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_SUPPORTS_PIE
  19
  20 config BR2_TOOLCHAIN_USES_UCLIBC
  21         bool
  22         select BR2_TOOLCHAIN_SUPPORTS_PIE if !BR2_m68k && !BR2_microblaze && !BR2_STATIC_LIBS
  23
  24 config BR2_TOOLCHAIN_USES_MUSL
  25         bool
  26         select BR2_USE_WCHAR
  27         select BR2_ENABLE_LOCALE
  28         select BR2_TOOLCHAIN_HAS_THREADS
  29         select BR2_TOOLCHAIN_HAS_THREADS_DEBUG
  30         select BR2_TOOLCHAIN_HAS_THREADS_NPTL
  31         select BR2_TOOLCHAIN_SUPPORTS_PIE if !BR2_STATIC_LIBS
  32
  33 choice
  34         prompt "Toolchain type"
  35         help
  36           Select whether to use the toolchain provided by buildroot
  37           or an external toolchain.
  38
  39           Some vendors provide toolchains in binary form, some in
  40           source form.
  41
  42 config BR2_TOOLCHAIN_BUILDROOT
  43         bool "Buildroot toolchain"
  44         depends on BR2_ARCH_HAS_TOOLCHAIN_BUILDROOT
  45
  46 config BR2_TOOLCHAIN_EXTERNAL
  47         bool "External toolchain"
  48         help
  49           Select if you want to use an existing cross-compiling
  50           toolchain. Buildroot can either download automatically a
  51           toolchain, or use an already installed toolchain.
  52
  53 endchoice
  54
  55 source "toolchain/toolchain-buildroot/Config.in"
  56 source "toolchain/toolchain-external/Config.in"
  57
  58 # Generic toolchain options
  59
  60 # we want gdb config in the middle of both source and external
  61 # toolchains, but mconf won't let us source the same file twice,
  62 # so put it here instead
  63 source "package/gdb/Config.in.host"
  64
  65 comment "Toolchain Generic Options"
  66
  67 # https://sourceware.org/bugzilla/show_bug.cgi?id=19615
  68 # Affect toolchains built with binutils 2.26 (fixed in binutils 2.26.1).
  69 config BR2_TOOLCHAIN_HAS_BINUTILS_BUG_19615
  70         bool
  71
  72 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64735
  73 # exception_ptr, nested_exception, and future from libstdc++ are not
  74 # available for architectures not supporting always lock-free atomic
  75 # ints before GCC 7
  76 config BR2_TOOLCHAIN_HAS_GCC_BUG_64735
  77         bool
  78         default y if BR2_nios2
  79         default y if BR2_ARM_CPU_ARMV4
  80         default y if BR2_ARM_CPU_ARMV5
  81         default y if BR2_sparc_v8
  82         default y if BR2_m68k_cf5208
  83         depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_7
  84
  85 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85180. This bug no
  86 # longer exists in gcc 8.x.
  87 config BR2_TOOLCHAIN_HAS_GCC_BUG_85180
  88         bool
  89         default y if BR2_microblaze
  90
  91 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85862
  92 # An infinite loop exists in the find_base_term() logic of 6.x
  93 # on microblaze.  http://autobuild.buildroot.net/results/158e8ebb39713e1b436a5cc1a1916f46c30694df/
  94 config BR2_TOOLCHAIN_HAS_GCC_BUG_85862
  95         bool
  96         default y if BR2_microblaze
  97         depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_7
  98
  99 config BR2_TOOLCHAIN_HAS_NATIVE_RPC
 100         bool
 101
 102 config BR2_USE_WCHAR
 103         bool
 104
 105 config BR2_ENABLE_LOCALE
 106         bool
 107
 108 config BR2_INSTALL_LIBSTDCPP
 109         bool
 110
 111 config BR2_TOOLCHAIN_HAS_FORTRAN
 112         bool
 113
 114 config BR2_TOOLCHAIN_HAS_THREADS
 115         bool
 116
 117 config BR2_TOOLCHAIN_HAS_THREADS_DEBUG
 118         bool
 119
 120 config BR2_TOOLCHAIN_HAS_THREADS_NPTL
 121         bool
 122
 123 config BR2_TOOLCHAIN_HAS_SSP
 124         bool
 125
 126 config BR2_TOOLCHAIN_SUPPORTS_PIE
 127         bool
 128
 129 config BR2_TOOLCHAIN_GLIBC_GCONV_LIBS_COPY
 130         bool "Copy gconv libraries"
 131         depends on BR2_TOOLCHAIN_USES_GLIBC
 132         help
 133           The gconv libraries are used to convert between different
 134           character sets (charsets).
