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
   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 2, 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 You should have received a copy of the GNU General Public License
  20 along with GCC; see the file COPYING.  If not, write to
  21 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  22 Boston, MA 02110-1301, USA.  */
  23
  24 #ifndef CONFIG_DARWIN_H
  25 #define CONFIG_DARWIN_H
  26
  27 /* The definitions in this file are common to all processor types
  28    running Darwin, which is the kernel for Mac OS X.  Darwin is
  29    basically a BSD user layer laid over a Mach kernel, then evolved
  30    for many years (at NeXT) in parallel with other Unix systems.  So
  31    while the runtime is a somewhat idiosyncratic Mach-based thing,
  32    other definitions look like they would for a BSD variant.  */
  33
  34 /* Although NeXT ran on many different architectures, as of Jan 2001
  35    the only supported Darwin targets are PowerPC and x86.  */
  36
  37 /* One of Darwin's NeXT legacies is the Mach-O format, which is partly
  38    like a.out and partly like COFF, with additional features like
  39    multi-architecture binary support.  */
  40
  41 #define OBJECT_FORMAT_MACHO
  42
  43 /* Don't assume anything about the header files.  */
  44 #define NO_IMPLICIT_EXTERN_C
  45
  46 /* Suppress g++ attempt to link in the math library automatically. */
  47 #define MATH_LIBRARY ""
  48
  49 /* We have atexit.  */
  50
  51 #define HAVE_ATEXIT
  52
  53 /* Define an empty body for the function do_global_dtors() in libgcc2.c.  */
  54
  55 #define DO_GLOBAL_DTORS_BODY
  56
  57 /* The string value for __SIZE_TYPE__.  */
  58
  59 #ifndef SIZE_TYPE
  60 #define SIZE_TYPE "long unsigned int"
  61 #endif
  62
  63 /* Type used for ptrdiff_t, as a string used in a declaration.  */
  64
  65 #undef  PTRDIFF_TYPE
  66 #define PTRDIFF_TYPE "int"
  67
  68 /* wchar_t is int.  */
  69
  70 #undef  WCHAR_TYPE
  71 #define WCHAR_TYPE "int"
  72 #undef  WCHAR_TYPE_SIZE
  73 #define WCHAR_TYPE_SIZE 32
  74
  75 /* Default to using the NeXT-style runtime, since that's what is
  76    pre-installed on Darwin systems.  */
  77
  78 #define NEXT_OBJC_RUNTIME
  79
  80 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
  81    we want to retain compatibility with older gcc versions.  */
  82
  83 #undef  DEFAULT_PCC_STRUCT_RETURN
  84 #define DEFAULT_PCC_STRUCT_RETURN 0
  85
  86 /* True if pragma ms_struct is in effect.  */
  87 extern GTY(()) int darwin_ms_struct;
  88
  89 /* This table intercepts weirdo options whose names would interfere
  90    with normal driver conventions, and either translates them into
  91    standardly-named options, or adds a 'Z' so that they can get to
  92    specs processing without interference.
  93
  94    Do not expand a linker option to "-Xlinker -<option>", since that
  95    forfeits the ability to control via spec strings later.  However,
  96    as a special exception, do this translation with -filelist, because
  97    otherwise the driver will think there are no input files and quit.
  98    (The alternative would be to hack the driver to recognize -filelist
  99    specially, but it's simpler to use the translation table.)
 100
 101    Note that an option name with a prefix that matches another option
 102    name, that also takes an argument, needs to be modified so the
 103    prefix is different, otherwise a '*' after the shorter option will
 104    match with the longer one.
 105
 106    The SUBTARGET_OPTION_TRANSLATE_TABLE macro, which _must_ be defined
 107    in gcc/config/{i386,rs6000}/darwin.h, should contain any additional
 108    command-line option translations specific to the particular target
 109    architecture.  */
 110
 111 #define TARGET_OPTION_TRANSLATE_TABLE \
 112   { "-all_load", "-Zall_load" },  \
 113   { "-allowable_client", "-Zallowable_client" },  \
 114   { "-arch_errors_fatal", "-Zarch_errors_fatal" },  \
 115   { "-bind_at_load", "-Zbind_at_load" },  \
 116   { "-bundle", "-Zbundle" },  \
 117   { "-bundle_loader", "-Zbundle_loader" },  \
 118   { "-weak_reference_mismatches", "-Zweak_reference_mismatches" },  \
 119   { "-dead_strip", "-Zdead_strip" }, \
 120   { "-no_dead_strip_inits_and_terms", "-Zno_dead_strip_inits_and_terms" }, \
 121   { "-dependency-file", "-MF" }, \
 122   { "-dylib_file", "-Zdylib_file" }, \
 123   { "-dynamic", "-Zdynamic" },  \
 124   { "-dynamiclib", "-Zdynamiclib" },  \
 125   { "-exported_symbols_list", "-Zexported_symbols_list" },  \
 126   { "-gfull", "-g -fno-eliminate-unused-debug-symbols" }, \
 127   { "-gused", "-g -feliminate-unused-debug-symbols" }, \
 128   { "-segaddr", "-Zsegaddr" }, \
 129   { "-segs_read_only_addr", "-Zsegs_read_only_addr" }, \
 130   { "-segs_read_write_addr", "-Zsegs_read_write_addr" }, \
 131   { "-seg_addr_table", "-Zseg_addr_table" }, \
 132   { "-seg_addr_table_filename", "-Zfn_seg_addr_table_filename" }, \
 133   { "-umbrella", "-Zumbrella" }, \
 134   { "-fapple-kext", "-fapple-kext -static -Wa,-static" }, \
 135   { "-filelist", "-Xlinker -filelist -Xlinker" },  \
 136   { "-findirect-virtual-calls", "-fapple-kext" }, \
 137   { "-flat_namespace", "-Zflat_namespace" },  \
 138   { "-force_cpusubtype_ALL", "-Zforce_cpusubtype_ALL" },  \
 139   { "-force_flat_namespace", "-Zforce_flat_namespace" },  \
