads
	@(for f in `find $(SYSROOT) -name libc.so -o -name libpthread.so`; do \
	(cat $$f \| sed -e 's\|/usr/lib64/\|\|g' \
	-e 's\|/usr/lib/\|\|g' \
	-e 's\|/lib64/\|\|g' \
	-e 's\|/lib/\|\|g' ) > $$f.tmp ; \
	mv $$f.tmp $$f ; \
	done)
	@mkdir -p $(SYSROOT)/usr/lib
	@touch $@

	##########################################################################################
	# Create links for ffi header files so that they become visible by default when using the
	# devkit.
	ifeq ($(ARCH), x86_64)
	$(SYSROOT)/usr/include/ffi.h: $(rpms)
	cd $(@D) && rm -f $(@F) && ln -s ../lib/libffi-*/include/$(@F) .

	$(SYSROOT)/usr/include/ffitarget.h: $(rpms)
	cd $(@D) && rm -f $(@F) && ln -s ../lib/libffi-*/include/$(@F) .

	SYSROOT_LINKS += $(SYSROOT)/usr/include/ffi.h $(SYSROOT)/usr/include/ffitarget.h
	endif

	##########################################################################################

	# Define marker files for each source package to be compiled
	$(foreach t,binutils mpfr gmp mpc gcc ccache gdb,$(eval $(t) = $(TARGETDIR)/$($(t)_ver).done))

	##########################################################################################

	# Default base config
	CONFIG = --target=$(TARGET) \
	--host=$(HOST) --build=$(BUILD) \
	--prefix=$(PREFIX)

	PATHEXT = $(PREFIX)/bin:

	PATHPRE = PATH=$(PATHEXT)$(PATH)
	NUM_CORES := $(shell cat /proc/cpuinfo \| grep -c processor)
	BUILDPAR = -j$(NUM_CORES)

	# Default commands to when making
	MAKECMD =
	INSTALLCMD = install


	declare_tools = CC$(1)=$(2)gcc LD$(1)=$(2)ld AR$(1)=$(2)ar AS$(1)=$(2)as RANLIB$(1)=$(2)ranlib CXX$(1)=$(2)g++ OBJDUMP$(1)=$(2)objdump

	ifeq ($(HOST),$(BUILD))
	ifeq ($(HOST),$(TARGET))
	TOOLS = $(call declare_tools,_FOR_TARGET,)
	endif
	endif

	TOOLS ?= $(call declare_tools,_FOR_TARGET,$(TARGET)-)

	##########################################################################################

	# Create a TARGET bfd + libiberty only.
	# Configure one or two times depending on mulitlib arch.
	# If multilib, the second should be 32-bit, and we resolve
	# CFLAG_<name> to most likely -m32.
	define mk_bfd
	$$(info Libs for $(1))
	$$(BUILDDIR)/$$(binutils_ver)-$(subst /,-,$(1))/Makefile \
	: CFLAGS += $$(CFLAGS_$(1))
	$$(BUILDDIR)/$$(binutils_ver)-$(subst /,-,$(1))/Makefile \
	: LIBDIRS = --libdir=$(TARGETDIR)/$(1)

	bfdlib += $$(TARGETDIR)/$$(binutils_ver)-$(subst /,-,$(1)).done
	bfdmakes += $$(BUILDDIR)/$$(binutils_ver)-$(subst /,-,$(1))/Makefile
	endef

	# Create one set of bfds etc for each multilib arch
	$(foreach l,$(LIBDIRS),$(eval $(call mk_bfd,$(l))))

	# Only build these two libs.
	$(bfdlib) : MAKECMD = all-libiberty all-bfd
	$(bfdlib) : INSTALLCMD = install-libiberty install-bfd

	# Building targets libbfd + libiberty. HOST==TARGET, i.e not
	# for a cross env.
	$(bfdmakes) : CONFIG = --target=$(TARGET) \
	--host=$(TARGET) --build=$(BUILD) \
	--prefix=$(TARGETDIR) \
	--with-sysroot=$(SYSROOT) \
	$(LIBDIRS)

