2 # Wrapper around gcc to tweak the output in various ways when running
5 # Copyright (C) 2010-2016 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.
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.
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/>.
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. Note that GDB should contain the gdb binary as well as the
23 # -data-directory flag, e.g., "foo/gdb -data-directory foo/data-directory".
24 # We assume the current directory is either $obj/gdb or $obj/gdb/testsuite.
28 # bash$ cd $objdir/gdb/testsuite
30 # CC_FOR_TARGET="/bin/sh $srcdir/gdb/contrib/cc-with-tweaks.sh ARGS gcc" \
31 # CXX_FOR_TARGET="/bin/sh $srcdir/gdb/contrib/cc-with-tweaks.sh ARGS g++"
33 # For documentation on Fission and dwp files:
34 # http://gcc.gnu.org/wiki/DebugFission
35 # http://gcc.gnu.org/wiki/DebugFissionDWP
36 # For documentation on index files: info -f gdb.info -n "Index Files"
37 # For information about 'dwz', see the announcement:
38 # http://gcc.gnu.org/ml/gcc/2012-04/msg00686.html
39 # (More documentation is to come.)
41 # ARGS determine what is done. They can be:
42 # -Z invoke objcopy --compress-debug-sections
43 # -z compress using dwz
44 # -m compress using dwz -m
46 # -p create .dwp files (Fission), you need to also use gcc option -gsplit-dwarf
47 # If nothing is given, no changes are made
49 myname
=cc-with-tweaks.sh
55 GDB
="./gdb -data-directory data-directory"
58 GDB
="../gdb -data-directory ../data-directory"
61 GDB
="../../gdb -data-directory ../../data-directory"
63 echo "$myname: unable to find usable gdb" >&2
68 OBJCOPY
=${OBJCOPY:-objcopy}
69 READELF
=${READELF:-readelf}
75 next_is_output_file
=no
82 want_objcopy_compress
=false
84 while [ $# -gt 0 ]; do
86 -Z) want_objcopy_compress
=true
;;
88 -i) want_index
=true
;;
89 -m) want_multi
=true
;;
98 if [ "$next_is_output_file" = "yes" ]
101 next_is_output_file
=no
105 # Poor man's gcc argument parser.
106 # We don't need to handle all arguments, we just need to know if we're
107 # doing a link and what the output file is.
108 # It's not perfect, but it seems to work well enough for the task at hand.
110 "-c") have_link
=no
;;
111 "-E") have_link
=no
;;
112 "-S") have_link
=no
;;
113 "-o") next_is_output_file
=yes ;;
117 if [ "$next_is_output_file" = "yes" ]
119 echo "$myname: Unable to find output file" >&2
123 if [ "$have_link" = "no" ]
129 index_file
="${output_file}.gdb-index"
130 if [ "$want_index" = true
] && [ -f "$index_file" ]
132 echo "$myname: Index file $index_file exists, won't clobber." >&2
136 output_dir
="${output_file%/*}"
137 [ "$output_dir" = "$output_file" ] && output_dir
="."
141 [ $rc != 0 ] && exit $rc
142 if [ ! -f "$output_file" ]
144 echo "$myname: Internal error: $output_file missing." >&2
148 if [ "$want_objcopy_compress" = true
]; then
149 $OBJCOPY --compress-debug-sections "$output_file"
151 [ $rc != 0 ] && exit $rc
154 if [ "$want_index" = true
]; then
155 $GDB --batch-silent -nx -ex "set auto-load no" -ex "file $output_file" -ex "save gdb-index $output_dir"
157 [ $rc != 0 ] && exit $rc
159 # GDB might not always create an index. Cope.
160 if [ -f "$index_file" ]
162 $OBJCOPY --add-section .gdb_index
="$index_file" \
163 --set-section-flags .gdb_index
=readonly \
164 "$output_file" "$output_file"
169 [ $rc != 0 ] && exit $rc
172 if [ "$want_dwz" = true
]; then
173 $DWZ "$output_file" > /dev
/null
2>&1
174 elif [ "$want_multi" = true
]; then
175 cp $output_file ${output_file}.alt
176 $DWZ -m ${output_file}.dwz
"$output_file" ${output_file}.alt
> /dev
/null
2>&1
179 if [ "$want_dwp" = true
]; then
180 dwo_files
=$
($READELF -wi "${output_file}" |
grep _dwo_name | \
181 sed -e 's/^.*: //' |
sort |
uniq)
183 if [ -n "$dwo_files" ]; then
184 $DWP -o "${output_file}.dwp" ${dwo_files} > /dev
/null
186 [ $rc != 0 ] && exit $rc
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