 140   { "-framework", "-Xlinker -framework -Xlinker" },  \
 141   { "-fterminated-vtables", "-fapple-kext" }, \
 142   { "-image_base", "-Zimage_base" },  \
 143   { "-init", "-Zinit" },  \
 144   { "-install_name", "-Zinstall_name" },  \
 145   { "-mkernel", "-mkernel -static -Wa,-static" }, \
 146   { "-multiply_defined_unused", "-Zmultiplydefinedunused" },  \
 147   { "-multiply_defined", "-Zmultiply_defined" },  \
 148   { "-multi_module", "-Zmulti_module" },  \
 149   { "-static", "-static -Wa,-static" },  \
 150   { "-single_module", "-Zsingle_module" },  \
 151   { "-unexported_symbols_list", "-Zunexported_symbols_list" }, \
 152   SUBTARGET_OPTION_TRANSLATE_TABLE
 153
 154 #define SUBSUBTARGET_OVERRIDE_OPTIONS                                   \
 155   do {                                                                  \
 156     darwin_override_options ();                                         \
 157   } while (0)
 158
 159 /* These compiler options take n arguments.  */
 160
 161 #undef  WORD_SWITCH_TAKES_ARG
 162 #define WORD_SWITCH_TAKES_ARG(STR)              \
 163   (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) ? 1 :    \
 164    !strcmp (STR, "Zallowable_client") ? 1 :     \
 165    !strcmp (STR, "arch") ? 1 :                  \
 166    !strcmp (STR, "arch_only") ? 1 :             \
 167    !strcmp (STR, "Zbundle_loader") ? 1 :        \
 168    !strcmp (STR, "client_name") ? 1 :           \
 169    !strcmp (STR, "compatibility_version") ? 1 : \
 170    !strcmp (STR, "current_version") ? 1 :       \
 171    !strcmp (STR, "Zdylib_file") ? 1 :           \
 172    !strcmp (STR, "Zexported_symbols_list") ? 1 : \
 173    !strcmp (STR, "Zimage_base") ? 1 :           \
 174    !strcmp (STR, "Zinit") ? 1 :                 \
 175    !strcmp (STR, "Zinstall_name") ? 1 :         \
 176    !strcmp (STR, "Zmultiplydefinedunused") ? 1 : \
 177    !strcmp (STR, "Zmultiply_defined") ? 1 :     \
 178    !strcmp (STR, "precomp-trustfile") ? 1 :     \
 179    !strcmp (STR, "read_only_relocs") ? 1 :      \
 180    !strcmp (STR, "sectcreate") ? 3 :            \
 181    !strcmp (STR, "sectorder") ? 3 :             \
 182    !strcmp (STR, "Zsegaddr") ? 2 :              \
 183    !strcmp (STR, "Zsegs_read_only_addr") ? 1 :  \
 184    !strcmp (STR, "Zsegs_read_write_addr") ? 1 : \
 185    !strcmp (STR, "Zseg_addr_table") ? 1 :       \
 186    !strcmp (STR, "Zfn_seg_addr_table_filename") ? 1 :\
 187    !strcmp (STR, "seg1addr") ? 1 :              \
 188    !strcmp (STR, "segprot") ? 3 :               \
 189    !strcmp (STR, "sub_library") ? 1 :           \
 190    !strcmp (STR, "sub_umbrella") ? 1 :          \
 191    !strcmp (STR, "Zumbrella") ? 1 :             \
 192    !strcmp (STR, "undefined") ? 1 :             \
 193    !strcmp (STR, "Zunexported_symbols_list") ? 1 : \
 194    !strcmp (STR, "Zweak_reference_mismatches") ? 1 : \
 195    !strcmp (STR, "pagezero_size") ? 1 :         \
 196    !strcmp (STR, "segs_read_only_addr") ? 1 :   \
 197    !strcmp (STR, "segs_read_write_addr") ? 1 :  \
 198    !strcmp (STR, "sectalign") ? 3 :             \
 199    !strcmp (STR, "sectobjectsymbols") ? 2 :     \
 200    !strcmp (STR, "segcreate") ? 3 :             \
 201    !strcmp (STR, "dylinker_install_name") ? 1 : \
 202    0)
 203
 204 #define SUBTARGET_C_COMMON_OVERRIDE_OPTIONS do {                        \
 205     if (flag_mkernel || flag_apple_kext)                                \
 206       {                                                                 \
 207         if (flag_use_cxa_atexit == 2)                                   \
 208           flag_use_cxa_atexit = 0;                                      \
 209         /* kexts should always be built without the coalesced sections  \
 210            because the kernel loader doesn't grok such sections.  */    \
 211         flag_weak = 0;                                                  \
 212         /* No RTTI in kexts.  */                                        \
 213         flag_rtti = 0;                                                  \
 214       }                                                                 \
 215   } while (0)
 216
 217 /* Machine dependent cpp options.  Don't add more options here, add
 218    them to darwin_cpp_builtins in darwin-c.c.  */
 219
 220 #undef  CPP_SPEC
 221 #define CPP_SPEC "%{static:%{!dynamic:-D__STATIC__}}%{!static:-D__DYNAMIC__}" \
 222         " %{pthread:-D_REENTRANT}"
 223
 224 /* This is mostly a clone of the standard LINK_COMMAND_SPEC, plus
 225    precomp, libtool, and fat build additions.  Also we
 226    don't specify a second %G after %L because libSystem is
 227    self-contained and doesn't need to link against libgcc.a.  */
 228 /* In general, random Darwin linker flags should go into LINK_SPEC
 229    instead of LINK_COMMAND_SPEC.  The command spec is better for
 230    specifying the handling of options understood by generic Unix
 231    linkers, and for positional arguments like libraries.  */
 232 #define LINK_COMMAND_SPEC "\
 233 %{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
 234     %(linker) %l %X %{d} %{s} %{t} %{Z} %{u*} \
 235     %{A} %{e*} %{m} %{r} %{x} \
 236     %{o*}%{!o:-o a.out} \
 237     %{!A:%{!nostdlib:%{!nostartfiles:%S}}} \
 238     %{L*} %{fopenmp:%:include(libgomp.spec)%(link_gomp)}   \
 239     %(link_libgcc) %o %{fprofile-arcs|fprofile-generate|coverage:-lgcov} \
 240     %{!nostdlib:%{!nodefaultlibs:%(link_ssp) %G %L}} \
