gcc/config/darwin.h

   1 /* Target definitions for Darwin (Mac OS X) systems.
   2    Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002, 2003, 2004,
   3    2005, 2006, 2007, 2008, 2009, 2010
   4    Free Software Foundation, Inc.
   5    Contributed by Apple Computer Inc.
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 3, or (at your option)
  12 any later version.
  13
  14 GCC is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 Under Section 7 of GPL version 3, you are granted additional
  20 permissions described in the GCC Runtime Library Exception, version
  21 3.1, as published by the Free Software Foundation.
  22
  23 You should have received a copy of the GNU General Public License and
  24 a copy of the GCC Runtime Library Exception along with this program;
  25 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  26 <http://www.gnu.org/licenses/>.  */
  27
  28 #ifndef CONFIG_DARWIN_H
  29 #define CONFIG_DARWIN_H
  30
  31 /* The definitions in this file are common to all processor types
  32    running Darwin, which is the kernel for Mac OS X.  Darwin is
  33    basically a BSD user layer laid over a Mach kernel, then evolved
  34    for many years (at NeXT) in parallel with other Unix systems.  So
  35    while the runtime is a somewhat idiosyncratic Mach-based thing,
  36    other definitions look like they would for a BSD variant.  */
  37
  38 /* Although NeXT ran on many different architectures, as of Jan 2001
  39    the only supported Darwin targets are PowerPC and x86.  */
  40
  41 /* One of Darwin's NeXT legacies is the Mach-O format, which is partly
  42    like a.out and partly like COFF, with additional features like
  43    multi-architecture binary support.  */
  44
  45 #define DARWIN_X86 0
  46 #define DARWIN_PPC 0
  47
  48 /* Don't assume anything about the header files.  */
  49 #define NO_IMPLICIT_EXTERN_C
  50
  51 /* Suppress g++ attempt to link in the math library automatically. */
  52 #define MATH_LIBRARY ""
  53
  54 /* We have atexit.  */
  55
  56 #define HAVE_ATEXIT
  57
  58 /* Define an empty body for the function do_global_dtors() in libgcc2.c.  */
  59
  60 #define DO_GLOBAL_DTORS_BODY
  61
  62 /* The string value for __SIZE_TYPE__.  */
  63
  64 #ifndef SIZE_TYPE
  65 #define SIZE_TYPE "long unsigned int"
  66 #endif
  67
  68 /* Type used for ptrdiff_t, as a string used in a declaration.  */
  69
  70 #undef  PTRDIFF_TYPE
  71 #define PTRDIFF_TYPE "int"
  72
  73 /* wchar_t is int.  */
  74
  75 #undef  WCHAR_TYPE
  76 #define WCHAR_TYPE "int"
  77 #undef  WCHAR_TYPE_SIZE
  78 #define WCHAR_TYPE_SIZE 32
  79
  80 #define INT8_TYPE "signed char"
  81 #define INT16_TYPE "short int"
  82 #define INT32_TYPE "int"
  83 #define INT64_TYPE "long long int"
  84 #define UINT8_TYPE "unsigned char"
  85 #define UINT16_TYPE "short unsigned int"
  86 #define UINT32_TYPE "unsigned int"
  87 #define UINT64_TYPE "long long unsigned int"
  88
  89 #define INT_LEAST8_TYPE "signed char"
  90 #define INT_LEAST16_TYPE "short int"
  91 #define INT_LEAST32_TYPE "int"
  92 #define INT_LEAST64_TYPE "long long int"
  93 #define UINT_LEAST8_TYPE "unsigned char"
  94 #define UINT_LEAST16_TYPE "short unsigned int"
  95 #define UINT_LEAST32_TYPE "unsigned int"
  96 #define UINT_LEAST64_TYPE "long long unsigned int"
  97
  98 #define INT_FAST8_TYPE "signed char"
  99 #define INT_FAST16_TYPE "short int"
 100 #define INT_FAST32_TYPE "int"
 101 #define INT_FAST64_TYPE "long long int"
 102 #define UINT_FAST8_TYPE "unsigned char"
 103 #define UINT_FAST16_TYPE "short unsigned int"
 104 #define UINT_FAST32_TYPE "unsigned int"
 105 #define UINT_FAST64_TYPE "long long unsigned int"
 106
 107 #define INTPTR_TYPE "long int"
 108 #define UINTPTR_TYPE "long unsigned int"
 109
 110 #define SIG_ATOMIC_TYPE "int"
 111
 112 /* Default to using the NeXT-style runtime, since that's what is
 113    pre-installed on Darwin systems.  */
 114
 115 #define NEXT_OBJC_RUNTIME
 116
 117 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
 118    we want to retain compatibility with older gcc versions.  */
 119
 120 #undef  DEFAULT_PCC_STRUCT_RETURN
 121 #define DEFAULT_PCC_STRUCT_RETURN 0
 122
 123 /* True if pragma ms_struct is in effect.  */
 124 extern GTY(()) int darwin_ms_struct;
 125
 126 #define DRIVER_SELF_SPECS                                       \
 127   "%{gfull:-g -fno-eliminate-unused-debug-symbols} %<gfull",    \
