gcc/mkconfig.sh

   1 #! /bin/sh
   2
   3 # Copyright (C) 2001-2021 Free Software Foundation, Inc.
   4 # This file is part of GCC.
   5
   6 # GCC is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 3, or (at your option)
   9 # any later version.
  10
  11 # GCC is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15
  16 # You should have received a copy of the GNU General Public License
  17 # along with GCC; see the file COPYING3.  If not see
  18 # <http://www.gnu.org/licenses/>.
  19
  20
  21 # Generate gcc's various configuration headers:
  22 # config.h, tconfig.h, bconfig.h, tm.h, libgcc_tm.h, and tm_p.h.
  23 # $1 is the file to generate.  DEFINES, HEADERS, and possibly
  24 # TARGET_CPU_DEFAULT are expected to be set in the environment.
  25
  26 if [ -z "$1" ]; then
  27     echo "Usage: DEFINES='list' HEADERS='list' \\" >&2
  28     echo "  [TARGET_CPU_DEFAULT='default'] mkconfig.sh FILE" >&2
  29     exit 1
  30 fi
  31
  32 output=$1
  33 rm -f ${output}T
  34
  35 # This converts a file name into header guard macro format.
  36 hg_sed_expr='y,abcdefghijklmnopqrstuvwxyz./,ABCDEFGHIJKLMNOPQRSTUVWXYZ__,'
  37 header_guard=GCC_`echo ${output} | sed -e ${hg_sed_expr}`
  38
  39 # Add multiple inclusion protection guard, part one.
  40 echo "#ifndef ${header_guard}" >> ${output}T
  41 echo "#define ${header_guard}" >> ${output}T
  42
  43 # A special test to ensure that build-time files don't blindly use
  44 # config.h.
  45 if test x"$output" = x"config.h"; then
  46   echo "#ifdef GENERATOR_FILE" >> ${output}T
  47   echo "#error config.h is for the host, not build, machine." >> ${output}T
  48   echo "#endif" >> ${output}T
  49 fi
  50
  51 # Define TARGET_CPU_DEFAULT if the system wants one.
  52 # This substitutes for lots of *.h files.
  53 if [ "$TARGET_CPU_DEFAULT" != "" ]; then
  54     echo "#define TARGET_CPU_DEFAULT ($TARGET_CPU_DEFAULT)" >> ${output}T
  55 fi
  56
  57 # Provide defines for other macros set in config.gcc for this file.
  58 for def in $DEFINES; do
  59     echo "#ifndef $def" | sed 's/=.*//' >> ${output}T
  60     echo "# define $def" | sed 's/=/ /' >> ${output}T
  61     echo "#endif" >> ${output}T
  62 done
  63
  64 # The first entry in HEADERS may be auto-FOO.h ;
  65 # it wants to be included even when not -DIN_GCC.
  66 # Postpone including defaults.h until after the insn-*
  67 # headers, so that the HAVE_* flags are available
  68 # when defaults.h gets included.
  69 postpone_defaults_h="no"
  70 if [ -n "$HEADERS" ]; then
  71     set $HEADERS
  72     case "$1" in auto-* )
  73         echo "#include \"$1\"" >> ${output}T
  74         shift
  75         ;;
  76     esac
  77     if [ $# -ge 1 ]; then
  78         echo '#ifdef IN_GCC' >> ${output}T
  79         for file in "$@"; do
  80             if test x"$file" = x"defaults.h"; then
  81                 postpone_defaults_h="yes"
  82             else
  83                 echo "# include \"$file\"" >> ${output}T
  84             fi
  85         done
  86         echo '#endif' >> ${output}T
  87     fi
  88 fi
  89
  90 # If this is tm.h, now include insn-flags.h only if IN_GCC is defined
  91 # but neither GENERATOR_FILE nor USED_FOR_TARGET is defined.  (Much of this
  92 # is temporary.)
  93
  94 case $output in
  95     tm.h )
  96         cat >> ${output}T <<EOF
  97 #if defined IN_GCC && !defined GENERATOR_FILE && !defined USED_FOR_TARGET
  98 # include "insn-flags.h"
  99 #endif
 100 #if defined IN_GCC && !defined GENERATOR_FILE
 101 # include "insn-modes.h"
 102 #endif
 103 EOF
 104     ;;
 105 esac
 106
 107 # If we postponed including defaults.h, add the #include now.
 108 if test x"$postpone_defaults_h" = x"yes"; then
 109     echo "# include \"defaults.h\"" >> ${output}T
 110 fi
 111
 112 # Add multiple inclusion protection guard, part two.
 113 echo "#endif /* ${header_guard} */" >> ${output}T
 114
 115 # Avoid changing the actual file if possible.
 116 if [ -f $output ] && cmp ${output}T $output >/dev/null 2>&1; then
 117     echo $output is unchanged >&2
 118     rm -f ${output}T
 119 else
 120     mv -f ${output}T $output
 121 fi
 122
 123 # Touch a stamp file for Make's benefit.
 124 rm -f cs-$output
 125 echo timestamp > cs-$output