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kumquat-buildroot/toolchain/Config.in
Max Filippov 306f507f9d toolchain: add variadic MI thunk support flag 
GCC uses thunk functions to adjust the 'this' pointer when calling C++
member functions in classes derived with multiple inheritance.
Generation of thunk functions requires support from the compiler back
end. In the absence of that support target-independent code in the C++
front end is used to generate thunk functions, but it does not support
vararg functions.

Support for this feature is currently missing in or1k and xtensa
toolchains.

Add hidden option BR2_TOOLCHAIN_SUPPORTS_VARIADIC_MI_THUNK that
indicates presence of this feature in the toolchain. Add dependency to
packages that require this feature to be built.

Fixes:
http://autobuild.buildroot.net/results/c9e660c764edbd7cf0ae54ab0f0f412464721446/
http://autobuild.buildroot.net/results/9a3bf4b411c418ea78d59e35d23ba865dd453890/

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
2019-02-04 21:53:20 +01:00

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menu "Toolchain"
# Invisible option that makes sure the toolchain package always gets
# built
config BR2_TOOLCHAIN
bool
default y
# Should be selected for glibc or eglibc
config BR2_TOOLCHAIN_USES_GLIBC
bool
select BR2_USE_WCHAR
select BR2_ENABLE_LOCALE
select BR2_TOOLCHAIN_HAS_FULL_GETTEXT
select BR2_TOOLCHAIN_HAS_THREADS
select BR2_TOOLCHAIN_HAS_THREADS_DEBUG
select BR2_TOOLCHAIN_HAS_THREADS_NPTL
select BR2_TOOLCHAIN_HAS_UCONTEXT
select BR2_TOOLCHAIN_SUPPORTS_PIE
config BR2_TOOLCHAIN_USES_UCLIBC
bool
# ucontext is only available for a subset of the supported
# architectures
select BR2_TOOLCHAIN_HAS_UCONTEXT if BR2_ARM_CPU_HAS_ARM || BR2_i386 \
|| BR2_mips || BR2_mipsel || BR2_mips64 || BR2_mips64el \
|| BR2_sparc || BR2_x86_64
select BR2_TOOLCHAIN_SUPPORTS_PIE if !BR2_m68k && !BR2_microblaze && !BR2_STATIC_LIBS
config BR2_TOOLCHAIN_USES_MUSL
bool
select BR2_USE_WCHAR
select BR2_ENABLE_LOCALE
select BR2_TOOLCHAIN_HAS_THREADS
select BR2_TOOLCHAIN_HAS_THREADS_DEBUG
select BR2_TOOLCHAIN_HAS_THREADS_NPTL
select BR2_TOOLCHAIN_HAS_UCONTEXT
select BR2_TOOLCHAIN_SUPPORTS_PIE if !BR2_STATIC_LIBS
choice
prompt "Toolchain type"
help
Select whether to use the toolchain provided by buildroot
or an external toolchain.
Some vendors provide toolchains in binary form, some in
source form.
config BR2_TOOLCHAIN_BUILDROOT
bool "Buildroot toolchain"
depends on BR2_ARCH_HAS_TOOLCHAIN_BUILDROOT
config BR2_TOOLCHAIN_EXTERNAL
bool "External toolchain"
help
Select if you want to use an existing cross-compiling
toolchain. Buildroot can either download automatically a
toolchain, or use an already installed toolchain.
endchoice
source "toolchain/toolchain-buildroot/Config.in"
source "toolchain/toolchain-external/Config.in"
# Generic toolchain options
# we want gdb config in the middle of both source and external
# toolchains, but mconf won't let us source the same file twice,
# so put it here instead
source "package/gdb/Config.in.host"
comment "Toolchain Generic Options"