 128   "%{gused:-g -feliminate-unused-debug-symbols} %<gused",       \
 129   "%{fapple-kext|mkernel:-static}",                             \
 130   "%{shared:-Zdynamiclib} %<shared"
 131
 132 #define DARWIN_CC1_SPEC                                                 \
 133   "%{findirect-virtual-calls: -fapple-kext} %<findirect-virtual-calls " \
 134   "%{fterminated-vtables: -fapple-kext} %<fterminated-vtables "         \
 135   "%<filelist* %<framework*"
 136
 137 #define SUBSUBTARGET_OVERRIDE_OPTIONS                                   \
 138   do {                                                                  \
 139     darwin_override_options ();                                         \
 140   } while (0)
 141
 142 #define SUBTARGET_C_COMMON_OVERRIDE_OPTIONS do {                        \
 143     if (flag_mkernel || flag_apple_kext)                                \
 144       {                                                                 \
 145         if (flag_use_cxa_atexit == 2)                                   \
 146           flag_use_cxa_atexit = 0;                                      \
 147         /* kexts should always be built without the coalesced sections  \
 148            because the kernel loader doesn't grok such sections.  */    \
 149         flag_weak = 0;                                                  \
 150         /* No RTTI in kexts.  */                                        \
 151         flag_rtti = 0;                                                  \
 152       }                                                                 \
 153   } while (0)
 154
 155 /* Machine dependent cpp options.  Don't add more options here, add
 156    them to darwin_cpp_builtins in darwin-c.c.  */
 157
 158 #undef  CPP_SPEC
 159 #define CPP_SPEC "%{static:%{!dynamic:-D__STATIC__}}%{!static:-D__DYNAMIC__}" \
 160         " %{pthread:-D_REENTRANT}"
 161
 162 /* This is mostly a clone of the standard LINK_COMMAND_SPEC, plus
 163    precomp, libtool, and fat build additions.
 164
 165    In general, random Darwin linker flags should go into LINK_SPEC
 166    instead of LINK_COMMAND_SPEC.  The command spec is better for
 167    specifying the handling of options understood by generic Unix
 168    linkers, and for positional arguments like libraries.  */
 169
 170 #define LINK_COMMAND_SPEC_A \
 171    "%{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
 172     %(linker) \
 173     %{flto*:%<fcompare-debug*} \
 174     %{flto*} \
 175     %l %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     %{fopenmp|ftree-parallelize-loops=*: \
 181       %{static|static-libgcc|static-libstdc++|static-libgfortran: libgomp.a%s; : -lgomp } } \
 182     %{!nostdlib:%{!nodefaultlibs:\
 183       %(link_ssp) %(link_gcc_c_sequence)\
 184     }}\
 185     %{!nostdlib:%{!nostartfiles:%E}} %{T*} %{F*} }}}}}}}"
 186
 187 #define DSYMUTIL "\ndsymutil"
 188
 189 #define DSYMUTIL_SPEC \
 190    "%{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
 191     %{v} \
 192     %{gdwarf-2:%{!gstabs*:%{!g0: -idsym}}}\
 193     %{.c|.cc|.C|.cpp|.cp|.c++|.cxx|.CPP|.m|.mm: \
 194     %{gdwarf-2:%{!gstabs*:%{!g0: -dsym}}}}}}}}}}}"
 195
 196 #define LINK_COMMAND_SPEC LINK_COMMAND_SPEC_A DSYMUTIL_SPEC
 197
 198 /* Tell collect2 to run dsymutil for us as necessary.  */
 199 #define COLLECT_RUN_DSYMUTIL 1
 200
 201 /* We only want one instance of %G, since libSystem (Darwin's -lc) does not depend
 202    on libgcc.  */
 203 #undef  LINK_GCC_C_SEQUENCE_SPEC
 204 #define LINK_GCC_C_SEQUENCE_SPEC "%G %L"
 205
 206 #ifdef TARGET_SYSTEM_ROOT
 207 #define LINK_SYSROOT_SPEC \
 208   "%{isysroot*:-syslibroot %*;:-syslibroot " TARGET_SYSTEM_ROOT "}"
 209 #else
 210 #define LINK_SYSROOT_SPEC "%{isysroot*:-syslibroot %*}"
 211 #endif
 212
 213 /* Please keep the random linker options in alphabetical order (modulo
 214    'Z' and 'no' prefixes). Note that options taking arguments may appear
 215    multiple times on a command line with different arguments each time,
 216    so put a * after their names so all of them get passed.  */
 217 #define LINK_SPEC  \
 218   "%{static}%{!static:-dynamic} \
 219    %:remove-outfile(-ldl) \
 220    %:remove-outfile(-lm) \
 221    %:remove-outfile(-lpthread) \
 222    %{fgnu-runtime: %{static|static-libgcc: \
 223                      %:replace-outfile(-lobjc libobjc-gnu.a%s); \
 224                     :%:replace-outfile(-lobjc -lobjc-gnu ) } }\
