Caveat: I am somewhat new to CMake. I am programming a library to compute diagnostic statistics on VERY large data sets. (Possibly in parallel too.) The algorithm is numerically stable and online/streaming. The Fortran standard makes no guarantee of what (signed) integer types are available on a given system, but provides a means of requesting integers of different sizes and will let you know at run time whether or not they exist. However, kind (type) specification of variables must occur at compile time. (This isn't strictly true in F03/F08 but compiler support is limited ATM.) Since the algorithm is designed for extremely large data sets (9TB!) and the number of elements visited in the set so far appears in the algorithm, I would like to use the largest available integer kind to keep track of this quantity so that it doesn't overflow.
I think what I need to do is create a test program and use try_run() and then configure_file(), which leads me to my questions: 1. Can I have a multiple source file program and pass it to try_run()? It seems like the answer is no. 2. Since Fortran has no concept of a return value (not formally as far as the standard is concerned) it looks like I need to pass the information about available kind types in the RUN_OUTPUT_VARIABLE back to CMake and manipulate it there. Does this variable just get populated with a string which is whatever your code (that you try_ran) outputs to stdout? 3. Has someone written a module to diagnose available Fortran kind types? That they're willing to share? 4. If not, where do I look for advice and best practices to write one myself? TIA, Izaak Beekman =================================== (301)244-9367 Princeton University Doctoral Candidate Mechanical and Aerospace Engineering ibeek...@princeton.edu UMD-CP Visiting Graduate Student Aerospace Engineering ibeek...@umiacs.umd.edu ibeek...@umd.edu
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