toolchain/Config.in

   1 menu "Toolchain"
   2
   3 # Invisible option that makes sure the toolchain package always gets
   4 # built
   5 config BR2_TOOLCHAIN
   6         bool
   7         default y
   8
   9 # Should be selected for glibc or eglibc
  10 config BR2_TOOLCHAIN_USES_GLIBC
  11         bool
  12         select BR2_USE_WCHAR
  13         select BR2_ENABLE_LOCALE
  14         select BR2_TOOLCHAIN_HAS_FULL_GETTEXT
  15         select BR2_TOOLCHAIN_HAS_THREADS
  16         select BR2_TOOLCHAIN_HAS_THREADS_DEBUG
  17         select BR2_TOOLCHAIN_HAS_THREADS_NPTL
  18         select BR2_TOOLCHAIN_HAS_SHADOW_PASSWORDS
  19         select BR2_TOOLCHAIN_SUPPORTS_PIE
  20
  21 config BR2_TOOLCHAIN_USES_UCLIBC
  22         bool
  23         select BR2_TOOLCHAIN_SUPPORTS_PIE if !BR2_m68k && !BR2_microblaze && !BR2_STATIC_LIBS
  24
  25 config BR2_TOOLCHAIN_USES_MUSL
  26         bool
  27         select BR2_USE_WCHAR
  28         select BR2_ENABLE_LOCALE
  29         select BR2_TOOLCHAIN_HAS_THREADS
  30         select BR2_TOOLCHAIN_HAS_THREADS_DEBUG
  31         select BR2_TOOLCHAIN_HAS_THREADS_NPTL
  32         select BR2_TOOLCHAIN_SUPPORTS_PIE if !BR2_STATIC_LIBS
  33
  34 choice
  35         prompt "Toolchain type"
  36         help
  37           Select whether to use the toolchain provided by buildroot
  38           or an external toolchain.
  39
  40           Some vendors provide toolchains in binary form, some in
  41           source form.
  42
  43 config BR2_TOOLCHAIN_BUILDROOT
  44         bool "Buildroot toolchain"
  45         select BR2_TOOLCHAIN_HAS_SHADOW_PASSWORDS
  46         depends on BR2_ARCH_HAS_TOOLCHAIN_BUILDROOT
  47
  48 config BR2_TOOLCHAIN_EXTERNAL
  49         bool "External toolchain"
  50         help
  51           Select if you want to use an existing cross-compiling
  52           toolchain. Buildroot can either download automatically a
  53           toolchain, or use an already installed toolchain.
  54
  55 endchoice
  56
  57 source "toolchain/toolchain-buildroot/Config.in"
  58 source "toolchain/toolchain-external/Config.in"
  59
  60 # Generic toolchain options
  61
  62 # we want gdb config in the middle of both source and external
  63 # toolchains, but mconf won't let us source the same file twice,
  64 # so put it here instead
  65 source "package/gdb/Config.in.host"
  66
  67 comment "Toolchain Generic Options"
  68
  69 # https://sourceware.org/bugzilla/show_bug.cgi?id=19615
  70 # Affect toolchains built with binutils 2.26 (fixed in binutils 2.26.1).
  71 config BR2_TOOLCHAIN_HAS_BINUTILS_BUG_19615
  72         bool
  73
  74 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64735
  75 # exception_ptr, nested_exception, and future from libstdc++ are not
  76 # available for architectures not supporting always lock-free atomic
  77 # ints before GCC 7
  78 config BR2_TOOLCHAIN_HAS_GCC_BUG_64735
  79         bool
  80         default y if BR2_nios2
  81         default y if BR2_ARM_CPU_ARMV4
  82         default y if BR2_ARM_CPU_ARMV5
  83         default y if BR2_sparc_v8
  84         default y if BR2_m68k_cf5208
  85         depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_7
  86
  87 config BR2_TOOLCHAIN_HAS_NATIVE_RPC
  88         bool
  89
  90 config BR2_USE_WCHAR
  91         bool
  92
  93 config BR2_ENABLE_LOCALE
  94         bool
  95
  96 config BR2_INSTALL_LIBSTDCPP
  97         bool
  98
  99 config BR2_TOOLCHAIN_HAS_FORTRAN
 100         bool
 101
 102 config BR2_TOOLCHAIN_HAS_THREADS
 103         bool
 104
 105 config BR2_TOOLCHAIN_HAS_THREADS_DEBUG
 106         bool
 107
 108 config BR2_TOOLCHAIN_HAS_THREADS_NPTL
 109         bool
 110
 111 config BR2_TOOLCHAIN_HAS_SHADOW_PASSWORDS
 112         bool
 113
 114 config BR2_TOOLCHAIN_HAS_SSP
 115         bool
 116
 117 config BR2_TOOLCHAIN_SUPPORTS_PIE
 118         bool
 119
 120 config BR2_TOOLCHAIN_GLIBC_GCONV_LIBS_COPY
 121         bool "Copy gconv libraries"
 122         depends on BR2_TOOLCHAIN_USES_GLIBC
 123         help
 124           The gconv libraries are used to convert between different
 125           character sets (charsets).