 225    %{static|static-libgcc|static-libgfortran:%:replace-outfile(-lgfortran libgfortran.a%s)}\
 226    %{static|static-libgcc|static-libstdc++|static-libgfortran:%:replace-outfile(-lgomp libgomp.a%s)}\
 227    %{static|static-libgcc|static-libstdc++:%:replace-outfile(-lstdc++ libstdc++.a%s)}\
 228    %{!Zdynamiclib: \
 229      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch) -force_cpusubtype_ALL} \
 230      %{!Zforce_cpusubtype_ALL:-arch %(darwin_subarch)} \
 231      %{Zbundle:-bundle} \
 232      %{Zbundle_loader*:-bundle_loader %*} \
 233      %{client_name*} \
 234      %{compatibility_version*:%e-compatibility_version only allowed with -dynamiclib\
 235 } \
 236      %{current_version*:%e-current_version only allowed with -dynamiclib} \
 237      %{Zforce_flat_namespace:-force_flat_namespace} \
 238      %{Zinstall_name*:%e-install_name only allowed with -dynamiclib} \
 239      %{keep_private_externs} \
 240      %{private_bundle} \
 241     } \
 242    %{Zdynamiclib: -dylib \
 243      %{Zbundle:%e-bundle not allowed with -dynamiclib} \
 244      %{Zbundle_loader*:%e-bundle_loader not allowed with -dynamiclib} \
 245      %{client_name*:%e-client_name not allowed with -dynamiclib} \
 246      %{compatibility_version*:-dylib_compatibility_version %*} \
 247      %{current_version*:-dylib_current_version %*} \
 248      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch)} \
 249      %{!Zforce_cpusubtype_ALL: -arch %(darwin_subarch)} \
 250      %{Zforce_flat_namespace:%e-force_flat_namespace not allowed with -dynamiclib} \
 251      %{Zinstall_name*:-dylib_install_name %*} \
 252      %{keep_private_externs:%e-keep_private_externs not allowed with -dynamiclib} \
 253      %{private_bundle:%e-private_bundle not allowed with -dynamiclib} \
 254     } \
 255    %{Zall_load:-all_load} \
 256    %{Zallowable_client*:-allowable_client %*} \
 257    %{Zbind_at_load:-bind_at_load} \
 258    %{Zarch_errors_fatal:-arch_errors_fatal} \
 259    %{Zdead_strip:-dead_strip} \
 260    %{Zno_dead_strip_inits_and_terms:-no_dead_strip_inits_and_terms} \
 261    %{Zdylib_file*:-dylib_file %*} \
 262    %{Zdynamic:-dynamic}\
 263    %{Zexported_symbols_list*:-exported_symbols_list %*} \
 264    %{Zflat_namespace:-flat_namespace} \
 265    %{headerpad_max_install_names} \
 266    %{Zimage_base*:-image_base %*} \
 267    %{Zinit*:-init %*} \
 268    %{!mmacosx-version-min=*:-macosx_version_min %(darwin_minversion)} \
 269    %{mmacosx-version-min=*:-macosx_version_min %*} \
 270    %{nomultidefs} \
 271    %{Zmulti_module:-multi_module} %{Zsingle_module:-single_module} \
 272    %{Zmultiply_defined*:-multiply_defined %*} \
 273    %{!Zmultiply_defined*:%{shared-libgcc: \
 274      %:version-compare(< 10.5 mmacosx-version-min= -multiply_defined) \
 275      %:version-compare(< 10.5 mmacosx-version-min= suppress)}} \
 276    %{Zmultiplydefinedunused*:-multiply_defined_unused %*} \
 277    %{fpie:-pie} \
 278    %{prebind} %{noprebind} %{nofixprebinding} %{prebind_all_twolevel_modules} \
 279    %{read_only_relocs} \
 280    %{sectcreate*} %{sectorder*} %{seg1addr*} %{segprot*} \
 281    %{Zsegaddr*:-segaddr %*} \
 282    %{Zsegs_read_only_addr*:-segs_read_only_addr %*} \
 283    %{Zsegs_read_write_addr*:-segs_read_write_addr %*} \
 284    %{Zseg_addr_table*: -seg_addr_table %*} \
 285    %{Zfn_seg_addr_table_filename*:-seg_addr_table_filename %*} \
 286    %{sub_library*} %{sub_umbrella*} \
 287    " LINK_SYSROOT_SPEC " \
 288    %{twolevel_namespace} %{twolevel_namespace_hints} \
 289    %{Zumbrella*: -umbrella %*} \
 290    %{undefined*} \
 291    %{Zunexported_symbols_list*:-unexported_symbols_list %*} \
 292    %{Zweak_reference_mismatches*:-weak_reference_mismatches %*} \
 293    %{!Zweak_reference_mismatches*:-weak_reference_mismatches non-weak} \
 294    %{X} \
 295    %{y*} \
 296    %{w} \
 297    %{pagezero_size*} %{segs_read_*} %{seglinkedit} %{noseglinkedit}  \
 298    %{sectalign*} %{sectobjectsymbols*} %{segcreate*} %{whyload} \
 299    %{whatsloaded} %{dylinker_install_name*} \
 300    %{dylinker} %{Mach} "
 301
 302
 303 /* Machine dependent libraries.  */
 304
 305 #define LIB_SPEC "%{!static:-lSystem}"
 306
 307 /* Support -mmacosx-version-min by supplying different (stub) libgcc_s.dylib
 308    libraries to link against, and by not linking against libgcc_s on
 309    earlier-than-10.3.9.
