[Bug 623] native MIPS compiler misidentified as Compaq CC

From: Dan Bonachea (bonachea_at_cs_dot_berkeley_dot_edu)
Date: Thu May 27 2004 - 14:42:11 PDT

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    bonachea_at_cs_dot_berkeley_dot_edu changed:
                What    |Removed                     |Added
                  Status|NEW                         |ASSIGNED
    ---- Additional Comments From bonachea_at_cs_dot_berkeley_dot_edu  2004-05-27 14:56 ----
    The root of the problem is that by default the MIPSPro C compiler's 
    fails to generate an exit code indicating failure when it hits an #error
    statement in the code - it foolishly treats this as a warning, which of course
    breaks most of the autoconf framework (not just for Berkeley UPC, but many
    autoconf scripts, which rely on the basic behavior of #error causing an error 
    detect things).
    MIPSPro C does *not* actually define __DECC, but the lack of a proper exit 
    on error is giving the impression that it defines all the symbols we ask for,
    and __DECC just happens to be the last one on the list so that's the one that
    turns up. (ie note the "warning" that should have been an error when we test 
         323 cc-1035 cc: WARNING File = configure, Line = 3935
         324   #error directive:
         326   # error
         327     ^
    Temporary workaround is to set CC="cc -diag_error 1035" before running
    configure. That tells MIPSPro C to behave like a real C preprocessor and treat
    #error like an error.
    I'm not sure how to fix this in general because we have a chicken and egg
    situation - we need this special flag to be applied to MIPSPro C very early in
    configure in order for anything to work, including the detection that we're
    using MIPSPro C (and that we need the flag). I'll probably just add a
    special-case detection for this C preprocessor.
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