When running test-case gdb.dwarf2/gdb-index.exp cleanly by issuing this
command:
...
$ rm -Rf build/gdb/testsuite/outputs/gdb.dwarf2/gdb-index
...
before running, it passes both with native and target board
cc-with-gdb-index.
But when we run the test-case first with native and then with
cc-with-gdb-index without intermediate cleanup, we get instead:
...
Running src/gdb/testsuite/gdb.dwarf2/gdb-index.exp ...
gdb compile failed, cc-with-tweaks.sh: Index file \
build/gdb/testsuite/outputs/gdb.dwarf2/gdb-index/gdb-index.gdb-index \
exists, won't clobber.
=== gdb Summary ===
# of untested testcases 1
...
What happens is that the native run produces a file
build/gdb/testsuite/outputs/gdb.dwarf2/gdb-index/gdb-index.gdb-index, which
causes gdb/contrib/cc-with-tweaks.sh to hit this code:
...
index_file="${output_file}.gdb-index"
if [ "$want_index" = true ] && [ -f "$index_file" ]
then
echo "$myname: Index file $index_file exists, won't clobber." >&2
exit 1
fi
...
The gdb-add-index script has a problem that it uses temp files alongside the
executable, filed as PR25843.
The code in cc-with-tweaks.sh attempts to detect the case that creating such a
temp file would overwrite an pre-existing file. It however does this only for
a single file, while gdb-add-index uses more temporary files:
- <exec>.gdb-index
- <exec>.debug_names
- <exec>.debug_str
- <exec>.debug_str.merge
- <exec>.debug_str.err
Fix this by working around PR25843 in a more generic way:
- move the executable into a temp directory
- execute gdb-add-index, allowing it to create any temp file alongside the
executable in the temp directory
- move the executable back to the original location
Tested on x86_64-linux, with target board cc-with-debug-index.
gdb/ChangeLog:
2020-04-24 Tom de Vries <tdevries@suse.de>
* contrib/cc-with-tweaks.sh: Remove <exec>.gdb-index file handling.
Run gdb-add-index inside temp dir.
f80cb3b46a