#!/usr/bin/make -f
#
# \brief  Tool-chain creation tool for the Genode OS Framework
# \author Norman Feske
# \date   2009-02-03
#

help:
	$(ECHO)
	$(ECHO) "Build tool chain for the Genode OS Framework"
	$(ECHO)
	$(ECHO) "The tool chain consists of GCC $(GCC_VERSION) and binutils $(BINUTILS_VERSION)"
	$(ECHO) "and will be created at '$(LOCAL_INSTALL_LOCATION)'."
	$(ECHO)
	$(ECHO) "--- available commands ---"
	$(ECHO) "x86        - create tool chain for x86"
	$(ECHO) "arm        - create tool chain for arm"
	$(ECHO) "clean      - clean everything except downloaded archives"
	$(ECHO) "cleanall   - clean everything including downloaded archives"
	$(ECHO) "install    - copy tool chain to '$(INSTALL_LOCATION)'"
	$(ECHO)

#
# User interface
#

SUPPORTED_PLATFORMS := x86 microblaze arm

PLATFORM := $(firstword $(filter $(SUPPORTED_PLATFORMS),$(MAKECMDGOALS)))

$(SUPPORTED_PLATFORMS): install

#
# Enable parallel build for 2nd-level $(MAKE) by default
#

MAKE_OPT ?= -j4

#
# Determine Genode base directory based on the known location of the
# 'create_builddir' tool within the Genode source tree
#

GENODE_DIR ?= $(realpath $(dir $(MAKEFILE_LIST))/..)

#
# Download locations
#

DOWNLOAD_MIRROR      ?= ftp://ftp.fu-berlin.de
GCC_DOWNLOAD_URL      = $(DOWNLOAD_MIRROR)/gnu/gcc
BINUTILS_DOWNLOAD_URL = $(DOWNLOAD_MIRROR)/gnu/binutils
GDB_DOWNLOAD_URL      = $(DOWNLOAD_MIRROR)/gnu/gdb
GMP_DOWNLOAD_URL      = $(DOWNLOAD_MIRROR)/gnu/gmp
MPFR_DOWNLOAD_URL     = $(DOWNLOAD_MIRROR)/gnu/mpfr
MPC_DOWNLOAD_URL     ?= http://www.multiprecision.org/mpc/download


#
# Tool versions and install location
#

GCC_VERSION       = 4.6.1
BINUTILS_VERSION  = 2.21.1
GDB_VERSION       = 7.3.1
GMP_VERSION       = 5.0.2
MPFR_VERSION      = 3.1.0
MPC_VERSION       = 0.9
INSTALL_LOCATION  = /usr/local/genode-gcc
DOWNLOAD_DIR      = download
CONTRIB_DIR       = contrib

BINUTILS_DOWNLOAD_TBZ2 = binutils-$(BINUTILS_VERSION).tar.bz2

# download file name differs from dir name found within the archive
ifeq ($(BINUTILS_VERSION),2.21.1)
BINUTILS_DOWNLOAD_TBZ2 = binutils-$(BINUTILS_VERSION)a.tar.bz2
endif

#
# Utilities
#

SHELL       = bash
BRIGHT_COL  = \033[01;33m
DEFAULT_COL = \033[0m
ECHO        = @echo -e
VERBOSE     = @

AUTOCONF_gcc_4.4.5 = autoconf2.59
AUTOCONF_gcc_4.6.1 = autoconf2.64

AUTOCONF = $(AUTOCONF_gcc_$(GCC_VERSION))

ifeq ($(AUTOCONF),)
$(error Unknown autoconf version for GCC $(GCC_VERSION).)
endif

#
# Check if 'autoconf' is installed
#
ifeq ($(shell which $(AUTOCONF)),)
$(error Need to have '$(AUTOCONF)' installed.)
endif

#
# Check if 'libncurses' is installed
#
ifneq ($(shell $(LD) -lncurses -e0 -o /tmp/a.out && echo ok),ok)
$(error Need to have 'libncurses' installed.)
endif

#
# Check if 'texinfo' is installed
#
ifeq ($(shell which texi2pdf),)
$(error Need to have 'texinfo' installed.)
endif

#
# Check if 'wget' is installed
#
ifeq ($(shell which wget),)
$(error Need to have 'wget' installed.)
endif

#
# Check if 'autogen' is installed
#
ifeq ($(shell which autogen)),)
$(error Need to have 'autogen' installed.)
endif

#
# Libc stub
#

LIBC_GEN_SYMLINKS = \
	stdint.h memory.h string.h stdlib.h unistd.h errno.h wchar.h \
	ctype.h strings.h wctype.h math.h stdio.h dlfcn.h inttypes.h \
	malloc.h signal.h fcntl.h assert.h locale.h setjmp.h time.h \
	link.h gnu-versions.h elf.h

