buildroot/package/glibc/glibc.mk
Romain Naour 6577049128 package/glibc: disable Werror for gcc 10 build
Currently glibc 2.30 is build by default with Werror enabled but it
has only been tested with compiler version available at the time of
the release [1] (gcc 6.2 up to gcc 9.2.1). It's recommended to use
those version with glibc 2.30.

For the same reason why we remove Werror in packages's compiler
flags. Building with Werror is not bulletproof when we start
using a newer compiler that introduce new warnings.
This is the case here with gcc 10, as reported by Yegor Yefremov
[2].

Fixing compiler warnings would require backporting many patches [3]
not even backported by Glibc maintainers to the 2.30 stable
branch. Instead, disable Werror by using --disable-werror.
Most (if not all) gcc 10 warnings will be fixed with Glibc 2.31.

[1] https://sourceware.org/git/?p=glibc.git;a=blob;f=INSTALL;h=62e78725f57080a1cb638cccd28ca3c2ffc5a22c#l466
[2] http://lists.busybox.net/pipermail/buildroot/2020-June/285715.html
[3] https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=cba932a5a9e91cffd7f4172d7e91f9b2efb1f84b
    https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=de18a7061c9bdff73d66502c55d6a3ea671fc6d9
    https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=49348beafe9ba150c9bd48595b3f372299bddbb0
    https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=70c6e15654928c603c6d24bd01cf62e7a8e2ce9b
    https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=c7bf5ceab6ec776ac7350d3b0190776bf532ac54
    https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=e1d559f337de2c8ab68a6749dfe873477c883807

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Yegor Yefremov <yegorslists@googlemail.com>
Tested-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
2020-06-29 22:35:10 +02:00

177 lines
5.8 KiB
Makefile

################################################################################
#
# glibc
#
################################################################################
ifeq ($(BR2_arc),y)
GLIBC_VERSION = arc-2020.03-release
GLIBC_SITE = $(call github,foss-for-synopsys-dwc-arc-processors,glibc,$(GLIBC_VERSION))
else ifeq ($(BR2_RISCV_32),y)
GLIBC_VERSION = 06983fe52cfe8e4779035c27e8cc5d2caab31531
GLIBC_SITE = $(call github,riscv,riscv-glibc,$(GLIBC_VERSION))
else ifeq ($(BR2_csky),y)
GLIBC_VERSION = 7630ed2fa60caea98f500e4a7a51b88f9bf1e176
GLIBC_SITE = $(call github,c-sky,glibc,$(GLIBC_VERSION))
else
# Generate version string using:
# git describe --match 'glibc-*' --abbrev=40 origin/release/MAJOR.MINOR/master | cut -d '-' -f 2-
# When updating the version, please also update localedef
GLIBC_VERSION = 2.30-67-g4748829f86a458b76642f3e98b1d80f7b868e427
# 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 \
$(BR2_MAKE_HOST_DEPENDENCY) $(BR2_PYTHON3_HOST_DEPENDENCY)
GLIBC_SUBDIR = build
GLIBC_INSTALL_STAGING = YES
GLIBC_INSTALL_STAGING_OPTS = install_root=$(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 $(STAGING_DIR)/usr/include/gnu/stubs.h
endef
endif
GLIBC_CONF_ENV = \
ac_cv_path_BASH_SHELL=/bin/$(if $(BR2_PACKAGE_BASH),bash,sh) \
libc_cv_forced_unwind=yes \
libc_cv_ssp=no
# POSIX shell does not support localization, so remove the corresponding
# syntax from ldd if bash is not selected.
ifeq ($(BR2_PACKAGE_BASH),)
define GLIBC_LDD_NO_BASH
$(SED) 's/$$"/"/g' $(@D)/elf/ldd.bash.in
endef
GLIBC_POST_PATCH_HOOKS += GLIBC_LDD_NO_BASH
endif
# Override the default library locations of /lib64/<abi> and
# /usr/lib64/<abi>/ for RISC-V.
ifeq ($(BR2_riscv),y)
ifeq ($(BR2_RISCV_64),y)
GLIBC_CONF_ENV += libc_cv_slibdir=/lib64 libc_cv_rtlddir=/lib
else
GLIBC_CONF_ENV += libc_cv_slibdir=/lib32 libc_cv_rtlddir=/lib
endif
endif
# glibc requires make >= 4.0 since 2.28 release.
# https://www.sourceware.org/ml/libc-alpha/2018-08/msg00003.html
GLIBC_MAKE = $(BR2_MAKE)
GLIBC_CONF_ENV += ac_cv_prog_MAKE="$(BR2_MAKE)"
# 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)" \
$(GLIBC_CONF_ENV) \
$(SHELL) $(@D)/configure \
--target=$(GNU_TARGET_NAME) \
--host=$(GNU_TARGET_NAME) \
--build=$(GNU_HOST_NAME) \
--prefix=/usr \
--enable-shared \
$(if $(BR2_x86_64),--enable-lock-elision) \
--with-pkgversion="Buildroot" \
--disable-profile \
--disable-werror \
--without-gd \
--enable-obsolete-rpc \
--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.* 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
ifeq ($(BR2_PACKAGE_GLIBC_UTILS),y)
GLIBC_TARGET_UTILS_USR_BIN = posix/getconf elf/ldd
GLIBC_TARGET_UTILS_SBIN = elf/ldconfig
ifeq ($(BR2_SYSTEM_ENABLE_NLS),y)
GLIBC_TARGET_UTILS_USR_BIN += locale/locale
endif
endif
define GLIBC_INSTALL_TARGET_CMDS
for libpattern in $(GLIBC_LIBS_LIB); do \
$(call copy_toolchain_lib_root,$$libpattern) ; \
done
$(foreach util,$(GLIBC_TARGET_UTILS_USR_BIN), \
$(INSTALL) -D -m 0755 $(@D)/build/$(util) $(TARGET_DIR)/usr/bin/$(notdir $(util))
)
$(foreach util,$(GLIBC_TARGET_UTILS_SBIN), \
$(INSTALL) -D -m 0755 $(@D)/build/$(util) $(TARGET_DIR)/sbin/$(notdir $(util))
)
endef
$(eval $(autotools-package))