gdb/contrib/cc-with-tweaks.sh

   1 #! /bin/sh
   2 # Wrapper around gcc to tweak the output in various ways when running
   3 # the testsuite.
   4
   5 # Copyright (C) 2010-2012 Free Software Foundation, Inc.
   6 # This program 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 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 # This program requires gdb and objcopy in addition to gcc.
  20 # The default values are gdb from the build tree and objcopy from $PATH.
  21 # They may be overridden by setting environment variables GDB and OBJCOPY
  22 # respectively.
  23 # We assume the current directory is either $obj/gdb or $obj/gdb/testsuite.
  24 #
  25 # Example usage:
  26 #
  27 # bash$ cd $objdir/gdb/testsuite
  28 # bash$ runtest \
  29 #   CC_FOR_TARGET="/bin/sh $srcdir/gdb/contrib/cc-with-tweaks.sh ARGS gcc" \
  30 #   CXX_FOR_TARGET="/bin/sh $srcdir/gdb/contrib/cc-with-tweaks.sh ARGS g++"
  31 #
  32 # For documentation on index files: info -f gdb.info -n "Index Files"
  33 # For information about 'dwz', see the announcement:
  34 #     http://gcc.gnu.org/ml/gcc/2012-04/msg00686.html
  35 # (More documentation is to come.)
  36
  37 # ARGS determine what is done.  They can be:
  38 # -z compress using dwz
  39 # -m compress using dwz -m
  40 # -i make an index
  41 # If nothing is given, no changes are made
  42
  43 myname=cc-with-tweaks.sh
  44
  45 if [ -z "$GDB" ]
  46 then
  47     if [ -f ./gdb ]
  48     then
  49         GDB="./gdb"
  50     elif [ -f ../gdb ]
  51     then
  52         GDB="../gdb"
  53     elif [ -f ../../gdb ]
  54     then
  55         GDB="../../gdb"
  56     else
  57         echo "$myname: unable to find usable gdb" >&2
  58         exit 1
  59     fi
  60 fi
  61
  62 OBJCOPY=${OBJCOPY:-objcopy}
  63
  64 DWZ=${DWZ:-dwz}
  65
  66 have_link=unknown
  67 next_is_output_file=no
  68 output_file=a.out
  69
  70 want_index=false
  71 want_dwz=false
  72 want_multi=false
  73
  74 while [ $# -gt 0 ]; do
  75     case "$1" in
  76         -z) want_dwz=true ;;
  77         -i) want_index=true ;;
  78         -m) want_multi=true ;;
  79         *) break ;;
  80     esac
  81     shift
  82 done
  83
  84 for arg in "$@"
  85 do
  86     if [ "$next_is_output_file" = "yes" ]
  87     then
  88         output_file="$arg"
  89         next_is_output_file=no
  90         continue
  91     fi
  92
  93     # Poor man's gcc argument parser.
  94     # We don't need to handle all arguments, we just need to know if we're
  95     # doing a link and what the output file is.
  96     # It's not perfect, but it seems to work well enough for the task at hand.
  97     case "$arg" in
  98     "-c") have_link=no ;;
  99     "-E") have_link=no ;;
 100     "-S") have_link=no ;;
 101     "-o") next_is_output_file=yes ;;
 102     esac
 103 done
 104
 105 if [ "$next_is_output_file" = "yes" ]
 106 then
 107     echo "$myname: Unable to find output file" >&2
 108     exit 1
 109 fi
 110
 111 if [ "$have_link" = "no" ]
 112 then
 113     "$@"
 114     exit $?
 115 fi
 116
 117 index_file="${output_file}.gdb-index"
 118 if [ "$want_index" = true ] && [ -f "$index_file" ]
 119 then
 120     echo "$myname: Index file $index_file exists, won't clobber." >&2
 121     exit 1
 122 fi
 123
 124 output_dir="${output_file%/*}"
 125 [ "$output_dir" = "$output_file" ] && output_dir="."
 126
 127 "$@"
 128 rc=$?
 129 [ $rc != 0 ] && exit $rc
 130 if [ ! -f "$output_file" ]
 131 then
 132     echo "$myname: Internal error: $output_file missing." >&2
 133     exit 1
 134 fi
 135
 136 if [ "$want_index" = true ]; then
 137     $GDB --batch-silent -nx -ex "set auto-load no" -ex "file $output_file" -ex "save gdb-index $output_dir"
 138     rc=$?
 139     [ $rc != 0 ] && exit $rc
 140
 141     # GDB might not always create an index.  Cope.
 142     if [ -f "$index_file" ]
 143     then
 144         $OBJCOPY --add-section .gdb_index="$index_file" \
 145             --set-section-flags .gdb_index=readonly \
 146             "$output_file" "$output_file"
 147         rc=$?
 148     else
 149         rc=0
 150     fi
 151     [ $rc != 0 ] && exit $rc
 152 fi
 153
 154 if [ "$want_dwz" = true ]; then
 155     $DWZ "$output_file" > /dev/null 2>&1
 156 elif [ "$want_multi" = true ]; then
 157     cp $output_file ${output_file}.alt
 158     $DWZ -m ${output_file}.dwz "$output_file" ${output_file}.alt > /dev/null 2>&1
 159 fi
 160
 161 rm -f "$index_file"
 162 exit $rc