[MacPorts] #20889: llvm-gcc42: installs libgcc_s.1.dylib in ${prefix}/lib

[MacPorts]

#20889: llvm-gcc42: installs libgcc_s.1.dylib in ${prefix}/lib
-------------------------------------+--------------------------------------
 Reporter:  ryandesign@…             |       Owner:  erickt@…           
     Type:  defect                   |      Status:  new                
 Priority:  High                     |   Milestone:                     
Component:  ports                    |     Version:  1.7.1              
 Keywords:                           |        Port:  llvm-gcc42         
-------------------------------------+--------------------------------------
 llvm-gcc42 installs the file libgcc_s.1.dylib in ${prefix}/lib. This is a
 problem because any port that builds with gcc (i.e. most ports) links with
 libgcc_s.1.dylib -- supposed to be linking with the copy provided by
 Apple's gcc in /usr/lib but if llvm-gcc42 is installed it links with llvm-
 gcc42's version instead. This makes it basically impossible to remove
 llvm-gcc42 once it's been installed and other ports have subsequently been
 built.

 {{{
 $ port install zlib
 ...
 $ otool -L /opt/local/lib/libz.dylib
 /opt/local/lib/libz.dylib:
         /opt/local/lib/libz.1.dylib (compatibility version 1.0.0, current
 version 1.2.3)
         /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current
 version 1.0.0)
         /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
 version 111.1.4)
 $ port install llvm-gcc42
 ...
 $ port contents llvm-gcc42 | grep libgcc.*dylib
   /opt/local/lib/libgcc_s.1.dylib
   /opt/local/lib/libgcc_s.10.4.dylib
   /opt/local/lib/libgcc_s.10.5.dylib
   /opt/local/lib/libgcc_s_ppc64.1.dylib
   /opt/local/lib/libgcc_s_x86_64.1.dylib
 $ port -nf upgrade zlib
 ...
 $ otool -L /opt/local/lib/libz.dylib
 /opt/local/lib/libz.dylib:
         /opt/local/lib/libz.1.dylib (compatibility version 1.0.0, current
 version 1.2.3)
         /opt/local/lib/libgcc_s.1.dylib (compatibility version 1.0.0,
 current version 1.0.0)
         /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
 version 111.1.4)
 }}}

 It is wrong for ports (e.g. zlib) to make use of other ports (e.g. llvm-
 gcc42) that they haven't declared dependencies on. But it's not
 appropriate to modify every other port in the tree to either depend on
 llvm-gcc42 or work around this issue. Rather, llvm-gcc42 should install
 its libraries in a different place. Perhaps look at how the gcc4* ports
 handle this.

-- 
Ticket URL: <http://trac.macports.org/ticket/20889>
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