Jeff Hammond <jhammond@alcf.anl.gov> a écrit :

This is a bug in the Cray compiler.  They cannot and should not set
the __GNUC__ flag unless they are fully compatible with GCC.  There
are many ways to define "fully compatible" but at a minimum, code that
compiles with GCC needs to compile with any compiler that elects to
define __GNUC__.  It is prudent to impose a higher standard in some
cases but that's not pertinent to this discussion.

Lots of vendor compilers pretend to be __GNUC__ for any number of
reasons.  I believe that they are all wrong for doing it.

Regarding this specific issue, there is nothing wrong with hwloc and I
don't know why anyone should bother trying to fix Cray's problem, but
I suspect that pragmatism will prevail, as it appears to have in the
case of Boost (http://www.boost.org/doc/libs/1_52_0/boost/config/select_platform_config.hpp).

I'll reproduce this locally and contact Cray directly about fixing
this on their end.

Best,

Jeff

On Thu, Jan 17, 2013 at 12:19 PM, Erik Schnetter <schnetter@gmail.com> wrote:
hwloc-1.6.1rc2 fails to build with the Cray compiler

Cray C : Version 8.1.2  Thu Jan 17, 2013  12:18:54

The error message is

CC       bitmap.lo
CC-147 craycc: ERROR
Declaration is incompatible with "int ffsl(long)" (declared at line 526 of
"/opt/cray/xe-sysroot/4.1.20/usr/include/string.h").

(Yes, there is no line number with the error message.)

This seems to be caused by the fact that the Cray compiler
sets __GNUC__,
but is not quite compatible. A work-around is to change line 56 of
include/private/misc.h from

#elif defined(__GNUC__)

to

#elif defined(__GNUC__) && !defined(_CRAYC)

-erik

--
Erik Schnetter <schnetter@gmail.com>
http://www.perimeterinstitute.ca/personal/eschnetter/


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