DynamoRIO / DynamoRIO/dynamorio
duplicate tool names listed for -t help message in re-used install dir due to appending to file
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Description
I have an install dir into which I've done "make install" many times. The
tools/list\* files seem to accumulate duplicate names:
```
% /work/dr/git/exports/bin64/drrun
ERROR: no app specified
USAGE: drrun [options]
or: drrun [options] --
or: drrun [options] [DR options] --
or: drrun [options] [DR options] -c [client options] --
or: drrun [options] [DR options] -t [tool options] --
available tools include: drcpusim, drcachesim, drltrace, drcov, drcpusim, drcachesim, drltrace, drcov, drcpusim, drcachesim, drltrace, drcov, drcpusim, drcachesim, drltrace, drcov, drcpusim, drcachesim, drltrace, drcov, drcpusim, drcachesim, drltrace, drcov, drcpusim, drcachesim, d
Run with -help to see drrun option list
% head /work/dr/git/exports/tools/list64
drcpusim
drcachesim
drltrace
drcov
drcpusim
drcachesim
drltrace
drcov
drcpusim
drcachesim
% wc /work/dr/git/exports/tools/list64
76 76 665 /work/dr/git/exports/tools/list64
```
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