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 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85862
  88 # An infinite loop exists in the find_base_term() logic of 6.x
  89 # on microblaze.  http://autobuild.buildroot.net/results/158e8ebb39713e1b436a5cc1a1916f46c30694df/
  90 config BR2_TOOLCHAIN_HAS_GCC_BUG_85862
  91         bool
  92         default y if BR2_microblaze
  93         depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_7
  94
  95 config BR2_TOOLCHAIN_HAS_NATIVE_RPC
  96         bool
  97
  98 config BR2_USE_WCHAR
  99         bool
 100
 101 config BR2_ENABLE_LOCALE
 102         bool
 103
 104 config BR2_INSTALL_LIBSTDCPP
 105         bool
 106
 107 config BR2_TOOLCHAIN_HAS_FORTRAN
 108         bool
 109
 110 config BR2_TOOLCHAIN_HAS_THREADS
 111         bool
 112
 113 config BR2_TOOLCHAIN_HAS_THREADS_DEBUG
 114         bool
 115
 116 config BR2_TOOLCHAIN_HAS_THREADS_NPTL
 117         bool
 118
 119 config BR2_TOOLCHAIN_HAS_SHADOW_PASSWORDS
 120         bool
 121
 122 config BR2_TOOLCHAIN_HAS_SSP
 123         bool
 124
 125 config BR2_TOOLCHAIN_SUPPORTS_PIE
 126         bool
 127
 128 config BR2_TOOLCHAIN_GLIBC_GCONV_LIBS_COPY
 129         bool "Copy gconv libraries"
 130         depends on BR2_TOOLCHAIN_USES_GLIBC
 131         help
 132           The gconv libraries are used to convert between different
 133           character sets (charsets).
 134
 135           Say 'y' if you need to store and/or display different
 136           charsets.
 137
 138 config BR2_TOOLCHAIN_GLIBC_GCONV_LIBS_LIST
 139         string "Gconv libraries to copy"
 140         depends on BR2_TOOLCHAIN_GLIBC_GCONV_LIBS_COPY
 141         help
 142           Set to the list of gconv libraries to copy.
 143           Leave empty to copy all gconv libraries.
 144
 145           Specify only the basename of the libraries, leave
 146           out the .so extension. Eg.:
 147             IBM850 ISO8859-15 UNICODE
 148
 149           Note: the full set of gconv libs are ~8MiB (on ARM).
 150
 151 # This boolean is true if the toolchain provides a built-in full
 152 # featured gettext implementation (glibc), and false if only a stub
 153 # gettext implementation is provided (uclibc, musl)
 154 config BR2_TOOLCHAIN_HAS_FULL_GETTEXT
 155         bool
 156
 157 config BR2_USE_MMU
 158         bool "Enable MMU support" if BR2_ARCH_HAS_MMU_OPTIONAL
 159         default y if BR2_ARCH_HAS_MMU_OPTIONAL || BR2_ARCH_HAS_MMU_MANDATORY
 160         help
 161           If your target has a MMU, you should say Y here.  If you
 162           are unsure, just say Y.
 163
 164 config BR2_TARGET_OPTIMIZATION
 165         string "Target Optimizations"
 166         default ""
 167         help
 168           Optimizations to use when building for the target host.
 169           NOTE: gcc optimization level is defined in build options.
 170
 171 config BR2_TARGET_LDFLAGS
 172         string "Target linker options"
 173         help
 174           Extra options to pass to the linker when building for the
 175           target.
 176
 177           Note that options with a '$' sign (eg.
 178           -Wl,-rpath='$ORIGIN/../lib') are not supported.
 179
 180 config BR2_ECLIPSE_REGISTER
 181         bool "Register toolchain within Eclipse Buildroot plug-in"
 182         help
 183           This options tells Buildroot to generate the necessary
 184           configuration files to make your toolchain appear within
 185           Eclipse, through the Eclipse Buildroot plugin.
 186
 187 # Options for packages to depend on, if they require at least a
 188 # specific version of the kernel headers.
 189 # Toolchains should choose the adequate option (ie. the highest
 190 # version, not all of them).