 310
 311    Note that by default, -lgcc_eh is not linked against!  This is
 312    because in a future version of Darwin the EH frame information may
 313    be in a new format, or the fallback routine might be changed; if
 314    you want to explicitly link against the static version of those
 315    routines, because you know you don't need to unwind through system
 316    libraries, you need to explicitly say -static-libgcc.
 317
 318    If it is linked against, it has to be before -lgcc, because it may
 319    need symbols from -lgcc.  */
 320 #undef REAL_LIBGCC_SPEC
 321 #define REAL_LIBGCC_SPEC                                                   \
 322    "%{static-libgcc|static: -lgcc_eh -lgcc;                                \
 323       shared-libgcc|fexceptions|fgnu-runtime:                              \
 324        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4)        \
 325        %:version-compare(>< 10.5 10.6 mmacosx-version-min= -lgcc_s.10.5)   \
 326        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_ext.10.4)      \
 327        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_ext.10.5)      \
 328        -lgcc ;                                                             \
 329       :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \
 330        %:version-compare(>< 10.5 10.6 mmacosx-version-min= -lgcc_s.10.5)   \
 331        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_ext.10.4)      \
 332        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_ext.10.5)      \
 333        -lgcc }"
 334
 335 /* We specify crt0.o as -lcrt0.o so that ld will search the library path.
 336
 337    crt3.o provides __cxa_atexit on systems that don't have it.  Since
 338    it's only used with C++, which requires passing -shared-libgcc, key
 339    off that to avoid unnecessarily adding a destructor to every
 340    powerpc program built.  */
 341
 342 #undef  STARTFILE_SPEC
 343 #define STARTFILE_SPEC                                                      \
 344   "%{Zdynamiclib: %(darwin_dylib1) }                                        \
 345    %{!Zdynamiclib:%{Zbundle:%{!static:-lbundle1.o}}                         \
 346      %{!Zbundle:%{pg:%{static:-lgcrt0.o}                                    \
 347                      %{!static:%{object:-lgcrt0.o}                          \
 348                                %{!object:%{preload:-lgcrt0.o}               \
 349                                  %{!preload:-lgcrt1.o %(darwin_crt2)}}}}    \
 350                 %{!pg:%{static:-lcrt0.o}                                    \
 351                       %{!static:%{object:-lcrt0.o}                          \
 352                                 %{!object:%{preload:-lcrt0.o}               \
 353                                   %{!preload: %(darwin_crt1)                \
 354                                               %(darwin_crt2)}}}}}}          \
 355   %{shared-libgcc:%:version-compare(< 10.5 mmacosx-version-min= crt3.o%s)}"
 356
 357 /* The native Darwin linker doesn't necessarily place files in the order
 358    that they're specified on the link line.  Thus, it is pointless
 359    to put anything in ENDFILE_SPEC.  */
 360 /* #define ENDFILE_SPEC "" */
 361
 362 #define DARWIN_EXTRA_SPECS                                              \
 363   { "darwin_crt1", DARWIN_CRT1_SPEC },                                  \
 364   { "darwin_dylib1", DARWIN_DYLIB1_SPEC },                              \
 365   { "darwin_minversion", DARWIN_MINVERSION_SPEC },
 366
 367 #define DARWIN_DYLIB1_SPEC                                              \
 368   "%:version-compare(!> 10.5 mmacosx-version-min= -ldylib1.o)           \
 369    %:version-compare(>= 10.5 mmacosx-version-min= -ldylib1.10.5.o)"
 370
 371 #define DARWIN_CRT1_SPEC                                                \
 372   "%:version-compare(!> 10.5 mmacosx-version-min= -lcrt1.o)             \
 373    %:version-compare(>= 10.5 mmacosx-version-min= -lcrt1.10.5.o)"
 374
 375 /* Default Darwin ASM_SPEC, very simple.  */
 376 #define ASM_SPEC "-arch %(darwin_arch) \
 377   %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL} \
 378   %{static}"
 379
 380 /* We still allow output of STABS.  */
 381
 382 #define DBX_DEBUGGING_INFO 1
 383
 384 #define DWARF2_DEBUGGING_INFO 1
 385 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 386