	$(bfdmakes) : TOOLS = $(call declare_tools,_FOR_TARGET,$(TARGET)-) $(call declare_tools,,$(TARGET)-)

	##########################################################################################

	$(gcc) \
	$(binutils) \
	$(gmp) \
	$(mpfr) \
	$(mpc) \
	$(bfdmakes) \
	$(ccache) : ENVS += $(TOOLS)

	# libdir to work around hateful bfd stuff installing into wrong dirs...
	# ensure we have 64 bit bfd support in the HOST library. I.e our
	# compiler on i686 will know 64 bit symbols, BUT later
	# we build just the libs again for TARGET, then with whatever the arch
	# wants.
	$(BUILDDIR)/$(binutils_ver)/Makefile : CONFIG += --enable-64-bit-bfd --libdir=$(PREFIX)/$(word 1,$(LIBDIRS))

	# Makefile creation. Simply run configure in build dir.
	$(bfdmakes) \
	$(BUILDDIR)/$(binutils_ver)/Makefile \
	: $(BINUTILS_CFG)
	$(info Configuring $@. Log in $(@D)/log.config)
	@mkdir -p $(@D)
	( \
	cd $(@D) ; \
	$(PATHPRE) $(ENVS) CFLAGS="$(CFLAGS)" \
	$(BINUTILS_CFG) \
	$(CONFIG) \
	--with-sysroot=$(SYSROOT) \
	--disable-nls \
	--program-prefix=$(TARGET)- \
	--enable-multilib \
	--enable-gold \
	--enable-plugins \
	) > $(@D)/log.config 2>&1
	@echo 'done'

	$(BUILDDIR)/$(mpfr_ver)/Makefile \
	: $(MPFR_CFG)
	$(info Configuring $@. Log in $(@D)/log.config)
	@mkdir -p $(@D)
	( \
	cd $(@D) ; \
	$(PATHPRE) $(ENVS) CFLAGS="$(CFLAGS)" \
	$(MPFR_CFG) \
	$(CONFIG) \
	--program-prefix=$(TARGET)- \
	--enable-shared=no \
	--with-gmp=$(PREFIX) \
	) > $(@D)/log.config 2>&1
	@echo 'done'

	$(BUILDDIR)/$(gmp_ver)/Makefile \
	: $(GMP_CFG)
	$(info Configuring $@. Log in $(@D)/log.config)
	@mkdir -p $(@D)
	( \
	cd $(@D) ; \
	$(PATHPRE) $(ENVS) CFLAGS="$(CFLAGS)" \
	$(GMP_CFG) \
	--host=$(HOST) --build=$(BUILD) \
	--prefix=$(PREFIX) \
	--disable-nls \
	--program-prefix=$(TARGET)- \
	--enable-shared=no \
	--with-mpfr=$(PREFIX) \
	) > $(@D)/log.config 2>&1
	@echo 'done'

	$(BUILDDIR)/$(mpc_ver)/Makefile \
	: $(MPC_CFG)
	$(info Configuring $@. Log in $(@D)/log.config)
	@mkdir -p $(@D)
	( \
	cd $(@D) ; \
	$(PATHPRE) $(ENVS) CFLAGS="$(CFLAGS)" \
	$(MPC_CFG) \
	$(CONFIG) \
	--program-prefix=$(TARGET)- \
	--enable-shared=no \
	--with-mpfr=$(PREFIX) \
	--with-gmp=$(PREFIX) \
	) > $(@D)/log.config 2>&1
	@echo 'done'

	# Only valid if glibc target -> linux
	# proper destructor handling for c++
	ifneq (,$(findstring linux,$(TARGET)))
	$(BUILDDIR)/$(gcc_ver)/Makefile : CONFIG += --enable-__cxa_atexit
	endif

	ifeq ($(ARCH), armhfp)
	$(BUILDDIR)/$(gcc_ver)/Makefile : CONFIG += --with-float=hard
	endif

	ifneq ($(filter ppc64 ppc64le s390x, $(ARCH)), )
	# We only support 64-bit on these platforms anyway
	CONFIG += --disable-multilib
	endif

