Command line parameters follow Unix conventions, one hyphen (minus) for one 
letter options like -d:release, two hyphens for multiletter options like 
--threads:on.

See "nim --fullhelp" for a list of all (documented) command line parameters.

\--experimental is a valid command line parameter, but I am not sure if it is 
identical to pragma use. nim.cfg can contain parameters, for example|   
---|---  
      
    
    path:"$projectdir"
    nimcache:"/tmp/$projectdir"
    gcc.options.speed = "-march=native  -O3  -flto -fstrict-aliasing"
    #gcc.options.speed = "-save-temps -march=native -O3  -fstrict-aliasing"
    #gcc.options.speed = "-march=native -O3 -g -fno-strict-aliasing"
    
    
    
    Run

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