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

[Murray Wolinsky]

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://github.com/nds-org/jupyter-et/blob/master/CactusTutorial.ipynb
> >
> > 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 http://pgp.mit.edu .
>
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