[Users] Need help building Einstein Toolkit: clang: error: unsupported option '-fopenmp'

Tue Apr 13 12:50:02 CDT 2021

Hello Murray,

ok. Good to hear that.

My initial email was a send a bit off the cuff since I had not quite
realized that you were already using the notebook.

OSX is a bit tricky for the ET to support for the reasons that you
outlined.

When you run "./simfactory/bin/sim setup-silent" simulation factory will
find the gcc-10 compiler and creates a set of of make options for your
laptop (there's explicit code in simfactory to recongnize OSX). So
running this command is essential.

You should not have to adjust anything (though given that the last test
with Catalina rather than BigSur was about a year ago that may not be
true anymore if HomeBrew changed too much).

This set of options is tied to your laptop's hostname as reported by
"hostname -f". Unfortunately this hostname is not "stable" in the
sense that it may change with time since it can be derived from your
laptop's IP address obtained from the wireless network. Eg on my test
laptop it currently reads:

wirelessprvnat-172-16-210-128.near.illinois.edu

So you may have to check that 

"./simfactory/bin/sim whoami"

returns the expected machine name and run "./simfactory/bin/sim
setup-silent" again if it reports an unknown machine.

You can also create a file $HOME/.hostname and add a name that you
would like simfactory to use for your laptop eg:

echo >$HOME/.hostname "murrays-laptop"

(no spaces allowed).

