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