# https://sourceware.org/bugzilla/show_bug.cgi?id=19615
# Affect toolchains built with binutils 2.26 (fixed in binutils 2.26.1).
config BR2_TOOLCHAIN_HAS_BINUTILS_BUG_19615
bool
# https://sourceware.org/bugzilla/show_bug.cgi?id=20006
# Affect toolchains built with binutils 2.26 (fixed in binutils 2.26.1).
config BR2_TOOLCHAIN_HAS_BINUTILS_BUG_20006
bool
# Atomic types can be:
# - never lock-free
# - sometimes lock-free
# - always lock-free
# see https://en.cppreference.com/w/c/atomic/ATOMIC_LOCK_FREE_consts
#
# On most architectures, gcc provides "always lock-free" atomic types,
# but a few architectures are limited to "sometimes lock-free"
# types. This hidden option allows to know if the architecture
# provides "always lock-free" atomic types.
config BR2_TOOLCHAIN_SUPPORTS_ALWAYS_LOCKFREE_ATOMIC_INTS
bool
default y
depends on !BR2_nios2
depends on !BR2_ARM_CPU_ARMV4
depends on !BR2_ARM_CPU_ARMV5
depends on !BR2_sparc_v8
depends on !BR2_m68k_cf5208
# GCC uses thunk functions to adjust the 'this' pointer when calling
# C++ member functions in classes derived with multiple inheritance.
# Generation of thunk functions requires support from the compiler
# back end. In the absence of that support target-independent code
# in the C++ front end is used to generate thunk functions, but it
# does not support vararg functions.
# or1k will support it in the gcc mainline starting with gcc-9.
config BR2_TOOLCHAIN_SUPPORTS_VARIADIC_MI_THUNK
bool
default y
depends on !BR2_or1k
depends on !BR2_xtensa
# Prior to gcc 7.x, exception_ptr, nested_exception and future from
# libstdc++ would only be provided on architectures that support
# always lock-free atomic ints. See
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64735. This issue has
# been removed in GCC 7.x, where exception propagation is now
# supported without lock-free atomic int.
config BR2_TOOLCHAIN_HAS_GCC_BUG_64735
bool
default y if !BR2_TOOLCHAIN_SUPPORTS_ALWAYS_LOCKFREE_ATOMIC_INTS && \
!BR2_TOOLCHAIN_GCC_AT_LEAST_7
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85180. This bug no
# longer exists in gcc 8.x.
config BR2_TOOLCHAIN_HAS_GCC_BUG_85180
bool
default y if BR2_microblaze
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85862
# An infinite loop exists in the find_base_term() logic of 6.x
# on microblaze. http://autobuild.buildroot.net/results/158e8ebb39713e1b436a5cc1a1916f46c30694df/
config BR2_TOOLCHAIN_HAS_GCC_BUG_85862
bool
default y if BR2_microblaze
depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_7
config BR2_TOOLCHAIN_HAS_NATIVE_RPC
bool
config BR2_USE_WCHAR
bool
config BR2_ENABLE_LOCALE
bool
config BR2_INSTALL_LIBSTDCPP
bool
config BR2_TOOLCHAIN_HAS_FORTRAN
bool
config BR2_TOOLCHAIN_HAS_THREADS
bool
config BR2_TOOLCHAIN_HAS_THREADS_DEBUG
bool
config BR2_TOOLCHAIN_HAS_THREADS_NPTL
bool
config BR2_TOOLCHAIN_HAS_SSP
bool
config BR2_TOOLCHAIN_HAS_UCONTEXT
bool
config BR2_TOOLCHAIN_SUPPORTS_PIE
bool
config BR2_TOOLCHAIN_GLIBC_GCONV_LIBS_COPY
bool "Copy gconv libraries"
depends on BR2_TOOLCHAIN_USES_GLIBC
help
The gconv libraries are used to convert between different
character sets (charsets).
Say 'y' if you need to store and/or display different
charsets.
config BR2_TOOLCHAIN_GLIBC_GCONV_LIBS_LIST
string "Gconv libraries to copy"
depends on BR2_TOOLCHAIN_GLIBC_GCONV_LIBS_COPY
help
Set to the list of gconv libraries to copy.
Leave empty to copy all gconv libraries.
Specify only the basename of the libraries, leave
out the .so extension. Eg.:
IBM850 ISO8859-15 UNICODE
Note: the full set of gconv libs are ~8MiB (on ARM).
# This boolean is true if the toolchain provides a built-in full
# featured gettext implementation (glibc), and false if only a stub
# gettext implementation is provided (uclibc, musl)
config BR2_TOOLCHAIN_HAS_FULL_GETTEXT
bool
config BR2_USE_MMU
bool "Enable MMU support" if BR2_ARCH_HAS_MMU_OPTIONAL
default y if BR2_ARCH_HAS_MMU_OPTIONAL || BR2_ARCH_HAS_MMU_MANDATORY
help
If your target has a MMU, you should say Y here. If you
are unsure, just say Y.
config BR2_TARGET_OPTIMIZATION
string "Target Optimizations"
default ""
help
Optimizations to use when building for the target host.