 387 #define DEBUG_FRAME_SECTION     "__DWARF,__debug_frame,regular,debug"
 388 #define DEBUG_INFO_SECTION      "__DWARF,__debug_info,regular,debug"
 389 #define DEBUG_ABBREV_SECTION    "__DWARF,__debug_abbrev,regular,debug"
 390 #define DEBUG_ARANGES_SECTION   "__DWARF,__debug_aranges,regular,debug"
 391 #define DEBUG_MACINFO_SECTION   "__DWARF,__debug_macinfo,regular,debug"
 392 #define DEBUG_LINE_SECTION      "__DWARF,__debug_line,regular,debug"
 393 #define DEBUG_LOC_SECTION       "__DWARF,__debug_loc,regular,debug"
 394 #define DEBUG_PUBNAMES_SECTION  "__DWARF,__debug_pubnames,regular,debug"
 395 #define DEBUG_PUBTYPES_SECTION  "__DWARF,__debug_pubtypes,regular,debug"
 396 #define DEBUG_STR_SECTION       "__DWARF,__debug_str,regular,debug"
 397 #define DEBUG_RANGES_SECTION    "__DWARF,__debug_ranges,regular,debug"
 398
 399 #define TARGET_WANT_DEBUG_PUB_SECTIONS true
 400
 401 /* When generating stabs debugging, use N_BINCL entries.  */
 402
 403 #define DBX_USE_BINCL
 404
 405 /* There is no limit to the length of stabs strings.  */
 406
 407 #define DBX_CONTIN_LENGTH 0
 408
 409 /* gdb needs a null N_SO at the end of each file for scattered loading.  */
 410
 411 #define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
 412
 413 /* GCC's definition of 'one_only' is the same as its definition of 'weak'.  */
 414 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 415
 416 /* Mach-O supports 'weak imports', and 'weak definitions' in coalesced
 417    sections.  machopic_select_section ensures that weak variables go in
 418    coalesced sections.  Weak aliases (or any other kind of aliases) are
 419    not supported.  Weak symbols that aren't visible outside the .s file
 420    are not supported.  */
 421 #define ASM_WEAKEN_DECL(FILE, DECL, NAME, ALIAS)                        \
 422   do {                                                                  \
 423     if (ALIAS)                                                          \
 424       {                                                                 \
 425         warning (0, "alias definitions not supported in Mach-O; ignored");      \
 426         break;                                                          \
 427       }                                                                 \
 428                                                                         \
 429     if (! DECL_EXTERNAL (DECL) && TREE_PUBLIC (DECL))                   \
 430       targetm.asm_out.globalize_label (FILE, NAME);                     \
 431     if (DECL_EXTERNAL (DECL))                                           \
 432       fputs ("\t.weak_reference ", FILE);                               \
 433     else if (lookup_attribute ("weak_import", DECL_ATTRIBUTES (DECL)))  \
 434       break;                                                            \
 435     else if (TREE_PUBLIC (DECL))                                        \
 436       fputs ("\t.weak_definition ", FILE);                              \
 437     else                                                                \
 438       break;                                                            \
 439     assemble_name (FILE, NAME);                                         \
 440     fputc ('\n', FILE);                                                 \
 441   } while (0)
 442
 443 /* Darwin has the pthread routines in libSystem, which every program
 444    links to, so there's no need for weak-ness for that.  */
 445 #define GTHREAD_USE_WEAK 0
 446
 447 /* The Darwin linker imposes two limitations on common symbols: they
 448    can't have hidden visibility, and they can't appear in dylibs.  As
 449    a consequence, we should never use common symbols to represent
 450    vague linkage. */
 451 #undef USE_COMMON_FOR_ONE_ONLY
 452 #define USE_COMMON_FOR_ONE_ONLY 0
 453
 454 /* The Darwin linker doesn't want coalesced symbols to appear in
 455    a static archive's table of contents. */
 456 #undef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
 457 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 1
 458
 459 /* On Darwin, we don't (at the time of writing) have linkonce sections
 460    with names, so it's safe to make the class data not comdat.  */
 461 #define TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT hook_bool_void_false
