gcc/config/darwin.h

   1 /* Target definitions for Darwin (Mac OS X) systems.
   2    Copyright (C) 1989-2016 Free Software Foundation, Inc.
   3    Contributed by Apple Computer Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 Under Section 7 of GPL version 3, you are granted additional
  18 permissions described in the GCC Runtime Library Exception, version
  19 3.1, as published by the Free Software Foundation.
  20
  21 You should have received a copy of the GNU General Public License and
  22 a copy of the GCC Runtime Library Exception along with this program;
  23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 <http://www.gnu.org/licenses/>.  */
  25
  26 #ifndef CONFIG_DARWIN_H
  27 #define CONFIG_DARWIN_H
  28
  29 /* The definitions in this file are common to all processor types
  30    running Darwin, which is the kernel for Mac OS X.  Darwin is
  31    basically a BSD user layer laid over a Mach kernel, then evolved
  32    for many years (at NeXT) in parallel with other Unix systems.  So
  33    while the runtime is a somewhat idiosyncratic Mach-based thing,
  34    other definitions look like they would for a BSD variant.  */
  35
  36 /* Although NeXT ran on many different architectures, as of Jan 2001
  37    the only supported Darwin targets are PowerPC and x86.  */
  38
  39 /* One of Darwin's NeXT legacies is the Mach-O format, which is partly
  40    like a.out and partly like COFF, with additional features like
  41    multi-architecture binary support.  */
  42
  43 #define DARWIN_X86 0
  44 #define DARWIN_PPC 0
  45
  46 /* Don't assume anything about the header files.  */
  47 #define NO_IMPLICIT_EXTERN_C
  48
  49 /* Suppress g++ attempt to link in the math library automatically. */
  50 #define MATH_LIBRARY ""
  51
  52 /* We have atexit.  */
  53
  54 #define HAVE_ATEXIT
  55
  56 /* Define an empty body for the function do_global_dtors() in libgcc2.c.  */
  57
  58 #define DO_GLOBAL_DTORS_BODY
  59
  60 /* The string value for __SIZE_TYPE__.  */
  61
  62 #ifndef SIZE_TYPE
  63 #define SIZE_TYPE "long unsigned int"
  64 #endif
  65
  66 /* Type used for ptrdiff_t, as a string used in a declaration.  */
  67
  68 #undef  PTRDIFF_TYPE
  69 #define PTRDIFF_TYPE "int"
  70
  71 /* wchar_t is int.  */
  72
  73 #undef  WCHAR_TYPE
  74 #define WCHAR_TYPE "int"
  75 #undef  WCHAR_TYPE_SIZE
  76 #define WCHAR_TYPE_SIZE 32
  77
  78 #define INT8_TYPE "signed char"
  79 #define INT16_TYPE "short int"
  80 #define INT32_TYPE "int"
  81 #define INT64_TYPE "long long int"
  82 #define UINT8_TYPE "unsigned char"
  83 #define UINT16_TYPE "short unsigned int"
  84 #define UINT32_TYPE "unsigned int"
  85 #define UINT64_TYPE "long long unsigned int"
  86
  87 #define INT_LEAST8_TYPE "signed char"
  88 #define INT_LEAST16_TYPE "short int"
  89 #define INT_LEAST32_TYPE "int"
  90 #define INT_LEAST64_TYPE "long long int"
  91 #define UINT_LEAST8_TYPE "unsigned char"
  92 #define UINT_LEAST16_TYPE "short unsigned int"
  93 #define UINT_LEAST32_TYPE "unsigned int"
  94 #define UINT_LEAST64_TYPE "long long unsigned int"
  95
  96 #define INT_FAST8_TYPE "signed char"
  97 #define INT_FAST16_TYPE "short int"
  98 #define INT_FAST32_TYPE "int"
  99 #define INT_FAST64_TYPE "long long int"
 100 #define UINT_FAST8_TYPE "unsigned char"
 101 #define UINT_FAST16_TYPE "short unsigned int"
 102 #define UINT_FAST32_TYPE "unsigned int"
 103 #define UINT_FAST64_TYPE "long long unsigned int"
 104
 105 #define INTPTR_TYPE "long int"
 106 #define UINTPTR_TYPE "long unsigned int"
 107
 108 #define SIG_ATOMIC_TYPE "int"
 109
 110 /* Default to using the NeXT-style runtime, since that's what is
 111    pre-installed on Darwin systems.  */
 112
 113 #define NEXT_OBJC_RUNTIME 1
 114
 115 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
 116    we want to retain compatibility with older gcc versions.  */
 117
 118 #undef  DEFAULT_PCC_STRUCT_RETURN
 119 #define DEFAULT_PCC_STRUCT_RETURN 0
 120
 121 /* True if pragma ms_struct is in effect.  */
 122 extern GTY(()) int darwin_ms_struct;
 123
 124 #define DRIVER_SELF_SPECS                                       \
 125   "%{gfull:-g -fno-eliminate-unused-debug-symbols} %<gfull",    \
 126   "%{gused:-g -feliminate-unused-debug-symbols} %<gused",       \
 127   "%{fapple-kext|mkernel:-static}",                             \
 128   "%{shared:-Zdynamiclib} %<shared"
 129
 130 #define DARWIN_CC1_SPEC                                                 \
 131   "%{findirect-virtual-calls: -fapple-kext} %<findirect-virtual-calls " \
 132   "%{fterminated-vtables: -fapple-kext} %<fterminated-vtables "         \
 133   "%<filelist* %<framework*"
 134
 135 #define SUBSUBTARGET_OVERRIDE_OPTIONS                                   \
 136   do {                                                                  \
 137     darwin_override_options ();                                         \
 138   } while (0)
 139
 140 #define SUBTARGET_C_COMMON_OVERRIDE_OPTIONS do {                        \
 141     if (flag_mkernel || flag_apple_kext)                                \
 142       {                                                                 \
 143         if (flag_use_cxa_atexit == 2)                                   \
 144           flag_use_cxa_atexit = 0;                                      \
 145         /* kexts should always be built without the coalesced sections  \
 146            because the kernel loader doesn't grok such sections.  */    \
 147         flag_weak = 0;                                                  \
 148         /* No RTTI in kexts.  */                                        \
 149         flag_rtti = 0;                                                  \
 150       }                                                                 \
 151   } while (0)
 152
 153 /* Machine dependent cpp options.  Don't add more options here, add
 154    them to darwin_cpp_builtins in darwin-c.c.  */
 155
 156 #undef  CPP_SPEC
 157 #define CPP_SPEC "%{static:%{!dynamic:-D__STATIC__}}%{!static:-D__DYNAMIC__}" \
 158         " %{pthread:-D_REENTRANT}"
 159
 160 /* This is mostly a clone of the standard LINK_COMMAND_SPEC, plus
 161    precomp, libtool, and fat build additions.
