Test if compilation appears possible. This is used in some
examples, and tries compiling a trivial C program with
pkgbuild. Results are cached between runs within a session
so this should be fast to rely on.
Be verbose when running commands?
Try again to compile, skipping the cached value?
pkgbuild in order to build packages, and it includes a
set of heuristics to locate and organise your C compiler. The most
likely people affected here are Windows users; if you get this
ensure that you have rtools installed. Using
debug = TRUE may be helpful for
diagnosing compiler issues.
A logical scalar
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