MadGraph5_aMC@NLO

Compilation error with subprocesses

Asked by Emma Tintinger

Can someone help me figure out what to do about this error? To fix this error, I have tried redownloading Madgraph and reinstalling pythia8, delphes, etc but I keep running into issues installing many of those programs (eMELA, MadAnalysis5, Delphes, and lhapdf didn't work for me I think) so I wasn't able to go forward with that approach. I also tried to update cmake and I tried deleting Xcode and downloading a newer beta version but I think that might have made things worse. Please help, I think I'm just making more problems.

ERROR MESSAGE:
Error detected in "generate_events run_01"

str : A compilation Error occurs when trying to compile /Users/emmatintinger/Downloads/MG5_aMC_v3_5_0/:?/SubProcesses/P1_gg_ttx.
 The compilation fails with the following output message:
     gfortran -o gensym symmetry.o idenparts.o -L../../lib/ -L../../lib/ -ldhelas -ldsample -lmodel -lgeneric -lpdf -lgammaUPC -lcernlib -lbias -lc++ -mmacosx-version-min=10.8
     ld: unsupported tapi file type '!tapi-tbd' in YAML file '/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk/usr/lib/libSystem.tbd' for architecture arm64
     collect2: error: ld returned 1 exit status
     make: *** [gensym] Error 1

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

My advise is to
1) remove any instance of gfortran/gcc on your system
2) remove all previously compiled code (madgraph/fastjet/...)
3) re-install gcc and gfortran from here: https://hpc.sourceforge.net/
4) be sure that all binary are correctly pointing on those and not on some other version of ld/gcc/g++/....
5) reinstall everything. (lhapdf can be tricky due to a python issue, I did install by hand so far since I fail to find a good way to install it via the install command)

Cheers,

Olivier

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