[CMake] Cmake MacOSX Question

[William A. Hoffman]

This sounds very familiar.  I think we figured it out once before, and talked
about making this flag the default on OSX.  Does that sound like a good idea?


-Bill

At 11:09 PM 6/24/2006, Hans Johnson wrote:
>Brad,
>
>Thanks for all your suggestions. They put me onto the correct path to
>figuring out what was going on.  Close inspection of the man page for ld on
>MacOSX indicates why the strange behavior was occuring.
>
> 
>
>-search_paths_first
>         By  default  when  the  -dynamic  flag is in effect, the -lx and
>        -weak-lx  options  first  search  for  a  file   of   the   form
>        `libx.dylib'  in each directory in the library search path, then
>        a file of the form `libx.a'  is  searched  for  in  the  library
>        search  paths.   This  option  changes  it  so that in each path
>        `libx.dylib' is searched for then `libx.a' before the next  path
>        in the library search path is searched.
>
>
>Thanks,
>Hans
>
>
>
>
>On 6/23/06 12:49 PM, "Brad King" <brad.king at kitware.com> wrote:
>
>> Hans J. Johnson wrote:
>>> Here is the output.  I am still perplexed as to why the tcl and tk libraries
>>> from the framework (or /usr/lib) are being included.
>> [snip]
>>>  /usr/libexec/gcc/powerpc-apple-darwin8/4.0.1/collect2 -dynamic -arch ppc
>>> -bind_at_load -headerpad_max_install_names -macosx_version_min 10.3
>>> -multiply_defined suppress -weak_reference_mismatches non-weak -o
>>> ../bin/brains2 -lcrt1.o /usr/lib/gcc/powerpc-apple-darwin8/4.0.1/crt2.o
>>> /usr/lib/gcc/powerpc-apple-darwin8/4.0.1/crt3.o
>>> -L/scratch/hjohnson/src/brains2/MacOSX/FAST/src/lib/InsightToolkit
>>> -L.
>>> -L/scratch/hjohnson/src/brains2/MacOSX/FAST/src/lib
>>> -L/usr/X11R6/lib
>>> -L/sw/lib
>>> -L/usr/lib/gcc/powerpc-apple-darwin8/4.0.1
>>> -L/usr/lib/gcc/powerpc-apple-darwin8/4.0.1
>>> -L/usr/lib/gcc/powerpc-apple-darwin8/4.0.1/../../..
>> [snip]
>>> -ltcl8.4 -ltk8.4
>> 
>> The libtcl8.4.so in /usr/lib is probably a symlink to the framework one.
>>   I wonder if the current working directory of the collect2 process as
>> started by gcc is /usr/lib, so that the -L. is picking up the files from
>> there.  Try taking off the -L. from the command line of /usr/bin/c++.
>> 
>> Also note that the path
>> -L/usr/lib/gcc/powerpc-apple-darwin8/4.0.1/../../.. is actually
>> /usr/lib.  Perhaps the linker is searching backwards somehow?
>> 
>> Alternatively the linker could be searching the entire path for a shared
>> library and then searching the entire path for a static library.  Since
>> it finds libtcl8.4.so in /usr/lib it doesn't ever look for libtcl8.4.a.
>>   Try changing TCL_LIBRARY to "-Wl,-Bstatic -ltcl8.4 -Wl,-Bdynamic".
>> 
>> -Brad
>
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