 462
 463 /* For efficiency, on Darwin the RTTI information that is always
 464    emitted in the standard C++ library should not be COMDAT.  */
 465 #define TARGET_CXX_LIBRARY_RTTI_COMDAT hook_bool_void_false
 466
 467 /* We make exception information linkonce. */
 468 #undef TARGET_USES_WEAK_UNWIND_INFO
 469 #define TARGET_USES_WEAK_UNWIND_INFO 1
 470
 471 /* We need to use a nonlocal label for the start of an EH frame: the
 472    Darwin linker requires that a coalesced section start with a label.
 473    Unfortunately, it also requires that 'debug' sections don't contain
 474    labels.  */
 475 #undef FRAME_BEGIN_LABEL
 476 #define FRAME_BEGIN_LABEL (for_eh ? "EH_frame" : "Lframe")
 477
 478 /* Emit a label for the FDE corresponding to DECL.  EMPTY means
 479    emit a label for an empty FDE. */
 480 #define TARGET_ASM_EMIT_UNWIND_LABEL darwin_emit_unwind_label
 481
 482 /* Emit a label to separate the exception table.  */
 483 #define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label
 484
 485 /* Our profiling scheme doesn't LP labels and counter words.  */
 486
 487 #define NO_PROFILE_COUNTERS     1
 488
 489 #undef  INIT_SECTION_ASM_OP
 490 #define INIT_SECTION_ASM_OP
 491
 492 #undef  INVOKE__main
 493
 494 #define TARGET_ASM_CONSTRUCTOR  machopic_asm_out_constructor
 495 #define TARGET_ASM_DESTRUCTOR   machopic_asm_out_destructor
 496
 497 /* Always prefix with an underscore.  */
 498
 499 #define USER_LABEL_PREFIX "_"
 500
 501 /* A dummy symbol that will be replaced with the function base name.  */
 502 #define MACHOPIC_FUNCTION_BASE_NAME "<pic base>"
 503
 504 /* Don't output a .file directive.  That is only used by the assembler for
 505    error reporting.  */
 506 #undef  TARGET_ASM_FILE_START_FILE_DIRECTIVE
 507 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
 508
 509 #undef  TARGET_ASM_FILE_END
 510 #define TARGET_ASM_FILE_END darwin_file_end
 511
 512 /* Because Mach-O relocations have a counter from 1 to 255 for the
 513    section number they apply to, it is necessary to output all
 514    normal sections before the LTO sections, to make sure that the
 515    sections that may have relocations always have a section number
 516    smaller than 255.  */
 517 #undef  TARGET_ASM_LTO_START
 518 #define TARGET_ASM_LTO_START darwin_asm_lto_start
 519 #undef  TARGET_ASM_LTO_END
 520 #define TARGET_ASM_LTO_END darwin_asm_lto_end
 521
 522 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
 523   fprintf (FILE, "\t.space "HOST_WIDE_INT_PRINT_UNSIGNED"\n", SIZE)
 524
 525 /* Give ObjC methods pretty symbol names.  */
 526
 527 #undef  OBJC_GEN_METHOD_LABEL
 528 #define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \
 529   do { if (CAT_NAME)                                                    \
 530          sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+',          \
 531                   (CLASS_NAME), (CAT_NAME), (SEL_NAME));                \
 532        else                                                             \
 533          sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+',              \
 534                   (CLASS_NAME), (SEL_NAME));                            \
 535      } while (0)
 536
 537 #undef ASM_DECLARE_OBJECT_NAME
 538 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
 539         darwin_asm_declare_object_name ((FILE), (NAME), (DECL))
 540
 541 /* The RTTI data (e.g., __ti4name) is common and public (and static),
 542    but it does need to be referenced via indirect PIC data pointers.
 543    The machopic_define_symbol calls are telling the machopic subsystem
 544    that the name *is* defined in this module, so it doesn't need to
 545    make them indirect.  */
 546
 547 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 548   do {                                                                  \
 549     const char *xname = NAME;                                           \
 550     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
 551       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
 552     if (! DECL_WEAK (DECL)                                              \
 553         && ((TREE_STATIC (DECL)                                         \
 554              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
 555             || DECL_INITIAL (DECL)))                                    \
 556         machopic_define_symbol (DECL_RTL (DECL));                       \
 557     if ((TREE_STATIC (DECL)                                             \
 558          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 559         || DECL_INITIAL (DECL))                                         \
 560       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
 561     ASM_OUTPUT_FUNCTION_LABEL (FILE, xname, DECL);                      \
 562   } while (0)
 563
 564 #undef TARGET_ASM_DECLARE_CONSTANT_NAME
 565 #define TARGET_ASM_DECLARE_CONSTANT_NAME darwin_asm_declare_constant_name
 566
 567 /* Wrap new method names in quotes so the assembler doesn't gag.
