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kumquat-buildroot/package/gcc/gcc.mk
Alexey Brodkin 3e53b51983 package/gcc: enable __cxa_atexit 
This is what GCC manual says [1]:
-------------------------->8----------------------
--enable-__cxa_atexit

    Define if you want to use __cxa_atexit, rather than atexit,
    to register C++ destructors for local statics and global objects.

    This is essential for fully standards-compliant handling of destructors,
    but requires __cxa_atexit in libc.

    This option is currently only available on systems with GNU libc
    ...
-------------------------->8----------------------

Important disadvantages of a simple atexit() are that [2]:
-------------------------->8----------------------
1999 C Standard only requires that the implementation support 32
registered functions, although most implementations support many more.

More important it does not deal at all with the ability in most implementations
to remove DSOs from a running program image by calling dlclose
prior to program termination.
-------------------------->8----------------------

Also it seems like all libc's we support in Buildroot (Glibc, uClibc and musl)
support __cxa_at_exit() so enable it unconditionally.

FWIW if we look around we'll see:
 1. In OpenEmbedded it is enabled for everything except gcc-cross-initial: [3], [4]
 2. In Crosstool-NG it is enabled by default: [5]
 3. In OpenWrt it is disabled only for uClibc, otherwise enabled: [6]

So I think we should be good with it as well.

[1] https://gcc.gnu.org/install/configure.html
[2] https://itanium-cxx-abi.github.io/cxx-abi/abi.html#dso-dtor-motivation
[3] https://github.com/openembedded/openembedded-core/blob/master/meta/recipes-devtools/gcc/gcc-configure-common.inc#L59
[4] https://github.com/openembedded/openembedded-core/blob/master/meta/recipes-devtools/gcc/gcc-cross-initial.inc#L23
[5] https://github.com/crosstool-ng/crosstool-ng/blob/master/config/cc/gcc.in#L270
[6] https://github.com/openwrt/openwrt/blob/master/toolchain/gcc/common.mk#L170

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Nicolas Cavallari <Nicolas.Cavallari@green-communications.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Mark Corbin <mark.corbin@embecosm.com>
Cc: Romain Naour <romain.naour@gmail.com>
Cc: Peter Korsgaard <peter@korsgaard.com>
Cc: Bernd Kuhls <bernd.kuhls@t-online.de>
Cc: Claudiu Zissulescu <claziss@synopsys.com>
Cc: Cupertino Miranda <cmiranda@synopsys.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
2018-11-29 22:12:38 +01:00

