[CMake] cmake FortranCInterface test fails in a linking step due to the -rdynamic option in Linux-GNU.cmake

[Brad King]

On 1/8/2015 1:30 PM, Brad King wrote:
> The Linux-GNU module's behavior should not be getting invoked
> for XL Fortran because the Fortran compiler id is "XL", not "GNU".
> 
> I'd like to understand how the option makes it to the link line:

To follow up on-list, it turns out that CMakeFortranInformation.cmake
was initializing the CMAKE_SHARED_LIBRARY_LINK_Fortran_FLAGS value
from the C version since no platform modules set it explicitly for
XL Fortran.  The fix is:

 XL: Fix link flags for executables on Linux with XL compilers
 http://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=4729547a

-Brad