 568    Make Objective-C internal symbols local and in doing this, we need
 569    to accommodate the name mangling done by c++ on file scope locals.  */
 570
 571 int darwin_label_is_anonymous_local_objc_name (const char *name);
 572
 573 #undef  ASM_OUTPUT_LABELREF
 574 #define ASM_OUTPUT_LABELREF(FILE,NAME)                                       \
 575   do {                                                                       \
 576        const char *xname = (NAME);                                           \
 577        if (! strcmp (xname, MACHOPIC_FUNCTION_BASE_NAME))                    \
 578          machopic_output_function_base_name(FILE);                           \
 579        else if (xname[0] == '&' || xname[0] == '*')                          \
 580          {                                                                   \
 581            int len = strlen (xname);                                         \
 582            if (len > 6 && !strcmp ("$stub", xname + len - 5))                \
 583              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 584            else if (len > 7 && !strcmp ("$stub\"", xname + len - 6))         \
 585              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 586            else if (len > 14 && !strcmp ("$non_lazy_ptr", xname + len - 13)) \
 587              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 588            else if (len > 15 && !strcmp ("$non_lazy_ptr\"", xname + len - 14)) \
 589              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 590            if (xname[1] != '"' && name_needs_quotes (&xname[1]))             \
 591              fprintf (FILE, "\"%s\"", &xname[1]);                            \
 592            else                                                              \
 593              fputs (&xname[1], FILE);                                        \
 594          }                                                                   \
 595        else if (xname[0] == '+' || xname[0] == '-')                          \
 596          fprintf (FILE, "\"%s\"", xname);                                    \
 597        else if (darwin_label_is_anonymous_local_objc_name (xname))                                   \
 598          fprintf (FILE, "L%s", xname);                                       \
 599        else if (!strncmp (xname, ".objc_class_name_", 17))                   \
 600          fprintf (FILE, "%s", xname);                                        \
 601        else if (xname[0] != '"' && name_needs_quotes (xname))                \
 602          fprintf (FILE, "\"%s\"", xname);                                    \
 603        else                                                                  \
 604          asm_fprintf (FILE, "%U%s", xname);                                  \
 605   } while (0)
 606
 607 /* Output before executable code.  */
 608 #undef TEXT_SECTION_ASM_OP
 609 #define TEXT_SECTION_ASM_OP "\t.text"
 610
 611 /* Output before writable data.  */
 612
 613 #undef DATA_SECTION_ASM_OP
 614 #define DATA_SECTION_ASM_OP "\t.data"
 615
 616 #undef  ALIGN_ASM_OP
 617 #define ALIGN_ASM_OP            ".align"
 618
 619 #undef  ASM_OUTPUT_ALIGN
 620 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 621   if ((LOG) != 0)                       \
 622     fprintf (FILE, "\t%s\t%d\n", ALIGN_ASM_OP, (LOG))
 623
 624 /* The maximum alignment which the object file format can support in
 625    bits.  For Mach-O, this is 2^15 bytes.  */
 626
 627 #undef  MAX_OFILE_ALIGNMENT
 628 #define MAX_OFILE_ALIGNMENT (0x8000 * 8)
 629
 630 #define L2_MAX_OFILE_ALIGNMENT 15
 631
 632 /*  These are the three variants that emit referenced blank space.  */
 633 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)           \
 634         darwin_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 635
 636 #undef  ASM_OUTPUT_ALIGNED_DECL_LOCAL
 637 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)    \
 638         darwin_asm_output_aligned_decl_local                            \
 639                                   ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 640
 641 #undef  ASM_OUTPUT_ALIGNED_DECL_COMMON
 642 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN)   \
 643         darwin_asm_output_aligned_decl_common                           \
 644                                    ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 645
 646 /* The generic version, archs should over-ride where required.  */
 647 #define MACHOPIC_NL_SYMBOL_PTR_SECTION ".non_lazy_symbol_pointer"
 648
 649 /* Private flag applied to disable section-anchors in a particular section.
 650    This needs to be kept in sync with the flags used by varasm.c (defined in
 651    output.h).  */
 652 #define SECTION_NO_ANCHOR 0x2000000
 653
 654 /* Declare the section variables.  */
 655 #ifndef USED_FOR_TARGET
 656 enum darwin_section_enum {
 657 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) NAME,
 658 #include "darwin-sections.def"
 659 #undef DEF_SECTION
 660   NUM_DARWIN_SECTIONS
 661 };
 662 extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS];
 663 #endif
 664
 665 #undef  TARGET_ASM_SELECT_SECTION
 666 #define TARGET_ASM_SELECT_SECTION machopic_select_section
 667 #define USE_SELECT_SECTION_FOR_FUNCTIONS
 668 #undef  TARGET_ASM_FUNCTION_SECTION
 669 #define TARGET_ASM_FUNCTION_SECTION darwin_function_section
 670
 671 #undef  TARGET_ASM_SELECT_RTX_SECTION
 672 #define TARGET_ASM_SELECT_RTX_SECTION machopic_select_rtx_section
 673 #undef  TARGET_ASM_UNIQUE_SECTION
 674 #define TARGET_ASM_UNIQUE_SECTION darwin_unique_section
 675 #undef  TARGET_ASM_FUNCTION_RODATA_SECTION
 676 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
 677 #undef  TARGET_ASM_RELOC_RW_MASK
 678 #define TARGET_ASM_RELOC_RW_MASK machopic_reloc_rw_mask
 679
 680
 681 #define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME)                     \
 682     do {                                                                \
 683          if (FILE) {                                                    \
 684            if (MACHOPIC_INDIRECT)                                       \
 685              fprintf (FILE, "\t.lazy_reference ");                      \