 162
 163    In general, random Darwin linker flags should go into LINK_SPEC
 164    instead of LINK_COMMAND_SPEC.  The command spec is better for
 165    specifying the handling of options understood by generic Unix
 166    linkers, and for positional arguments like libraries.  */
 167
 168 #define LINK_COMMAND_SPEC_A \
 169    "%{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
 170     %(linker)" \
 171     LINK_PLUGIN_SPEC \
 172     "%{flto*:%<fcompare-debug*} \
 173     %{flto*} \
 174     %l " LINK_COMPRESS_DEBUG_SPEC \
 175    "%X %{s} %{t} %{Z} %{u*} \
 176     %{e*} %{r} \
 177     %{o*}%{!o:-o a.out} \
 178     %{!nostdlib:%{!nostartfiles:%S}} \
 179     %{L*} %(link_libgcc) %o %{fprofile-arcs|fprofile-generate*|coverage:-lgcov} \
 180     %{fopenacc|fopenmp|%:gt(%{ftree-parallelize-loops=*:%*} 1): \
 181       %{static|static-libgcc|static-libstdc++|static-libgfortran: libgomp.a%s; : -lgomp } } \
 182     %{fcilkplus:%:include(libcilkrts.spec)%(link_cilkrts)}\
 183     %{fgnu-tm: \
 184       %{static|static-libgcc|static-libstdc++|static-libgfortran: libitm.a%s; : -litm } } \
 185     %{!nostdlib:%{!nodefaultlibs:\
 186       %{%:sanitize(address): -lasan } \
 187       %{%:sanitize(undefined): -lubsan } \
 188       %(link_ssp) %(link_gcc_c_sequence)\
 189     }}\
 190     %{!nostdlib:%{!nostartfiles:%E}} %{T*} %{F*} }}}}}}}"
 191
 192 #define DSYMUTIL "\ndsymutil"
 193
 194 #define DSYMUTIL_SPEC \
 195    "%{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
 196     %{v} \
 197     %{gdwarf-2:%{!gstabs*:%{!g0: -idsym}}}\
 198     %{.c|.cc|.C|.cpp|.cp|.c++|.cxx|.CPP|.m|.mm: \
 199     %{gdwarf-2:%{!gstabs*:%{!g0: -dsym}}}}}}}}}}}"
 200
 201 #define LINK_COMMAND_SPEC LINK_COMMAND_SPEC_A DSYMUTIL_SPEC
 202
 203 /* Tell collect2 to run dsymutil for us as necessary.  */
 204 #define COLLECT_RUN_DSYMUTIL 1
 205
 206 /* We only want one instance of %G, since libSystem (Darwin's -lc) does not depend
 207    on libgcc.  */
 208 #undef  LINK_GCC_C_SEQUENCE_SPEC
 209 #define LINK_GCC_C_SEQUENCE_SPEC "%G %L"
 210
 211 /* ld64 supports a sysroot, it just has a different name and there's no easy
 212    way to check for it at config time.  */
 213 #undef HAVE_LD_SYSROOT
 214 #define HAVE_LD_SYSROOT 1
 215 /* It seems the only (working) way to get a space after %R is to append a
 216    dangling '/'.  */
 217 #define SYSROOT_SPEC "%{!isysroot*:-syslibroot %R/ }"
 218
 219 /* Do the same as clang, for now, and insert the sysroot for ld when an
 220    isysroot is specified.  */
 221 #define LINK_SYSROOT_SPEC "%{isysroot*:-syslibroot %*}"
 222
 223 /* Suppress the addition of extra prefix paths when a sysroot is in use.  */
 224 #define STANDARD_STARTFILE_PREFIX_1 ""
 225 #define STANDARD_STARTFILE_PREFIX_2 ""
 226
 227 #define DARWIN_PIE_SPEC "%{fpie|pie|fPIE:}"
 228
 229 /* Please keep the random linker options in alphabetical order (modulo
 230    'Z' and 'no' prefixes). Note that options taking arguments may appear
 231    multiple times on a command line with different arguments each time,
 232    so put a * after their names so all of them get passed.  */
 233 #define LINK_SPEC  \
 234   "%{static}%{!static:-dynamic} \
 235    %:remove-outfile(-ldl) \
 236    %:remove-outfile(-lm) \
 237    %:remove-outfile(-lpthread) \
 238    %{fgnu-runtime: %{static|static-libgcc: \
 239                      %:replace-outfile(-lobjc libobjc-gnu.a%s); \
 240                     :%:replace-outfile(-lobjc -lobjc-gnu ) } }\
 241    %{static|static-libgcc|static-libgfortran:%:replace-outfile(-lgfortran libgfortran.a%s)}\
 242    %{static|static-libgcc|static-libstdc++|static-libgfortran:%:replace-outfile(-lgomp libgomp.a%s)}\
 243    %{static|static-libgcc|static-libstdc++:%:replace-outfile(-lstdc++ libstdc++.a%s)}\
 244    %{!Zdynamiclib: \
 245      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch) -force_cpusubtype_ALL} \
 246      %{!Zforce_cpusubtype_ALL:-arch %(darwin_subarch)} \
 247      %{Zbundle:-bundle} \
 248      %{Zbundle_loader*:-bundle_loader %*} \
 249      %{client_name*} \
 250      %{compatibility_version*:%e-compatibility_version only allowed with -dynamiclib\
 251 } \
 252      %{current_version*:%e-current_version only allowed with -dynamiclib} \
 253      %{Zforce_flat_namespace:-force_flat_namespace} \
 254      %{Zinstall_name*:%e-install_name only allowed with -dynamiclib} \
 255      %{keep_private_externs} \
 256      %{private_bundle} \
 257     } \
 258    %{Zdynamiclib: -dylib \
 259      %{Zbundle:%e-bundle not allowed with -dynamiclib} \
 260      %{Zbundle_loader*:%e-bundle_loader not allowed with -dynamiclib} \
 261      %{client_name*:%e-client_name not allowed with -dynamiclib} \
