[R-pkg-devel] compilation flags WARNING

El jue., 5 jul. 2018 a las 16:11, G?ran Brostr?m
(<goran.brostrom at umu.se>) escribi?:
I am preparing a CRAN release of eha (a trivial change due to a change
in the survival package), but when checking the build I get:

goran at M6800:~/R$ R CMD check --as-cran eha_2.5.2.tar.gz
...
* checking compilation flags used ... WARNING
Compilation used the following non-portable flag(s):
   ?-Wdate-time? ?-Werror=format-security? ?-Wformat?
...
AFAIK, these are new checks. I get similar warnings on Fedora for
different flags.

I have never seen this before and I haven't (to my knowledge) set any
compilation flags. It is my first build and check on a newly upgraded
ubuntu 18.04 (no issues on 17.10). Should I perhaps ask on r-sig-debian,
or is that observation irrelevant?
Again AFAIK (there are package maintainers for several distros here
that can correct me if I'm wrong), each distro defines some policies
regarding compilation flags that are applied to all packages by
default. So these warnings can be safely ignored locally (or you may
override them), because those flags won't be defined on CRAN.

Yes, by default the compilation flags are those set when R was installed. You can see the current flags via

R CMD config CFLAGS

which in your case should include  ?-Wdate-time? etc.

As I?aki says you can safely ignore the warning, but if you prefer to not to have any warnings you can solve this by creating a Makevars.site file with CFLAGS excluding the non-portable ones, e.g.

CFLAGS=-Wall -g O0 -fPIC

This should be saved in the /etc directory of R.home(), e.g. /usr/lib/R/etc.

See https://cran.r-project.org/doc/manuals/r-release/R-admin.html#Customizing-package-compilation for more information.

Heather
I?aki

G?ran Brostr?m

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[R-pkg-devel] compilation flags WARNING

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