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Thread: error: argument to -O should be a non-negative integer

  1. #1
    Join Date
    Jan 2013
    Beans
    25

    error: argument to -O should be a non-negative integer

    I wanted to try the same program that I am running in the SCO 5.05 environment into the Ubuntu server 12.04. However, in order to me to run it, I have to recompile the libraries. Here is the error I am getting when I try to recompile the libraries with *.a

    $ make -f mlib.rmk
    cc -c -Oactl -DPERFORMANCE string.c
    cc1: error: argument to '-O' should be a non-negative integer
    make: *** [string.o] Error 1

    Inside mlib.rmk, I have this:

    libdb5.a: string.o entry.o allget.o
    ar -ruv libdb5.a *.o

    .c.o:
    cc -c -Oactl -DPERFORMANCE $*.c

    io.o: io.c my.h dbc.h myfprot.h

    I have only typed the first few objects *.o above, but I have more. Please help. Thanks.

    Regards,
    Sam

  2. #2
    Join Date
    Jul 2007
    Location
    Magic City of the Plains
    Beans
    Hidden!
    Distro
    Xubuntu 14.10 Utopic Unicorn

    Re: error: argument to -O should be a non-negative integer

    Moved to Packaging and Compiling Programs.

  3. #3
    Join Date
    Feb 2013
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    Re: error: argument to -O should be a non-negative integer

    Well, the error message says it all. -O option in GCC takes numeric values. You can try
    Code:
    cc -c -O2 -DPERFORMANCE $*.c
    But the best course would be to check what -Oactl does in SCO compiler, and then enable similar optimizations for GCC.

  4. #4
    Join Date
    Feb 2013
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    Hidden!

    Re: error: argument to -O should be a non-negative integer

    So, if the optimization flags for SCO UNIX 5.05 are still the same as for XENIX 286, then their meaning is

    d - Default. Disables optimization
    a - Relaxes alias checking
    s - Optimizes code for space
    t - Default. Optimizes code for speed
    x - Performs maximum optimization. Equivalent to -Oactl
    c - Eliminates common expressions
    l - Performs various loop optimizations

    I guess, in order to emulate -Oactl on GCC you can try something like
    Code:
    gcc -c -O2 -fpredictive-commoning -funswitch-loops -DPERFORMANCE $*.c

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