 126
 127           Say 'y' if you need to store and/or display different charsets.
 128
 129 config BR2_TOOLCHAIN_GLIBC_GCONV_LIBS_LIST
 130         string "Gconv libraries to copy"
 131         depends on BR2_TOOLCHAIN_GLIBC_GCONV_LIBS_COPY
 132         help
 133           Set to the list of gconv libraries to copy.
 134           Leave empty to copy all gconv libraries.
 135
 136           Specify only the basename of the libraries, leave
 137           out the .so extension. Eg.:
 138             IBM850 ISO8859-15 UNICODE
 139
 140           Note: the full set of gconv libs are ~8MiB (on ARM).
 141
 142 # This boolean is true if the toolchain provides a built-in full
 143 # featured gettext implementation (glibc), and false if only a stub
 144 # gettext implementation is provided (uclibc, musl)
 145 config BR2_TOOLCHAIN_HAS_FULL_GETTEXT
 146         bool
 147
 148 config BR2_USE_MMU
 149         bool "Enable MMU support" if BR2_ARCH_HAS_MMU_OPTIONAL
 150         default y if BR2_ARCH_HAS_MMU_OPTIONAL || BR2_ARCH_HAS_MMU_MANDATORY
 151         help
 152           If your target has a MMU, you should say Y here.  If you
 153           are unsure, just say Y.
 154
 155 config BR2_TARGET_OPTIMIZATION
 156         string "Target Optimizations"
 157         default ""
 158         help
 159           Optimizations to use when building for the target host.
 160           NOTE: gcc optimization level is defined in build options.
 161
 162 config BR2_TARGET_LDFLAGS
 163         string "Target linker options"
 164         help
 165           Extra options to pass to the linker when building for the target.
 166
 167           Note that options with a '$' sign (eg. -Wl,-rpath='$ORIGIN/../lib')
 168           are not supported.
 169
 170 config BR2_ECLIPSE_REGISTER
 171         bool "Register toolchain within Eclipse Buildroot plug-in"
 172         help
 173           This options tells Buildroot to generate the necessary
 174           configuration files to make your toolchain appear within
 175           Eclipse, through the Eclipse Buildroot plugin.
 176
 177 # Options for packages to depend on, if they require at least a
 178 # specific version of the kernel headers.
 179 # Toolchains should choose the adequate option (ie. the highest
 180 # version, not all of them).
 181 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_0
 182         bool
 183
 184 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_1
 185         bool
 186         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_0
 187
 188 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
 189         bool
 190         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_1
 191
 192 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_3
 193         bool
 194         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
 195
 196 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_4
 197         bool
 198         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_3
 199
 200 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_5
 201         bool
 202         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_4
 203
 204 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_6
 205         bool
 206         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_5
 207
 208 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_7
 209         bool
 210         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_6
 211
 212 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_8
 213         bool
 214         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_7
 215
 216 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_9
 217         bool
 218         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_8
 219
 220 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_10
 221         bool
 222         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_9
 223
 224 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_11
 225         bool
 226         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_10
 227
 228 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12
 229         bool
 230         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_11
 231
 232 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_13
 233         bool
 234         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12
 235
 236 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_14
 237         bool
 238         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_13
 239
 240 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_15
 241         bool
 242         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_14
 243
 244 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_16
 245         bool
 246         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_15
 247
 248 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17
 249         bool
 250         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_16
 251
 252 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_18
 253         bool
 254         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17
 255
 256 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_19
 257         bool
 258         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_18
 259
 260 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_0
 261         bool
 262         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_19
 263
 264 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_1
 265         bool
 266         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_0
 267
 268 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_2
 269         bool
 270         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_1
 271
 272 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_3
 273         bool
 274         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_2
 275
 276 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_4
 277         bool
 278         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_3
 279
 280 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_5
 281         bool
 282         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_4
 283
 284 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_6
 285         bool
 286         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_5
 287
 288 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_7
 289         bool
 290         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_6
 291
 292 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_8
 293         bool
 294         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_7
 295
 296 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_9
 297         bool
 298         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_8
 299
 300 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_10
 301         bool
 302         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_9
 303
 304 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_11
 305         bool
 306         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_10
 307
 308 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_12
 309         bool
 310         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_11
 311
 312 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_13
 313         bool
 314         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_12
 315
 316 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14
 317         bool
 318         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_13
 319
 320 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_15
 321         bool
 322         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14
 323
 324 # This order guarantees that the highest version is set, as kconfig
 325 # stops affecting a value on the first matching default.
