how to declare a variable globally which is used only in proc

Question

i am having a following code:

proc testList {setupFile ""} {
  if {$setupFile == ""} {
    set setupFile location
  }
}
proc run {} {
  puts "$setupFile"
}

I am getting syntax error. I know if i declare the setupFile variable outside the proc i.e in the main proc then i can append it with namespace say ::65WL::setupFile to make it global but not getting how to do that if a variable itself is defined in the proc only.

Answer 1

You can refer to the global namespace with ::.

proc testList {{local_setupFile location}} {
    # the default value is set in the arguments list.
    set ::setupFile $local_setupFile
}

proc run {} {
    puts $::setupFile
}