gcc/config/arm/symbian.h

/* Configuration file for Symbian OS on ARM processors.
   Copyright (C) 2004-2021 Free Software Foundation, Inc.
   Contributed by CodeSourcery, LLC   

   This file is part of GCC.

   GCC is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published
   by the Free Software Foundation; either version 3, or (at your
   option) any later version.

   GCC is distributed in the hope that it will be useful, but WITHOUT
   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
   License for more details.

   You should have received a copy of the GNU General Public License
   along with GCC; see the file COPYING3.  If not see
   <http://www.gnu.org/licenses/>.  */

/* Do not expand builtin functions (unless explicitly prefixed with
   "__builtin").  Symbian OS code relies on properties of the standard
   library that go beyond those guaranteed by the ANSI/ISO standard.
   For example, "memcpy" works even with overlapping memory, like
   "memmove".  We cannot simply set flag_no_builtin in arm.c because
   (a) flag_no_builtin is not declared in language-independent code,
   and (b) that would prevent users from explicitly overriding the
   default with -fbuiltin, which may sometimes be useful.

   Make all symbols hidden by default.  Symbian OS expects that all
   exported symbols will be explicitly marked with
   "__declspec(dllexport)".  

   Enumeration types use 4 bytes, even if the enumerals are small,
   unless explicitly overridden.

   The wchar_t type is a 2-byte type, unless explicitly
   overridden.  */
#define CC1_SPEC						\
  "%{!fbuiltin:%{!fno-builtin:-fno-builtin}} "			\
  "%{!fvisibility=*:-fvisibility=hidden} "			\
  "%{!fshort-enums:%{!fno-short-enums:-fno-short-enums}} "	\
  "%{!fshort-wchar:%{!fno-short-wchar:-fshort-wchar}} "
#define CC1PLUS_SPEC CC1_SPEC

/* Symbian OS does not use crt*.o, unlike the generic unknown-elf
   configuration.  */
#undef STARTFILE_SPEC
#define STARTFILE_SPEC ""

#undef ENDFILE_SPEC
#define ENDFILE_SPEC ""

/* Do not link with any libraries by default.  On Symbian OS, the user
   must supply all required libraries on the command line.  */
#undef LIB_SPEC
#define LIB_SPEC ""

/* Support the "dllimport" attribute.  */
#define TARGET_DLLIMPORT_DECL_ATTRIBUTES 1

/* The assembler should assume VFP FPU format, and armv5t.  */
#undef SUBTARGET_ASM_FLOAT_SPEC
#define SUBTARGET_ASM_FLOAT_SPEC \
  "%{!mfpu=*:-mfpu=vfp} %{!mcpu=*:%{!march=*:-march=armv5t}}"
  
/* Define the __symbian__ macro.  */
#undef TARGET_OS_CPP_BUILTINS
#define TARGET_OS_CPP_BUILTINS()				\
  do								\
    {								\
      /* Include the default BPABI stuff.  */			\
      TARGET_BPABI_CPP_BUILTINS ();				\
      /* Symbian OS does not support merging symbols across DLL	\
	 boundaries.  */					\
      builtin_define ("__GXX_MERGED_TYPEINFO_NAMES=0");		\
      builtin_define ("__symbian__");				\
    }								\
  while (false)

/* On SymbianOS, these sections are not writable, so we use "a",
   rather than "aw", for the section attributes.  */
#undef ARM_EABI_CTORS_SECTION_OP
#define ARM_EABI_CTORS_SECTION_OP \
  "\t.section\t.init_array,\"a\",%init_array"
#undef ARM_EABI_DTORS_SECTION_OP
#define ARM_EABI_DTORS_SECTION_OP \
  "\t.section\t.fini_array,\"a\",%fini_array"

/* SymbianOS cannot merge entities with vague linkage at runtime.  */
#define TARGET_ARM_DYNAMIC_VAGUE_LINKAGE_P false

#define TARGET_DEFAULT_WORD_RELOCATIONS 1

#define ARM_TARGET2_DWARF_FORMAT DW_EH_PE_absptr