 326 config BR2_TOOLCHAIN_HEADERS_AT_LEAST
 327         string
 328         default "4.15" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_15
 329         default "4.14" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14
 330         default "4.13" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_13
 331         default "4.12" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_12
 332         default "4.11" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_11
 333         default "4.10" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_10
 334         default "4.9"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_9
 335         default "4.8"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_8
 336         default "4.7"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_7
 337         default "4.6"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_6
 338         default "4.5"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_5
 339         default "4.4"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_4
 340         default "4.3"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_3
 341         default "4.2"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_2
 342         default "4.1"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_1
 343         default "4.0"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_0
 344         default "3.19" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_19
 345         default "3.18" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_18
 346         default "3.17" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17
 347         default "3.16" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_16
 348         default "3.15" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_15
 349         default "3.14" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_14
 350         default "3.13" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_13
 351         default "3.12" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12
 352         default "3.11" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_11
 353         default "3.10" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_10
 354         default "3.9"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_9
 355         default "3.8"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_8
 356         default "3.7"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_7
 357         default "3.6"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_6
 358         default "3.5"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_5
 359         default "3.4"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_4
 360         default "3.3"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_3
 361         default "3.2"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
 362         default "3.1"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_1
 363         default "3.0"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_0
 364         default "2.6"
 365
 366 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_3
 367         bool
 368
 369 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
 370         bool
 371         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_3
 372
 373 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
 374         bool
 375         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
 376
 377 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
 378         bool
 379         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
 380
 381 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
 382         bool
 383         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
 384
 385 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
 386         bool
 387         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
 388
 389 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 390         bool
 391         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
 392
 393 config BR2_TOOLCHAIN_GCC_AT_LEAST_5
 394         bool
 395         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 396
 397 config BR2_TOOLCHAIN_GCC_AT_LEAST_6
 398         bool
 399         select BR2_TOOLCHAIN_GCC_AT_LEAST_5
 400
 401 config BR2_TOOLCHAIN_GCC_AT_LEAST_7
 402         bool
 403         select BR2_TOOLCHAIN_GCC_AT_LEAST_6
 404
 405 # This order guarantees that the highest version is set, as kconfig
 406 # stops affecting a value on the first matching default.
 407 config BR2_TOOLCHAIN_GCC_AT_LEAST
 408         string
 409         default "7"     if BR2_TOOLCHAIN_GCC_AT_LEAST_7
 410         default "6"     if BR2_TOOLCHAIN_GCC_AT_LEAST_6
 411         default "5"     if BR2_TOOLCHAIN_GCC_AT_LEAST_5
 412         default "4.9"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 413         default "4.8"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
 414         default "4.7"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
 415         default "4.6"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
 416         default "4.5"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
 417         default "4.4"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
 418         default "4.3"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_3
 419
 420 config BR2_TOOLCHAIN_HAS_MNAN_OPTION
 421         bool
 422         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 423
 424 config BR2_TOOLCHAIN_HAS_SYNC_1
 425         bool
 426         default y
 427         depends on !BR2_bfin
 428         depends on !BR2_m68k_cf
 429         depends on !BR2_microblaze
 430         depends on !BR2_sparc
 431         depends on !(BR2_arc && !BR2_ARC_ATOMIC_EXT)
 432
 433 config BR2_TOOLCHAIN_HAS_SYNC_2
 434         bool
 435         default y if BR2_TOOLCHAIN_HAS_SYNC_1
 436
 437 config BR2_TOOLCHAIN_HAS_SYNC_4
 438         bool
 439         default y
 440         depends on !BR2_m68k_cf
 441         depends on !BR2_sparc
 442         depends on !(BR2_arc && !BR2_ARC_ATOMIC_EXT)
 443
 444 # The availability of __sync for 8-byte types on ARM is somewhat
 445 # complicated:
 446 #
 447 #  - It appeared in gcc starting with gcc 4.7.