LIBC_GEN_SYS_SYMLINKS = types.h stat.h sem.h

LIBC_DIR    = $(shell pwd)/build/libc/include
LIBC_STUB_H = $(GENODE_DIR)/tool/libgcc_libc_stub.h

LIBC = $(addprefix $(LIBC_DIR)/,$(LIBC_GEN_SYMLINKS)) \
       $(addprefix $(LIBC_DIR)/sys/,$(LIBC_GEN_SYS_SYMLINKS))

$(LIBC_DIR) $(LIBC_DIR)/sys:
	$(VERBOSE)mkdir -p $@

$(addprefix $(LIBC_DIR)/,$(LIBC_GEN_SYMLINKS)): $(LIBC_DIR)
	$(VERBOSE)ln -sf $(LIBC_STUB_H) $@

$(addprefix $(LIBC_DIR)/sys/,$(LIBC_GEN_SYS_SYMLINKS)): $(LIBC_DIR)/sys
	$(VERBOSE)ln -sf $(LIBC_STUB_H) $@

#
# 'configure' parameters for binutils, gcc and gdb
#

LOCAL_INSTALL_LOCATION = $(shell pwd)/build/install

#
# Local install location for gmp, mpfr, and mpc libraries. These libraries are
# requried at build time of gcc. We install them locally before invoking the
# gcc build. Because the libs do not need to be included in the tool-chain
# package (they are statically linked against gcc), we install them to a
# different install location as gcc.
#
LOCAL_LIB_INSTALL_LOCATION = $(shell pwd)/build/lib-install

TARGET_NAME_x86        = x86_64-elf
TARGET_NAME_microblaze = microblaze-elf
TARGET_NAME_arm        = arm-elf-eabi

ifneq ($(VERBOSE),)
CONFIG_QUIET = --quiet
MAKEFLAGS   += --quiet
export MAKEFLAGS
endif

COMMON_CONFIG = $(CONFIG_QUIET) \
                --prefix=$(LOCAL_INSTALL_LOCATION) \
                --program-prefix=genode-$(PLATFORM)- \
                --target=$(TARGET_NAME_$(PLATFORM)) \
                --program-transform-name="s/$(TARGET_NAME_$(PLATFORM))/$(PLATFORM)/"

BINUTILS_CONFIG += $(COMMON_CONFIG) --disable-werror

#
# Prevent GNU assembler from treating '/' as the start of a comment. In
# 'gas/config/tc-i386.c', the policy of handling '/' is defined. For Linux, '/'
# is treated as division, which we expect. To apply this needed policy for our
# plain 'elf' version gas, we supply the definition of 'TE_LINUX' by hand.
# Fortunately, this define is not used outside of gas.
#
BINUTILS_CONFIG += CFLAGS=-DTE_LINUX

#
# Add platform-specific binutils configure arguments
#
BINUTILS_CONFIG += $(BINUTILS_CONFIG_$(PLATFORM))

#
# Dummy libc symbols to resolve unresolved references when linking
# 'libgcc_s.so'. Even though, this library is not used on Genode, we want the
# link command to succeed to complete the build process.
#
DUMMY_LIBC_SYMS      = strlen free memcpy malloc memset abort dl_iterate_phdr
LD_PREFIX            = -Wl,
LD_DEFSYM_DUMMY_LIBC = $(addprefix $(LD_PREFIX)--defsym=,$(addsuffix =0,$(DUMMY_LIBC_SYMS)))

GCC_CONFIG += $(COMMON_CONFIG) \
              --with-gnu-as --with-gnu-ld --disable-tls --disable-threads \
              --disable-libstdcxx-pch \
              --enable-shared \
              --with-gmp=$(LOCAL_LIB_INSTALL_LOCATION) \
              --with-mpfr=$(LOCAL_LIB_INSTALL_LOCATION) \
              --with-mpc=$(LOCAL_LIB_INSTALL_LOCATION) \
              CPPFLAGS_FOR_TARGET=-I$(LIBC_DIR) \
              CFLAGS_FOR_TARGET="-I$(LIBC_DIR) -nostdlib $(LD_DEFSYM_DUMMY_LIBC) -fPIC"

GCC_CONFIG += $(GCC_CONFIG_$(PLATFORM))

#
# Configure options passed to gcc
#
# The 't-linux' tmake file is needed to let the tool chain use 'unwind-dw2-fde-glibc',
# needed for the exception handling on Genode in the presence of shared libraries.
#
HOST_CONFIG_ARGS = $(CONFIG_QUIET) \
                   host_xm_include_list=$(LINK_SPEC_H_$(PLATFORM)) \
                   tmake_file='t-slibgcc-elf-ver t-slibgcc-nolc-override t-linux'

