Safeguard against recursive client calls #40
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Add detection for a recursive calls, e.g.:
$ homcc homcc [HOMCC-ERROR] Compiler error: /usr/bin/homcc seems to have invoked itself recursively!I want to include the recursion check as early as possible so I added a preliminary
e2etest.distccprovides more sophisticated masquerading but, for now, this check should prevent errors early.