 241     %{!A:%{!nostdlib:%{!nostartfiles:%E}}} %{T*} %{F*} }}}}}}}\n\
 242 %{!fdump=*:%{!fsyntax-only:%{!c:%{!M:%{!MM:%{!E:%{!S:\
 243     %{.c|.cc|.C|.cpp|.c++|.CPP|.m|.mm: \
 244     %{gdwarf-2:%{!gstabs*:%{!g0: dsymutil %{o*:%*}%{!o:a.out}}}}}}}}}}}}"
 245
 246 #ifdef TARGET_SYSTEM_ROOT
 247 #define LINK_SYSROOT_SPEC \
 248   "%{isysroot*:-syslibroot %*;:-syslibroot " TARGET_SYSTEM_ROOT "}"
 249 #else
 250 #define LINK_SYSROOT_SPEC "%{isysroot*:-syslibroot %*}"
 251 #endif
 252
 253 /* Please keep the random linker options in alphabetical order (modulo
 254    'Z' and 'no' prefixes). Note that options taking arguments may appear
 255    multiple times on a command line with different arguments each time,
 256    so put a * after their names so all of them get passed.  */
 257 #define LINK_SPEC  \
 258   "%{static}%{!static:-dynamic} \
 259    %{fgnu-runtime:%:replace-outfile(-lobjc -lobjc-gnu)}\
 260    %{!Zdynamiclib: \
 261      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch) -force_cpusubtype_ALL} \
 262      %{!Zforce_cpusubtype_ALL:-arch %(darwin_subarch)} \
 263      %{Zbundle:-bundle} \
 264      %{Zbundle_loader*:-bundle_loader %*} \
 265      %{client_name*} \
 266      %{compatibility_version*:%e-compatibility_version only allowed with -dynamiclib\
 267 } \
 268      %{current_version*:%e-current_version only allowed with -dynamiclib} \
 269      %{Zforce_flat_namespace:-force_flat_namespace} \
 270      %{Zinstall_name*:%e-install_name only allowed with -dynamiclib} \
 271      %{keep_private_externs} \
 272      %{private_bundle} \
 273     } \
 274    %{Zdynamiclib: -dylib \
 275      %{Zbundle:%e-bundle not allowed with -dynamiclib} \
 276      %{Zbundle_loader*:%e-bundle_loader not allowed with -dynamiclib} \
 277      %{client_name*:%e-client_name not allowed with -dynamiclib} \
 278      %{compatibility_version*:-dylib_compatibility_version %*} \
 279      %{current_version*:-dylib_current_version %*} \
 280      %{Zforce_cpusubtype_ALL:-arch %(darwin_arch)} \
 281      %{!Zforce_cpusubtype_ALL: -arch %(darwin_subarch)} \
 282      %{Zforce_flat_namespace:%e-force_flat_namespace not allowed with -dynamiclib} \
 283      %{Zinstall_name*:-dylib_install_name %*} \
 284      %{keep_private_externs:%e-keep_private_externs not allowed with -dynamiclib} \
 285      %{private_bundle:%e-private_bundle not allowed with -dynamiclib} \
 286     } \
 287    %{Zall_load:-all_load} \
 288    %{Zallowable_client*:-allowable_client %*} \
 289    %{Zbind_at_load:-bind_at_load} \
 290    %{Zarch_errors_fatal:-arch_errors_fatal} \
 291    %{Zdead_strip:-dead_strip} \
 292    %{Zno_dead_strip_inits_and_terms:-no_dead_strip_inits_and_terms} \
 293    %{Zdylib_file*:-dylib_file %*} \
 294    %{Zdynamic:-dynamic}\
 295    %{Zexported_symbols_list*:-exported_symbols_list %*} \
 296    %{Zflat_namespace:-flat_namespace} \
 297    %{headerpad_max_install_names*} \
 298    %{Zimage_base*:-image_base %*} \
 299    %{Zinit*:-init %*} \
 300    %{!mmacosx-version-min=*:-macosx_version_min %(darwin_minversion)} \
 301    %{mmacosx-version-min=*:-macosx_version_min %*} \
 302    %{nomultidefs} \
 303    %{Zmulti_module:-multi_module} %{Zsingle_module:-single_module} \
 304    %{Zmultiply_defined*:-multiply_defined %*} \
 305    %{!Zmultiply_defined*:%{shared-libgcc: \
 306      %:version-compare(< 10.5 mmacosx-version-min= -multiply_defined) \
 307      %:version-compare(< 10.5 mmacosx-version-min= suppress)}} \
 308    %{Zmultiplydefinedunused*:-multiply_defined_unused %*} \
 309    %{prebind} %{noprebind} %{nofixprebinding} %{prebind_all_twolevel_modules} \
 310    %{read_only_relocs} \
 311    %{sectcreate*} %{sectorder*} %{seg1addr*} %{segprot*} \
 312    %{Zsegaddr*:-segaddr %*} \
 313    %{Zsegs_read_only_addr*:-segs_read_only_addr %*} \
 314    %{Zsegs_read_write_addr*:-segs_read_write_addr %*} \
 315    %{Zseg_addr_table*: -seg_addr_table %*} \
 316    %{Zfn_seg_addr_table_filename*:-seg_addr_table_filename %*} \
 317    %{sub_library*} %{sub_umbrella*} \
 318    " LINK_SYSROOT_SPEC " \
 319    %{twolevel_namespace} %{twolevel_namespace_hints} \
 320    %{Zumbrella*: -umbrella %*} \
 321    %{undefined*} \
 322    %{Zunexported_symbols_list*:-unexported_symbols_list %*} \
 323    %{Zweak_reference_mismatches*:-weak_reference_mismatches %*} \
 324    %{!Zweak_reference_mismatches*:-weak_reference_mismatches non-weak} \
 325    %{X} \
 326    %{y*} \
 327    %{w} \
 328    %{pagezero_size*} %{segs_read_*} %{seglinkedit} %{noseglinkedit}  \
 329    %{sectalign*} %{sectobjectsymbols*} %{segcreate*} %{whyload} \
 330    %{whatsloaded} %{dylinker_install_name*} \
 331    %{dylinker} %{Mach} "
 332
 333
 334 /* Machine dependent libraries.  */
 335
 336 #define LIB_SPEC "%{!static:-lSystem}"
 337
 338 /* Support -mmacosx-version-min by supplying different (stub) libgcc_s.dylib
 339    libraries to link against, and by not linking against libgcc_s on
 340    earlier-than-10.3.9.
 341
 342    Note that by default, -lgcc_eh is not linked against!  This is
 343    because in a future version of Darwin the EH frame information may
 344    be in a new format, or the fallback routine might be changed; if
 345    you want to explicitly link against the static version of those
 346    routines, because you know you don't need to unwind through system
 347    libraries, you need to explicitly say -static-libgcc.
