gcc/config/i386/isc.h

   1 /* Assembler-independent definitions for an Intel 386 running
   2    Interactive Unix System V. Specifically, this is for recent versions
   3    that support POSIX.  */
   4
   5 /* Use crt1.o, not crt0.o, as a startup file, and crtn.o as a closing file. */
   6 #undef STARTFILE_SPEC
   7 #define STARTFILE_SPEC \
   8   "%{!shlib:%{posix:%{pg:mcrtp1.o%s}%{!pg:%{p:mcrtp1.o%s}%{!p:crtp1.o%s}}}\
   9    %{Xp:%{pg:mcrtp1.o%s}%{!pg:%{p:mcrtp1.o%s}%{!p:crtp1.o%s}}}\
  10    %{!posix:%{!Xp:%{pg:mcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}\
  11    %{p:-L/lib/libp} %{pg:-L/lib/libp}}}}\
  12    %{shlib:%{Xp:crtp1.o%s}%{posix:crtp1.o%s}%{!posix:%{!Xp:crt1.o%s}}}\
  13    crtbegin.o%s"
  14
  15 #define ENDFILE_SPEC "crtend.o%s crtn.o%s"
  16
  17 /* Library spec */
  18 #undef LIB_SPEC
  19 #define LIB_SPEC "%{shlib:-lc_s} %{posix:-lcposix} %{Xp:-lcposix} -lc -lg"
  20
  21 #undef CPP_SPEC
  22 #define CPP_SPEC "%(cpp_cpu) %{posix:-D_POSIX_SOURCE} %{Xp:-D_POSIX_SOURCE}"
  23
  24 /* ISC 2.2 uses `char' for `wchar_t'.  */
  25 #undef WCHAR_TYPE
  26 #define WCHAR_TYPE "char"
  27
  28 #undef WCHAR_TYPE_SIZE
  29 #define WCHAR_TYPE_SIZE BITS_PER_UNIT
  30
  31 #if 0
  32 /* This is apparently not true: ISC versions up to 3.0, at least, use
  33    the standard calling sequence in which the called function pops the
  34    extra arg.  */
  35 /* caller has to pop the extra argument passed to functions that return
  36    structures. */
  37
  38 #undef RETURN_POPS_ARGS
  39 #define RETURN_POPS_ARGS(FUNDECL,FUNTYPE,SIZE)   \
  40   ((FUNDECL) && TREE_CODE (FUNDECL) == IDENTIFIER_NODE ? 0      \
  41    : (TARGET_RTD                                                \
  42       && (TYPE_ARG_TYPES (FUNTYPE) == 0                         \
  43           || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (FUNTYPE))) \
  44               == void_type_node))) ? (SIZE)                     \
  45    : 0)
  46 /* On other 386 systems, the last line looks like this:
  47    : (aggregate_value_p (TREE_TYPE (FUNTYPE))) ? GET_MODE_SIZE (Pmode) : 0)  */
  48 #endif
  49
  50 /* Handle #pragma pack and #pragma weak.  */
  51 #define HANDLE_SYSV_PRAGMA
  52
  53 /* By default, target has a 80387, uses IEEE compatible arithmetic,
  54    and returns float values in the 387, ie,
  55    (TARGET_80387 | TARGET_FLOAT_RETURNS_IN_80387)
  56
  57    ISC's software emulation of a 387 fails to handle the `fucomp'
  58    opcode.  fucomp is only used when generating IEEE compliant code.
  59    So don't make TARGET_IEEE_FP default for ISC. */
  60
  61 #undef TARGET_DEFAULT
  62 #define TARGET_DEFAULT (MASK_80387 | MASK_FLOAT_RETURNS)
  63
  64 /* The ISC 2.0.2 software FPU emulator apparently can't handle
  65    80-bit XFmode insns, so don't generate them.  */
  66 #undef LONG_DOUBLE_TYPE_SIZE
  67 #define LONG_DOUBLE_TYPE_SIZE 64
  68
  69 /* The ISC assembler does not like a .file directive with a name
  70    longer than 14 characters.  Truncating it will not permit
  71    debugging to work properly, but at least we won't get an error
  72    message.  */
  73
  74 #undef ASM_FILE_START
  75 #define ASM_FILE_START(FILE)                            \
  76   do {                                                  \
  77     int len = strlen (main_input_filename);             \
  78     char *na = main_input_filename + len;               \
  79     char shorter[15];                                   \
  80     /* NA gets MAIN_INPUT_FILENAME sans directory names.  */\
  81     while (na > main_input_filename)                    \
  82       {                                                 \
  83         if (na[-1] == '/')                              \
  84           break;                                        \
  85         na--;                                           \
  86       }                                                 \
  87     strncpy (shorter, na, 14);                          \
  88     shorter[14] = 0;                                    \
  89     fprintf (FILE, "\t.file\t");                        \
  90     output_quoted_string (FILE, shorter);               \
  91     fprintf (FILE, "\n");                               \
  92   } while (0)
  93
  94 /* Work around assembler forward label references generated in exception
  95    handling code. */
  96 #define DWARF2_UNWIND_INFO 0