gcc/config/alpha/linux.h

   1 /* Definitions of target machine for GNU compiler,
   2    for Alpha Linux-based GNU systems.
   3    Copyright (C) 1996-2020 Free Software Foundation, Inc.
   4    Contributed by Richard Henderson.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GCC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #define TARGET_OS_CPP_BUILTINS()                                \
  23     do {                                                        \
  24         builtin_define ("__gnu_linux__");                       \
  25         builtin_define ("_LONGLONG");                           \
  26         builtin_define_std ("linux");                           \
  27         builtin_define_std ("unix");                            \
  28         builtin_assert ("system=linux");                        \
  29         builtin_assert ("system=unix");                         \
  30         builtin_assert ("system=posix");                        \
  31         /* The GNU C++ standard library requires this.  */      \
  32         if (c_dialect_cxx ())                                   \
  33           builtin_define ("_GNU_SOURCE");                       \
  34     } while (0)
  35
  36 #undef LIB_SPEC
  37 #define LIB_SPEC \
  38   "%{pthread:-lpthread} \
  39    %{shared:-lc} \
  40    %{!shared: %{profile:-lc_p}%{!profile:-lc}}"
  41
  42 #undef CPP_SPEC
  43 #define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
  44
  45 /* Show that we need a GP when profiling.  */
  46 #undef TARGET_PROFILING_NEEDS_GP
  47 #define TARGET_PROFILING_NEEDS_GP 1
  48
  49 /* Don't care about faults in the prologue.  */
  50 #undef TARGET_CAN_FAULT_IN_PROLOGUE
  51 #define TARGET_CAN_FAULT_IN_PROLOGUE 1
  52
  53 /* OS fixes up EV5 data fault on prefetch.  */
  54 #undef TARGET_FIXUP_EV5_PREFETCH
  55 #define TARGET_FIXUP_EV5_PREFETCH 1
  56
  57 #undef WCHAR_TYPE
  58 #define WCHAR_TYPE "int"
  59
  60 #ifdef SINGLE_LIBC
  61 #define OPTION_GLIBC  (DEFAULT_LIBC == LIBC_GLIBC)
  62 #define OPTION_UCLIBC (DEFAULT_LIBC == LIBC_UCLIBC)
  63 #define OPTION_BIONIC (DEFAULT_LIBC == LIBC_BIONIC)
  64 #undef OPTION_MUSL
  65 #define OPTION_MUSL   (DEFAULT_LIBC == LIBC_MUSL)
  66 #else
  67 #define OPTION_GLIBC  (linux_libc == LIBC_GLIBC)
  68 #define OPTION_UCLIBC (linux_libc == LIBC_UCLIBC)
  69 #define OPTION_BIONIC (linux_libc == LIBC_BIONIC)
  70 #undef OPTION_MUSL
  71 #define OPTION_MUSL   (linux_libc == LIBC_MUSL)
  72 #endif
  73
  74 /* Determine what functions are present at the runtime;
  75    this includes full c99 runtime and sincos.  */
  76 #undef TARGET_LIBC_HAS_FUNCTION
  77 #define TARGET_LIBC_HAS_FUNCTION linux_libc_has_function
  78
  79 #define TARGET_POSIX_IO
  80
  81 /* Provide a STARTFILE_SPEC appropriate for ELF.  Here we add the
  82    (even more) magical crtbegin.o file which provides part of the
  83    support for getting C++ file-scope static object constructed
  84    before entering `main'.  */
  85
  86 #undef  STARTFILE_SPEC
  87 #ifdef HAVE_LD_PIE
  88 #define STARTFILE_SPEC \
  89   "%{!shared: %{pg|p:gcrt1.o%s;pie:Scrt1.o%s;:crt1.o%s}}\
  90    crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
  91 #else
  92 #define STARTFILE_SPEC \
  93   "%{!shared: %{pg|p:gcrt1.o%s;:crt1.o%s}}\
  94    crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
  95 #endif
  96
  97 /* Provide a ENDFILE_SPEC appropriate for ELF.  Here we tack on the
  98    magical crtend.o file which provides part of the support for
  99    getting C++ file-scope static object constructed before entering
 100    `main', followed by a normal ELF "finalizer" file, `crtn.o'.  */
 101
 102 #undef  ENDFILE_SPEC
 103 #define ENDFILE_SPEC \
 104   "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
 105    %{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
 106
 107 #define LINK_GCC_C_SEQUENCE_SPEC \
 108   "%{static|static-pie:--start-group} %G %{!nolibc:%L} \
 109    %{static|static-pie:--end-group}%{!static:%{!static-pie:%G}}"
 110
 111 /* Use --as-needed -lgcc_s for eh support.  */
 112 #ifdef HAVE_LD_AS_NEEDED
 113 #define USE_LD_AS_NEEDED 1
 114 #endif
 115
 116 /* Define if long doubles should be mangled as 'g'.  */
 117 #define TARGET_ALTERNATE_LONG_DOUBLE_MANGLING
 118
 119 /* -mcpu=native handling only makes sense with compiler running on
 120    an Alpha chip.  */
 121 #if defined(__alpha__) || defined(__alpha)
 122 extern const char *host_detect_local_cpu (int argc, const char **argv);
 123 # define EXTRA_SPEC_FUNCTIONS                                           \
 124   { "local_cpu_detect", host_detect_local_cpu },
 125
 126 # define MCPU_MTUNE_NATIVE_SPECS                                        \
 127    " %{mcpu=native:%<mcpu=native %:local_cpu_detect(cpu)}"              \
 128    " %{mtune=native:%<mtune=native %:local_cpu_detect(tune)}"
 129 #else
 130 # define MCPU_MTUNE_NATIVE_SPECS ""
 131 #endif
 132
 133 #define DRIVER_SELF_SPECS MCPU_MTUNE_NATIVE_SPECS