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         depends on BR2_ARCH_HAS_TOOLCHAIN_BUILDROOT
  46         select BR2_TOOLCHAIN_HAS_SHADOW_PASSWORDS
  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
 128           charsets.
 129
 130 config BR2_TOOLCHAIN_GLIBC_GCONV_LIBS_LIST
 131         string "Gconv libraries to copy"
 132         depends on BR2_TOOLCHAIN_GLIBC_GCONV_LIBS_COPY
 133         help
 134           Set to the list of gconv libraries to copy.
 135           Leave empty to copy all gconv libraries.
 136
 137           Specify only the basename of the libraries, leave
 138           out the .so extension. Eg.:
 139             IBM850 ISO8859-15 UNICODE
 140
 141           Note: the full set of gconv libs are ~8MiB (on ARM).
 142
 143 # This boolean is true if the toolchain provides a built-in full
 144 # featured gettext implementation (glibc), and false if only a stub
 145 # gettext implementation is provided (uclibc, musl)
 146 config BR2_TOOLCHAIN_HAS_FULL_GETTEXT
 147         bool
 148
 149 config BR2_USE_MMU
 150         bool "Enable MMU support" if BR2_ARCH_HAS_MMU_OPTIONAL
 151         default y if BR2_ARCH_HAS_MMU_OPTIONAL || BR2_ARCH_HAS_MMU_MANDATORY
 152         help
 153           If your target has a MMU, you should say Y here.  If you
 154           are unsure, just say Y.
 155
 156 config BR2_TARGET_OPTIMIZATION
 157         string "Target Optimizations"
 158         default ""
 159         help
 160           Optimizations to use when building for the target host.
 161           NOTE: gcc optimization level is defined in build options.
 162
 163 config BR2_TARGET_LDFLAGS
 164         string "Target linker options"
 165         help
 166           Extra options to pass to the linker when building for the
 167           target.
 168
 169           Note that options with a '$' sign (eg.
 170           -Wl,-rpath='$ORIGIN/../lib') are not supported.
 171
 172 config BR2_ECLIPSE_REGISTER
 173         bool "Register toolchain within Eclipse Buildroot plug-in"
 174         help
 175           This options tells Buildroot to generate the necessary
 176           configuration files to make your toolchain appear within
 177           Eclipse, through the Eclipse Buildroot plugin.
 178
 179 # Options for packages to depend on, if they require at least a
 180 # specific version of the kernel headers.
 181 # Toolchains should choose the adequate option (ie. the highest
 182 # version, not all of them).
 183 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_0
 184         bool
 185
 186 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_1
 187         bool
 188         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_0
 189
 190 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
 191         bool
 192         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_1
 193
 194 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_3
 195         bool
 196         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
 197
 198 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_4
 199         bool
 200         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_3
 201
 202 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_5
 203         bool
 204         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_4
 205
 206 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_6
 207         bool
 208         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_5
 209
 210 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_7
 211         bool
 212         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_6
 213
 214 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_8
 215         bool
 216         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_7
 217
 218 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_9
 219         bool
 220         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_8
 221
 222 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_10
 223         bool
 224         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_9
 225
 226 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_11
 227         bool
 228         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_10
 229
 230 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12
 231         bool
 232         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_11
 233
 234 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_13
 235         bool
 236         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12
 237
 238 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_14
 239         bool
 240         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_13
 241
 242 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_15
 243         bool
 244         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_14
 245
 246 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_16
 247         bool
 248         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_15
 249
 250 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17
 251         bool
 252         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_16
 253
 254 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_18
 255         bool
 256         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17
 257
 258 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_19
 259         bool
 260         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_18
 261
 262 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_0
 263         bool
 264         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_19
 265
 266 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_1
 267         bool
 268         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_0
 269
 270 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_2
 271         bool
 272         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_1
 273
 274 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_3
 275         bool
 276         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_2
 277
 278 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_4
 279         bool
 280         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_3
 281
 282 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_5
 283         bool
 284         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_4
 285
 286 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_6
 287         bool
 288         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_5
 289
 290 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_7
 291         bool
 292         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_6
 293
 294 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_8
 295         bool
 296         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_7
 297
 298 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_9
 299         bool
 300         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_8
 301
 302 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_10
 303         bool
 304         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_9
 305
 306 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_11
 307         bool
 308         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_10
 309
 310 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_12
 311         bool
 312         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_11
 313
 314 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_13
 315         bool
 316         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_12
 317
 318 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14
 319         bool
 320         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_13
 321
 322 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_15
 323         bool
 324         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14
 325
 326 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_16
 327         bool
 328         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_15
 329
 330 # This order guarantees that the highest version is set, as kconfig
 331 # stops affecting a value on the first matching default.