 135
 136           Say 'y' if you need to store and/or display different
 137           charsets.
 138
 139 config BR2_TOOLCHAIN_GLIBC_GCONV_LIBS_LIST
 140         string "Gconv libraries to copy"
 141         depends on BR2_TOOLCHAIN_GLIBC_GCONV_LIBS_COPY
 142         help
 143           Set to the list of gconv libraries to copy.
 144           Leave empty to copy all gconv libraries.
 145
 146           Specify only the basename of the libraries, leave
 147           out the .so extension. Eg.:
 148             IBM850 ISO8859-15 UNICODE
 149
 150           Note: the full set of gconv libs are ~8MiB (on ARM).
 151
 152 # This boolean is true if the toolchain provides a built-in full
 153 # featured gettext implementation (glibc), and false if only a stub
 154 # gettext implementation is provided (uclibc, musl)
 155 config BR2_TOOLCHAIN_HAS_FULL_GETTEXT
 156         bool
 157
 158 config BR2_USE_MMU
 159         bool "Enable MMU support" if BR2_ARCH_HAS_MMU_OPTIONAL
 160         default y if BR2_ARCH_HAS_MMU_OPTIONAL || BR2_ARCH_HAS_MMU_MANDATORY
 161         help
 162           If your target has a MMU, you should say Y here.  If you
 163           are unsure, just say Y.
 164
 165 config BR2_TARGET_OPTIMIZATION
 166         string "Target Optimizations"
 167         default ""
 168         help
 169           Optimizations to use when building for the target host.
 170           NOTE: gcc optimization level is defined in build options.
 171
 172 config BR2_TARGET_LDFLAGS
 173         string "Target linker options"
 174         help
 175           Extra options to pass to the linker when building for the
 176           target.
 177
 178           Note that options with a '$' sign (eg.
 179           -Wl,-rpath='$ORIGIN/../lib') are not supported.
 180
 181 config BR2_ECLIPSE_REGISTER
 182         bool "Register toolchain within Eclipse Buildroot plug-in"
 183         help
 184           This options tells Buildroot to generate the necessary
 185           configuration files to make your toolchain appear within
 186           Eclipse, through the Eclipse Buildroot plugin.
 187
 188 # Options for packages to depend on, if they require at least a
 189 # specific version of the kernel headers.
 190 # Toolchains should choose the adequate option (ie. the highest
 191 # version, not all of them).
 192 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_0
 193         bool
 194
 195 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_1
 196         bool
 197         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_0
 198
 199 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
 200         bool
 201         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_1
 202
 203 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_3
 204         bool
 205         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
 206
 207 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_4
 208         bool
 209         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_3
 210
 211 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_5
 212         bool
 213         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_4
 214
 215 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_6
 216         bool
 217         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_5
 218
 219 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_7
 220         bool
 221         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_6
 222
 223 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_8
 224         bool
 225         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_7
 226
 227 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_9
 228         bool
 229         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_8
 230
 231 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_10
 232         bool
 233         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_9
 234
 235 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_11
 236         bool
 237         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_10
 238
 239 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12
 240         bool
 241         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_11
 242
 243 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_13
 244         bool
 245         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12
 246
 247 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_14
 248         bool
 249         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_13
 250
 251 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_15
 252         bool
 253         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_14
 254
 255 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_16
 256         bool
 257         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_15
 258
 259 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17
 260         bool
 261         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_16
 262
 263 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_18
 264         bool
 265         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17
 266
 267 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_19
 268         bool
 269         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_18
 270
 271 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_0
 272         bool
 273         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_19
 274
 275 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_1
 276         bool
 277         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_0
 278
 279 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_2
 280         bool
 281         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_1
 282
 283 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_3
 284         bool
 285         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_2
 286
 287 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_4
 288         bool
 289         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_3
 290
 291 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_5
 292         bool
 293         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_4
 294
 295 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_6
 296         bool
 297         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_5
 298
 299 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_7
 300         bool
 301         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_6
 302
 303 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_8
 304         bool
 305         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_7
 306
 307 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_9
 308         bool
 309         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_8
 310
 311 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_10
 312         bool
 313         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_9
 314
 315 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_11
 316         bool
 317         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_10
 318
 319 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_12
 320         bool
 321         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_11
 322
 323 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_13
 324         bool
 325         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_12
 326
 327 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14
 328         bool
 329         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_13
 330
 331 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_15
 332         bool
 333         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14
 334
 335 config BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_16
 336         bool
 337         select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_15
 338
 339 # This order guarantees that the highest version is set, as kconfig
 340 # stops affecting a value on the first matching default.