 262      %{compatibility_version*:-dylib_compatibility_version %*} \
 263      %{current_version*:-dylib_current_version %*} \
 264      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch)} \
 265      %{!Zforce_cpusubtype_ALL: -arch %(darwin_subarch)} \
 266      %{Zforce_flat_namespace:%e-force_flat_namespace not allowed with -dynamiclib} \
 267      %{Zinstall_name*:-dylib_install_name %*} \
 268      %{keep_private_externs:%e-keep_private_externs not allowed with -dynamiclib} \
 269      %{private_bundle:%e-private_bundle not allowed with -dynamiclib} \
 270     } \
 271    %{Zall_load:-all_load} \
 272    %{Zallowable_client*:-allowable_client %*} \
 273    %{Zbind_at_load:-bind_at_load} \
 274    %{Zarch_errors_fatal:-arch_errors_fatal} \
 275    %{Zdead_strip:-dead_strip} \
 276    %{Zno_dead_strip_inits_and_terms:-no_dead_strip_inits_and_terms} \
 277    %{Zdylib_file*:-dylib_file %*} \
 278    %{Zdynamic:-dynamic}\
 279    %{Zexported_symbols_list*:-exported_symbols_list %*} \
 280    %{Zflat_namespace:-flat_namespace} \
 281    %{headerpad_max_install_names} \
 282    %{Zimage_base*:-image_base %*} \
 283    %{Zinit*:-init %*} \
 284    %{mmacosx-version-min=*:-macosx_version_min %*} \
 285    %{nomultidefs} \
 286    %{Zmulti_module:-multi_module} %{Zsingle_module:-single_module} \
 287    %{Zmultiply_defined*:-multiply_defined %*} \
 288    %{!Zmultiply_defined*:%{shared-libgcc: \
 289      %:version-compare(< 10.5 mmacosx-version-min= -multiply_defined) \
 290      %:version-compare(< 10.5 mmacosx-version-min= suppress)}} \
 291    %{Zmultiplydefinedunused*:-multiply_defined_unused %*} \
 292    " DARWIN_PIE_SPEC " \
 293    %{prebind} %{noprebind} %{nofixprebinding} %{prebind_all_twolevel_modules} \
 294    %{read_only_relocs} \
 295    %{sectcreate*} %{sectorder*} %{seg1addr*} %{segprot*} \
 296    %{Zsegaddr*:-segaddr %*} \
 297    %{Zsegs_read_only_addr*:-segs_read_only_addr %*} \
 298    %{Zsegs_read_write_addr*:-segs_read_write_addr %*} \
 299    %{Zseg_addr_table*: -seg_addr_table %*} \
 300    %{Zfn_seg_addr_table_filename*:-seg_addr_table_filename %*} \
 301    %{sub_library*} %{sub_umbrella*} \
 302    " LINK_SYSROOT_SPEC " \
 303    %{twolevel_namespace} %{twolevel_namespace_hints} \
 304    %{Zumbrella*: -umbrella %*} \
 305    %{undefined*} \
 306    %{Zunexported_symbols_list*:-unexported_symbols_list %*} \
 307    %{Zweak_reference_mismatches*:-weak_reference_mismatches %*} \
 308    %{!Zweak_reference_mismatches*:-weak_reference_mismatches non-weak} \
 309    %{X} \
 310    %{y*} \
 311    %{w} \
 312    %{pagezero_size*} %{segs_read_*} %{seglinkedit} %{noseglinkedit}  \
 313    %{sectalign*} %{sectobjectsymbols*} %{segcreate*} %{whyload} \
 314    %{whatsloaded} %{dylinker_install_name*} \
 315    %{dylinker} %{Mach} "
 316
 317
 318 /* Machine dependent libraries.  */
 319
 320 #define LIB_SPEC "%{!static:-lSystem}"
 321
 322 /* Support -mmacosx-version-min by supplying different (stub) libgcc_s.dylib
 323    libraries to link against, and by not linking against libgcc_s on
 324    earlier-than-10.3.9.
 325
 326    Note that by default, -lgcc_eh is not linked against!  This is
 327    because in a future version of Darwin the EH frame information may
 328    be in a new format, or the fallback routine might be changed; if
 329    you want to explicitly link against the static version of those
 330    routines, because you know you don't need to unwind through system
 331    libraries, you need to explicitly say -static-libgcc.
 332
 333    If it is linked against, it has to be before -lgcc, because it may
 334    need symbols from -lgcc.  */
 335 #undef REAL_LIBGCC_SPEC
 336 #define REAL_LIBGCC_SPEC                                                   \
 337    "%{static-libgcc|static: -lgcc_eh -lgcc;                                \
 338       shared-libgcc|fexceptions|fgnu-runtime:                              \
 339        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4)        \
 340        %:version-compare(>< 10.5 10.6 mmacosx-version-min= -lgcc_s.10.5)   \
 341        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_ext.10.4)      \
 342        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_ext.10.5)      \
 343        -lgcc ;                                                             \
 344       :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \
 345        %:version-compare(>< 10.5 10.6 mmacosx-version-min= -lgcc_s.10.5)   \
 346        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_ext.10.4)      \
 347        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_ext.10.5)      \
 348        -lgcc }"
 349
 350 /* We specify crt0.o as -lcrt0.o so that ld will search the library path.
