################################################################################
#
# glibc
#
################################################################################

ifeq ($(BR2_arc),y)
GLIBC_VERSION =  arc-2018.03-release
GLIBC_SITE = $(call github,foss-for-synopsys-dwc-arc-processors,glibc,$(GLIBC_VERSION))
else
# Generate version string using:
#   git describe --match 'glibc-*' --abbrev=40 origin/release/MAJOR.MINOR/master
GLIBC_VERSION = glibc-2.27-57-g6c99e37f6fb640a50a3113b2dbee5d5389843c1e
# Upstream doesn't officially provide an https download link.
# There is one (https://sourceware.org/git/glibc.git) but it's not reliable,
# sometimes the connection times out. So use an unofficial github mirror.
# When updating the version, check it on the official repository;
# *NEVER* decide on a version string by looking at the mirror.
# Then check that the mirror has been synced already (happens once a day.)
GLIBC_SITE = $(call github,bminor,glibc,$(GLIBC_VERSION))
endif

GLIBC_LICENSE = GPL-2.0+ (programs), LGPL-2.1+, BSD-3-Clause, MIT (library)
GLIBC_LICENSE_FILES = COPYING COPYING.LIB LICENSES

# glibc is part of the toolchain so disable the toolchain dependency
GLIBC_ADD_TOOLCHAIN_DEPENDENCY = NO

# Before glibc is configured, we must have the first stage
# cross-compiler and the kernel headers
GLIBC_DEPENDENCIES = host-gcc-initial linux-headers host-bison host-gawk

GLIBC_SUBDIR = build

GLIBC_INSTALL_STAGING = YES

GLIBC_INSTALL_STAGING_OPTS = install_root=$(STAGING_DIR) install

# Thumb build is broken, build in ARM mode
ifeq ($(BR2_ARM_INSTRUCTIONS_THUMB),y)
GLIBC_EXTRA_CFLAGS += -marm
endif

# MIPS64 defaults to n32 so pass the correct -mabi if
# we are using a different ABI. OABI32 is also used
# in MIPS so we pass -mabi=32 in this case as well
# even though it's not strictly necessary.
ifeq ($(BR2_MIPS_NABI64),y)
GLIBC_EXTRA_CFLAGS += -mabi=64
else ifeq ($(BR2_MIPS_OABI32),y)
GLIBC_EXTRA_CFLAGS += -mabi=32
endif

ifeq ($(BR2_ENABLE_DEBUG),y)
GLIBC_EXTRA_CFLAGS += -g
endif

# The stubs.h header is not installed by install-headers, but is
# needed for the gcc build. An empty stubs.h will work, as explained
# in http://gcc.gnu.org/ml/gcc/2002-01/msg00900.html. The same trick
# is used by Crosstool-NG.
ifeq ($(BR2_TOOLCHAIN_BUILDROOT_GLIBC),y)
define GLIBC_ADD_MISSING_STUB_H
	mkdir -p $(STAGING_DIR)/usr/include/gnu
	touch $(STAGING_DIR)/usr/include/gnu/stubs.h
endef
endif

# Even though we use the autotools-package infrastructure, we have to
# override the default configure commands for several reasons:
#
#  1. We have to build out-of-tree, but we can't use the same
#     'symbolic link to configure' used with the gcc packages.
#
#  2. We have to execute the configure script with bash and not sh.
#
# Note that as mentionned in
# http://patches.openembedded.org/patch/38849/, glibc must be
# built with -O2, so we pass our own CFLAGS and CXXFLAGS below.
define GLIBC_CONFIGURE_CMDS
	mkdir -p $(@D)/build
	# Do the configuration
	(cd $(@D)/build; \
		$(TARGET_CONFIGURE_OPTS) \
		CFLAGS="-O2 $(GLIBC_EXTRA_CFLAGS)" CPPFLAGS="" \
		CXXFLAGS="-O2 $(GLIBC_EXTRA_CFLAGS)" \
		$(SHELL) $(@D)/configure \
		ac_cv_path_BASH_SHELL=/bin/bash \
		libc_cv_forced_unwind=yes \
		libc_cv_ssp=no \
		--target=$(GNU_TARGET_NAME) \
		--host=$(GNU_TARGET_NAME) \
		--build=$(GNU_HOST_NAME) \
		--prefix=/usr \
		--enable-shared \
		$(if $(BR2_SOFT_FLOAT),--without-fp,--with-fp) \
		$(if $(BR2_x86_64),--enable-lock-elision) \
		--with-pkgversion="Buildroot" \
		--without-cvs \
		--disable-profile \
		--without-gd \
		--enable-obsolete-rpc \
		--enable-obsolete-nsl \
		--enable-kernel=$(call qstrip,$(BR2_TOOLCHAIN_HEADERS_AT_LEAST)) \
		--with-headers=$(STAGING_DIR)/usr/include)
	$(GLIBC_ADD_MISSING_STUB_H)
endef

#
# We also override the install to target commands since we only want
# to install the libraries, and nothing more.
#

GLIBC_LIBS_LIB = \
	ld*.so.* libanl.so.* libc.so.* libcrypt.so.* libdl.so.* libgcc_s.so.* \
	libm.so.* libnsl.so.* libpthread.so.* libresolv.so.* librt.so.* \
	libutil.so.* libnss_files.so.* libnss_dns.so.* libmvec.so.*

ifeq ($(BR2_PACKAGE_GDB),y)
GLIBC_LIBS_LIB += libthread_db.so.*
endif

define GLIBC_INSTALL_TARGET_CMDS
	for libpattern in $(GLIBC_LIBS_LIB); do \
		$(call copy_toolchain_lib_root,$$libpattern) ; \
	done
endef

$(eval $(autotools-package))