 348
 349    If it is linked against, it has to be before -lgcc, because it may
 350    need symbols from -lgcc.  */
 351 #undef REAL_LIBGCC_SPEC
 352 #define REAL_LIBGCC_SPEC                                                   \
 353    "%{static-libgcc|static: -lgcc_eh -lgcc;                                \
 354       shared-libgcc|fexceptions:                                           \
 355        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4)        \
 356        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
 357        -lgcc;                                                              \
 358       :%:version-compare(>< 10.3.9 10.5 mmacosx-version-min= -lgcc_s.10.4) \
 359        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)        \
 360        -lgcc}"
 361
 362 /* We specify crt0.o as -lcrt0.o so that ld will search the library path.
 363
 364    crt3.o provides __cxa_atexit on systems that don't have it.  Since
 365    it's only used with C++, which requires passing -shared-libgcc, key
 366    off that to avoid unnecessarily adding a destructor to every
 367    powerpc program built.  */
 368
 369 #undef  STARTFILE_SPEC
 370 #define STARTFILE_SPEC                                                      \
 371   "%{Zdynamiclib: %(darwin_dylib1) }                                        \
 372    %{!Zdynamiclib:%{Zbundle:%{!static:-lbundle1.o}}                         \
 373      %{!Zbundle:%{pg:%{static:-lgcrt0.o}                                    \
 374                      %{!static:%{object:-lgcrt0.o}                          \
 375                                %{!object:%{preload:-lgcrt0.o}               \
 376                                  %{!preload:-lgcrt1.o %(darwin_crt2)}}}}    \
 377                 %{!pg:%{static:-lcrt0.o}                                    \
 378                       %{!static:%{object:-lcrt0.o}                          \
 379                                 %{!object:%{preload:-lcrt0.o}               \
 380                                   %{!preload: %(darwin_crt1)                \
 381                                               %(darwin_crt2)}}}}}}          \
 382   %{shared-libgcc:%:version-compare(< 10.5 mmacosx-version-min= crt3.o%s)}"
 383
 384 /* The native Darwin linker doesn't necessarily place files in the order
 385    that they're specified on the link line.  Thus, it is pointless
 386    to put anything in ENDFILE_SPEC.  */
 387 /* #define ENDFILE_SPEC "" */
 388
 389 #define DARWIN_EXTRA_SPECS                                              \
 390   { "darwin_crt1", DARWIN_CRT1_SPEC },                                  \
 391   { "darwin_dylib1", DARWIN_DYLIB1_SPEC },                              \
 392   { "darwin_minversion", DARWIN_MINVERSION_SPEC },
 393
 394 #define DARWIN_DYLIB1_SPEC                                              \
 395   "%:version-compare(!> 10.5 mmacosx-version-min= -ldylib1.o)           \
 396    %:version-compare(>= 10.5 mmacosx-version-min= -ldylib1.10.5.o)"
 397
 398 #define DARWIN_CRT1_SPEC                                                \
 399   "%:version-compare(!> 10.5 mmacosx-version-min= -lcrt1.o)             \
 400    %:version-compare(>= 10.5 mmacosx-version-min= -lcrt1.10.5.o)"
 401
 402 /* Default Darwin ASM_SPEC, very simple.  */
 403 #define ASM_SPEC "-arch %(darwin_arch) \
 404   %{Zforce_cpusubtype_ALL:-force_cpusubtype_ALL}"
 405
 406 /* We still allow output of STABS.  */
 407
 408 #define DBX_DEBUGGING_INFO 1
 409
 410 #define DWARF2_DEBUGGING_INFO
 411 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 412
 413 #define DEBUG_FRAME_SECTION     "__DWARF,__debug_frame,regular,debug"
 414 #define DEBUG_INFO_SECTION      "__DWARF,__debug_info,regular,debug"
 415 #define DEBUG_ABBREV_SECTION    "__DWARF,__debug_abbrev,regular,debug"
 416 #define DEBUG_ARANGES_SECTION   "__DWARF,__debug_aranges,regular,debug"
 417 #define DEBUG_MACINFO_SECTION   "__DWARF,__debug_macinfo,regular,debug"
 418 #define DEBUG_LINE_SECTION      "__DWARF,__debug_line,regular,debug"
 419 #define DEBUG_LOC_SECTION       "__DWARF,__debug_loc,regular,debug"
 420 #define DEBUG_PUBNAMES_SECTION  "__DWARF,__debug_pubnames,regular,debug"
 421 #define DEBUG_PUBTYPES_SECTION  "__DWARF,__debug_pubtypes,regular,debug"
 422 #define DEBUG_STR_SECTION       "__DWARF,__debug_str,regular,debug"
 423 #define DEBUG_RANGES_SECTION    "__DWARF,__debug_ranges,regular,debug"
 424
 425 /* When generating stabs debugging, use N_BINCL entries.  */
 426
 427 #define DBX_USE_BINCL
 428
 429 /* There is no limit to the length of stabs strings.  */
 430
 431 #define DBX_CONTIN_LENGTH 0
 432
 433 /* gdb needs a null N_SO at the end of each file for scattered loading.  */
 434
 435 #define DBX_OUTPUT_NULL_N_SO_AT_MAIN_SOURCE_FILE_END
 436
 437 /* GCC's definition of 'one_only' is the same as its definition of 'weak'.  */
 438 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 439
 440 /* Mach-O supports 'weak imports', and 'weak definitions' in coalesced
 441    sections.  machopic_select_section ensures that weak variables go in
 442    coalesced sections.  Weak aliases (or any other kind of aliases) are
 443    not supported.  Weak symbols that aren't visible outside the .s file
 444    are not supported.  */
 445 #define ASM_WEAKEN_DECL(FILE, DECL, NAME, ALIAS)                        \
 446   do {                                                                  \
 447     if (ALIAS)                                                          \
 448       {                                                                 \
 449         warning (0, "alias definitions not supported in Mach-O; ignored");      \
 450         break;                                                          \
 451       }                                                                 \
 452                                                                         \
 453     if (! DECL_EXTERNAL (DECL) && TREE_PUBLIC (DECL))                   \
 454       targetm.asm_out.globalize_label (FILE, NAME);                     \
 455     if (DECL_EXTERNAL (DECL))                                           \
 456       fputs ("\t.weak_reference ", FILE);                               \
 457     else if (! lookup_attribute ("weak", DECL_ATTRIBUTES (DECL))        \
 458         && lookup_attribute ("weak_import", DECL_ATTRIBUTES (DECL)))    \
 459       break;                                                            \
 460     else if (TREE_PUBLIC (DECL))                                        \
 461       fputs ("\t.weak_definition ", FILE);                              \
 462     else                                                                \
 463       break;                                                            \
 464     assemble_name (FILE, NAME);                                         \
 465     fputc ('\n', FILE);                                                 \
 466   } while (0)
 467
 468 /* Darwin has the pthread routines in libSystem, which every program
 469    links to, so there's no need for weak-ness for that.  */