 351
 352    crt3.o provides __cxa_atexit on systems that don't have it.  Since
 353    it's only used with C++, which requires passing -shared-libgcc, key
 354    off that to avoid unnecessarily adding a destructor to every
 355    powerpc program built.  */
 356
 357 #undef  STARTFILE_SPEC
 358 #define STARTFILE_SPEC                                                      \
 359   "%{Zdynamiclib: %(darwin_dylib1) %{fgnu-tm: -lcrttms.o}}                  \
 360    %{!Zdynamiclib:%{Zbundle:%{!static:                                      \
 361         %:version-compare(< 10.6 mmacosx-version-min= -lbundle1.o)          \
 362         %{fgnu-tm: -lcrttms.o}}}                                            \
 363      %{!Zbundle:%{pg:%{static:-lgcrt0.o}                                    \
 364                      %{!static:%{object:-lgcrt0.o}                          \
 365                                %{!object:%{preload:-lgcrt0.o}               \
 366                                  %{!preload:-lgcrt1.o                       \
 367                                  %:version-compare(>= 10.8 mmacosx-version-min= -no_new_main) \
 368                                  %(darwin_crt2)}}}}    \
 369                 %{!pg:%{static:-lcrt0.o}                                    \
 370                       %{!static:%{object:-lcrt0.o}                          \
 371                                 %{!object:%{preload:-lcrt0.o}               \
 372                                   %{!preload: %(darwin_crt1)                \
 373                                               %(darwin_crt2)}}}}}}          \
 374   %{shared-libgcc:%:version-compare(< 10.5 mmacosx-version-min= crt3.o%s)}"
 375
 376 /* We want a destructor last in the list.  */
 377 #define TM_DESTRUCTOR "%{fgnu-tm: -lcrttme.o}"
 378 #define ENDFILE_SPEC TM_DESTRUCTOR
 379
 380 #define DARWIN_EXTRA_SPECS                                              \
 381   { "darwin_crt1", DARWIN_CRT1_SPEC },                                  \
 382   { "darwin_dylib1", DARWIN_DYLIB1_SPEC },
 383
 384 #define DARWIN_DYLIB1_SPEC                                              \
 385   "%:version-compare(!> 10.5 mmacosx-version-min= -ldylib1.o)           \
 386    %:version-compare(>< 10.5 10.6 mmacosx-version-min= -ldylib1.10.5.o)"
 387
 388 #define DARWIN_CRT1_SPEC                                                \
 389   "%:version-compare(!> 10.5 mmacosx-version-min= -lcrt1.o)             \
 390    %:version-compare(>< 10.5 10.6 mmacosx-version-min= -lcrt1.10.5.o)   \
 391    %:version-compare(>< 10.6 10.8 mmacosx-version-min= -lcrt1.10.6.o)   \
 392    %{fgnu-tm: -lcrttms.o}"
 393
 394 /* Default Darwin ASM_SPEC, very simple.  */
 395 #define ASM_SPEC "-arch %(darwin_arch) \
 396   %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL} \
 397   %{static}"
 398
 399 /* Default ASM_DEBUG_SPEC.  Darwin's as cannot currently produce dwarf
 400    debugging data.  */
 401
 402 #define ASM_DEBUG_SPEC  "%{g*:%{!g0:%{!gdwarf*:--gstabs}}}"
 403
 404 /* We still allow output of STABS if the assembler supports it.  */
 405 #ifdef HAVE_AS_STABS_DIRECTIVE
 406 #define DBX_DEBUGGING_INFO 1
 407 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 408 #endif
 409
 410 #define DWARF2_DEBUGGING_INFO 1
 411
 412 #define DEBUG_FRAME_SECTION     "__DWARF,__debug_frame,regular,debug"
 413 #define DEBUG_INFO_SECTION      "__DWARF,__debug_info,regular,debug"
 414 #define DEBUG_ABBREV_SECTION    "__DWARF,__debug_abbrev,regular,debug"
 415 #define DEBUG_ARANGES_SECTION   "__DWARF,__debug_aranges,regular,debug"
 416 #define DEBUG_MACINFO_SECTION   "__DWARF,__debug_macinfo,regular,debug"
 417 #define DEBUG_LINE_SECTION      "__DWARF,__debug_line,regular,debug"
 418 #define DEBUG_LOC_SECTION       "__DWARF,__debug_loc,regular,debug"
 419 #define DEBUG_PUBNAMES_SECTION  "__DWARF,__debug_pubnames,regular,debug"
 420 #define DEBUG_PUBTYPES_SECTION  "__DWARF,__debug_pubtypes,regular,debug"
 421 #define DEBUG_STR_SECTION       "__DWARF,__debug_str,regular,debug"
 422 #define DEBUG_RANGES_SECTION    "__DWARF,__debug_ranges,regular,debug"
 423 #define DEBUG_MACRO_SECTION    "__DWARF,__debug_macro,regular,debug"
 424
 425 #define TARGET_WANT_DEBUG_PUB_SECTIONS true
 426
 427 #define TARGET_FORCE_AT_COMP_DIR true
 428
 429 /* When generating stabs debugging, use N_BINCL entries.  */
 430
 431 #define DBX_USE_BINCL
 432
 433 /* There is no limit to the length of stabs strings.  */
 434
 435 #define DBX_CONTIN_LENGTH 0
 436
 437 /* gdb needs a null N_SO at the end of each file for scattered loading.  */
 438
 439 #define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
 440
 441 /* GCC's definition of 'one_only' is the same as its definition of 'weak'.  */
 442 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 443
 444 /* Mach-O supports 'weak imports', and 'weak definitions' in coalesced
 445    sections.  machopic_select_section ensures that weak variables go in
 446    coalesced sections.  Weak aliases (or any other kind of aliases) are
 447    not supported.  Weak symbols that aren't visible outside the .s file
 448    are not supported.  */
 449 #define ASM_WEAKEN_DECL(FILE, DECL, NAME, ALIAS)                        \
 450   do {                                                                  \
 451     if (ALIAS)                                                          \
 452       {                                                                 \
