gcc/config/arm/symbian.h

   1 /* Configuration file for Symbian OS on ARM processors.
   2    Copyright (C) 2004, 2005, 2007, 2008
   3    Free Software Foundation, Inc.
   4    Contributed by CodeSourcery, LLC
   5
   6    This file is part of GCC.
   7
   8    GCC is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published
  10    by the Free Software Foundation; either version 3, or (at your
  11    option) any later version.
  12
  13    GCC is distributed in the hope that it will be useful, but WITHOUT
  14    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  16    License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GCC; see the file COPYING3.  If not see
  20    <http://www.gnu.org/licenses/>.  */
  21
  22 /* Do not expand builtin functions (unless explicitly prefixed with
  23    "__builtin").  Symbian OS code relies on properties of the standard
  24    library that go beyond those guaranteed by the ANSI/ISO standard.
  25    For example, "memcpy" works even with overlapping memory, like
  26    "memmove".  We cannot simply set flag_no_builtin in arm.c because
  27    (a) flag_no_builtin is not declared in language-independent code,
  28    and (b) that would prevent users from explicitly overriding the
  29    default with -fbuiltin, which may sometimes be useful.
  30
  31    Make all symbols hidden by default.  Symbian OS expects that all
  32    exported symbols will be explicitly marked with
  33    "__declspec(dllexport)".
  34
  35    Enumeration types use 4 bytes, even if the enumerals are small,
  36    unless explicitly overridden.
  37
  38    The wchar_t type is a 2-byte type, unless explicitly
  39    overridden.  */
  40 #define CC1_SPEC                                                \
  41   "%{!fbuiltin:%{!fno-builtin:-fno-builtin}} "                  \
  42   "%{!fvisibility=*:-fvisibility=hidden} "                      \
  43   "%{!fshort-enums:%{!fno-short-enums:-fno-short-enums}} "      \
  44   "%{!fshort-wchar:%{!fno-short-wchar:-fshort-wchar}} "
  45 #define CC1PLUS_SPEC CC1_SPEC
  46
  47 /* Symbian OS does not use crt*.o, unlike the generic unknown-elf
  48    configuration.  */
  49 #undef STARTFILE_SPEC
  50 #define STARTFILE_SPEC ""
  51
  52 #undef ENDFILE_SPEC
  53 #define ENDFILE_SPEC ""
  54
  55 /* Do not link with any libraries by default.  On Symbian OS, the user
  56    must supply all required libraries on the command line.  */
  57 #undef LIB_SPEC
  58 #define LIB_SPEC ""
  59
  60 /* Support the "dllimport" attribute.  */
  61 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 1
  62
  63 /* Symbian OS assumes ARM V5 or above.  Since -march=armv5 is
  64    equivalent to making the ARM 10TDMI core the default, we can set
  65    SUBTARGET_CPU_DEFAULT and get an equivalent effect.  */
  66 #undef SUBTARGET_CPU_DEFAULT
  67 #define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm10tdmi
  68
  69 /* The assembler should assume VFP FPU format, and armv5t.  */
  70 #undef SUBTARGET_ASM_FLOAT_SPEC
  71 #define SUBTARGET_ASM_FLOAT_SPEC \
  72   "%{!mfpu=*:-mfpu=vfp} %{!mcpu=*:%{!march=*:-march=armv5t}}"
  73
  74 /* SymbianOS provides the BPABI routines in a separate library.
  75    Therefore, we do not need to define any of them in libgcc.  */
  76 #undef RENAME_LIBRARY
  77 #define RENAME_LIBRARY(GCC_NAME, AEABI_NAME) /* empty */
  78
  79 /* Define the __symbian__ macro.  */
  80 #undef TARGET_OS_CPP_BUILTINS
  81 #define TARGET_OS_CPP_BUILTINS()                                \
  82   do                                                            \
  83     {                                                           \
  84       /* Include the default BPABI stuff.  */                   \
  85       TARGET_BPABI_CPP_BUILTINS ();                             \
  86       /* Symbian OS does not support merging symbols across DLL \
  87          boundaries.  */                                        \
  88       builtin_define ("__GXX_MERGED_TYPEINFO_NAMES=0");         \
  89       builtin_define ("__symbian__");                           \
  90     }                                                           \
  91   while (false)
  92
  93 /* On SymbianOS, these sections are not writable, so we use "a",
  94    rather than "aw", for the section attributes.  */
  95 #undef ARM_EABI_CTORS_SECTION_OP
  96 #define ARM_EABI_CTORS_SECTION_OP \
  97   "\t.section\t.init_array,\"a\",%init_array"
  98 #undef ARM_EABI_DTORS_SECTION_OP
  99 #define ARM_EABI_DTORS_SECTION_OP \
 100   "\t.section\t.fini_array,\"a\",%fini_array"
 101
 102 /* SymbianOS cannot merge entities with vague linkage at runtime.  */
 103 #define TARGET_ARM_DYNAMIC_VAGUE_LINKAGE_P false
 104
 105 #define TARGET_DEFAULT_WORD_RELOCATIONS 1