On 4/26/07, Bruce Foster <bef_at_[hidden]> wrote:
> The README instructions for PGI compilation have a typo:
> Current context:
> - The Portland Group compilers require the "-Msignextend" compiler
> flag to extend the sign bit when converting from a shorter to longer
> integer. This is is different than other compilers (such as GNU).
> When compiling Open MPI with the Portland compiler suite, the
> following flags should be passed to Open MPI's configure script:
Hi Bruce,
let's quote the man page of pgcc:
-Msignextend (default) -Mnosignextend
Sign extend (don't sign extend) when a narrowing conversion
overflows. For example, when -Msignextend is in effect and
an integer containing the value 65535 is converted to a
short, the value of the short will be -1. ANSI C specifies
that the result of such conversions are undefined.
This is PGI 7.0-2. So maybe the documentation should be changed into
'The Portland Group compilers prior to version 7.0 require ...'
Regards, Götz Waschk
--
AL I:40: Do what thou wilt shall be the whole of the Law.
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