[MacPorts] #29838: Generate shared libraries what can be processed with install_name_tool (one step toward shared library relocation)

[MacPorts]

#29838: Generate shared libraries what can be processed with install_name_tool (one
step toward shared library relocation)
--------------------------------+-------------------------------------------
 Reporter:  gellule.xg@…        |       Owner:  macports-tickets@…                   
     Type:  enhancement         |      Status:  new                                  
 Priority:  Normal              |   Milestone:                                       
Component:  base                |     Version:  1.9.2                                
 Keywords:                      |        Port:                                       
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 "install_name_tool" changes dynamic shared library install names and/or
 adds, changes or deletes the rpaths recorded in a Mach-O binary.  For this
 tool to work when the install names or rpaths are larger the binary should
 be built with the ld "headerpad_max_install_names" option. This tool can
 therefore be used to relocate a shared library outside of the macports
 tree.

 The purpose of this ticket is to add to LDFLAGS the
 "-Wl,-headerpad_max_install_names" option for all ports. A simple approach
 would be to modify portconfigure.tcl by setting "default
 configure.ldflags" to:
 {{{
 default configure.ldflags {"-L${prefix}/lib
 -Wl,-headerpad_max_install_names"}
 }}}

 I haven't been able to identify a drawback to this default addition.

 There is a thread related to this issue that mentions the fact that some
 ports do erase the default ldflags: [http://lists.macosforge.org/pipermail
 /macports-dev/2011-March/thread.html#14202]

 This addition helps with relocation, but does not guarantee it: there
 could well be other aspects of the built libraries that are not compatible
 with a relocation.

-- 
Ticket URL: <https://trac.macports.org/ticket/29838>
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