gcc/config/arm/symbian.h

   1 /* Configuration file for Symbian OS on ARM processors.
   2    Copyright (C) 2004, 2005
   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 2, 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 COPYING.  If not, write to
  20    the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  21    Boston, MA 02110-1301, USA.  */
  22
  23 /* Do not expand builtin functions (unless explicitly prefixed with
  24    "__builtin").  Symbian OS code relies on properties of the standard
  25    library that go beyond those guaranteed by the ANSI/ISO standard.
  26    For example, "memcpy" works even with overlapping memory, like
  27    "memmove".  We cannot simply set flag_no_builtin in arm.c because
  28    (a) flag_no_builtin is not declared in language-independent code,
  29    and (b) that would prevent users from explicitly overriding the
  30    default with -fbuiltin, which may sometimes be useful.
  31
  32    Make all symbols hidden by default.  Symbian OS expects that all
  33    exported symbols will be explicitly marked with
  34    "__declspec(dllexport)".
  35
  36    Enumeration types use 4 bytes, even if the enumerals are small,
  37    unless explicitly overridden.
  38
  39    The wchar_t type is a 2-byte type, unless explicitly
  40    overridden.  */
  41 #define CC1_SPEC                                                \
  42   "%{!fbuiltin:%{!fno-builtin:-fno-builtin}} "                  \
  43   "%{!fvisibility=*:-fvisibility=hidden} "                      \
  44   "%{!fshort-enums:%{!fno-short-enums:-fno-short-enums}} "      \
  45   "%{!fshort-wchar:%{!fno-short-wchar:-fshort-wchar}} "
  46 #define CC1PLUS_SPEC CC1_SPEC
  47
  48 /* Symbian OS does not use crt*.o, unlike the generic unknown-elf
  49    configuration.  */
  50 #undef STARTFILE_SPEC
  51 #define STARTFILE_SPEC ""
  52
  53 #undef ENDFILE_SPEC
  54 #define ENDFILE_SPEC ""
  55
  56 /* Do not link with any libraries by default.  On Symbian OS, the user
  57    must supply all required libraries on the command line.  */
  58 #undef LIB_SPEC
  59 #define LIB_SPEC ""
  60
  61 /* Support the "dllimport" attribute.  */
  62 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 1
  63
  64 /* Symbian OS assumes ARM V5 or above.  Since -march=armv5 is
  65    equivalent to making the ARM 10TDMI core the default, we can set
  66    SUBTARGET_CPU_DEFAULT and get an equivalent effect.  */
  67 #undef SUBTARGET_CPU_DEFAULT
  68 #define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm10tdmi
  69
  70 /* The assembler should assume VFP FPU format, and armv5t.  */
  71 #undef SUBTARGET_ASM_FLOAT_SPEC
  72 #define SUBTARGET_ASM_FLOAT_SPEC \
  73   "%{!mfpu=*:-mfpu=vfp} %{!mcpu=*:%{!march=*:-march=armv5t}}"
  74
  75 /* SymbianOS provides the BPABI routines in a separate library.
  76    Therefore, we do not need to define any of them in libgcc.  */
  77 #undef RENAME_LIBRARY
  78 #define RENAME_LIBRARY(GCC_NAME, AEABI_NAME) /* empty */
  79
  80 /* Define the __symbian__ macro.  */
  81 #undef TARGET_OS_CPP_BUILTINS
  82 #define TARGET_OS_CPP_BUILTINS()                \
  83   do                                            \
  84     {                                           \
  85       /* Include the default BPABI stuff.  */   \
  86       TARGET_BPABI_CPP_BUILTINS ();             \
  87       builtin_define ("__symbian__");           \
  88     }                                           \
  89   while (false)
  90
  91 /* On SymbianOS, these sections are not writable, so we use "a",
  92    rather than "aw", for the section attributes.  */
  93 #undef ARM_EABI_CTORS_SECTION_OP
  94 #define ARM_EABI_CTORS_SECTION_OP \
  95   "\t.section\t.init_array,\"a\",%init_array"
  96 #undef ARM_EABI_DTORS_SECTION_OP
  97 #define ARM_EABI_DTORS_SECTION_OP \
  98   "\t.section\t.fini_array,\"a\",%fini_array"
  99
 100 /* SymbianOS cannot merge entities with vague linkage at runtime.  */
 101 #define TARGET_ARM_DYNAMIC_VAGUE_LINKAGE_P false