 453         warning (0, "alias definitions not supported in Mach-O; ignored");      \
 454         break;                                                          \
 455       }                                                                 \
 456                                                                         \
 457     if (! DECL_EXTERNAL (DECL) && TREE_PUBLIC (DECL))                   \
 458       targetm.asm_out.globalize_label (FILE, NAME);                     \
 459     if (DECL_EXTERNAL (DECL))                                           \
 460       fputs ("\t.weak_reference ", FILE);                               \
 461     else if (lookup_attribute ("weak_import", DECL_ATTRIBUTES (DECL)))  \
 462       break;                                                            \
 463     else if (TREE_PUBLIC (DECL))                                        \
 464       fputs ("\t.weak_definition ", FILE);                              \
 465     else                                                                \
 466       break;                                                            \
 467     assemble_name (FILE, NAME);                                         \
 468     fputc ('\n', FILE);                                                 \
 469   } while (0)
 470
 471 /* Darwin has the pthread routines in libSystem, which every program
 472    links to, so there's no need for weak-ness for that.  */
 473 #define GTHREAD_USE_WEAK 0
 474
 475 /* The Darwin linker doesn't want coalesced symbols to appear in
 476    a static archive's table of contents. */
 477 #undef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
 478 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 1
 479
 480 /* On Darwin, we don't (at the time of writing) have linkonce sections
 481    with names, so it's safe to make the class data not comdat.  */
 482 #define TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT hook_bool_void_false
 483
 484 /* For efficiency, on Darwin the RTTI information that is always
 485    emitted in the standard C++ library should not be COMDAT.  */
 486 #define TARGET_CXX_LIBRARY_RTTI_COMDAT hook_bool_void_false
 487
 488 /* We make exception information linkonce. */
 489 #undef TARGET_USES_WEAK_UNWIND_INFO
 490 #define TARGET_USES_WEAK_UNWIND_INFO 1
 491
 492 /* We need to use a nonlocal label for the start of an EH frame: the
 493    Darwin linker requires that a coalesced section start with a label.
 494    Unfortunately, it also requires that 'debug' sections don't contain
 495    labels.  */
 496 #undef FRAME_BEGIN_LABEL
 497 #define FRAME_BEGIN_LABEL (for_eh ? "EH_frame" : "Lframe")
 498
 499 /* Emit a label for the FDE corresponding to DECL.  EMPTY means
 500    emit a label for an empty FDE. */
 501 #define TARGET_ASM_EMIT_UNWIND_LABEL darwin_emit_unwind_label
 502
 503 /* Emit a label to separate the exception table.  */
 504 #define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label
 505
 506 /* Our profiling scheme doesn't LP labels and counter words.  */
 507
 508 #define NO_PROFILE_COUNTERS     1
 509
 510 #undef  INIT_SECTION_ASM_OP
 511 #define INIT_SECTION_ASM_OP ""
 512
 513 #undef  INVOKE__main
 514
 515 #define TARGET_ASM_CONSTRUCTOR  machopic_asm_out_constructor
 516 #define TARGET_ASM_DESTRUCTOR   machopic_asm_out_destructor
 517
 518 /* Always prefix with an underscore.  */
 519
 520 #define USER_LABEL_PREFIX "_"
 521
 522 /* A dummy symbol that will be replaced with the function base name.  */
 523 #define MACHOPIC_FUNCTION_BASE_NAME "<pic base>"
 524
 525 /* Don't output a .file directive.  That is only used by the assembler for
 526    error reporting.  */
 527 #undef  TARGET_ASM_FILE_START_FILE_DIRECTIVE
 528 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
 529
 530 #undef  TARGET_ASM_FILE_END
 531 #define TARGET_ASM_FILE_END darwin_file_end
 532
 533 /* Because Mach-O relocations have a counter from 1 to 255 for the
 534    section number they apply to, it is necessary to output all
 535    normal sections before the LTO sections, to make sure that the
 536    sections that may have relocations always have a section number
 537    smaller than 255.  */
 538 #undef  TARGET_ASM_LTO_START
 539 #define TARGET_ASM_LTO_START darwin_asm_lto_start
 540 #undef  TARGET_ASM_LTO_END
 541 #define TARGET_ASM_LTO_END darwin_asm_lto_end
 542
 543 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
 544   fprintf (FILE, "\t.space " HOST_WIDE_INT_PRINT_UNSIGNED"\n", SIZE)
 545
 546 /* Give ObjC methods pretty symbol names.  */
 547
 548 #undef  OBJC_GEN_METHOD_LABEL
 549 #define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \
 550   do { if (CAT_NAME)                                                    \
 551          sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+',          \
 552                   (CLASS_NAME), (CAT_NAME), (SEL_NAME));                \
 553        else                                                             \
 554          sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+',              \
 555                   (CLASS_NAME), (SEL_NAME));                            \
 556      } while (0)
 557
 558 #undef ASM_DECLARE_OBJECT_NAME
 559 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
 560         darwin_asm_declare_object_name ((FILE), (NAME), (DECL))
 561
 562 /* The RTTI data (e.g., __ti4name) is common and public (and static),
 563    but it does need to be referenced via indirect PIC data pointers.