 191 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_0
 192         bool
 193
 194 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_1
 195         bool
 196         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_0
 197
 198 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
 199         bool
 200         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_1
 201
 202 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_3
 203         bool
 204         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
 205
 206 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_4
 207         bool
 208         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_3
 209
 210 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_5
 211         bool
 212         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_4
 213
 214 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_6
 215         bool
 216         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_5
 217
 218 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_7
 219         bool
 220         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_6
 221
 222 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_8
 223         bool
 224         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_7
 225
 226 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_9
 227         bool
 228         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_8
 229
 230 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_10
 231         bool
 232         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_9
 233
 234 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_11
 235         bool
 236         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_10
 237
 238 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12
 239         bool
 240         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_11
 241
 242 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_13
 243         bool
 244         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12
 245
 246 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_14
 247         bool
 248         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_13
 249
 250 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_15
 251         bool
 252         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_14
 253
 254 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_16
 255         bool
 256         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_15
 257
 258 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17
 259         bool
 260         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_16
 261
 262 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_18
 263         bool
 264         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17
 265
 266 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_19
 267         bool
 268         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_18
 269
 270 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_0
 271         bool
 272         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_19
 273
 274 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_1
 275         bool
 276         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_0
 277
 278 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_2
 279         bool
 280         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_1
 281
 282 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_3
 283         bool
 284         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_2
 285
 286 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_4
 287         bool
 288         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_3
 289
 290 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_5
 291         bool
 292         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_4
 293
 294 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_6
 295         bool
 296         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_5
 297
 298 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_7
 299         bool
 300         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_6
 301
 302 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_8
 303         bool
 304         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_7
 305
 306 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_9
 307         bool
 308         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_8
 309
 310 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_10
 311         bool
 312         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_9
 313
 314 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_11
 315         bool
 316         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_10
 317
 318 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_12
 319         bool
 320         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_11
 321
 322 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_13
 323         bool
 324         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_12
 325
 326 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14
 327         bool
 328         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_13
 329
 330 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_15
 331         bool
 332         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14
 333
 334 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_16
 335         bool
 336         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_15
 337
 338 # This order guarantees that the highest version is set, as kconfig
 339 # stops affecting a value on the first matching default.
 340 config BR2_TOOLCHAIN_HEADERS_AT_LEAST
 341         string
 342         default "4.16" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_16
 343         default "4.15" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_15
 344         default "4.14" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14
 345         default "4.13" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_13
 346         default "4.12" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_12
 347         default "4.11" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_11
 348         default "4.10" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_10
 349         default "4.9"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_9
 350         default "4.8"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_8
 351         default "4.7"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_7
 352         default "4.6"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_6
 353         default "4.5"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_5
 354         default "4.4"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_4
 355         default "4.3"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_3
 356         default "4.2"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_2
 357         default "4.1"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_1
 358         default "4.0"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_0
 359         default "3.19" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_19
 360         default "3.18" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_18
 361         default "3.17" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17
 362         default "3.16" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_16
 363         default "3.15" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_15
 364         default "3.14" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_14
 365         default "3.13" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_13
 366         default "3.12" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12
 367         default "3.11" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_11
 368         default "3.10" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_10
 369         default "3.9"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_9
 370         default "3.8"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_8
 371         default "3.7"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_7
 372         default "3.6"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_6
 373         default "3.5"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_5
 374         default "3.4"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_4
 375         default "3.3"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_3
 376         default "3.2"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
 377         default "3.1"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_1
 378         default "3.0"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_0
 379         default "2.6"
 380
 381 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_3
 382         bool
 383
 384 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
 385         bool
 386         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_3
 387
 388 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
 389         bool
 390         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
 391
 392 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
 393         bool
 394         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
 395
 396 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
 397         bool
 398         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
 399
 400 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
 401         bool
 402         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
 403
 404 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 405         bool
 406         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
 407
 408 config BR2_TOOLCHAIN_GCC_AT_LEAST_5
 409         bool
 410         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 411
 412 config BR2_TOOLCHAIN_GCC_AT_LEAST_6
 413         bool
 414         select BR2_TOOLCHAIN_GCC_AT_LEAST_5
 415
 416 config BR2_TOOLCHAIN_GCC_AT_LEAST_7
 417         bool
 418         select BR2_TOOLCHAIN_GCC_AT_LEAST_6
 419
 420 # This order guarantees that the highest version is set, as kconfig
 421 # stops affecting a value on the first matching default.
 422 config BR2_TOOLCHAIN_GCC_AT_LEAST
 423         string
 424         default "7"     if BR2_TOOLCHAIN_GCC_AT_LEAST_7
 425         default "6"     if BR2_TOOLCHAIN_GCC_AT_LEAST_6
 426         default "5"     if BR2_TOOLCHAIN_GCC_AT_LEAST_5
 427         default "4.9"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 428         default "4.8"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
 429         default "4.7"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
 430         default "4.6"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
 431         default "4.5"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
 432         default "4.4"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
 433         default "4.3"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_3
 434
 435 config BR2_TOOLCHAIN_HAS_MNAN_OPTION
 436         bool
 437         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 438
 439 config BR2_TOOLCHAIN_HAS_SYNC_1
 440         bool
 441         default y
 442         depends on !BR2_m68k_cf
 443         depends on !BR2_microblaze
 444         depends on !BR2_sparc
 445         depends on !(BR2_arc && !BR2_ARC_ATOMIC_EXT)
 446
 447 config BR2_TOOLCHAIN_HAS_SYNC_2
 448         bool
 449         default y if BR2_TOOLCHAIN_HAS_SYNC_1
 450
 451 config BR2_TOOLCHAIN_HAS_SYNC_4
 452         bool
 453         default y
 454         depends on !BR2_m68k_cf
 455         depends on !BR2_sparc
 456         depends on !(BR2_arc && !BR2_ARC_ATOMIC_EXT)
 457
 458 # The availability of __sync for 8-byte types on ARM is somewhat
 459 # complicated:
 460 #
 461 #  - It appeared in gcc starting with gcc 4.7.