 341 config BR2_TOOLCHAIN_HEADERS_AT_LEAST
 342         string
 343         default "4.16" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_16
 344         default "4.15" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_15
 345         default "4.14" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14
 346         default "4.13" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_13
 347         default "4.12" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_12
 348         default "4.11" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_11
 349         default "4.10" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_10
 350         default "4.9"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_9
 351         default "4.8"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_8
 352         default "4.7"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_7
 353         default "4.6"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_6
 354         default "4.5"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_5
 355         default "4.4"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_4
 356         default "4.3"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_3
 357         default "4.2"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_2
 358         default "4.1"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_1
 359         default "4.0"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_0
 360         default "3.19" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_19
 361         default "3.18" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_18
 362         default "3.17" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_17
 363         default "3.16" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_16
 364         default "3.15" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_15
 365         default "3.14" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_14
 366         default "3.13" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_13
 367         default "3.12" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12
 368         default "3.11" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_11
 369         default "3.10" if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_10
 370         default "3.9"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_9
 371         default "3.8"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_8
 372         default "3.7"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_7
 373         default "3.6"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_6
 374         default "3.5"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_5
 375         default "3.4"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_4
 376         default "3.3"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_3
 377         default "3.2"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
 378         default "3.1"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_1
 379         default "3.0"  if BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_0
 380         default "2.6"
 381
 382 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_3
 383         bool
 384
 385 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
 386         bool
 387         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_3
 388
 389 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
 390         bool
 391         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
 392
 393 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
 394         bool
 395         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
 396
 397 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
 398         bool
 399         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
 400
 401 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
 402         bool
 403         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
 404
 405 config BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 406         bool
 407         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
 408
 409 config BR2_TOOLCHAIN_GCC_AT_LEAST_5
 410         bool
 411         select BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 412
 413 config BR2_TOOLCHAIN_GCC_AT_LEAST_6
 414         bool
 415         select BR2_TOOLCHAIN_GCC_AT_LEAST_5
 416
 417 config BR2_TOOLCHAIN_GCC_AT_LEAST_7
 418         bool
 419         select BR2_TOOLCHAIN_GCC_AT_LEAST_6
 420
 421 config BR2_TOOLCHAIN_GCC_AT_LEAST_8
 422         bool
 423         select BR2_TOOLCHAIN_GCC_AT_LEAST_7
 424
 425 # This order guarantees that the highest version is set, as kconfig
 426 # stops affecting a value on the first matching default.
 427 config BR2_TOOLCHAIN_GCC_AT_LEAST
 428         string
 429         default "8"     if BR2_TOOLCHAIN_GCC_AT_LEAST_8
 430         default "7"     if BR2_TOOLCHAIN_GCC_AT_LEAST_7
 431         default "6"     if BR2_TOOLCHAIN_GCC_AT_LEAST_6
 432         default "5"     if BR2_TOOLCHAIN_GCC_AT_LEAST_5
 433         default "4.9"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 434         default "4.8"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
 435         default "4.7"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
 436         default "4.6"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
 437         default "4.5"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
 438         default "4.4"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
 439         default "4.3"   if BR2_TOOLCHAIN_GCC_AT_LEAST_4_3
 440
 441 config BR2_TOOLCHAIN_HAS_MNAN_OPTION
 442         bool
 443         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
 444
 445 config BR2_TOOLCHAIN_HAS_SYNC_1
 446         bool
 447         default y
 448         depends on !BR2_m68k_cf
 449         depends on !BR2_microblaze
 450         depends on !BR2_sparc
 451         depends on !(BR2_arc && !BR2_ARC_ATOMIC_EXT)
 452
 453 config BR2_TOOLCHAIN_HAS_SYNC_2
 454         bool
 455         default y if BR2_TOOLCHAIN_HAS_SYNC_1
 456
 457 config BR2_TOOLCHAIN_HAS_SYNC_4
 458         bool
 459         default y
 460         depends on !BR2_m68k_cf
 461         depends on !BR2_sparc
 462         depends on !(BR2_arc && !BR2_ARC_ATOMIC_EXT)
 463
 464 # The availability of __sync for 8-byte types on ARM is somewhat
 465 # complicated:
 466 #
 467 #  - It appeared in gcc starting with gcc 4.7.