 564    The machopic_define_symbol calls are telling the machopic subsystem
 565    that the name *is* defined in this module, so it doesn't need to
 566    make them indirect.  */
 567
 568 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 569   do {                                                                  \
 570     const char *xname = NAME;                                           \
 571     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
 572       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
 573     if (! DECL_WEAK (DECL)                                              \
 574         && ((TREE_STATIC (DECL)                                         \
 575              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
 576             || DECL_INITIAL (DECL)))                                    \
 577         machopic_define_symbol (DECL_RTL (DECL));                       \
 578     if ((TREE_STATIC (DECL)                                             \
 579          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 580         || DECL_INITIAL (DECL))                                         \
 581       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
 582     ASM_OUTPUT_FUNCTION_LABEL (FILE, xname, DECL);                      \
 583   } while (0)
 584
 585 #undef TARGET_ASM_DECLARE_CONSTANT_NAME
 586 #define TARGET_ASM_DECLARE_CONSTANT_NAME darwin_asm_declare_constant_name
 587
 588 /* Wrap new method names in quotes so the assembler doesn't gag.
 589    Make Objective-C internal symbols local and in doing this, we need
 590    to accommodate the name mangling done by c++ on file scope locals.  */
 591
 592 int darwin_label_is_anonymous_local_objc_name (const char *name);
 593
 594 #undef  ASM_OUTPUT_LABELREF
 595 #define ASM_OUTPUT_LABELREF(FILE,NAME)                                       \
 596   do {                                                                       \
 597        const char *xname = (NAME);                                           \
 598        if (! strcmp (xname, MACHOPIC_FUNCTION_BASE_NAME))                    \
 599          machopic_output_function_base_name(FILE);                           \
 600        else if (xname[0] == '&' || xname[0] == '*')                          \
 601          {                                                                   \
 602            int len = strlen (xname);                                         \
 603            if (len > 6 && !strcmp ("$stub", xname + len - 5))                \
 604              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 605            else if (len > 7 && !strcmp ("$stub\"", xname + len - 6))         \
 606              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 607            else if (len > 14 && !strcmp ("$non_lazy_ptr", xname + len - 13)) \
 608              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 609            else if (len > 15 && !strcmp ("$non_lazy_ptr\"", xname + len - 14)) \
 610              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 611            if (xname[1] != '"' && name_needs_quotes (&xname[1]))             \
 612              fprintf (FILE, "\"%s\"", &xname[1]);                            \
 613            else                                                              \
 614              fputs (&xname[1], FILE);                                        \
 615          }                                                                   \
 616        else if (xname[0] == '+' || xname[0] == '-')                          \
 617          fprintf (FILE, "\"%s\"", xname);                                    \
 618        else if (darwin_label_is_anonymous_local_objc_name (xname))           \
 619          fprintf (FILE, "L%s", xname);                                       \
 620        else if (xname[0] != '"' && name_needs_quotes (xname))                \
 621          asm_fprintf (FILE, "\"%U%s\"", xname);                              \
 622        else                                                                  \
 623          asm_fprintf (FILE, "%U%s", xname);                                  \
 624   } while (0)
 625
 626 /* Output before executable code.  */
 627 #undef TEXT_SECTION_ASM_OP
 628 #define TEXT_SECTION_ASM_OP "\t.text"
 629
 630 /* Output before writable data.  */
 631
 632 #undef DATA_SECTION_ASM_OP
 633 #define DATA_SECTION_ASM_OP "\t.data"
 634
 635 #undef  ALIGN_ASM_OP
 636 #define ALIGN_ASM_OP            ".align"
 637
 638 #undef  ASM_OUTPUT_ALIGN
 639 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 640   if ((LOG) != 0)                       \
 641     fprintf (FILE, "\t%s\t%d\n", ALIGN_ASM_OP, (LOG))
 642
 643 /* The maximum alignment which the object file format can support in
 644    bits.  For Mach-O, this is 2^15 bytes.  */
 645
 646 #undef  MAX_OFILE_ALIGNMENT
 647 #define MAX_OFILE_ALIGNMENT (0x8000 * 8)
 648
 649 #define L2_MAX_OFILE_ALIGNMENT 15
 650
 651 /*  These are the three variants that emit referenced blank space.  */
 652 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)           \
 653         darwin_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 654
 655 #undef  ASM_OUTPUT_ALIGNED_DECL_LOCAL
 656 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)    \
 657         darwin_asm_output_aligned_decl_local                            \
 658                                   ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 659
 660 #undef  ASM_OUTPUT_ALIGNED_DECL_COMMON
 661 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN)   \
 662         darwin_asm_output_aligned_decl_common                           \
 663                                    ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 664
 665 /* The generic version, archs should over-ride where required.  */
 666 #define MACHOPIC_NL_SYMBOL_PTR_SECTION ".non_lazy_symbol_pointer"
 667
 668 /* Declare the section variables.  */
 669 #ifndef USED_FOR_TARGET
 670 enum darwin_section_enum {
 671 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) NAME,
 672 #include "darwin-sections.def"
 673 #undef DEF_SECTION
