[MacPorts] #33821: base: add a default +debug and +no_opt variant

[MacPorts]

#33821: base: add a default +debug and +no_opt variant
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 Reporter:  sean.michael.farley@…          |       Owner:  macports-tickets@…                   
     Type:  enhancement                    |      Status:  new                                  
 Priority:  Normal                         |   Milestone:                                       
Component:  base                           |     Version:  2.0.4                                
 Keywords:                                 |        Port:                                       
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 This patch adds a default +debug variant that will build packages with -g
 and, more importantly, run the dsymutil tool to keep the debugging
 symbols. Additionally, there is a +no_opt variant that will try to delete
 all -O{1,2,3} flags and add -O0. Of course, individual packages can
 override what +debug and +no_opt will do, but as a base
 default, this seems sensible to have so that a user can get debugging
 symbols for gdb easily without having to edit a package's Portfile.

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Ticket URL: <https://trac.macports.org/ticket/33821>
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