 332 config BR2_TOOLCHAIN_HEADERS_AT_LEAST
 333         string
 334         default "4.16" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_16
 335         default "4.15" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_15
 336         default "4.14" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14
 337         default "4.13" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_13
 338         default "4.12" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_12
 339         default "4.11" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_11
 340         default "4.10" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_10
 341         default "4.9"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_9
 342         default "4.8"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_8
 343         default "4.7"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_7
 344         default "4.6"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_6
 345         default "4.5"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_5
 346         default "4.4"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_4
 347         default "4.3"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_3
 348         default "4.2"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_2
 349         default "4.1"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_1
 350         default "4.0"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_0
 351         default "3.19" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_19
 352         default "3.18" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_18
 353         default "3.17" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17
 354         default "3.16" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_16
 355         default "3.15" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_15
 356         default "3.14" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_14
 357         default "3.13" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_13
 358         default "3.12" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12
 359         default "3.11" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_11
 360         default "3.10" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_10
 361         default "3.9"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_9
 362         default "3.8"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_8
 363         default "3.7"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_7
 364         default "3.6"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_6
 365         default "3.5"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_5
 366         default "3.4"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_4
 367         default "3.3"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_3
 368         default "3.2"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
 369         default "3.1"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_1
 370         default "3.0"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_0
 371         default "2.6"
 372
 373 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_3
 374         bool
 375
 376 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
 377         bool
 378         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_3
 379
 380 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
 381         bool
 382         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
 383
 384 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
 385         bool
 386         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
 387
 388 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
 389         bool
 390         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
 391
 392 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
 393         bool
 394         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
 395
 396 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 397         bool
 398         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
 399
 400 config BR2_TOOLCHAIN_GCC_AT_LEAST_5
 401         bool
 402         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 403
 404 config BR2_TOOLCHAIN_GCC_AT_LEAST_6
 405         bool
 406         select BR2_TOOLCHAIN_GCC_AT_LEAST_5
 407
 408 config BR2_TOOLCHAIN_GCC_AT_LEAST_7
 409         bool
 410         select BR2_TOOLCHAIN_GCC_AT_LEAST_6
 411
 412 # This order guarantees that the highest version is set, as kconfig
 413 # stops affecting a value on the first matching default.
 414 config BR2_TOOLCHAIN_GCC_AT_LEAST
 415         string
 416         default "7"     if BR2_TOOLCHAIN_GCC_AT_LEAST_7
 417         default "6"     if BR2_TOOLCHAIN_GCC_AT_LEAST_6
 418         default "5"     if BR2_TOOLCHAIN_GCC_AT_LEAST_5
 419         default "4.9"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 420         default "4.8"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
 421         default "4.7"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
 422         default "4.6"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
 423         default "4.5"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
 424         default "4.4"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
 425         default "4.3"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_3
 426
 427 config BR2_TOOLCHAIN_HAS_MNAN_OPTION
 428         bool
 429         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 430
 431 config BR2_TOOLCHAIN_HAS_SYNC_1
 432         bool
 433         default y
 434         depends on !BR2_m68k_cf
 435         depends on !BR2_microblaze
 436         depends on !BR2_sparc
 437         depends on !(BR2_arc && !BR2_ARC_ATOMIC_EXT)
 438
 439 config BR2_TOOLCHAIN_HAS_SYNC_2
 440         bool
 441         default y if BR2_TOOLCHAIN_HAS_SYNC_1
 442
 443 config BR2_TOOLCHAIN_HAS_SYNC_4
 444         bool
 445         default y
 446         depends on !BR2_m68k_cf
 447         depends on !BR2_sparc
 448         depends on !(BR2_arc && !BR2_ARC_ATOMIC_EXT)
 449
 450 # The availability of __sync for 8-byte types on ARM is somewhat
 451 # complicated:
 452 #
 453 #  - It appeared in gcc starting with gcc 4.7.