 674   NUM_DARWIN_SECTIONS
 675 };
 676 extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS];
 677 #endif
 678
 679 #undef  TARGET_ASM_SELECT_SECTION
 680 #define TARGET_ASM_SELECT_SECTION machopic_select_section
 681
 682 #undef  TARGET_ASM_FUNCTION_SECTION
 683 #define TARGET_ASM_FUNCTION_SECTION darwin_function_section
 684
 685 #undef  TARGET_ASM_FUNCTION_SWITCHED_TEXT_SECTIONS
 686 #define TARGET_ASM_FUNCTION_SWITCHED_TEXT_SECTIONS \
 687         darwin_function_switched_text_sections
 688
 689 #undef  TARGET_ASM_SELECT_RTX_SECTION
 690 #define TARGET_ASM_SELECT_RTX_SECTION machopic_select_rtx_section
 691 #undef  TARGET_ASM_UNIQUE_SECTION
 692 #define TARGET_ASM_UNIQUE_SECTION darwin_unique_section
 693 #undef  TARGET_ASM_FUNCTION_RODATA_SECTION
 694 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
 695
 696 #undef  TARGET_ASM_TM_CLONE_TABLE_SECTION
 697 #define TARGET_ASM_TM_CLONE_TABLE_SECTION darwin_tm_clone_table_section
 698
 699 #undef  TARGET_ASM_RELOC_RW_MASK
 700 #define TARGET_ASM_RELOC_RW_MASK machopic_reloc_rw_mask
 701
 702 /* Globalizing directive for a label.  */
 703 #define GLOBAL_ASM_OP "\t.globl "
 704 #define TARGET_ASM_GLOBALIZE_LABEL darwin_globalize_label
 705
 706 /* Emit an assembler directive to set visibility for a symbol.  Used
 707    to support visibility attribute and Darwin's private extern
 708    feature.  */
 709 #undef TARGET_ASM_ASSEMBLE_VISIBILITY
 710 #define TARGET_ASM_ASSEMBLE_VISIBILITY darwin_assemble_visibility
 711
 712 /* Extra attributes for Darwin.  */
 713 #define SUBTARGET_ATTRIBUTE_TABLE                                            \
 714   /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler,     \
 715        affects_type_identity } */                                                    \
 716   { "apple_kext_compatibility", 0, 0, false, true, false,                    \
 717     darwin_handle_kext_attribute, false },                                   \
 718   { "weak_import", 0, 0, true, false, false,                                 \
 719     darwin_handle_weak_import_attribute, false }
 720
 721 #undef ASM_GENERATE_INTERNAL_LABEL
 722 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 723   sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM))
 724
 725 #undef TARGET_ASM_MARK_DECL_PRESERVED
 726 #define TARGET_ASM_MARK_DECL_PRESERVED darwin_mark_decl_preserved
 727
 728 /* Set on a symbol with SYMBOL_FLAG_FUNCTION or
 729    MACHO_SYMBOL_FLAG_VARIABLE to indicate that the function or
 730    variable has been defined in this translation unit.
 731    When porting Mach-O to new architectures you need to make
 732    sure these aren't clobbered by the backend.  */
 733
 734 #define MACHO_SYMBOL_FLAG_VARIABLE (SYMBOL_FLAG_MACH_DEP)
 735 #define MACHO_SYMBOL_FLAG_DEFINED ((SYMBOL_FLAG_MACH_DEP) << 1)
 736
 737 /* Set on a symbol to indicate when fix-and-continue style code
 738    generation is being used and the symbol refers to a static symbol
 739    that should be rebound from new instances of a translation unit to
 740    the original instance of the data.  */
 741
 742 #define MACHO_SYMBOL_STATIC ((SYMBOL_FLAG_MACH_DEP) << 2)
 743
 744 /* Symbolic names for various things we might know about a symbol.  */
 745
 746 enum machopic_addr_class {
 747   MACHOPIC_UNDEFINED,
 748   MACHOPIC_DEFINED_DATA,
 749   MACHOPIC_UNDEFINED_DATA,
 750   MACHOPIC_DEFINED_FUNCTION,
 751   MACHOPIC_UNDEFINED_FUNCTION
 752 };
 753
 754 /* Macros defining the various PIC cases.  */
 755
 756 #undef  MACHO_DYNAMIC_NO_PIC_P
 757 #define MACHO_DYNAMIC_NO_PIC_P  (TARGET_MACHO_DYNAMIC_NO_PIC)
 758 #undef  MACHOPIC_INDIRECT
 759 #define MACHOPIC_INDIRECT       (flag_pic || MACHO_DYNAMIC_NO_PIC_P)
 760 #define MACHOPIC_JUST_INDIRECT  (MACHO_DYNAMIC_NO_PIC_P)
 761 #undef  MACHOPIC_PURE
 762 #define MACHOPIC_PURE           (flag_pic && ! MACHO_DYNAMIC_NO_PIC_P)
 763
 764 #undef TARGET_ENCODE_SECTION_INFO
 765 #define TARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
 766 #undef TARGET_STRIP_NAME_ENCODING
 767 #define TARGET_STRIP_NAME_ENCODING  default_strip_name_encoding
 768
 769 #define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH)          \
 770   do {                                                          \
 771     const char *const stub_ = (STUB);                           \
 772     char *buffer_ = (BUF);                                      \
 773     strcpy (buffer_, stub_);                                    \
 774     if (stub_[0] == '"')                                        \
 775       {                                                         \
 776         strcpy (buffer_ + (STUB_LENGTH) - 1, "_binder\"");      \
 777       }                                                         \
 778     else                                                        \
 779       {                                                         \
 780         strcpy (buffer_ + (STUB_LENGTH), "_binder");            \
 781       }                                                         \
 782   } while (0)
 783
 784 #define GEN_SYMBOL_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)    \
 785   do {                                                          \
 786     const char *const symbol_ = (SYMBOL);                       \
 787     char *buffer_ = (BUF);                                      \
 788     if (name_needs_quotes (symbol_) && symbol_[0] != '"')       \
 789       {                                                         \
 790           sprintf (buffer_, "\"%s\"", symbol_);                 \
 791       }                                                         \
 792     else                                                        \
 793       {                                                         \
 794         strcpy (buffer_, symbol_);                              \
 795       }                                                         \
 796   } while (0)
 797
 798 /* Given a symbol name string, create the lazy pointer version
 799    of the symbol name.  */
 800
 801 #define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)  \