 468 #
 469 #  - On ARMv7, there is no problem, it can be directly implemented in
 470 #    userspace.
 471 #
 472 #  - On < ARMv7, it requires help from the kernel. Unfortunately, the
 473 #    libgcc code implementing 8-byte __sync with the help from the
 474 #    kernel calls __write() when a failure occurs, which is a function
 475 #    internal to glibc, not available in uClibc and musl. This means
 476 #    that the 8-byte __sync operations are not available on < ARMv7
 477 #    with uClibc and musl. This problem was fixed as part of gcc
 478 #    PR68059, which was backported to the gcc 5 branch, but isn't yet
 479 #    part of any gcc 5.x release.
 480 #
 481 config BR2_TOOLCHAIN_ARM_HAS_SYNC_8
 482         bool
 483         default y
 484         depends on BR2_arm || BR2_armeb
 485         depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
 486         depends on BR2_TOOLCHAIN_USES_GLIBC || BR2_ARM_CPU_ARMV7A
 487
 488 # 8-byte intrinsics available on most x86 CPUs, except a few old ones
 489 config BR2_TOOLCHAIN_X86_HAS_SYNC_8
 490         bool
 491         default y
 492         depends on BR2_i386
 493         depends on !BR2_x86_i486
 494         depends on !BR2_x86_c3
 495         depends on !BR2_x86_winchip_c6
 496         depends on !BR2_x86_winchip2
 497
 498 # 8-byte intrinsics available:
 499 #  - On all 64 bits architecture
 500 #  - On a certain combinations of ARM platforms
 501 #  - On certain x86 32 bits CPUs
 502 config BR2_TOOLCHAIN_HAS_SYNC_8
 503         bool
 504         default y if BR2_ARCH_IS_64
 505         default y if BR2_TOOLCHAIN_ARM_HAS_SYNC_8
 506         default y if BR2_TOOLCHAIN_X86_HAS_SYNC_8
 507
 508 # libatomic is available since gcc 4.8, when thread support is
 509 # enabled. Also, libatomic doesn't recognize "uclinux" as a valid OS
 510 # part of the tuple, and is therefore not build on uclinux targets,
 511 # which is why BR2_BINFMT_FLAT configurations are excluded.
 512 config BR2_TOOLCHAIN_HAS_LIBATOMIC
 513         bool
 514         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 && \
 515                 BR2_TOOLCHAIN_HAS_THREADS && \
 516                 !BR2_BINFMT_FLAT
 517
 518 # __atomic intrinsics are available:
 519 # - with gcc 4.8, either through built-ins or libatomic, on all
 520 #   architectures. Since we don't want to separate the cases where
 521 #   libatomic is needed vs. not needed, we simplify thing and only
 522 #   support situations where libatomic is available, even if on some
 523 #   architectures libatomic is not strictly needed as all __atomic
 524 #   intrinsics might be built-in. The only case where libatomic is
 525 #   missing entirely is when the toolchain does not have support for
 526 #   threads. However, a package that does not need threads but still
 527 #   uses atomics is quite a corner case, which does not warrant the
 528 #   added complexity.
 529 # - with gcc 4.7, libatomic did not exist, so only built-ins are
 530 #   available. This means that __atomic can only be used in a subset
 531 #   of the architectures
 532 config BR2_TOOLCHAIN_HAS_ATOMIC
 533         bool
 534         default y if BR2_TOOLCHAIN_HAS_LIBATOMIC
 535         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_arm
 536         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_armeb
 537         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_xtensa
 538         default y if BR2_TOOLCHAIN_GCC_AT_LEAST_4_7 && BR2_ARCH_IS_64
 539
 540 # - libquadmath is not needed/available on all architectures (but gcc
 541 #   correctly handles this already).
 542 # - At least, libquadmath is available on:
 543 #   - i*86
 544 #   - x86_64
 545 # - When available, libquadmath requires wchar support.
 546 config BR2_TOOLCHAIN_HAS_LIBQUADMATH
 547         bool
 548         default y if BR2_i386 || BR2_x86_64
 549
 550 endmenu