 454 #
 455 #  - On ARMv7, there is no problem, it can be directly implemented in
 456 #    userspace.
 457 #
 458 #  - On < ARMv7, it requires help from the kernel. Unfortunately, the
 459 #    libgcc code implementing 8-byte __sync with the help from the
 460 #    kernel calls __write() when a failure occurs, which is a function
 461 #    internal to glibc, not available in uClibc and musl. This means
 462 #    that the 8-byte __sync operations are not available on < ARMv7
 463 #    with uClibc and musl. This problem was fixed as part of gcc
 464 #    PR68059, which was backported to the gcc 5 branch, but isn't yet
 465 #    part of any gcc 5.x release.
 466 #
 467 config BR2_TOOLCHAIN_ARM_HAS_SYNC_8
 468         bool
 469         default y
 470         depends on BR2_arm || BR2_armeb
 471         depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
 472         depends on BR2_TOOLCHAIN_USES_GLIBC || BR2_ARM_CPU_ARMV7A
 473
 474 # 8-byte intrinsics available on most x86 CPUs, except a few old ones
 475 config BR2_TOOLCHAIN_X86_HAS_SYNC_8
 476         bool
 477         default y
 478         depends on BR2_i386
 479         depends on !BR2_x86_i486
 480         depends on !BR2_x86_c3
 481         depends on !BR2_x86_winchip_c6
 482         depends on !BR2_x86_winchip2
 483
 484 # 8-byte intrinsics available:
 485 #  - On all 64 bits architecture
 486 #  - On a certain combinations of ARM platforms
 487 #  - On certain x86 32 bits CPUs
 488 config BR2_TOOLCHAIN_HAS_SYNC_8
 489         bool
 490         default y if BR2_ARCH_IS_64
 491         default y if BR2_TOOLCHAIN_ARM_HAS_SYNC_8
 492         default y if BR2_TOOLCHAIN_X86_HAS_SYNC_8
 493
 494 # libatomic is available since gcc 4.8, when thread support is
 495 # enabled. Also, libatomic doesn't recognize "uclinux" as a valid OS
 496 # part of the tuple, and is therefore not build on uclinux targets,
 497 # which is why BR2_BINFMT_FLAT configurations are excluded.
 498 config BR2_TOOLCHAIN_HAS_LIBATOMIC
 499         bool
 500         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 && \
 501                 BR2_TOOLCHAIN_HAS_THREADS && \
 502                 !BR2_BINFMT_FLAT
 503
 504 # __atomic intrinsics are available:
 505 # - with gcc 4.8, either through built-ins or libatomic, on all
 506 #   architectures. Since we don't want to separate the cases where
 507 #   libatomic is needed vs. not needed, we simplify thing and only
 508 #   support situations where libatomic is available, even if on some
 509 #   architectures libatomic is not strictly needed as all __atomic
 510 #   intrinsics might be built-in. The only case where libatomic is
 511 #   missing entirely is when the toolchain does not have support for
 512 #   threads. However, a package that does not need threads but still
 513 #   uses atomics is quite a corner case, which does not warrant the
 514 #   added complexity.
 515 # - with gcc 4.7, libatomic did not exist, so only built-ins are
 516 #   available. This means that __atomic can only be used in a subset
 517 #   of the architectures
 518 config BR2_TOOLCHAIN_HAS_ATOMIC
 519         bool
 520         default y if BR2_TOOLCHAIN_HAS_LIBATOMIC
 521         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_arm
 522         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_armeb
 523         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_xtensa
 524         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_ARCH_IS_64
 525
 526 # - libquadmath is not needed/available on all architectures (but gcc
 527 #   correctly handles this already).
 528 # - At least, libquadmath is available on:
 529 #   - i*86
 530 #   - x86_64
 531 # - When available, libquadmath requires wchar support.
 532 config BR2_TOOLCHAIN_HAS_LIBQUADMATH
 533         bool
 534         default y if BR2_i386 || BR2_x86_64
 535
 536 endmenu