329 lines
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Makefile
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################################################################################
#
# Common variables for the gcc-initial and gcc-final packages.
#
################################################################################
#
# Version, site and source
#
GCC_VERSION = $(call qstrip,$(BR2_GCC_VERSION))
ifeq ($(BR2_GCC_VERSION_ARC),y)
GCC_SITE = $(call github,foss-for-synopsys-dwc-arc-processors,gcc,$(GCC_VERSION))
GCC_SOURCE = gcc-$(GCC_VERSION).tar.gz
else ifeq ($(BR2_or1k),y)
GCC_SITE = $(call github,openrisc,or1k-gcc,$(GCC_VERSION))
GCC_SOURCE = gcc-$(GCC_VERSION).tar.gz
else
GCC_SITE = $(BR2_GNU_MIRROR:/=)/gcc/gcc-$(GCC_VERSION)
# From version 5.5.0, 6.4.0, 7.2.0 and 8.1.0 a bz2 release tarball is not
# provided anymore. Use the xz tarball instead.
ifeq ($(BR2_GCC_VERSION_4_9_X),y)
GCC_SOURCE = gcc-$(GCC_VERSION).tar.bz2
else
GCC_SOURCE = gcc-$(GCC_VERSION).tar.xz
endif
endif
#
# Xtensa special hook
#
define HOST_GCC_XTENSA_OVERLAY_EXTRACT
$(call arch-xtensa-overlay-extract,$(@D),gcc)
endef
#
# Apply patches
#
ifeq ($(ARCH),powerpc)
ifneq ($(BR2_SOFT_FLOAT),)
define HOST_GCC_APPLY_POWERPC_PATCH
$(APPLY_PATCHES) $(@D) package/gcc/$(GCC_VERSION) 1000-powerpc-link-with-math-lib.patch.conditional
endef
endif
endif
# gcc is a special package, not named gcc, but gcc-initial and
# gcc-final, but patches are nonetheless stored in package/gcc in the
# tree, and potentially in BR2_GLOBAL_PATCH_DIR directories as well.
define HOST_GCC_APPLY_PATCHES
for patchdir in \
package/gcc/$(GCC_VERSION) \
$(addsuffix /gcc/$(GCC_VERSION),$(call qstrip,$(BR2_GLOBAL_PATCH_DIR))) \
$(addsuffix /gcc,$(call qstrip,$(BR2_GLOBAL_PATCH_DIR))) ; do \
if test -d $${patchdir}; then \
$(APPLY_PATCHES) $(@D) $${patchdir} \*.patch || exit 1; \
fi; \
done
$(HOST_GCC_APPLY_POWERPC_PATCH)
endef
HOST_GCC_EXCLUDES = \
libjava/* libgo/*
#
# Create 'build' directory and configure symlink
#
define HOST_GCC_CONFIGURE_SYMLINK
mkdir -p $(@D)/build
ln -sf ../configure $(@D)/build/configure
endef
#
# Common configuration options
#
HOST_GCC_COMMON_DEPENDENCIES = \
host-binutils \
host-gmp \
host-mpc \
host-mpfr \
$(if $(BR2_BINFMT_FLAT),host-elf2flt)
HOST_GCC_COMMON_CONF_OPTS = \
--target=$(GNU_TARGET_NAME) \
--with-sysroot=$(STAGING_DIR) \
--enable-__cxa_atexit \
--with-gnu-ld \
--disable-libssp \
--disable-multilib \
--disable-decimal-float \
--with-gmp=$(HOST_DIR) \
--with-mpc=$(HOST_DIR) \
--with-mpfr=$(HOST_DIR) \
--with-pkgversion="Buildroot $(BR2_VERSION_FULL)" \
--with-bugurl="http://bugs.buildroot.net/"
# Don't build documentation. It takes up extra space / build time,
# and sometimes needs specific makeinfo versions to work
HOST_GCC_COMMON_CONF_ENV = \
MAKEINFO=missing
GCC_COMMON_TARGET_CFLAGS = $(TARGET_CFLAGS)
GCC_COMMON_TARGET_CXXFLAGS = $(TARGET_CXXFLAGS)
# Propagate options used for target software building to GCC target libs
HOST_GCC_COMMON_CONF_ENV += CFLAGS_FOR_TARGET="$(GCC_COMMON_TARGET_CFLAGS)"
HOST_GCC_COMMON_CONF_ENV += CXXFLAGS_FOR_TARGET="$(GCC_COMMON_TARGET_CXXFLAGS)"
# libitm needs sparc V9+
ifeq ($(BR2_sparc_v8)$(BR2_sparc_leon3),y)
HOST_GCC_COMMON_CONF_OPTS += --disable-libitm
endif
# libmpx uses secure_getenv and struct _libc_fpstate not present in musl
ifeq ($(BR2_TOOLCHAIN_BUILDROOT_MUSL)$(BR2_TOOLCHAIN_GCC_AT_LEAST_6),yy)
HOST_GCC_COMMON_CONF_OPTS += --disable-libmpx
endif
# quadmath support requires wchar
ifeq ($(BR2_USE_WCHAR)$(BR2_TOOLCHAIN_HAS_LIBQUADMATH),yy)
