[CMake] Correct way to link with libstdc++ from non-C++ project?

[Michael Wild]

On 09/15/2011 06:39 PM, Jed Brown wrote:
> Suppose project Foo depends on a library Bar that uses C++ internally,
> but was not properly linked, so foo would need to be linked with
> 
> 1. $CC -shared -o libfoo.so *.o -lbar -lstdc++
> 
> or
> 
> 2. $CXX -shared -o libfoo.so *.o -lbar
> 
> 
> Note that
> 
> find_library (LIBSTDCXX NAMES stdc++)
> 
> does not work because this library is often not in a public directory,
> so a full path cannot be resolved. My understanding is that current
> recommended practice is to use option 2 above, but this breaks down if
> Foo also needs to link some Fortran libraries because you can't link
> using both the C++ compiler and the Fortran compiler.
> 
> If the Fortran and C++ compilers come from the same suite, passing a
> literal "-lstdc++" will generally work, but this is not robust if they
> come from different suites. Is there a way to mark a library as
> depending on a language or some other internal compiler library, so that
> CMake will sort out how to do the multi-language link in the same way it
> does if the project has source files in each language?
> 

Just set the LINKER_LANGUAGE target property to CXX.

HTH

Michael