gcc/config/m68k/m68kemb.h

   1 /* Definitions of target machine for GNU compiler.  "embedded" 68XXX.
   2    This is meant to be included after m68k.h.
   3    Copyright (C) 1994, 1995, 1998, 1999, 2004, 2006
   4    Free Software Foundation, Inc.  */
   5
   6 /* Override the SVR4 ABI for this target.  */
   7
   8 #define PTRDIFF_TYPE "long int"
   9 #define SIZE_TYPE "long unsigned int"
  10
  11 /* In order for bitfields to work on a 68000, or with -mnobitfield, we must
  12    define either PCC_BITFIELD_TYPE_MATTERS or STRUCTURE_SIZE_BOUNDARY.
  13    Defining STRUCTURE_SIZE_BOUNDARY results in structure packing problems,
  14    so we define PCC_BITFIELD_TYPE_MATTERS.  */
  15 #define PCC_BITFIELD_TYPE_MATTERS 1
  16
  17 /* Don't default to pcc-struct-return, so that we can return small structures
  18    and unions in registers, which is slightly more efficient.  */
  19 #define DEFAULT_PCC_STRUCT_RETURN 0
  20
  21 #undef FUNCTION_VALUE
  22 #define FUNCTION_VALUE(VALTYPE,FUNC) LIBCALL_VALUE (TYPE_MODE (VALTYPE))
  23
  24 #undef LIBCALL_VALUE
  25 #define LIBCALL_VALUE(MODE)                                     \
  26   m68k_libcall_value (MODE)
  27
  28 #undef FUNCTION_VALUE_REGNO_P
  29 #define FUNCTION_VALUE_REGNO_P(N)                       \
  30   ((N) == D0_REG || (TARGET_68881 && (N) == FP0_REG))
  31
  32 #undef NEEDS_UNTYPED_CALL
  33 #define NEEDS_UNTYPED_CALL 1
  34
  35 /* Target OS builtins.  */
  36 #define TARGET_OS_CPP_BUILTINS()                \
  37   do                                            \
  38     {                                           \
  39       builtin_define ("__embedded__");          \
  40     }                                           \
  41   while (0)
  42
  43 /* Override the default LIB_SPEC from gcc.c.  We don't currently support
  44    profiling, or libg.a.  */
  45
  46 #undef  LIB_SPEC
  47 #define LIB_SPEC "-lc"
  48
  49 /* Make this be null, since we want the crt0.o to come from the linker
  50    script */
  51
  52 #undef  STARTFILE_SPEC
  53 #define STARTFILE_SPEC ""