HOST_GCC_COMMON_CONF_OPTS += --enable-libquadmath
else
HOST_GCC_COMMON_CONF_OPTS += --disable-libquadmath
endif
# libsanitizer requires wordexp, not in default uClibc config. Also
# doesn't build properly with musl.
ifeq ($(BR2_TOOLCHAIN_BUILDROOT_UCLIBC)$(BR2_TOOLCHAIN_BUILDROOT_MUSL),y)
HOST_GCC_COMMON_CONF_OPTS += --disable-libsanitizer
endif
# libsanitizer is broken for SPARC
# https://bugs.busybox.net/show_bug.cgi?id=7951
ifeq ($(BR2_sparc)$(BR2_sparc64),y)
HOST_GCC_COMMON_CONF_OPTS += --disable-libsanitizer
endif
# TLS support is not needed on uClibc/no-thread and
# uClibc/linux-threads, otherwise, for all other situations (glibc,
# musl and uClibc/NPTL), we need it.
ifeq ($(BR2_TOOLCHAIN_BUILDROOT_UCLIBC)$(BR2_PTHREADS)$(BR2_PTHREADS_NONE),yy)
HOST_GCC_COMMON_CONF_OPTS += --disable-tls
else
HOST_GCC_COMMON_CONF_OPTS += --enable-tls
endif
ifeq ($(BR2_GCC_ENABLE_LTO),y)
HOST_GCC_COMMON_CONF_OPTS += --enable-plugins --enable-lto
endif
ifeq ($(BR2_GCC_ENABLE_LIBMUDFLAP),y)
HOST_GCC_COMMON_CONF_OPTS += --enable-libmudflap
else
HOST_GCC_COMMON_CONF_OPTS += --disable-libmudflap
endif
ifeq ($(BR2_PTHREADS_NONE),y)
HOST_GCC_COMMON_CONF_OPTS += \
--disable-threads \
--disable-libitm \
--disable-libatomic
else
HOST_GCC_COMMON_CONF_OPTS += --enable-threads
endif
# gcc 5 doesn't need cloog any more, see
# https://gcc.gnu.org/gcc-5/changes.html and we don't support graphite
# on GCC 4.9.x, so only isl is needed.
ifeq ($(BR2_GCC_ENABLE_GRAPHITE),y)
HOST_GCC_COMMON_DEPENDENCIES += host-isl
HOST_GCC_COMMON_CONF_OPTS += --with-isl=$(HOST_DIR)
else
HOST_GCC_COMMON_CONF_OPTS += --without-isl --without-cloog
endif
ifeq ($(BR2_arc)$(BR2_or1k),y)
HOST_GCC_COMMON_DEPENDENCIES += host-flex host-bison
endif
ifeq ($(BR2_SOFT_FLOAT),y)
# only mips*-*-*, arm*-*-* and sparc*-*-* accept --with-float
# powerpc seems to be needing it as well
ifeq ($(BR2_arm)$(BR2_armeb)$(BR2_mips)$(BR2_mipsel)$(BR2_mips64)$(BR2_mips64el)$(BR2_powerpc)$(BR2_sparc),y)
HOST_GCC_COMMON_CONF_OPTS += --with-float=soft
endif
endif
# Determine arch/tune/abi/cpu options
ifneq ($(GCC_TARGET_ARCH),)
HOST_GCC_COMMON_CONF_OPTS += --with-arch="$(GCC_TARGET_ARCH)"
endif
ifneq ($(GCC_TARGET_ABI),)
HOST_GCC_COMMON_CONF_OPTS += --with-abi="$(GCC_TARGET_ABI)"
endif
ifeq ($(BR2_TOOLCHAIN_HAS_MNAN_OPTION),y)
ifneq ($(GCC_TARGET_NAN),)
HOST_GCC_COMMON_CONF_OPTS += --with-nan="$(GCC_TARGET_NAN)"
endif
endif
ifneq ($(GCC_TARGET_FP32_MODE),)
HOST_GCC_COMMON_CONF_OPTS += --with-fp-32="$(GCC_TARGET_FP32_MODE)"
endif
ifneq ($(GCC_TARGET_CPU),)
HOST_GCC_COMMON_CONF_OPTS += --with-cpu=$(GCC_TARGET_CPU)
endif
ifneq ($(GCC_TARGET_FPU),)
HOST_GCC_COMMON_CONF_OPTS += --with-fpu=$(GCC_TARGET_FPU)
endif
ifneq ($(GCC_TARGET_FLOAT_ABI),)
HOST_GCC_COMMON_CONF_OPTS += --with-float=$(GCC_TARGET_FLOAT_ABI)
endif
ifneq ($(GCC_TARGET_MODE),)
HOST_GCC_COMMON_CONF_OPTS += --with-mode=$(GCC_TARGET_MODE)
endif
# Enable proper double/long double for SPE ABI
ifeq ($(BR2_powerpc_SPE),y)
HOST_GCC_COMMON_CONF_OPTS += \
--enable-e500_double \
--with-long-double-128
endif
# PowerPC64 big endian by default uses the elfv1 ABI, and PowerPC 64
# little endian by default uses the elfv2 ABI. However, musl has
# decided to use the elfv2 ABI for both, so we force the elfv2 ABI for
# Power64 big endian when the selected C library is musl.
ifeq ($(BR2_TOOLCHAIN_USES_MUSL)$(BR2_powerpc64),yy)
HOST_GCC_COMMON_CONF_OPTS += \
--with-abi=elfv2 \
--without-long-double-128
endif