# passed to target components such as libgcc, libstdc++
TARGET_CONFIG_ARGS = $(CONFIG_QUIET) \
                     extra_parts='crtbegin.o crtbeginS.o crtbeginT.o crtend.o crtendS.o'

# compile libsupc++ as position-independent code
TARGET_CONFIG_ARGS += LIBSUPCXX_PICFLAGS='-prefer-pic'

GCC_INSTALL_RULE = install-strip
ifeq ($(GCC_VERSION),4.4.5)
GCC_INSTALL_RULE = install
endif

#
# Default linker script
#
# Needed only to make target-configure happy.
#

LD_SCRIPT_microblaze = $(LOCAL_INSTALL_LOCATION)/$(TARGET_NAME_microblaze)/lib/xilinx.ld

$(LD_SCRIPT_$(PLATFORM)):
	$(VERBOSE)mkdir -p $(dir $@)
	$(VERBOSE)touch $@

#
# Link spec
#
# The 'LINK_SPEC' define comprises the rules of how the GCC frontend invokes
# the linker.
#

LINK_SPEC_H_x86 = $(shell pwd)/build/$(PLATFORM)/link_spec.h

$(LINK_SPEC_H_x86):
	$(VERBOSE)echo "#define LINK_SPEC \"%{!m32:-m elf_x86_64} %{m32:-m elf_i386} %{shared:-shared} %{!static:--eh-frame-hdr}\"" > $@

$(LINK_SPEC_H_arm):
	$(VERBOSE)echo "#define LINK_SPEC \"%(shared:-shared) %{!static:--eh-frame-hdr}\"" > $@

#
# Platform-specific multilib support
#

MAKE_OPT_x86 := MULTILIB_OPTIONS="m64/m32" MULTILIB_DIRNAMES="64 32"
MAKE_OPT += $(MAKE_OPT_$(PLATFORM))

#
# Build rules and dependencies between build steps
#
# We use the binaries 'objdump' and 'g++' as representatives for expressing
# dependencies. All other programs will be generated as side effect.
#

BINUTILS_BINARIES           = build/$(PLATFORM)/binutils/binutils/objdump
BINUTILS_INSTALLED_BINARIES = $(LOCAL_INSTALL_LOCATION)/bin/genode-$(PLATFORM)-objdump
GCC_BINARIES                = build/$(PLATFORM)/gcc/gcc/g++
GCC_INSTALLED_BINARIES      = $(LOCAL_INSTALL_LOCATION)/bin/genode-$(PLATFORM)-g++
GDB_BINARIES                = build/$(PLATFORM)/gdb/gdb/gdb
GDB_INSTALLED_BINARIES      = $(LOCAL_INSTALL_LOCATION)/bin/genode-$(PLATFORM)-gdb

build_all: $(GCC_INSTALLED_BINARIES) $(GDB_INSTALLED_BINARIES)

$(DOWNLOAD_DIR):
	$(VERBOSE)mkdir -p $@

$(DOWNLOAD_DIR)/$(BINUTILS_DOWNLOAD_TBZ2): $(DOWNLOAD_DIR)
	$(ECHO) "$(BRIGHT_COL)downloading binutils...$(DEFAULT_COL)"
	$(VERBOSE)wget -c -P $(DOWNLOAD_DIR) $(BINUTILS_DOWNLOAD_URL)/$(BINUTILS_DOWNLOAD_TBZ2) && touch $@

$(DOWNLOAD_DIR)/gcc-core-$(GCC_VERSION).tar.bz2: $(DOWNLOAD_DIR)
	$(ECHO) "$(BRIGHT_COL)downloading gcc...$(DEFAULT_COL)"
	$(VERBOSE)wget -c -P $(DOWNLOAD_DIR) $(GCC_DOWNLOAD_URL)/gcc-$(GCC_VERSION)/gcc-core-$(GCC_VERSION).tar.bz2 && touch $@

$(DOWNLOAD_DIR)/gcc-g++-$(GCC_VERSION).tar.bz2: $(DOWNLOAD_DIR)
	$(ECHO) "$(BRIGHT_COL)downloading g++...$(DEFAULT_COL)"
	$(VERBOSE)wget -c -P $(DOWNLOAD_DIR) $(GCC_DOWNLOAD_URL)/gcc-$(GCC_VERSION)/gcc-g++-$(GCC_VERSION).tar.bz2 && touch $@

$(DOWNLOAD_DIR)/gmp-$(GMP_VERSION).tar.bz2: $(DOWNLOAD_DIR)
	$(ECHO) "$(BRIGHT_COL)downloading gmp...$(DEFAULT_COL)"
	$(VERBOSE)wget -c -P $(DOWNLOAD_DIR) $(GMP_DOWNLOAD_URL)/gmp-$(GMP_VERSION).tar.bz2 && touch $@

