gcc/config/arm/symbian.h

   1 /* Configuration file for Symbian OS on ARM processors.
   2    Copyright (C) 2004-2022 Free Software Foundation, Inc.
   3    Contributed by CodeSourcery, LLC
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published
   9    by the Free Software Foundation; either version 3, or (at your
  10    option) any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GCC; see the file COPYING3.  If not see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 /* Do not expand builtin functions (unless explicitly prefixed with
  22    "__builtin").  Symbian OS code relies on properties of the standard
  23    library that go beyond those guaranteed by the ANSI/ISO standard.
  24    For example, "memcpy" works even with overlapping memory, like
  25    "memmove".  We cannot simply set flag_no_builtin in arm.c because
  26    (a) flag_no_builtin is not declared in language-independent code,
  27    and (b) that would prevent users from explicitly overriding the
  28    default with -fbuiltin, which may sometimes be useful.
  29
  30    Make all symbols hidden by default.  Symbian OS expects that all
  31    exported symbols will be explicitly marked with
  32    "__declspec(dllexport)".
  33
  34    Enumeration types use 4 bytes, even if the enumerals are small,
  35    unless explicitly overridden.
  36
  37    The wchar_t type is a 2-byte type, unless explicitly
  38    overridden.  */
  39 #define CC1_SPEC                                                \
  40   "%{!fbuiltin:%{!fno-builtin:-fno-builtin}} "                  \
  41   "%{!fvisibility=*:-fvisibility=hidden} "                      \
  42   "%{!fshort-enums:%{!fno-short-enums:-fno-short-enums}} "      \
  43   "%{!fshort-wchar:%{!fno-short-wchar:-fshort-wchar}} "
  44 #define CC1PLUS_SPEC CC1_SPEC
  45
  46 /* Symbian OS does not use crt*.o, unlike the generic unknown-elf
  47    configuration.  */
  48 #undef STARTFILE_SPEC
  49 #define STARTFILE_SPEC ""
  50
  51 #undef ENDFILE_SPEC
  52 #define ENDFILE_SPEC ""
  53
  54 /* Do not link with any libraries by default.  On Symbian OS, the user
  55    must supply all required libraries on the command line.  */
  56 #undef LIB_SPEC
  57 #define LIB_SPEC ""
  58
  59 /* Support the "dllimport" attribute.  */
  60 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 1
  61
  62 /* The assembler should assume VFP FPU format, and armv5t.  */
  63 #undef SUBTARGET_ASM_FLOAT_SPEC
  64 #define SUBTARGET_ASM_FLOAT_SPEC \
  65   "%{!mfpu=*:-mfpu=vfp} %{!mcpu=*:%{!march=*:-march=armv5t}}"
  66
  67 /* Define the __symbian__ macro.  */
  68 #undef TARGET_OS_CPP_BUILTINS
  69 #define TARGET_OS_CPP_BUILTINS()                                \
  70   do                                                            \
  71     {                                                           \
  72       /* Include the default BPABI stuff.  */                   \
  73       TARGET_BPABI_CPP_BUILTINS ();                             \
  74       /* Symbian OS does not support merging symbols across DLL \
  75          boundaries.  */                                        \
  76       builtin_define ("__GXX_MERGED_TYPEINFO_NAMES=0");         \
  77       builtin_define ("__symbian__");                           \
  78     }                                                           \
  79   while (false)
  80
  81 /* On SymbianOS, these sections are not writable, so we use "a",
  82    rather than "aw", for the section attributes.  */
  83 #undef ARM_EABI_CTORS_SECTION_OP
  84 #define ARM_EABI_CTORS_SECTION_OP \
  85   "\t.section\t.init_array,\"a\",%init_array"
  86 #undef ARM_EABI_DTORS_SECTION_OP
  87 #define ARM_EABI_DTORS_SECTION_OP \
  88   "\t.section\t.fini_array,\"a\",%fini_array"
  89
  90 /* SymbianOS cannot merge entities with vague linkage at runtime.  */
  91 #define TARGET_ARM_DYNAMIC_VAGUE_LINKAGE_P false
  92
  93 #define TARGET_DEFAULT_WORD_RELOCATIONS 1
  94
  95 #define ARM_TARGET2_DWARF_FORMAT DW_EH_PE_absptr