[users@httpd] Why is '-XO4 -xchip=generic' recommended for compilation with Sun Studio?

[Stanley Dziegiel <sd...@stronglg.demon.co.uk>]

Hello,

The last few lines in README.platforms state:

    If you use Sun Studio, the following compiler flags (CFLAGS) are
    recommended:

      -XO4 -xchip=generic

It first occurs in httpd-2.2.4.

We are seeing a fault approximately once a week with our in-house build
of Apache that uses -X05 ... We have six live hosts and the distribution
of the fault is random.

Can anybody remember why this recommendation was made? It implies that there
is a problem with -X05 but I would appreciate the details.

Thanks, Stanley

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