$(DOWNLOAD_DIR)/mpfr-$(MPFR_VERSION).tar.bz2: $(DOWNLOAD_DIR)
	$(ECHO) "$(BRIGHT_COL)downloading mpfr...$(DEFAULT_COL)"
	$(VERBOSE)wget -c -P $(DOWNLOAD_DIR) $(MPFR_DOWNLOAD_URL)/mpfr-$(MPFR_VERSION).tar.bz2 && touch $@

$(DOWNLOAD_DIR)/mpc-$(MPC_VERSION).tar.gz: $(DOWNLOAD_DIR)
	$(ECHO) "$(BRIGHT_COL)downloading mpc...$(DEFAULT_COL)"
	$(VERBOSE)wget -c -P $(DOWNLOAD_DIR) $(MPC_DOWNLOAD_URL)/mpc-$(MPC_VERSION).tar.gz && touch $@

$(CONTRIB_DIR)/gmp-$(GMP_VERSION)/configure: $(DOWNLOAD_DIR)/gmp-$(GMP_VERSION).tar.bz2
	$(ECHO) "$(BRIGHT_COL)unpacking gmp...$(DEFAULT_COL)"
	$(VERBOSE)tar xfj $< -C $(CONTRIB_DIR)

$(CONTRIB_DIR)/mpfr-$(MPFR_VERSION)/configure: $(DOWNLOAD_DIR)/mpfr-$(MPFR_VERSION).tar.bz2
	$(ECHO) "$(BRIGHT_COL)unpacking mpfr...$(DEFAULT_COL)"
	$(VERBOSE)tar xfj $< -C $(CONTRIB_DIR)

$(CONTRIB_DIR)/mpc-$(MPC_VERSION)/configure: $(DOWNLOAD_DIR)/mpc-$(MPC_VERSION).tar.gz
	$(ECHO) "$(BRIGHT_COL)unpacking mpc...$(DEFAULT_COL)"
	$(VERBOSE)tar xfz $< -C $(CONTRIB_DIR)