 462 #
 463 #  - On ARMv7, there is no problem, it can be directly implemented in
 464 #    userspace.
 465 #
 466 #  - On < ARMv7, it requires help from the kernel. Unfortunately, the
 467 #    libgcc code implementing 8-byte __sync with the help from the
 468 #    kernel calls __write() when a failure occurs, which is a function
 469 #    internal to glibc, not available in uClibc and musl. This means
 470 #    that the 8-byte __sync operations are not available on < ARMv7
 471 #    with uClibc and musl. This problem was fixed as part of gcc
 472 #    PR68059, which was backported to the gcc 5 branch, but isn't yet
 473 #    part of any gcc 5.x release.
 474 #
 475 config BR2_TOOLCHAIN_ARM_HAS_SYNC_8
 476         bool
 477         default y
 478         depends on BR2_arm || BR2_armeb
 479         depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
 480         depends on BR2_TOOLCHAIN_USES_GLIBC || BR2_ARM_CPU_ARMV7A
 481
 482 # 8-byte intrinsics available on most x86 CPUs, except a few old ones
 483 config BR2_TOOLCHAIN_X86_HAS_SYNC_8
 484         bool
 485         default y
 486         depends on BR2_i386
 487         depends on !BR2_x86_i486
 488         depends on !BR2_x86_c3
 489         depends on !BR2_x86_winchip_c6
 490         depends on !BR2_x86_winchip2
 491
 492 # 8-byte intrinsics available:
 493 #  - On all 64 bits architecture
 494 #  - On a certain combinations of ARM platforms
 495 #  - On certain x86 32 bits CPUs
 496 config BR2_TOOLCHAIN_HAS_SYNC_8
 497         bool
 498         default y if BR2_ARCH_IS_64
 499         default y if BR2_TOOLCHAIN_ARM_HAS_SYNC_8
 500         default y if BR2_TOOLCHAIN_X86_HAS_SYNC_8
 501
 502 # libatomic is available since gcc 4.8, when thread support is
 503 # enabled. Also, libatomic doesn't recognize "uclinux" as a valid OS
 504 # part of the tuple, and is therefore not build on uclinux targets,
 505 # which is why BR2_BINFMT_FLAT configurations are excluded.
 506 config BR2_TOOLCHAIN_HAS_LIBATOMIC
 507         bool
 508         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 && \
 509                 BR2_TOOLCHAIN_HAS_THREADS && \
 510                 !BR2_BINFMT_FLAT
 511
 512 # __atomic intrinsics are available:
 513 # - with gcc 4.8, either through built-ins or libatomic, on all
 514 #   architectures. Since we don't want to separate the cases where
 515 #   libatomic is needed vs. not needed, we simplify thing and only
 516 #   support situations where libatomic is available, even if on some
 517 #   architectures libatomic is not strictly needed as all __atomic
 518 #   intrinsics might be built-in. The only case where libatomic is
 519 #   missing entirely is when the toolchain does not have support for
 520 #   threads. However, a package that does not need threads but still
 521 #   uses atomics is quite a corner case, which does not warrant the
 522 #   added complexity.
 523 # - with gcc 4.7, libatomic did not exist, so only built-ins are
 524 #   available. This means that __atomic can only be used in a subset
 525 #   of the architectures
 526 config BR2_TOOLCHAIN_HAS_ATOMIC
 527         bool
 528         default y if BR2_TOOLCHAIN_HAS_LIBATOMIC
 529         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_arm
 530         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_armeb
 531         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_xtensa
 532         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_ARCH_IS_64
 533
 534 # - libquadmath is not needed/available on all architectures (but gcc
 535 #   correctly handles this already).
 536 # - At least, libquadmath is available on:
 537 #   - i*86
 538 #   - x86_64
 539 # - When available, libquadmath requires wchar support.
 540 config BR2_TOOLCHAIN_HAS_LIBQUADMATH
 541         bool
 542         default y if BR2_i386 || BR2_x86_64
 543
 544 endmenu