gcc/config/vxworks.h

   1 /* Common VxWorks target definitions for GNU compiler.
   2    Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007
   3    Free Software Foundation, Inc.
   4    Contributed by Wind River Systems.
   5    Rewritten by CodeSourcery, LLC.
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify it under
  10 the terms of the GNU General Public License as published by the Free
  11 Software Foundation; either version 3, or (at your option) any later
  12 version.
  13
  14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17 for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GCC; see the file COPYING3.  If not see
  21 <http://www.gnu.org/licenses/>.  */
  22
  23 /* Assert that we are targetting VxWorks.  */
  24 #undef TARGET_VXWORKS
  25 #define TARGET_VXWORKS 1
  26
  27 /* In kernel mode, VxWorks provides all the libraries itself, as well as
  28    the functionality of startup files, etc.  In RTP mode, it behaves more
  29    like a traditional Unix, with more external files.  Most of our specs
  30    must be aware of the difference.  */
  31
  32 /* We look for the VxWorks header files using the environment
  33    variables that are set in VxWorks to indicate the location of the
  34    system header files.  We use -idirafter so that the GCC's own
  35    header-file directories (containing <stddef.h>, etc.) come before
  36    the VxWorks system header directories.  */
  37
  38 /* Since we provide a default -isystem, expand -isystem on the command
  39    line early.  */
  40 #undef VXWORKS_ADDITIONAL_CPP_SPEC
  41 #define VXWORKS_ADDITIONAL_CPP_SPEC             \
  42  "%{!nostdinc:                                  \
  43     %{isystem*} -idirafter                      \
  44     %{mrtp: %:getenv(WIND_USR /h)               \
  45       ;:    %:getenv(WIND_BASE /target/h)}}"
  46
  47 /* The references to __init and __fini will be satisfied by
  48    libc_internal.a.  */
  49 #undef VXWORKS_LIB_SPEC
  50 #define VXWORKS_LIB_SPEC                                                \
  51 "%{mrtp:%{shared:-u " USER_LABEL_PREFIX "__init -u " USER_LABEL_PREFIX "__fini} \
  52         %{!shared:%{non-static:-u " USER_LABEL_PREFIX "_STI__6__rtld -ldl} \
  53                   --start-group -lc -lgcc -lc_internal -lnet -ldsi      \
  54                   --end-group}}"
  55
  56 /* The no-op spec for "-shared" below is present because otherwise GCC
  57    will treat it as an unrecognized option.  */
  58 #undef VXWORKS_LINK_SPEC
  59 #define VXWORKS_LINK_SPEC                               \
  60 "%{!mrtp:-r}                                            \
  61  %{!shared:                                             \
  62    %{mrtp:-q %{h*}                                      \
  63           %{R*} %{!Wl,-T*: %{!T*: %(link_start) }}      \
  64           %(link_target) %(link_os)}}                   \
  65  %{v:-v}                                                \
  66  %{shared:-shared}                                      \
  67  %{Bstatic:-Bstatic}                                    \
  68  %{Bdynamic:-Bdynamic}                                  \
  69  %{!Xbind-lazy:-z now}                                  \
  70  %{Xbind-now:%{Xbind-lazy:                              \
  71    %e-Xbind-now and -Xbind-lazy are incompatible}}      \
  72  %{mrtp:%{!shared:%{!non-static:-static}                \
  73                   %{non-static:--force-dynamic --export-dynamic}}}"
  74
  75 /* For VxWorks, the system provides libc_internal.a.  This is a superset
  76    of libgcc.a; we want to use it.  Make sure not to dynamically export
  77    any of its symbols, though.  Always look for libgcc.a first so that
  78    we get the latest versions of the GNU intrinsics during our builds.  */
  79 #undef VXWORKS_LIBGCC_SPEC
  80 #define VXWORKS_LIBGCC_SPEC \
  81   "-lgcc %{mrtp:--exclude-libs=libc_internal,libgcc -lc_internal}"
  82
  83 #undef VXWORKS_STARTFILE_SPEC
  84 #define VXWORKS_STARTFILE_SPEC "%{mrtp:%{!shared:-l:crt0.o}}"
  85 #define VXWORKS_ENDFILE_SPEC ""
  86
  87 /* Do VxWorks-specific parts of OVERRIDE_OPTIONS.  */
  88 #undef VXWORKS_OVERRIDE_OPTIONS
  89 #define VXWORKS_OVERRIDE_OPTIONS vxworks_override_options ()
  90 extern void vxworks_override_options (void);
  91
  92 /* Only RTPs support prioritized constructors and destructors:
  93    the implementation relies on numbered .ctors* sections.  */
  94 #define SUPPORTS_INIT_PRIORITY TARGET_VXWORKS_RTP
  95
  96 /* VxWorks requires special handling of constructors and destructors.
  97    All VxWorks configurations must use these functions.  */
  98 #undef TARGET_ASM_CONSTRUCTOR
  99 #define TARGET_ASM_CONSTRUCTOR vxworks_asm_out_constructor
 100 #undef TARGET_ASM_DESTRUCTOR
 101 #define TARGET_ASM_DESTRUCTOR vxworks_asm_out_destructor
 102 extern void vxworks_asm_out_constructor (rtx symbol, int priority);
 103 extern void vxworks_asm_out_destructor (rtx symbol, int priority);
 104
 105 /* Override the vxworks-dummy.h definitions.  TARGET_VXWORKS_RTP
 106    is defined by vxworks.opt.  */
 107 #undef VXWORKS_GOTT_BASE
 108 #define VXWORKS_GOTT_BASE "__GOTT_BASE__"
 109 #undef VXWORKS_GOTT_INDEX
 110 #define VXWORKS_GOTT_INDEX "__GOTT_INDEX__"
 111
 112 /* As for svr4.h (which not all VxWorks targets include). */
 113 #undef PTRDIFF_TYPE
 114 #define PTRDIFF_TYPE "int"
 115
 116 #undef SIZE_TYPE
 117 #define SIZE_TYPE "unsigned int"
 118
 119 /* Both kernels and RTPs have the facilities required by this macro.  */
 120 #define TARGET_POSIX_IO
 121
 122 /* A VxWorks implementation of TARGET_OS_CPP_BUILTINS.  */
 123 #define VXWORKS_OS_CPP_BUILTINS()                                       \
 124   do                                                                    \
 125     {                                                                   \
 126       builtin_define ("__vxworks");                                     \
 127       builtin_define ("__VXWORKS__");                                   \
 128       builtin_assert ("system=unix");                                   \
 129       if (TARGET_VXWORKS_RTP)                                           \
 130         builtin_define ("__RTP__");                                     \
 131       else                                                              \
 132         builtin_define ("_WRS_KERNEL");                                 \
 133     }                                                                   \
 134   while (0)
 135
 136 #define VXWORKS_KIND VXWORKS_KIND_NORMAL
 137
 138 /* The diab linker does not handle .gnu_attribute sections.  */
 139 #undef HAVE_AS_GNU_ATTRIBUTE