[Llvm-bgq-discuss] question about flags

[Hal Finkel]

Hi John,

If you're compiling with -mcpu=a2 with the default Linux target then -mno-qpx -mllvm -qpx-stack-unaligned -mllvm -ppc-always-use-base-pointer should really be unnecessary. I recommend that you try with the upstream trunk (or the latest release candidate for 3.5 -- 3.5 is due out next week) and see if that works. You may just be hitting some upstream bug that has been fixed now, and while I'll be putting together a new bgclang release shortly, since you're running on the IONs, you don't need to wait for that.

 -Hal

----- Original Message -----
> From: "John A. Biddiscombe" <biddisco at cscs.ch>
> To: "Hal Finkel" <hfinkel at anl.gov>
> Cc: llvm-bgq-discuss at lists.alcf.anl.gov
> Sent: Tuesday, August 26, 2014 8:27:07 AM
> Subject: RE: [Llvm-bgq-discuss] question about flags
> 
> Hal
> 
> Linking. I see now that it produces the message when linking, so I
> will ignore it.
> 
> Unfortunately, the flags did not help me.
> I've got a problem with this test
> https://raw.githubusercontent.com/biddisco/cpptest/master/regex-recursion.cxx
> 
> which hangs after the first boost_check_throw, the first bad regex
> test does not throw and hangs indefinitely. Since it's a possibly
> stack related problem inside regex, I thought the stack related
> flags might help.
> 
> I'm using
> -mcpu=a2 --std=c++11 -stdlib=libc++ -mno-qpx -mllvm
> -qpx-stack-unaligned -mllvm -ppc-always-use-base-pointer
> 
> but no joy yet.
> 
> Can you suggest any other stack related flags that I might experiment
> with, I'll be working my way through
> clang++ --help | grep stack
> 
> to get ideas. But it does mean a lot of tedious boost recompilation.
> 
> gcc4.8.2 compiles the test and runs ok (also using -std=c++11 which I
> need for other reasons)
> So far I've tried boost_1_55 and 1_56
> 
> ta
> 
> JB
> 
> 
> -----Original Message-----
> From: Hal Finkel [mailto:hfinkel at anl.gov]
> Sent: 26 August 2014 14:17
> To: Biddiscombe, John A.
> Cc: llvm-bgq-discuss at lists.alcf.anl.gov
> Subject: Re: [Llvm-bgq-discuss] question about flags
> 
> John,
> 
> Does it say this when compiling, or just when linking? I'd expect
> them to be unused when linking.
> 
>  -Hal
> 
> ----- Original Message -----
> > From: "John A. Biddiscombe" <biddisco at cscs.ch>
> > To: llvm-bgq-discuss at lists.alcf.anl.gov
> > Sent: Tuesday, August 26, 2014 7:09:42 AM
> > Subject: [Llvm-bgq-discuss] question about flags
> > 
> > 
> > 
> > 
> > 
> > When I use
> > 
> > -mllvm -qpx-stack-unaligned
> > 
> > -mllvm -ppc-always-use-base-pointer
> > 
> > 
> > 
> > the compiler tells me that these flags are unused. I wanted to
> > experiment with them to try to work around a boost problem I’ve
> > got.
> > Are there equivalents that I should be using instead?
> > 
> > 
> > 
> > thanks
> > 
> > 
> > 
> > JB
> > 
> > 
> > 
> > 
> > 
> > --
> > 
> > John Biddiscombe, email:biddisco @.at.@ cscs.ch
> > 
> > http://www.cscs.ch/
> > 
> > CSCS, Swiss National Supercomputing Centre | Tel: +41 (91)
> > 610.82.07
> > 
> > Via Trevano 131, 6900 Lugano, Switzerland | Fax: +41 (91) 610.82.82
> > 
> > 
> > _______________________________________________
> > llvm-bgq-discuss mailing list
> > llvm-bgq-discuss at lists.alcf.anl.gov
> > https://lists.alcf.anl.gov/mailman/listinfo/llvm-bgq-discuss
> > 
> 
> --
> Hal Finkel
> Assistant Computational Scientist
> Leadership Computing Facility
> Argonne National Laboratory
> 

-- 
Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory