[CMake] Use FIND_LIBRARY to search & link for an executable?

[Hendrik Sattler]

Zitat von Christian Ehrlicher <Ch.Ehrlicher at gmx.de>:

>> Von: Michael Wild
>>
>> On 18. Sep, 2009, at 8:14, Christian Ehrlicher wrote:
>>
>> > Hi,
>> >
>> > I've an external project which made the decision to create an
>> > executable which exports symbols. This means if you want to write a
>> > plugin for this project you have to link your plugin against this
>> > executable.
>> > Now I've the problem that FIND_LIBRARY doesn't find this executable.
>> > Does anybody knows a hack to be able to link against an executable
>> > which is not built by the project?
>> >
>> > I'm really lost here but I can't convince them to fix it... :(
>> > Managing an own patch to work around this problem isn't a good long-
>> > term perspective.
>> >
>> > Thx,
>> > Christian
>>
>> find_program?
>>
> You're right - I did not know that TARGET_LINK_LIBRARIES accepts this.
>> And that is a REALLY broken design (and AFAIK only works on Windows).
>>
> I'm currently investigating and think it doesn't work on linux at   
> all (which would be very good for me). I'm getting duplicate symbols  
>  :)
>
> -->
> FIND_PROGRAM(STAGE_LIB STAGE PATHS /opt/3dviewer/bin)
> ADD_LIBRARY(dummy SHARED dummy.cpp)
> TARGET_LINK_LIBRARIES(dummy ${STAGE_LIB})

Actually, you are compiling a loadable MODULE, not a library (which  
happens to be the same on Linux but not on other platforms).

> -->
> /usr/local/bin/c++  -fPIC -g  -shared -Wl,-soname,libdummy.so -o   
> libdummy.so CMakeFiles/dummy.dir/dummy.cpp.o /opt/3dviewer/bin/STAGE
> /opt/3dviewer/bin/STAGE: In function `_fini':
> /usr/src/packages/BUILD/glibc-2.9/cc-nptl/csu/crti.S:37: multiple   
> definition of `_fini'
> /usr/lib64/gcc/x86_64-suse-linux/4.3/../../../../lib64/crti.o:/usr/src/packages/BUILD/glibc-2.9/cc-nptl/csu/crti.S:37: first defined   
> here
> /opt/3dviewer/bin/STAGE: In function `_init':
> /usr/src/packages/BUILD/glibc-2.9/cc-nptl/csu/crti.S:25: multiple   
> definition of `_init'
> /usr/lib64/gcc/x86_64-suse-linux/4.3/../../../../lib64/crti.o:/usr/src/packages/BUILD/glibc-2.9/cc-nptl/csu/crti.S:25: first defined   
> here

Read the section "The obsolete symbols _init and _fini" in the  
dlopen(3) manpage.

> /usr/lib64/gcc/x86_64-suse-linux/4.3/../../../../x86_64-suse-linux/bin/ld:   
> libdummy.so: version node not found for symbol vtable for   
> __cxxabiv1::__class_type_info@@CXXABI_1.3
> /usr/lib64/gcc/x86_64-suse-linux/4.3/../../../../x86_64-suse-linux/bin/ld:   
> failed to set dynamic section sizes: Bad value
> collect2: ld returned 1 exit status
> -->

Are you using the same compiler with same version for plugin and executable?

HS