setup_rtools: Find rtools.
Description
To build binary packages on windows, Rtools (found at
http://cran.r-project.org/bin/windows/Rtools/) needs to be on
the path. The default installation process does not add it, so this
script finds it (looking first on the path, then in the registry).
It also checks that the version of rtools matches the version of R.Usage
setup_rtools(cache = TRUE, debug = FALSE)
Arguments
cache
if TRUE
will used cached version of RTools.
debug
if TRUE
prints a lot of additional information to
help in debugging.
Value
- Either a visible
TRUE
if rtools is found, or an invisible
FALSE
with a diagnostic message
.
As a side-effect the internal package variable rtools_path
is
updated to the paths to rtools binaries.
Acknowledgements
This code borrows heavily from RStudio's code for finding rtools.
Thanks JJ!