$(CONTRIB_DIR)/gcc-$(GCC_VERSION)/configure: $(addprefix $(DOWNLOAD_DIR)/,gcc-core-$(GCC_VERSION).tar.bz2 gcc-g++-$(GCC_VERSION).tar.bz2)
	$(ECHO) "$(BRIGHT_COL)unpacking gcc and g++...$(DEFAULT_COL)"
	$(VERBOSE)mkdir -p $(CONTRIB_DIR)
	$(VERBOSE)for i in $^ ; do tar xfj $$i -C $(CONTRIB_DIR) ;done
	$(VERBOSE)touch $@
	$(ECHO) "$(BRIGHT_COL)patching gcc build system...$(DEFAULT_COL)"
	@#
	@# Enable support for passing custom 'tmake_file' and 'extra_parts' to the
	@# GCC configure process uncommenting the default initialization of the
	@# respective variables. The 'extra_parts' variable is used to carry the
	@# the information about which crtN files are to be created.
	@#
	@# The 't-386elf' file must the treated to prevent it from defining the
	@# 'EXTRA_PARTS' variable. If defined, the 'libgcc' Makefile would prepare
	@# it against our custom list of 'extra_parts' and consequently fail.
	@#
	$(VERBOSE)sed -i "/^tmake_file=$$/s/^/#/" $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/gcc/config.gcc
	$(VERBOSE)sed -i "/^extra_parts=$$/s/^/#/" $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/gcc/config.gcc
	$(VERBOSE)sed -i "/^extra_parts=$$/s/^/#/" $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/libgcc/config.host
	$(VERBOSE)sed -i "/^EXTRA_PARTS=/s/^/#/" $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/gcc/config/i386/t-i386elf
	$(VERBOSE)sed -i "/^EXTRA_MULTILIB_PARTS *=/s/^/#/" $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/gcc/config/arm/t-arm-elf
	@#
	@# Let 'config.gcc' expand our already populated 'tmake_file' variable rather
	@# than making a hard assignment. This is needed for the ARM platform because
	@# the target 'arm-elf-eabi' actually matches the pattern 'arm-*-*-eabi' in
	@# the 'config.gcc' file.
	@#
	$(VERBOSE)sed -i "/tmake_file=\"arm/s/=\"/=\"\$${tmake_file} /" $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/gcc/config.gcc
	@#
	@# Enable LINK_SPEC customization via configure arguments
	@#
	@# We add a hook for sneaking our custom LINK_SPEC definition into the GCC
	@# configure process by uncommentig the 'host_xm_include_list'. This enables us
	@# to supply a custom header file to be included into 'gcc/config.h' defining
	@# the 'LINK_SPEC' macro. This macro expresses the policy of how the GCC
	@# frontend invokes 'ld' on multiarch platforms. I.e., on x86, we need to pass
	@# '-melf_i386' to 'ld' when building in '-m32' mode.
	@#
	$(VERBOSE)sed -i "/^host_xm_include_list=$$/s/^/#/" $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/gcc/configure.ac
	@#
	@# Make sure to disable the 'inhibit_libc' flag, which is evaluated when
	@# compiling libgcc. When libc is inhibited, the 'unwind-dw2-fde-glibc.c'
	@# is not using the "new" glibc exception handling mechanism. However,
	@# Genode's dynamic linker relies on this mechanism.
	@#
	$(VERBOSE)sed -i "/inhibit_libc=true/s/true/false # was true/" $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/gcc/configure.ac
	@#
	@# Accept prepopulation of 'host_configargs' and 'target_configargs' as
	@# configure argument (only needed for gcc-4.4.5, fixed with later versions)
	@#
	$(VERBOSE)sed -i "/host_configargs=.--cache-file/s/=./=\"\$$host_configargs /" $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/configure.ac
	$(VERBOSE)sed -i "/target_configargs=..baseargs/s/=.*/=\"\$$target_configargs \$${baseargs}\"/" $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/configure.ac
	@#
	@# Allow customization of CPPFLAGS_FOR_TARGET, not supported by the original
	@# GCC config and build system.
	@#
	$(VERBOSE)sed -i "/^CXXFLAGS_FOR_TARGET =/s/^/CPPFLAGS_FOR_TARGET = @CPPFLAGS_FOR_TARGET@\n/" $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/Makefile.tpl
	$(VERBOSE)sed -i "/AC_SUBST(CFLAGS_FOR_TARGET)/s/^/AC_SUBST(CPPFLAGS_FOR_TARGET)\n/"          $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/configure.ac
	@#
	@# Fix the handling of CPP_FOR_TARGET. Without the fix, the configure script
	@# of libgcc tries to use the normal 'cpp' for executing preprocessor tests,
	@# which produces bogus results.
	@#
	$(VERBOSE)sed -i "/CC=.*XGCC.*export CC/s/^/	CPP=\"\$$(CPP_FOR_TARGET) \$$(XGCC_FLAGS_FOR_TARGET) \$$\$$TFLAGS\"; export CPP; \\\\\n/"  $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/Makefile.tpl
	$(VERBOSE)sed -i "/^CC_FOR_TARGET=/s/^/CPP_FOR_TARGET=\$$(STAGE_CC_WRAPPER) @CPP_FOR_TARGET@\n/"                                           $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/Makefile.tpl
	$(VERBOSE)sed -i "/CC=.*XGCC.*TFLAGS....$$/s/^/	'CPP=\$$\$$(CPP_FOR_TARGET) \$$\$$(XGCC_FLAGS_FOR_TARGET) \$$\$$(TFLAGS)' \\\\\n/"         $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/Makefile.tpl
	$(VERBOSE)sed -i "/flag= CC_FOR_TARGET/s/^/flags_to_pass = { flag= CPP_FOR_TARGET ; };\n/"                                                 $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/Makefile.def
	$(VERBOSE)sed -i "/^GCC_TARGET_TOOL.cc,/s/^/GCC_TARGET_TOOL(cpp, CPP_FOR_TARGET, CPP, \[gcc\/cpp -B\$$\$$r\/\$$(HOST_SUBDIR)\/gcc\/\])\n/" $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/configure.ac
	@#
	@# Ensure -fno-short-enums as default.
	@#
	$(VERBOSE)sed -i "s/return TARGET_AAPCS_BASED && arm_abi != ARM_ABI_AAPCS_LINUX/return false/" $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/gcc/config/arm/arm.c
	@#
	@# Remove sanity check for host/target combination in configure script of
	@# libstdc++. An alternative fix would be the addition of a new host or
	@# the use of an existing one. However, adding a new host would require
	@# us to maintain a larger patch to the GCC build system, and using an
	@# existing host comes with all the (possibly unwanted) policies associated
	@# with the respective host platform. We want to stick with the bare-bone
	@# compiler as much as possible.
	@#
	$(VERBOSE)sed -i "/No support for this host.target combination/d" $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/libstdc++-v3/crossconfig.m4
	$(VERBOSE)cd $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/libstdc++-v3; $(AUTOCONF)
	@#
	@# Allow passing of PICFLAGS to the configure script of libstdc++.
	@# Without this change, libsupc++ would be compiled w/o PICFLAGS, resulting
	@# in text relocations. Because for base tool chains, no 'dynamic_linker'
	@# is defined (see 'libtool.m4'), 'dynamic_linker' is set to 'no', which
	@# results in 'can_build_shared = no', which, in turn , results
	@# in 'enable_shared = no', which, in turn, sets 'LIBSUPCXX_PICFLAGS' to
	@# nothing rather then '-prefer-pic'.
	@#
	$(VERBOSE)sed -i "/LIBSUPCXX_PICFLAGS=$$/s/LIB/__LIB/" $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/libstdc++-v3/configure.ac
	@#
	@# Re-generate configure scripts
	@#
	$(VERBOSE)cd $(CONTRIB_DIR)/gcc-$(GCC_VERSION); autogen Makefile.def
	$(VERBOSE)cd $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/libgcc; $(AUTOCONF)
	$(VERBOSE)cd $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/libstdc++-v3; $(AUTOCONF)
	$(VERBOSE)cd $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/gcc; $(AUTOCONF)
	$(VERBOSE)cd $(CONTRIB_DIR)/gcc-$(GCC_VERSION); $(AUTOCONF)
	@#
	@# Fix a bug in gcc 4.6.1 that causes compile errors when building Qt4 for ARM
	@# More detailed description at and solution from http://gcc.gnu.org/ml/gcc-patches/2010-11/msg02245.html
	@#
ifeq ($(GCC_VERSION),4.6.1)
	$(ECHO) "$(BRIGHT_COL)patching gcc...$(DEFAULT_COL)"
	$(VERBOSE)sed -i "/|| (volatilep && flag_strict_volatile_bitfields > 0/s/)/ \&\& (bitpos % GET_MODE_ALIGNMENT (mode) != 0))/" $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/gcc/expr.c
endif

