1  /* Configuration file for Symbian OS on ARM processors.
       2     Copyright (C) 2004-2023 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.cc 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