On 4/26/07, Bruce Foster <[email protected]> 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.
