99122d6780
- Add support for mips32r6 and mips64r6 target architecture variants - Disable unsupported gcc versions - Disable unsupported binutils versions - Disable unsupported external toolchains - Disable unsuported C libraries - Add a hook in order to make glibc compile for MIPS R6. [Thomas: slightly tweak the glibc hack explanation, to make it hopefully clearer.] Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
155 lines
5.2 KiB
Makefile
155 lines
5.2 KiB
Makefile
################################################################################
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#
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# glibc/eglibc
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#
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################################################################################
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GLIBC_VERSION = $(call qstrip,$(BR2_GLIBC_VERSION_STRING))
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ifeq ($(BR2_TOOLCHAIN_BUILDROOT_EGLIBC),y)
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GLIBC_SITE = http://downloads.yoctoproject.org/releases/eglibc
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GLIBC_SOURCE = eglibc-$(GLIBC_VERSION).tar.bz2
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GLIBC_SRC_SUBDIR = libc
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else
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GLIBC_SITE = $(BR2_GNU_MIRROR)/libc
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GLIBC_SOURCE = glibc-$(GLIBC_VERSION).tar.xz
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GLIBC_SRC_SUBDIR = .
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endif
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GLIBC_LICENSE = GPLv2+ (programs), LGPLv2.1+, BSD-3c, MIT (library)
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GLIBC_LICENSE_FILES = $(addprefix $(GLIBC_SRC_SUBDIR)/,COPYING COPYING.LIB LICENSES)
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# glibc is part of the toolchain so disable the toolchain dependency
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GLIBC_ADD_TOOLCHAIN_DEPENDENCY = NO
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# Before (e)glibc is configured, we must have the first stage
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# cross-compiler and the kernel headers
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GLIBC_DEPENDENCIES = host-gcc-initial linux-headers host-gawk
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GLIBC_SUBDIR = build
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GLIBC_INSTALL_STAGING = YES
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GLIBC_INSTALL_STAGING_OPTS = install_root=$(STAGING_DIR) install
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# Thumb build is broken, build in ARM mode
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ifeq ($(BR2_ARM_INSTRUCTIONS_THUMB),y)
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GLIBC_EXTRA_CFLAGS += -marm
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endif
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# MIPS64 defaults to n32 so pass the correct -mabi if
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# we are using a different ABI. OABI32 is also used
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# in MIPS so we pass -mabi=32 in this case as well
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# even though it's not strictly necessary.
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ifeq ($(BR2_MIPS_NABI64),y)
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GLIBC_EXTRA_CFLAGS += -mabi=64
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else ifeq ($(BR2_MIPS_OABI32),y)
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GLIBC_EXTRA_CFLAGS += -mabi=32
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endif
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ifeq ($(BR2_ENABLE_DEBUG),y)
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GLIBC_EXTRA_CFLAGS += -g
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endif
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# The stubs.h header is not installed by install-headers, but is
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# needed for the gcc build. An empty stubs.h will work, as explained
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# in http://gcc.gnu.org/ml/gcc/2002-01/msg00900.html. The same trick
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# is used by Crosstool-NG.
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ifeq ($(BR2_TOOLCHAIN_BUILDROOT_GLIBC),y)
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define GLIBC_ADD_MISSING_STUB_H
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mkdir -p $(STAGING_DIR)/usr/include/gnu
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touch $(STAGING_DIR)/usr/include/gnu/stubs.h
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endef
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endif
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# Even though we use the autotools-package infrastructure, we have to
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# override the default configure commands for several reasons:
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#
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# 1. We have to build out-of-tree, but we can't use the same
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# 'symbolic link to configure' used with the gcc packages.
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#
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# 2. We have to execute the configure script with bash and not sh.
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#
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# Note that as mentionned in
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# http://patches.openembedded.org/patch/38849/, eglibc/glibc must be
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# built with -O2, so we pass our own CFLAGS and CXXFLAGS below.
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define GLIBC_CONFIGURE_CMDS
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mkdir -p $(@D)/build
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# Do the configuration
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(cd $(@D)/build; \
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$(TARGET_CONFIGURE_OPTS) \
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CFLAGS="-O2 $(GLIBC_EXTRA_CFLAGS)" CPPFLAGS="" \
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CXXFLAGS="-O2 $(GLIBC_EXTRA_CFLAGS)" \
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$(SHELL) $(@D)/$(GLIBC_SRC_SUBDIR)/configure \
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ac_cv_path_BASH_SHELL=/bin/bash \
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libc_cv_forced_unwind=yes \
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libc_cv_ssp=no \
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--target=$(GNU_TARGET_NAME) \
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--host=$(GNU_TARGET_NAME) \
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--build=$(GNU_HOST_NAME) \
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--prefix=/usr \
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--enable-shared \
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$(if $(BR2_SOFT_FLOAT),--without-fp,--with-fp) \
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$(if $(BR2_x86_64),--enable-lock-elision) \
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--with-pkgversion="Buildroot" \
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--without-cvs \
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--disable-profile \
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--without-gd \
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--enable-obsolete-rpc \
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--with-headers=$(STAGING_DIR)/usr/include)
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$(GLIBC_ADD_MISSING_STUB_H)
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endef
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#
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# We also override the install to target commands since we only want
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# to install the libraries, and nothing more.
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#
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GLIBC_LIBS_LIB = \
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ld*.so.* libc.so.* libcrypt.so.* libdl.so.* libgcc_s.so.* libm.so.* \
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libnsl.so.* libpthread.so.* libresolv.so.* librt.so.* libutil.so.* \
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libnss_files.so.* libnss_dns.so.*
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ifeq ($(BR2_PACKAGE_GDB),y)
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GLIBC_LIBS_LIB += libthread_db.so.*
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endif
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define GLIBC_INSTALL_TARGET_CMDS
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for libs in $(GLIBC_LIBS_LIB); do \
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$(call copy_toolchain_lib_root,$(STAGING_DIR)/,,lib,$$libs,/lib) ; \
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done
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endef
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# MIPS R6 requires to have NaN2008 support which is currently not
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# supported by the Linux kernel. In order to prevent building the
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# glibc against kernels not having NaN2008 support on platforms that
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# requires it, glibc currently checks for an (inexisting) 10.0.0
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# kernel headers version.
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#
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# Since in practice the kernel support for NaN2008 is not really
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# required for things to work properly, we adjust the glibc check to
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# make it believe that NaN2008 support was added in the kernel
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# starting from version 4.0.0.
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#
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# In general the compatibility issues introduced by mis-matched NaN
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# encodings will not cause a problem as signalling NaNs are rarely used
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# in average code. For MIPS R6 there isn't actually any compatibility
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# issue as the hardware is always NaN2008 and software is always
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# NaN2008. The problem only comes from when older MIPS code is linked in
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# via a DSO and multiple NaN encodings are introduced. Since Buildroot
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# is intended to have all code built from source then this scenario is
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# highly unlikely. The failure mode, if it ever occurs, would be either
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# that a signalling NaN fails to raise an invalid operation exception or
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# (more likely) an ordinary NaN raises an invalid operation exception.
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ifeq ($(BR2_mips_32r6)$(BR2_mips_64r6),y)
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define GLIBC_FIX_MIPS_R6
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$(SED) 's#10.0.0#4.0.0#' \
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$(@D)/sysdeps/unix/sysv/linux/mips/configure \
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$(@D)/sysdeps/unix/sysv/linux/mips/configure.ac
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endef
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GLIBC_POST_EXTRACT_HOOKS += GLIBC_FIX_MIPS_R6
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endif
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$(eval $(autotools-package))
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