[CMake] problem with CHECK_FUNCTION_EXISTS() and CMAKE_REQUIRED_LIBRARY

[Brad King]

Alexander Neundorf wrote:
> I want to check for a function which isn't part of libc, but of libutil. 
> I tried this: 
>  
> INCLUDE(CheckFunctionExists) 
> SET(CMAKE_REQUIRED_LIBRARIES util) 
> CHECK_FUNCTION_EXISTS(openpty "" HAVE_OPENPTY) 
> #SET(CMAKE_REQUIRED_LIBRARIES) # should I reset it here again ? 
> MESSAGE(STATUS "have_openpty: ${HAVE_OPENPTY}") 
>  
> But this produces the following output: 
>  
> ~/src/tests/crypt$ cmake . 
> -- Looking for openpty 
> CMake Error: The source directory "CMAKE_FLAGS" does not exist. 
> Specify --help for usage, or press the help button on the CMake GUI. 
> CMake Error: Internal CMake error, TryCompile configure of cmake failed 
> -- Looking for openpty - not found 
> -- have_openpty: 
> -- Configuring done 
> ~/src/tests/crypt$ 
>  
> What am I doing wrong here ? 

I think this may be a bug.  Please file a report, and also include in 
the entry a request for better testing of the modules.

Thanks,
-Brad