[MacPorts] #34831: eliminate missing symbols from gdb compatible compilers

[MacPorts]

#34831: eliminate missing symbols from gdb compatible compilers
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 Reporter:  sean.michael.farley@…          |       Owner:  macports-tickets@…                                                                                                                                                                                    
     Type:  defect                         |      Status:  new                                                                                                                                                                                                   
 Priority:  Normal                         |   Milestone:                                                                                                                                                                                                        
Component:  ports                          |     Version:  2.1.1                                                                                                                                                                                                 
 Keywords:                                 |        Port:  apple-gcc40,apple-gcc42,gcc42,gcc43,gcc44,gcc45,gcc46,gcc47,gcc48,clang-2.9,clang-3.0,clang-3.1,clang-3.2,dragonegg-3.0,dragonegg-3.1,dragonegg-3.2,llvm-2.9,llvm-3.0,llvm-3.1,llvm-3.2,llvm-gcc42,g95
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 The hundreds of lines of output of missing object files causes much grief
 and, in some cases, will prevent debugging entirely.

 The goal of this patch is to completely get rid of all warnings and errors
 due to missing symbols. The importance of this is high since all compilers
 are effected and this in turn affects *any* user compiled code.

 For compilers that are gdb compatible (c, c++, and fortran), the portfile
 needs to keep the debug symbols. This patch fixes dsymutil being called
 for apple-gcc4{0,2}, gcc4{2,3,4,5,6,7,8}, {clang,llvm}-{2.9,3.0,3.1},
 llvm-gcc42, g95, and dragonegg-3.{0,1,2}. Alternatively, as suggested by
 Jeremy, each portfile could strip the symbols from the compiler's shared
 libraries. This could work but I don't know how to implement this method
 off the top of my head.

 Attached to this ticket is:

 1) patch that calls dsymutil for each port

 2) a simple test program

 3) the gdb output of (2)

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Ticket URL: <https://trac.macports.org/ticket/34831>
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