 470 #define GTHREAD_USE_WEAK 0
 471
 472 /* The Darwin linker imposes two limitations on common symbols: they
 473    can't have hidden visibility, and they can't appear in dylibs.  As
 474    a consequence, we should never use common symbols to represent
 475    vague linkage. */
 476 #undef USE_COMMON_FOR_ONE_ONLY
 477 #define USE_COMMON_FOR_ONE_ONLY 0
 478
 479 /* The Darwin linker doesn't want coalesced symbols to appear in
 480    a static archive's table of contents. */
 481 #undef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
 482 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 1
 483
 484 /* On Darwin, we don't (at the time of writing) have linkonce sections
 485    with names, so it's safe to make the class data not comdat.  */
 486 #define TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT hook_bool_void_false
 487
 488 /* For efficiency, on Darwin the RTTI information that is always
 489    emitted in the standard C++ library should not be COMDAT.  */
 490 #define TARGET_CXX_LIBRARY_RTTI_COMDAT hook_bool_void_false
 491
 492 /* We make exception information linkonce. */
 493 #undef TARGET_USES_WEAK_UNWIND_INFO
 494 #define TARGET_USES_WEAK_UNWIND_INFO 1
 495
 496 /* We need to use a nonlocal label for the start of an EH frame: the
 497    Darwin linker requires that a coalesced section start with a label.
 498    Unfortunately, it also requires that 'debug' sections don't contain
 499    labels.  */
 500 #undef FRAME_BEGIN_LABEL
 501 #define FRAME_BEGIN_LABEL (for_eh ? "EH_frame" : "Lframe")
 502
 503 /* Emit a label for the FDE corresponding to DECL.  EMPTY means
 504    emit a label for an empty FDE. */
 505 #define TARGET_ASM_EMIT_UNWIND_LABEL darwin_emit_unwind_label
 506
 507 /* Emit a label to separate the exception table.  */
 508 #define TARGET_ASM_EMIT_EXCEPT_TABLE_LABEL darwin_emit_except_table_label
 509
 510 /* Our profiling scheme doesn't LP labels and counter words.  */
 511
 512 #define NO_PROFILE_COUNTERS     1
 513
 514 #undef  INIT_SECTION_ASM_OP
 515 #define INIT_SECTION_ASM_OP
 516
 517 #undef  INVOKE__main
 518
 519 #define TARGET_ASM_CONSTRUCTOR  machopic_asm_out_constructor
 520 #define TARGET_ASM_DESTRUCTOR   machopic_asm_out_destructor
 521
 522 /* Always prefix with an underscore.  */
 523
 524 #define USER_LABEL_PREFIX "_"
 525
 526 /* Don't output a .file directive.  That is only used by the assembler for
 527    error reporting.  */
 528 #undef  TARGET_ASM_FILE_START_FILE_DIRECTIVE
 529 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
 530
 531 #undef  TARGET_ASM_FILE_END
 532 #define TARGET_ASM_FILE_END darwin_file_end
 533
 534 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
 535   fprintf (FILE, "\t.space "HOST_WIDE_INT_PRINT_UNSIGNED"\n", SIZE)
 536
 537 /* Give ObjC methods pretty symbol names.  */
 538
 539 #undef  OBJC_GEN_METHOD_LABEL
 540 #define OBJC_GEN_METHOD_LABEL(BUF,IS_INST,CLASS_NAME,CAT_NAME,SEL_NAME,NUM) \
 541   do { if (CAT_NAME)                                                    \
 542          sprintf (BUF, "%c[%s(%s) %s]", (IS_INST) ? '-' : '+',          \
 543                   (CLASS_NAME), (CAT_NAME), (SEL_NAME));                \
 544        else                                                             \
 545          sprintf (BUF, "%c[%s %s]", (IS_INST) ? '-' : '+',              \
 546                   (CLASS_NAME), (SEL_NAME));                            \
 547      } while (0)
 548
 549 /* The RTTI data (e.g., __ti4name) is common and public (and static),
 550    but it does need to be referenced via indirect PIC data pointers.
 551    The machopic_define_symbol calls are telling the machopic subsystem
 552    that the name *is* defined in this module, so it doesn't need to
 553    make them indirect.  */
 554
 555 #undef ASM_DECLARE_OBJECT_NAME
 556 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)                       \
 557   do {                                                                  \
 558     const char *xname = NAME;                                           \
 559     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
 560       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
 561     if (! DECL_WEAK (DECL)                                              \
 562         && ((TREE_STATIC (DECL)                                         \
 563              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
 564             || DECL_INITIAL (DECL)))                                    \
 565         machopic_define_symbol (DECL_RTL (DECL));                       \
 566     if ((TREE_STATIC (DECL)                                             \
 567          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 568         || DECL_INITIAL (DECL))                                         \
 569       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
 570     ASM_OUTPUT_LABEL (FILE, xname);                                     \
 571     /* Darwin doesn't support zero-size objects, so give them a         \
 572        byte.  */                                                        \
 573     if (tree_low_cst (DECL_SIZE_UNIT (DECL), 1) == 0)                   \
 574       assemble_zeros (1);                                               \
 575   } while (0)
 576
 577 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 578   do {                                                                  \
 579     const char *xname = NAME;                                           \
 580     if (GET_CODE (XEXP (DECL_RTL (DECL), 0)) != SYMBOL_REF)             \
 581       xname = IDENTIFIER_POINTER (DECL_NAME (DECL));                    \
 582     if (! DECL_WEAK (DECL)                                              \
 583         && ((TREE_STATIC (DECL)                                         \
 584              && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))           \
 585             || DECL_INITIAL (DECL)))                                    \
 586         machopic_define_symbol (DECL_RTL (DECL));                       \
 587     if ((TREE_STATIC (DECL)                                             \
 588          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 589         || DECL_INITIAL (DECL))                                         \
 590       (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false);   \
 591     ASM_OUTPUT_LABEL (FILE, xname);                                     \
 592   } while (0)
 593
 594 #define ASM_DECLARE_CONSTANT_NAME(FILE, NAME, EXP, SIZE)        \
 595   do {                                                          \
 596     ASM_OUTPUT_LABEL (FILE, NAME);                              \
 597     /* Darwin doesn't support zero-size objects, so give them a \
 598        byte.  */                                                \
 599     if ((SIZE) == 0)                                            \
 600       assemble_zeros (1);                                       \
 601   } while (0)
 602
 603 /* Wrap new method names in quotes so the assembler doesn't gag.