NOTE: gcc optimization level is defined in build options.
config BR2_TARGET_LDFLAGS
string "Target linker options"
help
Extra options to pass to the linker when building for the
target.
Note that options with a '$' sign (eg.
-Wl,-rpath='$ORIGIN/../lib') are not supported.
config BR2_ECLIPSE_REGISTER
bool "Register toolchain within Eclipse Buildroot plug-in"
help
This options tells Buildroot to generate the necessary
configuration files to make your toolchain appear within
Eclipse, through the Eclipse Buildroot plugin.
# Options for packages to depend on, if they require at least a
# specific version of the kernel headers.
# Toolchains should choose the adequate option (ie. the highest
# version, not all of them).
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_0
bool
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_1
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_0
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_1
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_3
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_4
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_3
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_5
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_4
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_6
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_5
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_7
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_6
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_8
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_7
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_9
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_8
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_10
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_9
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_11
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_10
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_11
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_13
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_14
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_13
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_15
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_14
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_16
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_15
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_16
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_18
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_19
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_18
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_0
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_19
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_1
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_0
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_2
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_1
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_3
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_2
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_4
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_3
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_5
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_4
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_6
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_5
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_7
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_6
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_8
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_7
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_9
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_8
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_10
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_9
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_11
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_10
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_12
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_11
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_13
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_12
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_13
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_15
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_16
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_15
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_17
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_16
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_18
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_17
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_19
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_18
config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_20
bool
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_19
# This order guarantees that the highest version is set, as kconfig
# stops affecting a value on the first matching default.
config BR2_TOOLCHAIN_HEADERS_AT_LEAST
string
default "4.20" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_20
default "4.19" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_19
default "4.18" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_18
default "4.17" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_17
default "4.16" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_16
default "4.15" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_15
default "4.14" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14
default "4.13" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_13
default "4.12" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_12
default "4.11" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_11
default "4.10" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_10
default "4.9" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_9
default "4.8" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_8
default "4.7" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_7
default "4.6" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_6
default "4.5" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_5
default "4.4" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_4
default "4.3" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_3
default "4.2" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_2
default "4.1" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_1
default "4.0" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_0
default "3.19" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_19
default "3.18" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_18
default "3.17" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17
default "3.16" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_16
default "3.15" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_15
default "3.14" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_14
default "3.13" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_13
default "3.12" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12
default "3.11" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_11
default "3.10" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_10
default "3.9" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_9
default "3.8" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_8
default "3.7" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_7
default "3.6" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_6
default "3.5" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_5
default "3.4" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_4
default "3.3" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_3
default "3.2" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
default "3.1" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_1
default "3.0" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_0
default "2.6"
