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From: wendt@.cs.colostate.edu (Alan W)
Newsgroups: comp.unix.xenix.sco
Subject: 2.3.2 compiler bug
Message-ID: <15055@ccncsu.ColoState.EDU>
Date: 21 May 91 05:28:11 GMT
Sender: news@ccncsu.ColoState.EDU
Organization: Colorado State Computer Science Department
Lines: 27


System:  Xenix 2.3.2 for 286.

Problem:  >>= operator rapes stack, dumps core with -M2l.

Reproduce by:  compiling the following with -M2l and observing a core dump.

main()
    {
    static long x;
    int	i;

    for (i = 0; i < 20000; i++)
        x >>= 8;

    write(1, "done!\n", 6);
    }

Fix:
   Verify that your compiler exhibits the problem.
   Extract the routine __blshr from /lib/Llibc.a.
   Use adb -w to change the "reti 6" at its end to a "reti 4".
   Verify that you have fixed the problem by recompiling the
   test with the .o file on the command line.
   Reinstall the .o file into the /lib/Llibc.a archive.

Alan Wendt