gcc/config/vxworks.h

   1 /* Common VxWorks target definitions for GNU compiler.
   2    Copyright (C) 1999-2014 Free Software Foundation, Inc.
   3    Contributed by Wind River Systems.
   4    Rewritten by CodeSourcery, LLC.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 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 /* Assert that we are targeting VxWorks.  */
  23 #undef TARGET_VXWORKS
  24 #define TARGET_VXWORKS 1
  25
  26 /* In kernel mode, VxWorks provides all the libraries itself, as well as
  27    the functionality of startup files, etc.  In RTP mode, it behaves more
  28    like a traditional Unix, with more external files.  Most of our specs
  29    must be aware of the difference.  */
  30
  31 /* We look for the VxWorks header files using the environment
  32    variables that are set in VxWorks to indicate the location of the
  33    system header files.  We use -idirafter so that the GCC's own
  34    header-file directories (containing <stddef.h>, etc.) come before
  35    the VxWorks system header directories.  */
  36
  37 /* Since we provide a default -isystem, expand -isystem on the command
  38    line early.  */
  39 #undef VXWORKS_ADDITIONAL_CPP_SPEC
  40 #define VXWORKS_ADDITIONAL_CPP_SPEC             \
  41  "%{!nostdinc:                                  \
  42     %{isystem*} -idirafter                      \
  43     %{mrtp: %:getenv(WIND_USR /h)               \
  44       ;:    %:getenv(WIND_BASE /target/h)}}"
  45
  46 /* The references to __init and __fini will be satisfied by
  47    libc_internal.a.  */
  48 #undef VXWORKS_LIB_SPEC
  49 #define VXWORKS_LIB_SPEC                                                \
  50 "%{mrtp:%{shared:-u " USER_LABEL_PREFIX "__init -u " USER_LABEL_PREFIX "__fini} \
  51         %{!shared:%{non-static:-u " USER_LABEL_PREFIX "_STI__6__rtld -ldl} \
  52                   --start-group -lc -lgcc -lc_internal -lnet -ldsi      \
  53                   --end-group}}"
  54
  55 /* The no-op spec for "-shared" below is present because otherwise GCC
  56    will treat it as an unrecognized option.  */
  57 #undef VXWORKS_LINK_SPEC
  58 #define VXWORKS_LINK_SPEC                               \
  59 "%{!mrtp:-r}                                            \
  60  %{!shared:                                             \
  61    %{mrtp:-q %{h*}                                      \
  62           %{R*} %{!T*: %(link_start) }                  \
  63           %(link_target) %(link_os)}}                   \
  64  %{v:-v}                                                \
  65  %{shared:-shared}                                      \
  66  %{Bstatic:-Bstatic}                                    \
  67  %{Bdynamic:-Bdynamic}                                  \
  68  %{!Xbind-lazy:-z now}                                  \
  69  %{Xbind-now:%{Xbind-lazy:                              \
  70    %e-Xbind-now and -Xbind-lazy are incompatible}}      \
  71  %{mrtp:%{!shared:%{!non-static:-static}                \
  72                   %{non-static:--force-dynamic --export-dynamic}}}"
  73
  74 /* For VxWorks, the system provides libc_internal.a.  This is a superset
  75    of libgcc.a; we want to use it.  Make sure not to dynamically export
  76    any of its symbols, though.  Always look for libgcc.a first so that
  77    we get the latest versions of the GNU intrinsics during our builds.  */
  78 #undef VXWORKS_LIBGCC_SPEC
  79 #define VXWORKS_LIBGCC_SPEC \
  80   "-lgcc %{mrtp:--exclude-libs=libc_internal,libgcc -lc_internal}"
  81
  82 #undef VXWORKS_STARTFILE_SPEC
  83 #define VXWORKS_STARTFILE_SPEC "%{mrtp:%{!shared:-l:crt0.o}}"
  84 #define VXWORKS_ENDFILE_SPEC ""
  85
  86 /* Do VxWorks-specific parts of TARGET_OPTION_OVERRIDE.  */
  87 #undef VXWORKS_OVERRIDE_OPTIONS
  88 #define VXWORKS_OVERRIDE_OPTIONS vxworks_override_options ()
  89 extern void vxworks_override_options (void);
  90
  91 /* Only RTPs support prioritized constructors and destructors:
  92    the implementation relies on numbered .ctors* sections.  */
  93 #define SUPPORTS_INIT_PRIORITY TARGET_VXWORKS_RTP
  94
  95 /* VxWorks requires special handling of constructors and destructors.
  96    All VxWorks configurations must use these functions.  */
  97 #undef TARGET_ASM_CONSTRUCTOR
  98 #define TARGET_ASM_CONSTRUCTOR vxworks_asm_out_constructor
  99 #undef TARGET_ASM_DESTRUCTOR
 100 #define TARGET_ASM_DESTRUCTOR vxworks_asm_out_destructor
 101 extern void vxworks_asm_out_constructor (rtx symbol, int priority);
 102 extern void vxworks_asm_out_destructor (rtx symbol, int priority);
 103
 104 /* Override the vxworks-dummy.h definitions.  TARGET_VXWORKS_RTP
 105    is defined by vxworks.opt.  */
 106 #undef VXWORKS_GOTT_BASE
 107 #define VXWORKS_GOTT_BASE "__GOTT_BASE__"
 108 #undef VXWORKS_GOTT_INDEX
 109 #define VXWORKS_GOTT_INDEX "__GOTT_INDEX__"
 110
 111 #undef PTRDIFF_TYPE
 112 #define PTRDIFF_TYPE "int"
 113
 114 #undef SIZE_TYPE
 115 #define SIZE_TYPE "unsigned int"
 116
 117 #undef TARGET_LIBC_HAS_FUNCTION
 118 #define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function
 119
 120 /* Both kernels and RTPs have the facilities required by this macro.  */
 121 #define TARGET_POSIX_IO
 122
 123 /* A VxWorks implementation of TARGET_OS_CPP_BUILTINS.  */
 124 #define VXWORKS_OS_CPP_BUILTINS()                                       \
 125   do                                                                    \
 126     {                                                                   \
 127       builtin_define ("__vxworks");                                     \
 128       builtin_define ("__VXWORKS__");                                   \
 129       builtin_assert ("system=unix");                                   \
 130       if (TARGET_VXWORKS_RTP)                                           \
 131         builtin_define ("__RTP__");                                     \
 132       else                                                              \
 133         builtin_define ("_WRS_KERNEL");                                 \
 134     }                                                                   \
 135   while (0)
 136
 137 #define VXWORKS_KIND VXWORKS_KIND_NORMAL
 138
 139 /* The diab linker does not handle .gnu_attribute sections.  */
 140 #undef HAVE_AS_GNU_ATTRIBUTE