# Since glibc >= 2.26, poerpc64le requires double/long double which
# requires at least gcc 6.2.
# See sysdeps/powerpc/powerpc64le/configure.ac
ifeq ($(BR2_TOOLCHAIN_USES_GLIBC)$(BR2_TOOLCHAIN_GCC_AT_LEAST_6)$(BR2_powerpc64le),yyy)
HOST_GCC_COMMON_CONF_OPTS += \
--with-long-double-128
endif
HOST_GCC_COMMON_TOOLCHAIN_WRAPPER_ARGS += -DBR_CROSS_PATH_SUFFIX='".br_real"'
# For gcc-initial, we need to tell gcc that the C library will be
# providing the ssp support, as it can't guess it since the C library
# hasn't been built yet.
#
# For gcc-final, the gcc logic to detect whether SSP support is
# available or not in the C library is not working properly for
# uClibc, so let's be explicit as well.
HOST_GCC_COMMON_MAKE_OPTS = \
gcc_cv_libc_provides_ssp=$(if $(BR2_TOOLCHAIN_HAS_SSP),yes,no)
ifeq ($(BR2_CCACHE),y)
HOST_GCC_COMMON_CCACHE_HASH_FILES += $(GCC_DL_DIR)/$(GCC_SOURCE)
# Cfr. PATCH_BASE_DIRS in .stamp_patched, but we catch both versioned
# and unversioned patches unconditionally. Moreover, to facilitate the
# addition of gcc patches in BR2_GLOBAL_PATCH_DIR, we allow them to be
# stored in a sub-directory called 'gcc' even if it's not technically
# the name of the package.
HOST_GCC_COMMON_CCACHE_HASH_FILES += \
$(sort $(wildcard \
package/gcc/$(GCC_VERSION)/*.patch \
$(addsuffix /$($(PKG)_RAWNAME)/$(GCC_VERSION)/*.patch,$(call qstrip,$(BR2_GLOBAL_PATCH_DIR))) \
$(addsuffix /$($(PKG)_RAWNAME)/*.patch,$(call qstrip,$(BR2_GLOBAL_PATCH_DIR))) \
$(addsuffix /gcc/$(GCC_VERSION)/*.patch,$(call qstrip,$(BR2_GLOBAL_PATCH_DIR))) \
$(addsuffix /gcc/*.patch,$(call qstrip,$(BR2_GLOBAL_PATCH_DIR)))))
ifeq ($(BR2_xtensa),y)
HOST_GCC_COMMON_CCACHE_HASH_FILES += $(ARCH_XTENSA_OVERLAY_TAR)
endif
ifeq ($(ARCH),powerpc)
ifneq ($(BR2_SOFT_FLOAT),)
HOST_GCC_COMMON_CCACHE_HASH_FILES += package/gcc/$(GCC_VERSION)/1000-powerpc-link-with-math-lib.patch.conditional
endif
endif
# _CONF_OPTS contains some references to the absolute path of $(HOST_DIR)
# and a reference to the Buildroot git revision (BR2_VERSION_FULL),
# so substitute those away.
HOST_GCC_COMMON_TOOLCHAIN_WRAPPER_ARGS += -DBR_CCACHE_HASH=\"`\
printf '%s\n' $(subst $(HOST_DIR),@HOST_DIR@,\
$(subst --with-pkgversion="Buildroot $(BR2_VERSION_FULL)",,$($(PKG)_CONF_OPTS))) \
| sha256sum - $(HOST_GCC_COMMON_CCACHE_HASH_FILES) \
| cut -c -64 | tr -d '\n'`\"
endif # BR2_CCACHE
# The LTO support in gcc creates wrappers for ar, ranlib and nm which load
# the lto plugin. These wrappers are called *-gcc-ar, *-gcc-ranlib, and
# *-gcc-nm and should be used instead of the real programs when -flto is
# used. However, we should not add the toolchain wrapper for them, and they
# match the *cc-* pattern. Therefore, an additional case is added for *-ar,
# *-ranlib and *-nm.
# According to gfortran manpage, it supports all options supported by gcc, so
# add gfortran to the list of the program called via the Buildroot wrapper.
# Avoid that a .br_real is symlinked a second time.
# Also create <arch>-linux-<tool> symlinks.
define HOST_GCC_INSTALL_WRAPPER_AND_SIMPLE_SYMLINKS
$(Q)cd $(HOST_DIR)/bin; \
for i in $(GNU_TARGET_NAME)-*; do \
case "$$i" in \
*.br_real) \
;; \
*-ar|*-ranlib|*-nm) \
ln -snf $$i $(ARCH)-linux$${i##$(GNU_TARGET_NAME)}; \
;; \
*cc|*cc-*|*++|*++-*|*cpp|*-gfortran) \
rm -f $$i.br_real; \
mv $$i $$i.br_real; \
ln -sf toolchain-wrapper $$i; \
ln -sf toolchain-wrapper $(ARCH)-linux$${i##$(GNU_TARGET_NAME)}; \
ln -snf $$i.br_real $(ARCH)-linux$${i##$(GNU_TARGET_NAME)}.br_real; \
;; \
*) \
ln -snf $$i $(ARCH)-linux$${i##$(GNU_TARGET_NAME)}; \
;; \
esac; \
done
endef
include $(sort $(wildcard package/gcc/*/*.mk))
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