 604    Make Objective-C internal symbols local.  */
 605
 606 #undef  ASM_OUTPUT_LABELREF
 607 #define ASM_OUTPUT_LABELREF(FILE,NAME)                                       \
 608   do {                                                                       \
 609        const char *xname = (NAME);                                           \
 610        if (! strcmp (xname, "<pic base>"))                                   \
 611          machopic_output_function_base_name(FILE);                           \
 612        else if (xname[0] == '&' || xname[0] == '*')                          \
 613          {                                                                   \
 614            int len = strlen (xname);                                         \
 615            if (len > 6 && !strcmp ("$stub", xname + len - 5))                \
 616              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 617            else if (len > 7 && !strcmp ("$stub\"", xname + len - 6))         \
 618              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 619            else if (len > 14 && !strcmp ("$non_lazy_ptr", xname + len - 13)) \
 620              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 621            else if (len > 15 && !strcmp ("$non_lazy_ptr\"", xname + len - 14)) \
 622              machopic_validate_stub_or_non_lazy_ptr (xname);                 \
 623            if (xname[1] != '"' && name_needs_quotes (&xname[1]))             \
 624              fprintf (FILE, "\"%s\"", &xname[1]);                            \
 625            else                                                              \
 626              fputs (&xname[1], FILE);                                        \
 627          }                                                                   \
 628        else if (xname[0] == '+' || xname[0] == '-')                          \
 629          fprintf (FILE, "\"%s\"", xname);                                    \
 630        else if (!strncmp (xname, "_OBJC_", 6))                               \
 631          fprintf (FILE, "L%s", xname);                                       \
 632        else if (!strncmp (xname, ".objc_class_name_", 17))                   \
 633          fprintf (FILE, "%s", xname);                                        \
 634        else if (xname[0] != '"' && name_needs_quotes (xname))                \
 635          fprintf (FILE, "\"%s\"", xname);                                    \
 636        else                                                                  \
 637          asm_fprintf (FILE, "%U%s", xname);                                  \
 638   } while (0)
 639
 640 /* Output before executable code.  */
 641 #undef TEXT_SECTION_ASM_OP
 642 #define TEXT_SECTION_ASM_OP "\t.text"
 643
 644 /* Output before writable data.  */
 645
 646 #undef DATA_SECTION_ASM_OP
 647 #define DATA_SECTION_ASM_OP "\t.data"
 648
 649 #undef  ALIGN_ASM_OP
 650 #define ALIGN_ASM_OP            ".align"
 651
 652 #undef  ASM_OUTPUT_ALIGN
 653 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 654   if ((LOG) != 0)                       \
 655     fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG))
 656
 657 /* Ensure correct alignment of bss data.  */
 658
 659 #undef  ASM_OUTPUT_ALIGNED_DECL_LOCAL
 660 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)    \
 661   do {                                                                  \
 662     unsigned HOST_WIDE_INT _new_size = SIZE;                            \
 663     fputs (".lcomm ", (FILE));                                          \
 664     assemble_name ((FILE), (NAME));                                     \
 665     if (_new_size == 0) _new_size = 1;                                  \
 666     fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", _new_size, \
 667              floor_log2 ((ALIGN) / BITS_PER_UNIT));                     \
 668     if ((DECL) && ((TREE_STATIC (DECL)                                  \
 669          && (!DECL_COMMON (DECL) || !TREE_PUBLIC (DECL)))               \
 670         || DECL_INITIAL (DECL)))                                        \
 671       {                                                                 \
 672         (* targetm.encode_section_info) (DECL, DECL_RTL (DECL), false); \
 673         machopic_define_symbol (DECL_RTL (DECL));                       \
 674       }                                                                 \
 675   } while (0)
 676
 677 /* The maximum alignment which the object file format can support.
 678    For Mach-O, this is 2^15.  */
 679
 680 #undef  MAX_OFILE_ALIGNMENT
 681 #define MAX_OFILE_ALIGNMENT 0x8000
 682
 683 /* Declare the section variables.  */
 684 #ifndef USED_FOR_TARGET
 685 enum darwin_section_enum {
 686 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) NAME,
 687 #include "darwin-sections.def"
 688 #undef DEF_SECTION
 689   NUM_DARWIN_SECTIONS
 690 };
 691 extern GTY(()) section * darwin_sections[NUM_DARWIN_SECTIONS];
 692 #endif
 693
 694 #undef  TARGET_ASM_SELECT_SECTION
 695 #define TARGET_ASM_SELECT_SECTION machopic_select_section
 696 #define USE_SELECT_SECTION_FOR_FUNCTIONS
 697
 698 #undef  TARGET_ASM_SELECT_RTX_SECTION
 699 #define TARGET_ASM_SELECT_RTX_SECTION machopic_select_rtx_section
 700 #undef  TARGET_ASM_UNIQUE_SECTION
 701 #define TARGET_ASM_UNIQUE_SECTION darwin_unique_section
 702 #undef  TARGET_ASM_FUNCTION_RODATA_SECTION
 703 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
 704
 705
 706 #define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME)                     \
 707     do {                                                                \
 708          if (FILE) {                                                    \
 709            if (MACHOPIC_INDIRECT)                                       \
 710              fprintf (FILE, "\t.lazy_reference ");                      \
 711            else                                                         \
 712              fprintf (FILE, "\t.reference ");                           \
 713            assemble_name (FILE, NAME);                                  \
 714            fprintf (FILE, "\n");                                        \
 715          }                                                              \
 716        } while (0)
 717
 718 #define ASM_DECLARE_CLASS_REFERENCE(FILE,NAME)                          \
 719     do {                                                                \
 720          if (FILE) {                                                    \
 721            fprintf (FILE, "\t");                                        \
 722            assemble_name (FILE, NAME);                                  \
 723            fprintf (FILE, "=0\n");                                      \
 724            (*targetm.asm_out.globalize_label) (FILE, NAME);             \
 725          }                                                              \
 726        } while (0)
 727
 728 /* Globalizing directive for a label.  */
 729 #define GLOBAL_ASM_OP ".globl "
 730 #define TARGET_ASM_GLOBALIZE_LABEL darwin_globalize_label
 731
 732 /* Emit an assembler directive to set visibility for a symbol.  Used
 733    to support visibility attribute and Darwin's private extern
 734    feature.  */
 735 #undef TARGET_ASM_ASSEMBLE_VISIBILITY
 736 #define TARGET_ASM_ASSEMBLE_VISIBILITY darwin_assemble_visibility
 737
 738 /* Extra attributes for Darwin.  */
 739 #define SUBTARGET_ATTRIBUTE_TABLE                                            \
 740   /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ \
 741   { "apple_kext_compatibility", 0, 0, false, true, false,                    \
 742     darwin_handle_kext_attribute },                                          \
 743   { "weak_import", 0, 0, true, false, false,                                 \
 744     darwin_handle_weak_import_attribute }
 745
 746 #undef ASM_GENERATE_INTERNAL_LABEL
 747 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 748   sprintf (LABEL, "*%s%ld", PREFIX, (long)(NUM))
 749
 750 #undef TARGET_ASM_MARK_DECL_PRESERVED
 751 #define TARGET_ASM_MARK_DECL_PRESERVED darwin_mark_decl_preserved
 752
 753 /* Set on a symbol with SYMBOL_FLAG_FUNCTION or
 754    MACHO_SYMBOL_FLAG_VARIABLE to indicate that the function or
 755    variable has been defined in this translation unit.
