[Llvm-bgq-discuss] question about flags

[Biddiscombe, John A.]

Hal

I spent the rest of the day compiling clang and I’m quite surprised to say
that after considerable trial and error, I now have my regex test passing
with a freshly minted clang 3.6!

I had to cheat and use your libc++ from the latest bgclang release because
I didn’t realise that the libc++ was not compiled with clang itself, but
I’ve set a compilation going with the libc++ (and libc++ABI or whatever it
is). Once they’re done, then in principle I won’t need the bgclang stuff
and I’ll stop annoying you with these emails. I expect you’ll be sad about
that!

[Fear not though as I will still need to get stuff running on the compute
nodes, but at least in principle I can now compile the bgclang toolset
myself so I might even be able to help test your stuff before you release
it].

Thanks once more for all the help

JB




On 26/08/14 16:55, "Hal Finkel" <hfinkel at anl.gov> wrote:

>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