[CMake] TARGET_LINK_LIBRARIES with full path libraries

[Nils Gladitz]

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