$(CONTRIB_DIR)/binutils-$(BINUTILS_VERSION)/configure: $(DOWNLOAD_DIR)/$(BINUTILS_DOWNLOAD_TBZ2)
	$(ECHO) "$(BRIGHT_COL)unpacking binutils...$(DEFAULT_COL)"
	$(VERBOSE)mkdir -p $(CONTRIB_DIR)
	$(VERBOSE)tar xfj $^ -C $(CONTRIB_DIR) && touch $@

build/$(PLATFORM)/binutils/Makefile: $(CONTRIB_DIR)/binutils-$(BINUTILS_VERSION)/configure
	$(ECHO) "$(BRIGHT_COL)configuring binutils...$(DEFAULT_COL)"
	$(VERBOSE)mkdir -p $(dir $@)
	$(VERBOSE)cd $(dir $@); ../../../$(CONTRIB_DIR)/binutils-$(BINUTILS_VERSION)/configure $(BINUTILS_CONFIG)

$(BINUTILS_BINARIES): build/$(PLATFORM)/binutils/Makefile
	$(ECHO) "$(BRIGHT_COL)builing binutils...$(DEFAULT_COL)"
	$(VERBOSE)$(MAKE) -C $(dir $<) $(MAKE_OPT)

$(BINUTILS_INSTALLED_BINARIES): $(BINUTILS_BINARIES)
	$(ECHO) "$(BRIGHT_COL)installing binutils...$(DEFAULT_COL)"
	$(VERBOSE)for i in binutils gas ld intl opcodes; do \
		$(MAKE) -C build/$(PLATFORM)/binutils/$$i install-strip; done
	$(VERBOSE)$(MAKE) -C build/$(PLATFORM)/binutils/libiberty install

COMMON_LIB_CONFIG = --prefix=$(LOCAL_LIB_INSTALL_LOCATION) \
                    --disable-shared --enable-static

GMP_CONFIG  = $(COMMON_LIB_CONFIG)
MPFR_CONFIG = $(COMMON_LIB_CONFIG) --with-gmp=$(LOCAL_LIB_INSTALL_LOCATION)
MPC_CONFIG  = $(COMMON_LIB_CONFIG) --with-gmp=$(LOCAL_LIB_INSTALL_LOCATION) \
                                   --with-mpfr=$(LOCAL_LIB_INSTALL_LOCATION)

$(LOCAL_LIB_INSTALL_LOCATION)/lib/libgmp.a:  build/gmp/Makefile
$(LOCAL_LIB_INSTALL_LOCATION)/lib/libmpfr.a: build/mpfr/Makefile
$(LOCAL_LIB_INSTALL_LOCATION)/lib/libmpc.a:  build/mpc/Makefile