 756    When porting Mach-O to new architectures you need to make
 757    sure these aren't clobbered by the backend.  */
 758
 759 #define MACHO_SYMBOL_FLAG_VARIABLE (SYMBOL_FLAG_MACH_DEP)
 760 #define MACHO_SYMBOL_FLAG_DEFINED ((SYMBOL_FLAG_MACH_DEP) << 1)
 761
 762 /* Set on a symbol to indicate when fix-and-continue style code
 763    generation is being used and the symbol refers to a static symbol
 764    that should be rebound from new instances of a translation unit to
 765    the original instance of the data.  */
 766
 767 #define MACHO_SYMBOL_STATIC ((SYMBOL_FLAG_MACH_DEP) << 2)
 768
 769 /* Symbolic names for various things we might know about a symbol.  */
 770
 771 enum machopic_addr_class {
 772   MACHOPIC_UNDEFINED,
 773   MACHOPIC_DEFINED_DATA,
 774   MACHOPIC_UNDEFINED_DATA,
 775   MACHOPIC_DEFINED_FUNCTION,
 776   MACHOPIC_UNDEFINED_FUNCTION
 777 };
 778
 779 /* Macros defining the various PIC cases.  */
 780
 781 #define MACHO_DYNAMIC_NO_PIC_P  (TARGET_DYNAMIC_NO_PIC)
 782 #define MACHOPIC_INDIRECT       (flag_pic || MACHO_DYNAMIC_NO_PIC_P)
 783 #define MACHOPIC_JUST_INDIRECT  (MACHO_DYNAMIC_NO_PIC_P)
 784 #define MACHOPIC_PURE           (flag_pic && ! MACHO_DYNAMIC_NO_PIC_P)
 785
 786 #undef TARGET_ENCODE_SECTION_INFO
 787 #define TARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
 788 #undef TARGET_STRIP_NAME_ENCODING
 789 #define TARGET_STRIP_NAME_ENCODING  default_strip_name_encoding
 790
 791 #define GEN_BINDER_NAME_FOR_STUB(BUF,STUB,STUB_LENGTH)          \
 792   do {                                                          \
 793     const char *const stub_ = (STUB);                           \
 794     char *buffer_ = (BUF);                                      \
 795     strcpy (buffer_, stub_);                                    \
 796     if (stub_[0] == '"')                                        \
 797       {                                                         \
 798         strcpy (buffer_ + (STUB_LENGTH) - 1, "_binder\"");      \
 799       }                                                         \
 800     else                                                        \
 801       {                                                         \
 802         strcpy (buffer_ + (STUB_LENGTH), "_binder");            \
 803       }                                                         \
 804   } while (0)
 805
 806 #define GEN_SYMBOL_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)    \
 807   do {                                                          \
 808     const char *const symbol_ = (SYMBOL);                       \
 809     char *buffer_ = (BUF);                                      \
 810     if (name_needs_quotes (symbol_) && symbol_[0] != '"')       \
 811       {                                                         \
 812           sprintf (buffer_, "\"%s\"", symbol_);                 \
 813       }                                                         \
 814     else                                                        \
 815       {                                                         \
 816         strcpy (buffer_, symbol_);                              \
 817       }                                                         \
 818   } while (0)
 819
 820 /* Given a symbol name string, create the lazy pointer version
 821    of the symbol name.  */
 822
 823 #define GEN_LAZY_PTR_NAME_FOR_SYMBOL(BUF,SYMBOL,SYMBOL_LENGTH)  \
 824   do {                                                          \
 825     const char *symbol_ = (SYMBOL);                             \
 826     char *buffer_ = (BUF);                                      \
 827     if (symbol_[0] == '"')                                      \
 828       {                                                         \
 829         strcpy (buffer_, "\"L");                                \
 830         strcpy (buffer_ + 2, symbol_ + 1);                      \
 831         strcpy (buffer_ + (SYMBOL_LENGTH), "$lazy_ptr\"");      \
 832       }                                                         \
 833     else if (name_needs_quotes (symbol_))                       \
 834       {                                                         \
 835         strcpy (buffer_, "\"L");                                \
 836         strcpy (buffer_ + 2, symbol_);                          \
 837         strcpy (buffer_ + (SYMBOL_LENGTH) + 2, "$lazy_ptr\"");  \
 838       }                                                         \
 839     else                                                        \
 840       {                                                         \
 841         strcpy (buffer_, "L");                                  \
 842         strcpy (buffer_ + 1, symbol_);                          \
 843         strcpy (buffer_ + (SYMBOL_LENGTH) + 1, "$lazy_ptr");    \
 844       }                                                         \
 845   } while (0)
 846
 847 #define EH_FRAME_SECTION_NAME   "__TEXT"
 848 #define EH_FRAME_SECTION_ATTR ",coalesced,no_toc+strip_static_syms+live_support"
 849
 850 /* Java runtime class list.  */
 851 #define JCR_SECTION_NAME "__DATA,jcr,regular,no_dead_strip"
 852
 853 #undef ASM_PREFERRED_EH_DATA_FORMAT
 854 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  \
 855   (((CODE) == 2 && (GLOBAL) == 1) \
 856    ? (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4) : \
 857      ((CODE) == 1 || (GLOBAL) == 0) ? DW_EH_PE_pcrel : DW_EH_PE_absptr)
 858
 859 #define ASM_OUTPUT_DWARF_DELTA(FILE,SIZE,LABEL1,LABEL2)  \
 860   darwin_asm_output_dwarf_delta (FILE, SIZE, LABEL1, LABEL2)
 861
 862 #define ASM_OUTPUT_DWARF_OFFSET(FILE,SIZE,LABEL,BASE)  \
 863   darwin_asm_output_dwarf_offset (FILE, SIZE, LABEL, BASE)
 864
 865 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(ASM_OUT_FILE, ENCODING, SIZE, ADDR, DONE)     \
 866       if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1)) {                            \
 867         darwin_non_lazy_pcrel (ASM_OUT_FILE, ADDR);                                     \
 868         goto DONE;                                                                      \
 869       }
 870
 871 /* Experimentally, putting jump tables in text is faster on SPEC.
