[CMake] universal binary problems on mac

[Mike Jackson]

On Feb 6, 2007, at 10:39 AM, Bill Hoffman wrote:

> Hi,
>
> So, the mac we run our cmake dashboards was "updated".  This caused  
> the cmake dashboard to start to fail. The problem seems to be a  
> change in the behavior of the lipo command.  Note, Xcode was not  
> updated
>
> I think that this bug may have been fixed:
>
> http://lists.apple.com/archives/xcode-users/2006/Mar/msg00630.html
>
> Basically, the Xcode projects that cmake generates creates  
> universal binaries by building all the code twice, then it combines  
> static libraries into one "fat" library.  The error is as follows :
> http://www.cmake.org/Testing/Sites/dashmacmini2.kitware/Darwin- 
> Tiger-Xcode21-univ/20070206-0100-Nightly/BuildError.html
>
> /usr/bin/ld: warning -F: directory name (/.../CMake-Xcode/bin/ 
> Release) does not exist
> /usr/bin/ld: table of contents for archive: /.../CMake-Xcode/Source/ 
> Release/libCMakeLib.a is out of date; rerun ranlib(1) (can't load  
> from it)
> /usr/bin/ld: table of contents for archive: /.../CMake-Xcode/Source/ 
> kwsys/Release/libcmsys.a is out of date; rerun ranlib(1) (can't  
> load from it)
> *collect2: ld returned 1 exit status*
>
>
> I can add a build phase that runs ranlib after each library is  
> created if universal binaries are requested, but this will slow the  
> build. This seems like an Xcode bug.
>
> Have any of you OSX users out there seen this?
>
> The /usr/bin/lipo has a date of Aug 9 18:05 and is 149408 in size.
> The Xcode is 2.2.
>
>
> -Bill
>


There was recently some traffic on the Xcode users lists about  
building UB from Make/AutoTools based projects.

http://lists.apple.com/archives/Xcode-users/2007/Feb/msg00076.html

Basically Xcode builds each arch into its own subdirectory (i386-32,  
i386-64, ppc32, ppc64), then uses lipo to put together the resulting  
binaries. Maybe Cmake can take this approach also.

Also,
    There is a long thread at

http://lists.apple.com/archives/Xcode-users/2007/Jan/msg00304.html

that discusses how to build UB with AutoTools based projects. Pay  
attention to the posts by Bill Bumgarner as he works for Apple and he  
has been down this path before. He has extremely good advice about  
how to tackle this problem and what to look out for.

I know this does not actually answer the question at hand but does  
offer some advice.

Respectfully
-- 
Mike Jackson   Senior Research Engineer
Innovative Management & Technology Services