 448 #
 449 #  - On ARMv7, there is no problem, it can be directly implemented in
 450 #    userspace.
 451 #
 452 #  - On < ARMv7, it requires help from the kernel. Unfortunately, the
 453 #    libgcc code implementing 8-byte __sync with the help from the
 454 #    kernel calls __write() when a failure occurs, which is a function
 455 #    internal to glibc, not available in uClibc and musl. This means
 456 #    that the 8-byte __sync operations are not available on < ARMv7
 457 #    with uClibc and musl. This problem was fixed as part of gcc
 458 #    PR68059, which was backported to the gcc 5 branch, but isn't yet
 459 #    part of any gcc 5.x release.
 460 #
 461 config BR2_TOOLCHAIN_ARM_HAS_SYNC_8
 462         bool
 463         default y
 464         depends on BR2_arm || BR2_armeb
 465         depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
 466         depends on BR2_TOOLCHAIN_USES_GLIBC || BR2_ARM_CPU_ARMV7A
 467
 468 # 8-byte intrinsics available on most x86 CPUs, except a few old ones
 469 config BR2_TOOLCHAIN_X86_HAS_SYNC_8
 470         bool
 471         default y
 472         depends on BR2_i386
 473         depends on !BR2_x86_i486
 474         depends on !BR2_x86_c3
 475         depends on !BR2_x86_winchip_c6
 476         depends on !BR2_x86_winchip2
 477
 478 # 8-byte intrinsics available:
 479 #  - On all 64 bits architecture
 480 #  - On a certain combinations of ARM platforms
 481 #  - On certain x86 32 bits CPUs
 482 config BR2_TOOLCHAIN_HAS_SYNC_8
 483         bool
 484         default y if BR2_ARCH_IS_64
 485         default y if BR2_TOOLCHAIN_ARM_HAS_SYNC_8
 486         default y if BR2_TOOLCHAIN_X86_HAS_SYNC_8
 487
 488 # libatomic is available since gcc 4.8, when thread support is
 489 # enabled. Also, libatomic doesn't recognize "uclinux" as a valid OS
 490 # part of the tuple, and is therefore not build on uclinux targets,
 491 # which is why BR2_BINFMT_FLAT configurations are excluded.
 492 config BR2_TOOLCHAIN_HAS_LIBATOMIC
 493         bool
 494         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 && \
 495                 BR2_TOOLCHAIN_HAS_THREADS && \
 496                 !BR2_BINFMT_FLAT
 497
 498 # __atomic intrinsics are available:
 499 # - with gcc 4.8, either through built-ins or libatomic, on all
 500 #   architectures. Since we don't want to separate the cases where
 501 #   libatomic is needed vs. not needed, we simplify thing and only
 502 #   support situations where libatomic is available, even if on some
 503 #   architectures libatomic is not strictly needed as all __atomic
 504 #   intrinsics might be built-in. The only case where libatomic is
 505 #   missing entirely is when the toolchain does not have support for
 506 #   threads. However, a package that does not need threads but still
 507 #   uses atomics is quite a corner case, which does not warrant the
 508 #   added complexity.
 509 # - with gcc 4.7, libatomic did not exist, so only built-ins are
 510 #   available. This means that __atomic can only be used in a subset
 511 #   of the architectures
 512 config BR2_TOOLCHAIN_HAS_ATOMIC
 513         bool
 514         default y if BR2_TOOLCHAIN_HAS_LIBATOMIC
 515         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_arm
 516         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_armeb
 517         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_xtensa
 518         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_ARCH_IS_64
 519
 520 # - libquadmath is not needed/available on all architectures (but gcc
 521 #   correctly handles this already).
 522 # - At least, libquadmath is available on:
 523 #   - i*86
 524 #   - x86_64
 525 # - When available, libquadmath requires wchar support.
 526 config BR2_TOOLCHAIN_HAS_LIBQUADMATH
 527         bool
 528         default y if BR2_i386 || BR2_x86_64
 529
 530 endmenu