 802   do {                                                          \
 803     const char *symbol_ = (SYMBOL);                             \
 804     char *buffer_ = (BUF);                                      \
 805     if (symbol_[0] == '"')                                      \
 806       {                                                         \
 807         strcpy (buffer_, "\"L");                                \
 808         strcpy (buffer_ + 2, symbol_ + 1);                      \
 809         strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\"");      \
 810       }                                                         \
 811     else if (name_needs_quotes (symbol_))                       \
 812       {                                                         \
 813         strcpy (buffer_, "\"L");                                \
 814         strcpy (buffer_ + 2, symbol_);                          \
 815         strcpy (buffer_ + (SYMBOL_LENGTH) + 2, "$lazy_ptr\"");  \
 816       }                                                         \
 817     else                                                        \
 818       {                                                         \
 819         strcpy (buffer_, "L");                                  \
 820         strcpy (buffer_ + 1, symbol_);                          \
 821         strcpy (buffer_ + (SYMBOL_LENGTH) + 1, "$lazy_ptr");    \
 822       }                                                         \
 823   } while (0)
 824
 825 #define EH_FRAME_SECTION_NAME   "__TEXT"
 826 #define EH_FRAME_SECTION_ATTR ",coalesced,no_toc+strip_static_syms+live_support"
 827
 828 /* Java runtime class list.  */
 829 #define JCR_SECTION_NAME "__DATA,jcr,regular,no_dead_strip"
 830
 831 #undef ASM_PREFERRED_EH_DATA_FORMAT
 832 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  \
 833   (((CODE) == 2 && (GLOBAL) == 1) \
 834    ? (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4) : \
 835      ((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr)
 836
 837 #define ASM_OUTPUT_DWARF_DELTA(FILE,SIZE,LABEL1,LABEL2)  \
 838   darwin_asm_output_dwarf_delta (FILE, SIZE, LABEL1, LABEL2)
 839
 840 #define ASM_OUTPUT_DWARF_OFFSET(FILE,SIZE,LABEL,BASE)  \
 841   darwin_asm_output_dwarf_offset (FILE, SIZE, LABEL, BASE)
 842
 843 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(ASM_OUT_FILE, ENCODING, SIZE, ADDR, DONE)     \
 844       if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) {                            \
 845         darwin_non_lazy_pcrel (ASM_OUT_FILE, ADDR);                                     \
 846         goto DONE;                                                                      \
 847       }
 848
 849 /* Experimentally, putting jump tables in text is faster on SPEC.
 850    Also this is needed for correctness for coalesced functions.  */
 851
 852 #ifndef JUMP_TABLES_IN_TEXT_SECTION
 853 #define JUMP_TABLES_IN_TEXT_SECTION 1
 854 #endif
 855
 856 #define TARGET_TERMINATE_DW2_EH_FRAME_INFO false
 857
 858 #define TARGET_ASM_INIT_SECTIONS darwin_init_sections
 859 #undef TARGET_ASM_NAMED_SECTION
 860 #define TARGET_ASM_NAMED_SECTION darwin_asm_named_section
 861
 862 #define DARWIN_REGISTER_TARGET_PRAGMAS()                        \
 863   do {                                                          \
 864     if (!flag_preprocess_only)                                  \
 865       cpp_register_pragma (parse_in, NULL, "mark",              \
 866                            darwin_pragma_ignore, false);        \
 867     c_register_pragma (0, "options", darwin_pragma_options);    \
 868     c_register_pragma (0, "segment", darwin_pragma_ignore);     \
 869     c_register_pragma (0, "unused", darwin_pragma_unused);      \
 870     c_register_pragma (0, "ms_struct", darwin_pragma_ms_struct); \
 871   } while (0)
 872
 873 #undef ASM_APP_ON
 874 #define ASM_APP_ON ""
 875 #undef ASM_APP_OFF
 876 #define ASM_APP_OFF ""
 877
 878 void darwin_register_frameworks (const char *, const char *, int);
 879 void darwin_register_objc_includes (const char *, const char *, int);
 880 #define TARGET_EXTRA_PRE_INCLUDES darwin_register_objc_includes
 881 #define TARGET_EXTRA_INCLUDES darwin_register_frameworks
 882
 883 void add_framework_path (char *);
 884 #define TARGET_OPTF add_framework_path
 885
 886 #define TARGET_POSIX_IO
 887
 888 #define WINT_TYPE "int"
 889
 890 /* Every program on darwin links against libSystem which contains the pthread
 891    routines, so there's no need to explicitly call out when doing threaded
 892    work.  */
 893
 894 #undef GOMP_SELF_SPECS
 895 #define GOMP_SELF_SPECS ""
 896 #undef GTM_SELF_SPECS
 897 #define GTM_SELF_SPECS ""
 898
 899 /* Darwin disables section anchors by default.
 900    They should be enabled per arch where support exists in that arch.  */
 901 #define TARGET_ASM_OUTPUT_ANCHOR NULL
 902 #define DARWIN_SECTION_ANCHORS 0
 903
 904 #define HAVE_ENABLE_EXECUTE_STACK
 905
 906 /* For Apple KEXTs, we make the constructors return this to match gcc
 907    2.95.  */
 908 #define TARGET_CXX_CDTOR_RETURNS_THIS (darwin_kextabi_p)
 909 #define TARGET_KEXTABI flag_apple_kext
 910
 911 /* We have target-specific builtins.  */
 912 #define SUBTARGET_FOLD_BUILTIN darwin_fold_builtin
 913
 914 #define TARGET_N_FORMAT_TYPES 1
 915 #define TARGET_FORMAT_TYPES darwin_additional_format_types
 916
 917 #ifndef USED_FOR_TARGET
 918 extern void darwin_driver_init (unsigned int *,struct cl_decoded_option **);
 919 #define GCC_DRIVER_HOST_INITIALIZATION \
 920   darwin_driver_init (&decoded_options_count, &decoded_options)
 921 #endif
 922
 923 /* The Apple assembler and linker do not support constructor priorities.  */
 924 #undef SUPPORTS_INIT_PRIORITY
 925 #define SUPPORTS_INIT_PRIORITY 0
 926
 927 /* When building cross-compilers (and native crosses) we shall default to
 928    providing an osx-version-min of this unless overridden by the User.
 929    10.5 is the only version that fully supports all our archs so that's the
 930    fall-back default.  */
 931 #define DEF_MIN_OSX_VERSION "10.5"
 932
 933 #endif /* CONFIG_DARWIN_H */