GCC_KERNEL_VERSION:=$(KERNEL_TOOLCHAIN_GCC_VERSION)
GCC_KERNEL_MAJOR_VERSION:=$(call GET_MAJOR_VERSION,$(GCC_KERNEL_VERSION),$(if $(FREETZ_KERNEL_GCC_5),1,2))
GCC_KERNEL_SOURCE:=gcc-$(GCC_KERNEL_VERSION).tar.$(if $(FREETZ_KERNEL_GCC_5),xz,bz2)
GCC_KERNEL_SITE:=@GNU/gcc/gcc-$(GCC_KERNEL_VERSION)
GCC_KERNEL_DIR:=$(KERNEL_TOOLCHAIN_DIR)/gcc-$(GCC_KERNEL_VERSION)
GCC_KERNEL_MAKE_DIR:=$(TOOLCHAIN_DIR)/make/kernel/gcc
GCC_KERNEL_BUILD_DIR:=$(KERNEL_TOOLCHAIN_DIR)/gcc-$(GCC_KERNEL_VERSION)-build

GCC_KERNEL_MD5_3.4.6 := 4a21ac777d4b5617283ce488b808da7b
GCC_KERNEL_MD5_4.6.4 := b407a3d1480c11667f293bfb1f17d1a4
GCC_KERNEL_MD5_4.7.4 := 4c696da46297de6ae77a82797d2abe28
GCC_KERNEL_MD5_4.8.5 := 80d2c2982a3392bb0b89673ff136e223
GCC_KERNEL_MD5_5.5.0 := 0f70424213b4a1113c04ba66ddda0c1f
GCC_KERNEL_MD5       := $(GCC_KERNEL_MD5_$(GCC_KERNEL_VERSION))

GCC_KERNEL_INITIAL_PREREQ=

ifndef KERNEL_TOOLCHAIN_NO_MPFR
GCC_KERNEL_DECIMAL_FLOAT  := --disable-decimal-float

GCC_KERNEL_INITIAL_PREREQ += $(GMP_HOST_BINARY) $(MPFR_HOST_BINARY) $(MPC_HOST_BINARY)
GCC_KERNEL_WITH_HOST_GMP   = --with-gmp=$(GMP_HOST_DESTDIR)
GCC_KERNEL_WITH_HOST_MPFR  = --with-mpfr=$(MPFR_HOST_DESTDIR)
GCC_KERNEL_WITH_HOST_MPC   = --with-mpc=$(MPC_HOST_DESTDIR)
endif

GCC_KERNEL_EXTRA_MAKE_OPTIONS := MAKEINFO=true

gcc-kernel-source: $(DL_DIR)/$(GCC_KERNEL_SOURCE)
$(DL_DIR)/$(GCC_KERNEL_SOURCE): | $(DL_DIR)
	$(DL_TOOL) $(DL_DIR) $(GCC_KERNEL_SOURCE) $(GCC_KERNEL_SITE) $(GCC_KERNEL_MD5)

gcc-kernel-unpacked: $(GCC_KERNEL_DIR)/.unpacked
$(GCC_KERNEL_DIR)/.unpacked: $(DL_DIR)/$(GCC_KERNEL_SOURCE) | $(KERNEL_TOOLCHAIN_DIR) $(UNPACK_TARBALL_PREREQUISITES)
	$(RM) -r $(GCC_KERNEL_DIR)
	$(call UNPACK_TARBALL,$(DL_DIR)/$(GCC_KERNEL_SOURCE),$(KERNEL_TOOLCHAIN_DIR))
	$(call APPLY_PATCHES,$(GCC_KERNEL_MAKE_DIR)/$(GCC_KERNEL_MAJOR_VERSION),$(GCC_KERNEL_DIR))
	touch $@

$(GCC_KERNEL_BUILD_DIR)/.configured: $(GCC_KERNEL_DIR)/.unpacked $(GCC_KERNEL_INITIAL_PREREQ) | binutils-kernel
	mkdir -p $(GCC_KERNEL_BUILD_DIR)
	(cd $(GCC_KERNEL_BUILD_DIR); PATH=$(KERNEL_TOOLCHAIN_PATH) \
		CC="$(TOOLCHAIN_HOSTCC)" \
		CFLAGS="$(TOOLCHAIN_HOST_CFLAGS)" \
		CXXFLAGS="$(TOOLCHAIN_HOST_CFLAGS)" \
		$(GCC_KERNEL_DIR)/configure \
		--enable-option-checking \
		--prefix=$(KERNEL_TOOLCHAIN_STAGING_DIR) \
		--build=$(GNU_HOST_NAME) \
		--host=$(GNU_HOST_NAME) \
		--target=$(REAL_GNU_KERNEL_NAME) \
		--enable-languages=c \
		--disable-shared \
		--with-newlib \
		--disable-libssp \
		--with-gnu-as \
		--with-gnu-ld \
		--without-headers \
		--disable-threads \
		--disable-multilib \
		$(strip $(GCC_COMMON_CONFIGURE_OPTIONS_HW_CAPABILITIES)) \
		$(GCC_KERNEL_DECIMAL_FLOAT) \
		$(GCC_KERNEL_WITH_HOST_GMP) \
		$(GCC_KERNEL_WITH_HOST_MPFR) \
		$(GCC_KERNEL_WITH_HOST_MPC) \
		--disable-nls \
	);
	touch $@

$(GCC_KERNEL_BUILD_DIR)/.compiled: $(GCC_KERNEL_BUILD_DIR)/.configured
	PATH=$(KERNEL_TOOLCHAIN_PATH) $(MAKE) $(GCC_KERNEL_EXTRA_MAKE_OPTIONS) -C $(GCC_KERNEL_BUILD_DIR) all-gcc
	touch $@

$(KERNEL_CROSS_COMPILER): $(GCC_KERNEL_BUILD_DIR)/.compiled
	PATH=$(KERNEL_TOOLCHAIN_PATH) $(MAKE1) $(GCC_KERNEL_EXTRA_MAKE_OPTIONS) -C $(GCC_KERNEL_BUILD_DIR) install-gcc
	$(call GCC_INSTALL_COMMON,$(KERNEL_TOOLCHAIN_STAGING_DIR),$(GCC_KERNEL_MAJOR_VERSION),$(REAL_GNU_KERNEL_NAME),$(HOST_STRIP))
	$(call REMOVE_DOC_NLS_DIRS,$(KERNEL_TOOLCHAIN_STAGING_DIR))

gcc-kernel: binutils-kernel $(KERNEL_CROSS_COMPILER)

gcc-kernel-uninstall:
	$(RM) $(call TOOLCHAIN_BINARIES_LIST,$(KERNEL_TOOLCHAIN_STAGING_DIR),$(GCC_BINARIES_BIN),$(REAL_GNU_KERNEL_NAME))
	$(RM) -r $(KERNEL_TOOLCHAIN_STAGING_DIR)/{lib,libexec}/gcc

gcc-kernel-clean: gcc-kernel-uninstall
	$(RM) -r $(GCC_KERNEL_BUILD_DIR)

gcc-kernel-dirclean: gcc-kernel-clean
	$(RM) -r $(GCC_KERNEL_DIR)

.PHONY: gcc-kernel gcc-kernel-source gcc-kernel-unpacked gcc-kernel-uninstall gcc-kernel-clean gcc-kernel-dirclean