	# Want:
	# c,c++
	# shared libs
	# multilib (-m32/-m64 on x64)
	# skip native language.
	# and link and assemble with the binutils we created
	# earlier, so --with-gnu*
	$(BUILDDIR)/$(gcc_ver)/Makefile \
	: $(GCC_CFG)
	$(info Configuring $@. Log in $(@D)/log.config)
	mkdir -p $(@D)
	( \
	cd $(@D) ; \
	$(PATHPRE) $(ENVS) $(GCC_CFG) $(EXTRA_CFLAGS) \
	$(CONFIG) \
	--with-sysroot=$(SYSROOT) \
	--enable-languages=c,c++ \
	--enable-shared \
	--disable-nls \
	--with-gnu-as \
	--with-gnu-ld \
	--with-mpfr=$(PREFIX) \
	--with-gmp=$(PREFIX) \
	--with-mpc=$(PREFIX) \
	) > $(@D)/log.config 2>&1
	@echo 'done'

	# need binutils for gcc
	$(gcc) : $(binutils)

	# as of 4.3 or so need these for doing config
	$(BUILDDIR)/$(gcc_ver)/Makefile : $(gmp) $(mpfr) $(mpc)
	$(mpfr) : $(gmp)
	$(mpc) : $(gmp) $(mpfr)

	################################################################################
	# Build gdb but only where host and target match
	ifeq ($(HOST), $(TARGET))
	$(BUILDDIR)/$(gdb_ver)/Makefile: $(GDB_CFG)
	$(info Configuring $@. Log in $(@D)/log.config)
	mkdir -p $(@D)
	( \
	cd $(@D) ; \
	$(PATHPRE) $(ENVS) CFLAGS="$(CFLAGS)" $(GDB_CFG) \
	$(CONFIG) \
	--with-sysroot=$(SYSROOT) \
	) > $(@D)/log.config 2>&1
	@echo 'done'

	$(gdb): $(gcc)
	else
	$(BUILDDIR)/$(gdb_ver)/Makefile:
	$(info Faking $@, not used when cross-compiling)
	mkdir -p $(@D)
	echo "install:" > $@
	@echo 'done'
	endif

	##########################################################################################
	# very straightforward. just build a ccache. it is only for host.
	$(BUILDDIR)/$(ccache_ver)/Makefile \
	: $(CCACHE_CFG)
	$(info Configuring $@. Log in $(@D)/log.config)
	@mkdir -p $(@D)
	@( \
	cd $(@D) ; \
	$(PATHPRE) $(ENVS) $(CCACHE_CFG) \
	$(CONFIG) \
	) > $(@D)/log.config 2>&1
	@echo 'done'

	gccpatch = $(TARGETDIR)/gcc-patched

	##########################################################################################
	# For some reason cpp is not created as a target-compiler
	ifeq ($(HOST),$(TARGET))
	$(gccpatch) : $(gcc) link_libs
	@echo -n 'Creating compiler symlinks...'
	@for f in cpp; do \
	if [ ! -e $(PREFIX)/bin/$(TARGET)-$$f ]; \
	then \
	cd $(PREFIX)/bin && \
	ln -fs $$f $(TARGET)-$$f ; \
	fi \
	done
	@touch $@
	@echo 'done'

	##########################################################################################
	# Ugly at best. Seems that when we compile host->host compiler, that are NOT
	# the BUILD compiler, the result will not try searching for libs in package root.
	# "Solve" this by create links from the target libdirs to where they are.
	link_libs:
	@echo -n 'Creating library symlinks...'
	@$(foreach l,$(LIBDIRS), \
	for f in `cd $(PREFIX)/$(l) && ls`; do \
	if [ ! -e $(TARGETDIR)/$(l)/$$f ]; then \
	mkdir -p $(TARGETDIR)/$(l) && \
	cd $(TARGETDIR)/$(l)/ && \
	ln -fs $(if $(findstring /,$(l)),../,)../../$(l)/$$f $$f; \
	fi \
	done;)
	@echo 'done'
	else
	$(gccpatch) :
	@echo 'done'
	endif

