annotate gcc/mkconfig.sh @ 16:04ced10e8804

gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents f6334be47118
children 84e7813d76e9
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1 #! /bin/sh
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2
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3 # Copyright (C) 2001-2017 Free Software Foundation, Inc.
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4 # This file is part of GCC.
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5
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6 # GCC is free software; you can redistribute it and/or modify
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7 # it under the terms of the GNU General Public License as published by
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8 # the Free Software Foundation; either version 3, or (at your option)
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9 # any later version.
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10
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11 # GCC is distributed in the hope that it will be useful,
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 # GNU General Public License for more details.
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15
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16 # You should have received a copy of the GNU General Public License
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17 # along with GCC; see the file COPYING3. If not see
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18 # <http://www.gnu.org/licenses/>.
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19
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20
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21 # Generate gcc's various configuration headers:
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22 # config.h, tconfig.h, bconfig.h, tm.h, libgcc_tm.h, and tm_p.h.
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23 # $1 is the file to generate. DEFINES, HEADERS, and possibly
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24 # TARGET_CPU_DEFAULT are expected to be set in the environment.
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25
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26 if [ -z "$1" ]; then
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27 echo "Usage: DEFINES='list' HEADERS='list' \\" >&2
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28 echo " [TARGET_CPU_DEFAULT='default'] mkconfig.sh FILE" >&2
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29 exit 1
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30 fi
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31
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32 output=$1
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33 rm -f ${output}T
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34
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35 # This converts a file name into header guard macro format.
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36 hg_sed_expr='y,abcdefghijklmnopqrstuvwxyz./,ABCDEFGHIJKLMNOPQRSTUVWXYZ__,'
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37 header_guard=GCC_`echo ${output} | sed -e ${hg_sed_expr}`
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39 # Add multiple inclusion protection guard, part one.
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40 echo "#ifndef ${header_guard}" >> ${output}T
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41 echo "#define ${header_guard}" >> ${output}T
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42
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43 # A special test to ensure that build-time files don't blindly use
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44 # config.h.
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45 if test x"$output" = x"config.h"; then
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46 echo "#ifdef GENERATOR_FILE" >> ${output}T
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47 echo "#error config.h is for the host, not build, machine." >> ${output}T
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48 echo "#endif" >> ${output}T
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49 fi
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50
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51 # Define TARGET_CPU_DEFAULT if the system wants one.
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52 # This substitutes for lots of *.h files.
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53 if [ "$TARGET_CPU_DEFAULT" != "" ]; then
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54 echo "#define TARGET_CPU_DEFAULT ($TARGET_CPU_DEFAULT)" >> ${output}T
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55 fi
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56
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57 # Provide defines for other macros set in config.gcc for this file.
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58 for def in $DEFINES; do
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59 echo "#ifndef $def" | sed 's/=.*//' >> ${output}T
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60 echo "# define $def" | sed 's/=/ /' >> ${output}T
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61 echo "#endif" >> ${output}T
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62 done
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63
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64 # The first entry in HEADERS may be auto-FOO.h ;
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65 # it wants to be included even when not -DIN_GCC.
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66 # Postpone including defaults.h until after the insn-*
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67 # headers, so that the HAVE_* flags are available
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68 # when defaults.h gets included.
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69 postpone_defaults_h="no"
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70 if [ -n "$HEADERS" ]; then
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71 set $HEADERS
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72 case "$1" in auto-* )
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73 echo "#include \"$1\"" >> ${output}T
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74 shift
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75 ;;
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76 esac
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77 if [ $# -ge 1 ]; then
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78 echo '#ifdef IN_GCC' >> ${output}T
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79 for file in "$@"; do
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80 if test x"$file" = x"defaults.h"; then
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81 postpone_defaults_h="yes"
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82 else
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83 echo "# include \"$file\"" >> ${output}T
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84 fi
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85 done
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86 echo '#endif' >> ${output}T
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87 fi
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88 fi
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89
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90 # If this is tm.h, now include insn-flags.h only if IN_GCC is defined
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91 # but neither GENERATOR_FILE nor USED_FOR_TARGET is defined. (Much of this
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92 # is temporary.)
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93
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94 case $output in
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95 tm.h )
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96 cat >> ${output}T <<EOF
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97 #if defined IN_GCC && !defined GENERATOR_FILE && !defined USED_FOR_TARGET
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98 # include "insn-flags.h"
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99 #endif
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100 #if defined IN_GCC && !defined GENERATOR_FILE
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101 # include "insn-modes.h"
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102 #endif
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103 EOF
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104 ;;
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105 esac
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106
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107 # If we postponed including defaults.h, add the #include now.
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108 if test x"$postpone_defaults_h" = x"yes"; then
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109 echo "# include \"defaults.h\"" >> ${output}T
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110 fi
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111
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112 # Add multiple inclusion protection guard, part two.
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113 echo "#endif /* ${header_guard} */" >> ${output}T
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114
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115 # Avoid changing the actual file if possible.
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116 if [ -f $output ] && cmp ${output}T $output >/dev/null 2>&1; then
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117 echo $output is unchanged >&2
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118 rm -f ${output}T
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119 else
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120 mv -f ${output}T $output
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121 fi
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122
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123 # Touch a stamp file for Make's benefit.
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124 rm -f cs-$output
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125 echo timestamp > cs-$output