 686            else                                                         \
 687              fprintf (FILE, "\t.reference ");                           \
 688            assemble_name (FILE, NAME);                                  \
 689            fprintf (FILE, "\n");                                        \
 690          }                                                              \
 691        } while (0)
 692
 693 #define ASM_DECLARE_CLASS_REFERENCE(FILE,NAME)                          \
 694     do {                                                                \
 695          if (FILE) {                                                    \
 696            fprintf (FILE, "\t");                                        \
 697            assemble_name (FILE, NAME);                                  \
 698            fprintf (FILE, "=0\n");                                      \
 699            (*targetm.asm_out.globalize_label) (FILE, NAME);             \
 700          }                                                              \
 701        } while (0)
 702
 703 /* Globalizing directive for a label.  */
 704 #define GLOBAL_ASM_OP "\t.globl "
 705 #define TARGET_ASM_GLOBALIZE_LABEL darwin_globalize_label
 706
 707 /* Emit an assembler directive to set visibility for a symbol.  Used
 708    to support visibility attribute and Darwin's private extern
 709    feature.  */
 710 #undef TARGET_ASM_ASSEMBLE_VISIBILITY
 711 #define TARGET_ASM_ASSEMBLE_VISIBILITY darwin_assemble_visibility
 712
 713 /* Extra attributes for Darwin.  */
 714 #define SUBTARGET_ATTRIBUTE_TABLE                                            \
 715   /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ \
 716   { "apple_kext_compatibility", 0, 0, false, true, false,                    \
 717     darwin_handle_kext_attribute },                                          \
 718   { "weak_import", 0, 0, true, false, false,                                 \
 719     darwin_handle_weak_import_attribute }
 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 /* All new versions of Darwin have C99 functions.  */
 889
 890 #define TARGET_C99_FUNCTIONS 1
 891
 892 #define WINT_TYPE "int"
 893
 894 /* Every program on darwin links against libSystem which contains the pthread
 895    routines, so there's no need to explicitly call out when doing threaded
 896    work.  */
 897
 898 #undef GOMP_SELF_SPECS
 899 #define GOMP_SELF_SPECS ""
 900
 901 /* Darwin disables section anchors by default.
 902    They should be enabled per arch where support exists in that arch.  */
 903 #define TARGET_ASM_OUTPUT_ANCHOR NULL
 904 #define DARWIN_SECTION_ANCHORS 0
 905
 906 /* Attempt to turn on execute permission for the stack.  This may be
 907     used by TARGET_TRAMPOLINE_INIT if the target needs it (that is,
 908     if the target machine can change execute permissions on a page).
 909
 910     There is no way to query the execute permission of the stack, so
 911     we always issue the mprotect() call.
 912
 913     Unfortunately it is not possible to make this namespace-clean.
 914
 915     Also note that no errors should be emitted by this code; it is
 916     considered dangerous for library calls to send messages to
 917     stdout/stderr.  */
 918
 919 #define ENABLE_EXECUTE_STACK                                            \
 920 extern void __enable_execute_stack (void *);                            \
 921 void                                                                    \
 922 __enable_execute_stack (void *addr)                                     \
 923 {                                                                       \
 924    extern int mprotect (void *, size_t, int);                           \
 925    extern int getpagesize (void);                                       \
 926    static int size;                                                     \
 927    static long mask;                                                    \
 928                                                                         \
 929    char *page, *end;                                                    \
 930                                                                         \
 931    if (size == 0)                                                       \
 932      {                                                                  \
 933        size = getpagesize();                                            \
 934        mask = ~((long) size - 1);                                       \
 935      }                                                                  \
 936                                                                         \
 937    page = (char *) (((long) addr) & mask);                              \
 938    end  = (char *) ((((long) (addr + (TARGET_64BIT ? 48 : 40))) & mask) + size); \
 939                                                                         \
 940    /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */                        \
 941    (void) mprotect (page, end - page, 7);                               \
 942 }
 943
 944 /* For Apple KEXTs, we make the constructors return this to match gcc
 945    2.95.  */
 946 #define TARGET_CXX_CDTOR_RETURNS_THIS (darwin_kextabi_p)
 947 #define TARGET_KEXTABI flag_apple_kext
 948
 949 /* We have target-specific builtins.  */
 950 #define TARGET_FOLD_BUILTIN darwin_fold_builtin
 951
 952 #define TARGET_OBJC_CONSTRUCT_STRING_OBJECT \
 953   darwin_objc_construct_string
 954
 955 #define TARGET_STRING_OBJECT_REF_TYPE_P \
 956   darwin_cfstring_ref_p
 957
 958 #define TARGET_N_FORMAT_TYPES 1
 959 #define TARGET_FORMAT_TYPES darwin_additional_format_types
 960
 961 #define TARGET_CHECK_STRING_OBJECT_FORMAT_ARG \
 962   darwin_check_cfstring_format_arg
 963
 964 #define TARGET_HAS_TARGETCM 1
 965
 966 extern void darwin_driver_init (unsigned int *decoded_options_count,
 967                                 struct cl_decoded_option **decoded_options);
 968 #define GCC_DRIVER_HOST_INITIALIZATION \
 969   darwin_driver_init (&decoded_options_count, &decoded_options)
 970
 971 /* The Apple assembler and linker do not support constructor priorities.  */
 972 #undef SUPPORTS_INIT_PRIORITY
 973 #define SUPPORTS_INIT_PRIORITY 0
 974
 975 #endif /* CONFIG_DARWIN_H */