	##########################################################################################
	# Build in two steps.
	# make <default>
	# make install.
	# Use path to our build hosts cross tools
	# Always need to build cross tools for build host self.
	$(TARGETDIR)/%.done : $(BUILDDIR)/%/Makefile
	$(info Building $(basename $@). Log in $(<D)/log.build)
	$(PATHPRE) $(ENVS) $(MAKE) $(BUILDPAR) -f $< -C $(<D) $(MAKECMD) $(MAKECMD.$(notdir $@)) > $(<D)/log.build 2>&1
	@echo -n 'installing...'
	$(PATHPRE) $(MAKE) $(INSTALLPAR) -f $< -C $(<D) $(INSTALLCMD) $(MAKECMD.$(notdir $@)) > $(<D)/log.install 2>&1
	@mkdir -p $(@D)
	@touch $@
	@echo 'done'

	##########################################################################################

	$(PREFIX)/devkit.info:
	@echo 'Creating devkit.info in the root of the kit'
	rm -f $@
	touch $@
	echo '# This file describes to configure how to interpret the contents of this' >> $@
	echo '# devkit' >> $@
	echo '' >> $@
	echo 'DEVKIT_NAME="$(gcc_ver) - $(LINUX_VERSION)"' >> $@
	echo 'DEVKIT_TOOLCHAIN_PATH="$$DEVKIT_ROOT/bin"' >> $@
	echo 'DEVKIT_SYSROOT="$$DEVKIT_ROOT/$(TARGET)/sysroot"' >> $@
	echo 'DEVKIT_EXTRA_PATH="$$DEVKIT_ROOT/bin"' >> $@

	##########################################################################################
	# Copy these makefiles into the root of the kit
	$(PREFIX)/Makefile: ./Makefile
	rm -rf $@
	cp $< $@

	$(PREFIX)/Tools.gmk: ./Tools.gmk
	rm -rf $@
	cp $< $@

	THESE_MAKEFILES := $(PREFIX)/Makefile $(PREFIX)/Tools.gmk

	##########################################################################################

	ifeq ($(TARGET), $(HOST))
	# To build with dtrace support, the build needs access to the dtrace executable from the
	# sysroot. Generally we don't want to add binaries in the sysroot to the path, but
	# luckily this seems to execute well enough on a different host Linux distro, so symlink
	# it into the main bin dir.
	$(PREFIX)/bin/dtrace:
	@echo 'Creating dtrace soft link'
	ln -s ../$(HOST)/sysroot/usr/bin/dtrace $@

	$(PREFIX)/bin/%:
	@echo 'Creating missing $* soft link'
	ln -s $(TARGET)-$* $@

	missing-links := $(addprefix $(PREFIX)/bin/, \
	addr2line ar as c++ c++filt dwp elfedit g++ gcc gcc-$(GCC_VER) gprof ld ld.bfd \
	ld.gold nm objcopy objdump ranlib readelf size strings strip)
	endif

	##########################################################################################

	bfdlib : $(bfdlib)
	binutils : $(binutils)
	rpms : $(rpms)
	libs : $(libs)
	sysroot : rpms libs
	gcc : sysroot $(gcc) $(gccpatch)
	gdb : $(gdb)
	all : binutils gcc bfdlib $(PREFIX)/devkit.info $(missing-links) $(SYSROOT_LINKS) \
	$(THESE_MAKEFILES) gdb

	# this is only built for host. so separate.
	ccache : $(ccache)

	.PHONY : gcc all binutils bfdlib link_libs rpms libs sysroot