Thursday, November 11, 2021

[SOLVED] Compiling and running Xrotor on Ubuntu 20.04

Issue

I am a complete stranger to Fortran 77 and relatively new to Ubuntu. I need to get Xrotor running on a Ubuntu 20.04 machine. I referred to the hints reported here, installed gfortran and libx11-dev packages, then I edited ./plotlib/config.make as shown in the answer I linked and did so also for ./bin/Makefile.gfortran . I also added -fallow-argument-mismatch -std=legacy flags to workaround errors related to rank mismatch at several points in the code (as far as I was able to understand - please forgive me for my poor techincal skills, knowledge and jargon). When I run make -f Makefile.gfortran everything seemed to be just fine, but as I try to run Xrotor I get this same output

~/Xrotor/bin$ ./xrotor

 =========================
    XROTOR Version 7.55
 =========================
Note: The following floating-point exceptions are signalling: IEEE_DENORMAL
STOP COLORSPECTRUM: Non-monotonic color axis. Check COLWIDTH.

I understood that this could be due to an exception which is thrown when numerical errors occour. I also added

COLWIDTH=(/1.0,1.20000005,0.5,1.4,1.0,1.20000005,1.5/)

in /plotlib/plt_color.f after line 508 (although I'm not really sure that was the right spot to put it) as explained there, and did make -f Makefile.gfortran again. I believe this is supposed to prevent the COLORSPECTRUMTRP subroutine to STOP the exectution, but it doesn't work. Finally, I also tried to cancel these lines

        if(COLAXIS(ibase) .LE. COLAXIS(ibase-1))
     &   STOP 'COLORSPECTRUM: Non-monotonic color axis. Check COLWIDTH.'

from plt_color.f, yet to no avail.

Any suggestions? What am I missing? Please let me know if I need to provide further information or to attach the files I edited.


Solution

Ubuntu 20.04, Xrotor: Either convert the Fedora 33 package xrotor-7.55-18.fc33.x86_64.rpm https://dl.fedoraproject.org/pub/fedora/linux/releases/33/Everything/x86_64/os/Packages/x/xrotor-7.55-18.fc33.x86_64.rpm with alien.

Or build Xrotor with the Xrotor7.55-makefile.patch from https://dl.fedoraproject.org/pub/fedora/linux/releases/33/Everything/source/tree/Packages/x/xrotor-7.55-18.fc33.src.rpm .... Link to patch https://drive.google.com/file/d/1dF_Q-KjMTLCn_DRvEk_M2_lBobkL1TqL/view?usp=sharing

Link to unPack_rpm.sh https://drive.google.com/file/d/1q3d9QqrRhEThYByPDgWEaoxHnqWFWqfE/view?usp=sharing

tar xvf Xrotor7.55.tar.tgz
cd Xrotor/
patch -p1 < Xrotor7.55-makefile.patch
cd plotlib/ && make
cd ../bin/ && make


Answered By - Knud Larsen
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