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On Apr 11, 2007, at 3:10 PM, Fabian Groffen wrote:
> Yes we can!
> This was Solaris, Linux works the same. Now let's check Darwin.
> Same test program.
> Ok, prefix paths. Darwin is MACH-O, which stores the full filename to
> the library in this case, so no rpath is there. chrpath doesn't work
> here for that reason, but on Darwin, there is the install_name_tool
> So, install_name_tool does it a bit different than chrpath, but with
> some scripting both can do the same: change the location libraries are
> looked for. What does this mean? Well, let's look at this:
> [tefnut:/var/tmp] % install_name_tool -change /Library/Gentoo/usr/
> lib/libssl.0.9.8.dylib /var/tmp/libssl.0.9.8.dylib test
> [tefnut:/var/tmp] % cp /Library/Gentoo/usr/lib/libssl.0.9.8.dylib .
> [tefnut:/var/tmp] % ./test
> OpenSSL 0.9.8e 23 Feb 2007
> [tefnut:/var/tmp] % otool -L test
> /var/tmp/libssl.0.9.8.dylib (compatibility version 0.9.8,
> current version 0.9.8)
> (compatibility version 0.9.8, current version 0.9.8)
We use this feature, on Darwin, at lot at my company. It's important
to note that most binaries, on Darwin, may need to be compiled with "-
headerpad_max_install_names" -- which is actually now antiquated / 32-
bit only -- or, better "-headerpad [value]".
This option is needed for the cases where it's not /Y/Z -> /A/B but /
Y/Z -> /A...A/B...B .
The fun starts with -headerpad_max_install_names when some apps think
you're monkeying too much with the linkage options, and start to make
only static versions.
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