# rule to build libgmp, libmpfr, and libmpc
$(LOCAL_LIB_INSTALL_LOCATION)/lib/lib%.a:
	$(ECHO) "$(BRIGHT_COL)building lib$*...$(DEFAULT_COL)"
	$(VERBOSE)make -C build/$* all install

build/gmp/Makefile: $(CONTRIB_DIR)/gmp-$(GMP_VERSION)/configure

build/gmp/Makefile:
	$(ECHO) "$(BRIGHT_COL)configuring libgmp...$(DEFAULT_COL)"
	$(VERBOSE)mkdir -p $(dir $@)
	$(VERBOSE)cd $(dir $@); \
		../../$(CONTRIB_DIR)/gmp-$(GMP_VERSION)/configure $(GMP_CONFIG)

build/mpfr/Makefile: $(CONTRIB_DIR)/mpfr-$(MPFR_VERSION)/configure \
                     $(LOCAL_LIB_INSTALL_LOCATION)/lib/libgmp.a

build/mpfr/Makefile:
	$(ECHO) "$(BRIGHT_COL)configuring libmpfr...$(DEFAULT_COL)"
	$(VERBOSE)mkdir -p $(dir $@)
	$(VERBOSE)cd $(dir $@); \
		../../$(CONTRIB_DIR)/mpfr-$(MPFR_VERSION)/configure $(MPFR_CONFIG)

build/mpc/Makefile: $(CONTRIB_DIR)/mpc-$(MPC_VERSION)/configure \
                    $(LOCAL_LIB_INSTALL_LOCATION)/lib/libgmp.a \
                    $(LOCAL_LIB_INSTALL_LOCATION)/lib/libmpfr.a

build/mpc/Makefile:
	$(ECHO) "$(BRIGHT_COL)configuring libmpc...$(DEFAULT_COL)"
	$(VERBOSE)mkdir -p $(dir $@)
	$(VERBOSE)cd $(dir $@); \
		../../$(CONTRIB_DIR)/mpc-$(MPC_VERSION)/configure $(MPC_CONFIG)

build/$(PLATFORM)/gcc/Makefile: $(CONTRIB_DIR)/gcc-$(GCC_VERSION)/configure \
                                $(BINUTILS_INSTALLED_BINARIES) \
                                $(LOCAL_LIB_INSTALL_LOCATION)/lib/libgmp.a \
                                $(LOCAL_LIB_INSTALL_LOCATION)/lib/libmpfr.a \
                                $(LOCAL_LIB_INSTALL_LOCATION)/lib/libmpc.a

build/$(PLATFORM)/gcc/Makefile:
	$(ECHO) "$(BRIGHT_COL)configuring gcc...$(DEFAULT_COL)"
	$(VERBOSE)mkdir -p $(dir $@)
	$(VERBOSE)cd $(dir $@); \
		host_configargs="$(HOST_CONFIG_ARGS)" \
		target_configargs="$(TARGET_CONFIG_ARGS)" \
		../../../$(CONTRIB_DIR)/gcc-$(GCC_VERSION)/configure $(GCC_CONFIG)

$(GCC_BINARIES): build/$(PLATFORM)/gcc/Makefile \
                 $(LINK_SPEC_H_$(PLATFORM)) \
                 $(LD_SCRIPT_$(PLATFORM)) \
                 $(LIBC)

$(GCC_BINARIES): build/$(PLATFORM)/gcc/Makefile
	$(ECHO) "$(BRIGHT_COL)builing gcc...$(DEFAULT_COL)"
	$(VERBOSE)$(MAKE) -C $(dir $<) $(MAKE_OPT)

$(GCC_INSTALLED_BINARIES): $(GCC_BINARIES)
	$(ECHO) "$(BRIGHT_COL)installing gcc...$(DEFAULT_COL)"
	$(VERBOSE)$(MAKE) -C build/$(PLATFORM)/gcc $(GCC_INSTALL_RULE)

$(DOWNLOAD_DIR)/gdb-$(GDB_VERSION).tar.bz2: $(DOWNLOAD_DIR)
	$(ECHO) "$(BRIGHT_COL)downloading gdb...$(DEFAULT_COL)"
	$(VERBOSE)wget -c -P $(DOWNLOAD_DIR) $(GDB_DOWNLOAD_URL)/gdb-$(GDB_VERSION).tar.bz2 && touch $@

