[CMake] TARGET_LINK_LIBRARIES with full path libraries

[J Decker]

can't just add link_directories(  /opt/XXX/lib ) ?

On Wed, Sep 17, 2014 at 3:58 AM, Nils Gladitz <nilsgladitz at gmail.com> wrote:

> On 09/17/2014 12:29 PM, Volker Pilipp wrote:
>
>> I have encountered the following problem with cmake 3.0.1.
>> Under certain circumstances TARGET_LINK_LIBRARIES replaces
>> "/path/to/libXXX.so" by "-lXXX". The problem occurred when I used a
>> non-standard compiler at /opt/XXX/bin/g++ and added the library
>> /opt/XXX/lib/libXXX.so to TARGET_LINK_LIBRARIES.
>> In particular CMakeLists.txt reads:
>>
>> "SET(CMAKE_CXX_COMPILER /opt/XXX/bin/g++)
>> CMAKE_MINIMUM_REQUIRED(VERSION 3.0.0)
>> PROJECT(XXX)
>> add_executable(xxx xxx.cpp)
>> target_link_libraries(xxx /opt/XXX/lib/libXXX.so)"
>>
>> When running make VERBOSE=1 produces output like
>>
>> /opt/XXX/bin/g++ (...) -lXXX
>>
>> which is not the same as
>> /opt/XXX/bin/g++ (...) /opt/XXX/lib/libXXX.so
>>
>
> I think CMake reverts to linking by name if either the library is in an
> implicit linker directory (e.g. a directory the linker searches by default)
> or if the shared library does not have an SONAME.
>
> Which library does -lXXX resolve to?
> e.g. why aren't the two command lines equivalent for you?
>
> Specifically which library does the linker (ld) pick up;
> not the runtime loader (ld.so).
>
> Nils
>
>
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