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A general description is here.
‘checkFF()’ (called by ‘R CMD check’ by default) can optionally check foreign function calls for consistency with the registered type and argument count. This is the default for ‘R CMD check --as-cran’ or can be enabled by setting environment variable ‘_R_CHECK_FF_CALLS_’ to ‘registration’ (but is in any case suppressed by ‘--install=no’). Because this checks calls in which ‘.NAME’ is an R object and not just a literal character string, some other problems are detected for such calls.
Functions ‘suppressForeignCheck()’ and ‘dontCheck()’ have been added to allow package authors to suppress false positive reports.