Yours,
Roland

> Hi Roland,
> 
> Thanks so much for your response! I've been struggling with the -fopenmp
> issue for a couple of days now. I'll try your suggestions and let you know
> if it works. It's encouraging to know that the ET works with Catalina: that
> gives me hope I'll get it to work eventually.
> 
> I'm using the notebook CactusTutorial.ipynb, and I certainly don't want to
> use clang. But the Mac makes using gcc instead of clang tricky. On my
> machine, gcc gets clang; you need to enter gcc-10 to get gcc.
> 
> I verified that gcc (gcc-10) accepts the -fopenmp flag properly. So both
> gcc and OpenMP seem to work properly on my machine. My problem is
> convincing ET to use gcc instead of clang! BTW, I'm using brew. It's
> possible that MacPorts would work better, but I think brew and MacPorts are
> incompatible.
> 
> Again, thank you and I'll let you know my progress later today.
> 
> Yours,
> 
> Murray
> 
> On Tue, Apr 13, 2021 at 9:55 AM Roland Haas <rhaas at illinois.edu> wrote:
> 
> > Hello Murray,
> >
> > thinking about this a bit more.
> >
> > The notebook currently (as of last week) lets me compile and run the ET
> > using Homebrew (and worked on Catalina in the past).
> >
> > One thing to keep in mind is that the various CC/CXX and other
> > exported env variables are only used the *first* time you attempt to
> > build and not afterwards.
> >
> > You may have more luck having the options be respected by using:
> >
> > ./simfactory/bin/sim build --clean --reconfig
> >
> > which will recompile from scratch and re-run the configuration stage or
> > even by manually removing the "configs/sim" directory completely.
> >
> > Did you run "simfactory/bin/sim setup-silent" before trying to compile?
> >
> > Yours,
> > Roland
> >  
> > > Hello Murray,
> > >
> > > clang (in particular Apple's version delivered in OSX) is not fully
> > > supported by the ET (due to, at least historically, no OpenMP support,
> > > no paired Fortran compiler).
> > >
> > > Please see the initial section of:
> > >
> > > https://urldefense.com/v3/__https://github.com/nds-org/jupyter-et/blob/master/CactusTutorial.ipynb__;!!DZ3fjg!vBkInm5NFkd2yeuitJ1Bdg6aPGIDCDXMQZsV-k7fG50QV1uy1SqxbWDXQTfC3_p7$ 
> > >
> > > for how to use the ET on OSX using homebrew or macports.
> > >
> > > If you have a Fortran compiler installed you can try disabling openmp
> > > by setting OPENMP=no in your option list. I strongly advise consulting
> > > the link I provided above and following the (tested and
> > > verified) instructions there in particular if this is your first time
> > > using the toolkit.
> > >
> > > Yours,
> > > Roland
> > >  
> > > > Hi All,
> > > >
> > > > Thanks so much for making the Einstein Toolkit software available!
> > > >
> > > > I'm using the CactusTutorial.ipynb that I got from your site. I'm  
> > trying to  
> > > > build ET on my 2015 Macbook Pro running OS 10.15.7.
> > > >
> > > > I'm stuck at the cell (after) *Building the Einstein Toolkit* .
> > > > I modified that cell to get past issues with zlib . The cell now looks  
> > like:  
> > > >
> > > > %%bash
> > > > export ZLIB_DIR=/usr/local/opt/zlib/lib
> > > > export LDFLAGS="-L/usr/local/opt/zlib/lib"
> > > > export CPPFLAGS="-I/usr/local/opt/zlib/include"
> > > > export PKG_CONFIG_PATH="/usr/local/opt/zlib/lib/pkgconfig"
> > > > ./simfactory/bin/sim build -j2 --thornlist ../einsteintoolkit.th
> > > >
> > > > Running that cell eventually stops with the errors
> > > >
> > > > COMPILING CactusBase/CoordBase/src/Domain.c
> > > > COMPILING configs/sim/bindings/build/ADMCoupling/cctk_ThornBindings.c
> > > > clang: error: unsupported option '-fopenmp'
> > > > make[3]: *** [Domain.c.o] Error 1
> > > > make[2]: *** [make.checked] Error 2
> > > > make[1]: ***  
> > [/Users/murray/Cactus/configs/sim/lib/libthorn_CoordBase.a] Error 2  
> > > > make[1]: *** Waiting for unfinished jobs....
> > > > clang: error: unsupported option '-fopenmp'
> > > > make[3]: *** [cctk_ThornBindings.c.o] Error 1
> > > > make[2]: *** [cctk_Bindings/make.checked] Error 2
> > > > make[1]: ***  
> > [/Users/murray/Cactus/configs/sim/lib/libthorn_ADMCoupling.a]  
> > > > Error 2
> > > > make: *** [sim] Error 2
> > > >
> > > >
> > > > Can you help? I'm confused by the error message coming from clang,  
> > since  
> > > > the ET seems to use gcc, but my attempt to force gcc, by including the
> > > > exports below, made no difference:
> > > >
> > > > export CC=gcc-10
> > > > export CXX=gcc-10
> > > >
> > > > I really appreciate any help you are able to provide!
> > > >
> > > > Thank you.
> > > >
> > > > Murray (Wolinsky)
> > > > ______________________________________________________
> > > >
> > > > Additional (likely irrelevant) notes:
> > > >
> > > > I used brew to install the prerequisites. It seemed to have gone
> > > > more-or-less ok.
> > > >
> > > > Brew did issue a somewhat concerning message regarding hdf5:
> > > >  
> > > > ==> Pouring hdf5-1.12.0_1.catalina.bottle.1.tar.gz  
> > > >
> > > > Warning: hdf5 dependency gcc was built with a different C++ standard
> > > >
> > > > library (libstdc++ from clang). This may cause problems at runtime.
> > > >
> > > >
> > > > But it didn't provide any guidance into fixing the potential problem.  
> > Itried  
> > > >
> > > >
> > > > brew reinstall hdf5
> > > >
> > > >
> > > > and brew no longer complains.
> > > >
> > > >
> > > > I also had some issues with the subversion installation. But I don't  
> > think  
> > > > they're responsible for my current problem.
> > > >
> > > >
> > > > Also, when I did the step *Configuring SimFactory for your machine*, I  
> > got  
> > > > the output:
> > > >
> > > > Here we will define some necessary Simulation Factory defaults.
> > > >
> > > > Determining local machine name: mw-3.local
> > > >
> > > > --------------------SUMMARY--------------------:
> > > >
> > > >
> > > > [default]
> > > > user            = murray
> > > > email           = murray
> > > > allocation      = NO_ALLOCATION
> > > >
> > > > ------------------END SUMMARY------------------:
> > > >
> > > > Contents successfully written to
> > > > /Users/murray/Cactus/repos/simfactory2/etc/defs.local.ini
> > > >
> > > >
> > > > which looks OK, but the NO_ALLOCATION message seems like it might be  
> > of concern?  
> > >
> > >  
> >
> >
> > --
> > My email is as private as my paper mail. I therefore support encrypting
> > and signing email messages. Get my PGP key from https://urldefense.com/v3/__http://pgp.mit.edu__;!!DZ3fjg!vBkInm5NFkd2yeuitJ1Bdg6aPGIDCDXMQZsV-k7fG50QV1uy1SqxbWDXQUQagYP8$  .
> >  

-- 
My email is as private as my paper mail. I therefore support encrypting
and signing email messages. Get my PGP key from http://pgp.mit.edu .
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