Dear all,
on a system with a cray compiler environment cmake fails to find a blas capable 
library via

        find_package(BLAS) 

The compilers on this system are wrappers which already link the local blas 
libraries (from the cray-libsci library). I guess this is why a call to

        check_fortran_function_exists(sgemm HAS_BLAS)
or
        check_function_exists(cblas_sgemm HAS_BLAS)

actually succeeds. (sgemm is a symbol from BLAS)

So the code requires blas functionality, but I can not just call 
find_package(BLAS) and then add the BLAS_LIBRARIES to the targets linker flags 
as on other platforms.
Do you think we should refine the FindBLAS.cmake to actually detect if blas is 
already be found by the compiler/linker and then set BLAS_FOUND to true and 
BLAS_LIBRARIES to an empty list?

Thanks for any thoughts about this,
Jan 
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