[cmake-developers] [CMake 0015047]: BundleUtilities' fixup_bundle does not check to see if two libs are the same up to symlinks

[Mantis Bug Tracker]

The following issue has been SUBMITTED. 
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http://public.kitware.com/Bug/view.php?id=15047 
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Reported By:                Jordi Gutiérrez Hermoso
Assigned To:                
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Project:                    CMake
Issue ID:                   15047
Category:                   Modules
Reproducibility:            have not tried
Severity:                   minor
Priority:                   normal
Status:                     new
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Date Submitted:             2014-07-30 13:30 EDT
Last Modified:              2014-07-30 13:30 EDT
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Summary:                    BundleUtilities' fixup_bundle does not check to see
if two libs are the same up to symlinks
Description: 
I'm using cmake's BundleUtilities to create an app bundle. I am using
homebrew's wxmac package to create an application of my own.

With wxmac, my binary links (amongst other things) to 

    /usr/local/lib/libwx_baseu-3.0.dylib
    /usr/local/lib/libwx_osx_cocoau_core-3.0.dylib

But /usr/local/lib/libwx_osx_cocoau_core-3.0.dylib itself also links
to libwx_baseu-3.0.dylib, but not to the symlink in /usr/local/lib but
to the original in /usr/local/Cellar which actually has a longer but
compatible version name: libwx_baseu-3.0.0.1.0.dylib (note the extra
dots in the version number). Of course, the 3.0.0.1.0 library is the
same as the 3.0 library, as the latter is jus a symlink to the former.

Thus BundleUtilities thinks that there is a dependency of a dependency
and copies the libwx_baseu library twice, once for 3.0 and again for
3.0.0.1.0 and sets the path twice in my binary.

This creates a segfaulty executable. :-(


Steps to Reproduce: 
It's a bit complicated to easily reproduce this. Basically, use fixup_bundle,
create a library that links both to foo.dylib and bar.dylib, and make sure that
bar.dylib is a symlink to baz.dylib and that foo.dylib itself links to baz.

In ASCII art:

    binary
    |     \
    |      \ 
    foo     bar ..... baz
    |                 |
    \_________________/

where the dots indicate a filesystem symlink and the solid lines indicate
dynamic library linking.

Additional Information: 
(aside: homebrew sets up symlinks in /usr/local/lib that point to the
actual wxmac libraries in /usr/local/Cellar/wxmac/3.0.1, similar to
how most GNU/Linux systems handle /usr/lib and /usr/local/lib )
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Issue History 
Date Modified    Username       Field                    Change               
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2014-07-30 13:30 Jordi Gutiérrez HermosoNew Issue                              
     
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