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Subject: Re: [hwloc-devel] hwloc-1.3.1 assertion failures on Linux/POWER7
From: Paul H. Hargrove (PHHargrove_at_[hidden])
Date: 2012-02-01 19:43:08


On 2/1/2012 4:14 PM, Christopher Samuel wrote:
> On 02/02/12 10:38, Paul H. Hargrove wrote:
>
>> > I am not sure if one should fix this by:
>> > a) Document the need for CFLAGS=-qhalt=e
>> > b) Force "-qhalt=e" at configure time when CC=xlc
>> > c) Find some other way to fix the configure probe
>> >
>> > My vote is for "(b)"
> Mine too, either that or:
>
> d) Exit saying the user has to set it, or use a different compiler.

I think I'd like to change my vote to (d) IFF we can determine the flag
is needed but not set.
Something like (untested):

AC_COMPILE_IFELSE([
     extern int one_arg(int x);
     extern int two_arg(int x, int y);
     int foo(void) { return one_arg(1, 2) + two_arg(3); }
], [
     AC_MSG_WARN([Your C compiler does not consider incorrect argument
counts to be a fatal error.])
     if test "$hwloc_check_compiler_vendor_result" = "ibm"; then
         AC_MSG_WARN([For XLC you may try appending '-qhalt=-e' to the
value of CFLAGS.])
         AC_MSG_WARN([Alternatively you may configure with a different
compiler.])
     else
         AC_MSG_WARN([Please report this failure, and configure using a
different C compiler if possible.])
     fi
     AC_MSG_ERROR([Cannot continue.])
])

-Paul

-- 
Paul H. Hargrove                          PHHargrove_at_[hidden]
Future Technologies Group
HPC Research Department                   Tel: +1-510-495-2352
Lawrence Berkeley National Laboratory     Fax: +1-510-486-6900