$(CONTRIB_DIR)/gdb-$(GDB_VERSION)/configure: $(DOWNLOAD_DIR)/gdb-$(GDB_VERSION).tar.bz2
	$(ECHO) "$(BRIGHT_COL)unpacking gdb...$(DEFAULT_COL)"
	$(VERBOSE)mkdir -p $(CONTRIB_DIR)
	$(VERBOSE)tar xfj $^ -C $(CONTRIB_DIR) && touch $@
	$(ECHO) "$(BRIGHT_COL)patching gdb...$(DEFAULT_COL)"
	@#
	@# Include 'solib.o' and 'solib-svr4.o' in arm*-*-* (non-OS) target configuration for shared library support
	@#
	$(VERBOSE)sed -i "s/gdb_target_obs=\"arm-tdep\.o\"$$/gdb_target_obs=\"arm-tdep.o solib.o solib-svr4.o\"/" $(CONTRIB_DIR)/gdb-$(GDB_VERSION)/gdb/configure.tgt
	@#
	@# Add an x86_64-*-* (non-OS) target with shared library support
	@#
	$(VERBOSE)sed -i "/^xtensa\*-\*-linux\*/ s/^/x86_64-*-*)\n\tgdb_target_obs=\"amd64-tdep.o i386-tdep.o i387-tdep.o solib.o solib-svr4.o\"\n\t;;\n/" $(CONTRIB_DIR)/gdb-$(GDB_VERSION)/gdb/configure.tgt
	@#
	@# Enable shared library support
	@#
	$(VERBOSE)sed -i "/^#include \"features\/i386\/amd64-avx\.c\"$$/ s/$$/\n\n#include \"solib-svr4\.h\"/" $(CONTRIB_DIR)/gdb-$(GDB_VERSION)/gdb/amd64-tdep.c
	$(VERBOSE)sed -i "/AMD64 generally uses/ s/^/  set_solib_svr4_fetch_link_map_offsets(gdbarch, svr4_lp64_fetch_link_map_offsets);\n\n/" $(CONTRIB_DIR)/gdb-$(GDB_VERSION)/gdb/amd64-tdep.c
	$(VERBOSE)sed -i "/^#include \"features\/arm-with-m\.c\"$$/ s/$$/\n\n#include \"solib-svr4\.h\"/" $(CONTRIB_DIR)/gdb-$(GDB_VERSION)/gdb/arm-tdep.c
	$(VERBOSE)sed -i "/gdbarch = gdbarch_alloc (&info, tdep);/ s/$$/\n\n  set_solib_svr4_fetch_link_map_offsets(gdbarch, svr4_ilp32_fetch_link_map_offsets);/" $(CONTRIB_DIR)/gdb-$(GDB_VERSION)/gdb/arm-tdep.c
	$(VERBOSE)sed -i "/^#include \"features\/i386\/i386-mmx\.c\"$$/ s/$$/\n\n#include \"solib-svr4\.h\"/" $(CONTRIB_DIR)/gdb-$(GDB_VERSION)/gdb/i386-tdep.c
	$(VERBOSE)sed -i "/gdbarch = gdbarch_alloc (&info, tdep);/ s/$$/\n\n  set_solib_svr4_fetch_link_map_offsets(gdbarch, svr4_ilp32_fetch_link_map_offsets);/" $(CONTRIB_DIR)/gdb-$(GDB_VERSION)/gdb/i386-tdep.c
	@#
	@# Enable software single-stepping on ARM
	@#
	$(VERBOSE)sed -i "/gdbarch = gdbarch_alloc (&info, tdep);/ s/$$/\n\n  set_gdbarch_software_single_step(gdbarch, arm_software_single_step);/" $(CONTRIB_DIR)/gdb-$(GDB_VERSION)/gdb/arm-tdep.c

build/$(PLATFORM)/gdb/Makefile: $(CONTRIB_DIR)/gdb-$(GDB_VERSION)/configure
	$(ECHO) "$(BRIGHT_COL)configuring gdb...$(DEFAULT_COL)"
	$(VERBOSE)mkdir -p $(dir $@)
	$(VERBOSE)cd $(dir $@); \
		../../../$(CONTRIB_DIR)/gdb-$(GDB_VERSION)/configure $(COMMON_CONFIG)

$(GDB_BINARIES): build/$(PLATFORM)/gdb/Makefile
	$(ECHO) "$(BRIGHT_COL)builing gdb...$(DEFAULT_COL)"
	$(VERBOSE)$(MAKE) -C $(dir $<) $(MAKE_OPT)

$(GDB_INSTALLED_BINARIES): $(GDB_BINARIES)
	$(ECHO) "$(BRIGHT_COL)installing gdb...$(DEFAULT_COL)"
	$(VERBOSE)$(MAKE) -C build/$(PLATFORM)/gdb install

#
# Clean rules
#

clean:
	rm -rf $(addprefix $(CONTRIB_DIR)/,binutils-$(BINUTILS_VERSION) gcc-$(GCC_VERSION))
	rm -rf build

cleanall: clean
	rm -rf $(DOWNLOAD_DIR)/$(BINUTILS_DOWNLOAD_TBZ2)
	rm -rf $(DOWNLOAD_DIR)/gcc-core-$(GCC_VERSION).tar.bz2
	rm -rf $(DOWNLOAD_DIR)/gcc-g++-$(GCC_VERSION).tar.bz2

#
# Install rules
#

install: build_all
	$(ECHO) "$(BRIGHT_COL)installing tool chain to '$(INSTALL_LOCATION)'...$(DEFAULT_COL)"
	$(VERBOSE)sudo cp -a --remove-destination --no-target-directory $(LOCAL_INSTALL_LOCATION) $(INSTALL_LOCATION)