config BR2_TOOLCHAIN_GCC_AT_LEAST_4_3
bool
config BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
bool
select BR2_TOOLCHAIN_GCC_AT_LEAST_4_3
config BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
bool
select BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
config BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
bool
select BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
config BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
bool
select BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
config BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
bool
select BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
config BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
bool
select BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
config BR2_TOOLCHAIN_GCC_AT_LEAST_5
bool
select BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
config BR2_TOOLCHAIN_GCC_AT_LEAST_6
bool
select BR2_TOOLCHAIN_GCC_AT_LEAST_5
config BR2_TOOLCHAIN_GCC_AT_LEAST_7
bool
select BR2_TOOLCHAIN_GCC_AT_LEAST_6
config BR2_TOOLCHAIN_GCC_AT_LEAST_8
bool
select BR2_TOOLCHAIN_GCC_AT_LEAST_7
# This order guarantees that the highest version is set, as kconfig
# stops affecting a value on the first matching default.
config BR2_TOOLCHAIN_GCC_AT_LEAST
string
default "8" if BR2_TOOLCHAIN_GCC_AT_LEAST_8
default "7" if BR2_TOOLCHAIN_GCC_AT_LEAST_7
default "6" if BR2_TOOLCHAIN_GCC_AT_LEAST_6
default "5" if BR2_TOOLCHAIN_GCC_AT_LEAST_5
default "4.9" if BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
default "4.8" if BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
default "4.7" if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
default "4.6" if BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
default "4.5" if BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
default "4.4" if BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
default "4.3" if BR2_TOOLCHAIN_GCC_AT_LEAST_4_3
config BR2_TOOLCHAIN_HAS_MNAN_OPTION
bool
default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
config BR2_TOOLCHAIN_HAS_SYNC_1
bool
default y
depends on !BR2_m68k_cf
depends on !BR2_microblaze
depends on !BR2_sparc
depends on !(BR2_arc && !BR2_ARC_ATOMIC_EXT)
config BR2_TOOLCHAIN_HAS_SYNC_2
bool
default y if BR2_TOOLCHAIN_HAS_SYNC_1
config BR2_TOOLCHAIN_HAS_SYNC_4
bool
default y
depends on !BR2_m68k_cf
depends on !BR2_sparc
depends on !(BR2_arc && !BR2_ARC_ATOMIC_EXT)
# The availability of __sync for 8-byte types on ARM is somewhat
# complicated:
#
# - It appeared in gcc starting with gcc 4.7.
#
# - On ARMv7, there is no problem, it can be directly implemented in
# userspace.
#
# - On < ARMv7, it requires help from the kernel. Unfortunately, the
# libgcc code implementing 8-byte __sync with the help from the
# kernel calls __write() when a failure occurs, which is a function
# internal to glibc, not available in uClibc and musl. This means
# that the 8-byte __sync operations are not available on < ARMv7
# with uClibc and musl. This problem was fixed as part of gcc
# PR68059, which was backported to the gcc 5 branch, but isn't yet
# part of any gcc 5.x release.
#
config BR2_TOOLCHAIN_ARM_HAS_SYNC_8
bool
default y
depends on BR2_arm || BR2_armeb
depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
depends on BR2_TOOLCHAIN_USES_GLIBC || BR2_ARM_CPU_ARMV7A
# 8-byte intrinsics available on most x86 CPUs, except a few old ones
config BR2_TOOLCHAIN_X86_HAS_SYNC_8
bool
default y
depends on BR2_i386
depends on !BR2_x86_i486
depends on !BR2_x86_c3
depends on !BR2_x86_winchip_c6
depends on !BR2_x86_winchip2
# 8-byte intrinsics available:
# - On all 64 bits architecture
# - On a certain combinations of ARM platforms
# - On certain x86 32 bits CPUs
config BR2_TOOLCHAIN_HAS_SYNC_8
bool
default y if BR2_ARCH_IS_64
default y if BR2_TOOLCHAIN_ARM_HAS_SYNC_8
default y if BR2_TOOLCHAIN_X86_HAS_SYNC_8
# libatomic is available since gcc 4.8, when thread support is
# enabled. Also, libatomic doesn't recognize "uclinux" as a valid OS
# part of the tuple, and is therefore not build on uclinux targets,
# which is why BR2_BINFMT_FLAT configurations are excluded.
config BR2_TOOLCHAIN_HAS_LIBATOMIC
bool
default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 && \
BR2_TOOLCHAIN_HAS_THREADS && \
!BR2_BINFMT_FLAT
# __atomic intrinsics are available:
# - with gcc 4.8, either through built-ins or libatomic, on all
# architectures. Since we don't want to separate the cases where
# libatomic is needed vs. not needed, we simplify thing and only
# support situations where libatomic is available, even if on some
# architectures libatomic is not strictly needed as all __atomic
# intrinsics might be built-in. The only case where libatomic is
# missing entirely is when the toolchain does not have support for
# threads. However, a package that does not need threads but still
# uses atomics is quite a corner case, which does not warrant the
# added complexity.
# - with gcc 4.7, libatomic did not exist, so only built-ins are
# available. This means that __atomic can only be used in a subset
# of the architectures
config BR2_TOOLCHAIN_HAS_ATOMIC
bool
default y if BR2_TOOLCHAIN_HAS_LIBATOMIC
default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_arm
default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_armeb
default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_xtensa
default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_ARCH_IS_64
# - libquadmath is not needed/available on all architectures (but gcc
# correctly handles this already).
# - At least, libquadmath is available on:
# - i*86
# - x86_64
# - When available, libquadmath requires wchar support.
config BR2_TOOLCHAIN_HAS_LIBQUADMATH
bool
default y if BR2_i386 || BR2_x86_64
endmenu
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