On 20/04/2020 16:51, Duncan Murdoch wrote:
I've just installed R version 4.0.0 RC (2020-04-18 r78249) and am
checking a package on MacOS High Sierra (10.13.6). I can't install the
recommended version of Xcode on this MacOS version. I'm currently using
Xcode 9.2. (I think Xcode 10.x is supposed to work on High Sierra, but
it isn't obvious how to update.)
My package has a small amount of C code, and R CMD check is clean, but R
CMD check --as-cran gives this NOTE:
* checking compilation flags used ... NOTE
Compilation used the following non-portable flag(s):
‘-mmacosx-version-min=10.13’
I didn't supply that, it's the default, so probably this note should not
appear (even though the message is true).
The customizations for R CMD check are in the 'R Internals' manual.
That would have shown that you needed
setenv _R_CHECK_COMPILATION_FLAGS_KNOWN_ "-mmacosx-version-min=10.13"
It is too late for 4.0.0 but in any case I would be reluctant to include
that in the 'known good' flags. What is not at all clear is which
compilers support it (even on macOS) -- it seems to be in the LLVM
version of clang but undocumented (like so many clang flags).
--
Brian D. Ripley, rip...@stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford
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