 872    Also this is needed for correctness for coalesced functions.  */
 873
 874 #ifndef JUMP_TABLES_IN_TEXT_SECTION
 875 #define JUMP_TABLES_IN_TEXT_SECTION 1
 876 #endif
 877
 878 #define TARGET_TERMINATE_DW2_EH_FRAME_INFO false
 879
 880 #define TARGET_ASM_INIT_SECTIONS darwin_init_sections
 881 #undef TARGET_ASM_NAMED_SECTION
 882 #define TARGET_ASM_NAMED_SECTION darwin_asm_named_section
 883
 884 /* Handle pragma weak and pragma pack.  */
 885 #define HANDLE_SYSV_PRAGMA 1
 886
 887 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
 888
 889 #define DARWIN_REGISTER_TARGET_PRAGMAS()                        \
 890   do {                                                          \
 891     c_register_pragma (0, "mark", darwin_pragma_ignore);        \
 892     c_register_pragma (0, "options", darwin_pragma_options);    \
 893     c_register_pragma (0, "segment", darwin_pragma_ignore);     \
 894     c_register_pragma (0, "unused", darwin_pragma_unused);      \
 895     c_register_pragma (0, "ms_struct", darwin_pragma_ms_struct); \
 896   } while (0)
 897
 898 #undef ASM_APP_ON
 899 #define ASM_APP_ON ""
 900 #undef ASM_APP_OFF
 901 #define ASM_APP_OFF ""
 902
 903 void darwin_register_frameworks (const char *, const char *, int);
 904 void darwin_register_objc_includes (const char *, const char *, int);
 905 #define TARGET_EXTRA_PRE_INCLUDES darwin_register_objc_includes
 906 #define TARGET_EXTRA_INCLUDES darwin_register_frameworks
 907
 908 void add_framework_path (char *);
 909 #define TARGET_OPTF add_framework_path
 910
 911 #define TARGET_POSIX_IO
 912
 913 /* All new versions of Darwin have C99 functions.  */
 914
 915 #define TARGET_C99_FUNCTIONS 1
 916
 917 #define WINT_TYPE "int"
 918
 919 /* Every program on darwin links against libSystem which contains the pthread
 920    routines, so there's no need to explicitly call out when doing threaded
 921    work.  */
 922
 923 #undef GOMP_SELF_SPECS
 924 #define GOMP_SELF_SPECS ""
 925
 926 /* Darwin can't support anchors until we can cope with the adjustments
 927    to size that ASM_DECLARE_OBJECT_NAME and ASM_DECLARE_CONSTANT_NAME
 928    when outputting members of an anchor block and the linker can be
 929    taught to keep them together or we find some other suitable
 930    code-gen technique.  */
 931
 932 #if 0
 933 #define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
 934 #else
 935 #define TARGET_ASM_OUTPUT_ANCHOR NULL
 936 #endif
 937
 938 /* Attempt to turn on execute permission for the stack.  This may be
 939     used by INITIALIZE_TRAMPOLINE of the target needs it (that is,
 940     if the target machine can change execute permissions on a page).
 941
 942     There is no way to query the execute permission of the stack, so
 943     we always issue the mprotect() call.
 944
 945     Unfortunately it is not possible to make this namespace-clean.
 946
 947     Also note that no errors should be emitted by this code; it is
 948     considered dangerous for library calls to send messages to
 949     stdout/stderr.  */
 950
 951 #define ENABLE_EXECUTE_STACK                                            \
 952 extern void __enable_execute_stack (void *);                            \
 953 void                                                                    \
 954 __enable_execute_stack (void *addr)                                     \
 955 {                                                                       \
 956    extern int mprotect (void *, size_t, int);                           \
 957    extern int getpagesize (void);                                       \
 958    static int size;                                                     \
 959    static long mask;                                                    \
 960                                                                         \
 961    char *page, *end;                                                    \
 962                                                                         \
 963    if (size == 0)                                                       \
 964      {                                                                  \
 965        size = getpagesize();                                            \
 966        mask = ~((long) size - 1);                                       \
 967      }                                                                  \
 968                                                                         \
 969    page = (char *) (((long) addr) & mask);                              \
 970    end  = (char *) ((((long) (addr + (TARGET_64BIT ? 48 : 40))) & mask) + size); \
 971                                                                         \
 972    /* 7 == PROT_READ | PROT_WRITE | PROT_EXEC */                        \
 973    (void) mprotect (page, end - page, 7);                               \
 974 }
 975
 976 /* For Apple KEXTs, we make the constructors return this to match gcc
 977    2.95.  */
 978 #define TARGET_CXX_CDTOR_RETURNS_THIS (darwin_kextabi_p)
 979 extern int flag_mkernel;
 980 extern int flag_apple_kext;
 981 #define TARGET_KEXTABI flag_apple_kext
 982
 983 #endif /* CONFIG_DARWIN_H */