[R-pkg-devel] Solaris SPARC, Fortran, and logical errors?
On Wed, Mar 15, 2017 at 12:19 PM, William Dunlap <wdunlap at tibco.com> wrote:
I don't know about the current Sparc Fortran compilers, but over the years have learned not to try to pass logicals and character strings between C and Fortran. I have seen Fortran compilers that treated integer -1 (all bits 1) as .true. and anything else as .false. and I have see ones that looked only at bit 7, counting from the right, to determine the value. I recommend changing your Fortran code to accept an integer instead of a logical for boolean inputs and outputs.
Posting for posterity's and future similar questions' sakes [1], I am relieved to find that removing reliance on the Fortran 2003 ISO_C_binding of c_bool, casting logicals explicitly as integers of 0 or 1, and testing for those integers in Fortran, seems to have finally sated the SPARCmonster's appetite. [2] Thank you very much! Avi [1] https://xkcd.com/979/ [2] https://cran.r-project.org/web/checks/check_results_Delaporte.html - Version 6.0.0