[R-pkg-devel] new package version fails on r-devel fedora clang

[Kevin Ushey]

Should we ask the LLVM team if they think it's worth handling the
SIGXCPU signal in an alternate way? Since the message they're printing
here implies it's a bug in the compiler... or at least, they could
print the signal number / signal name in the message log produced.
Unless I missed something?

In any case, I agree with the other suggestions re: splitting those
functions out into separate files.

Another thing worth trying would be to try porting some of these
functions from C++ to C -- as far as I can see, you aren't making use
of (any?) C++-specific features, beyond the automatic generation of
interfaces offered by Rcpp. You could even keep the C++ interfaces
auto-generated by Rcpp, but have those call back to separate C
functions each defined in separate files, just to keep life simple.

Best,
Kevin

On Tue, Oct 7, 2025 at 10:37 AM Dirk Eddelbuettel <edd using debian.org> wrote:
>
>
> On 7 October 2025 at 20:07, Ivan Krylov via R-package-devel wrote:
> | Clang is programmed to print a message saying "PLEASE submit a bug
> | report" when it receives an unexpected fatal signal. Here, the fatal
> | signal is SIGXCPU, delivered by the kernel because of the 90-minute
> | per-process CPU time limit set for the job [0]. This is not a crash,
> | you can see this for yourself using something like
> |
> | ( ulimit -S -t 2; R -q -s -e 'repeat runif(100)' )
> |
> | The bits of information we have are Ttotal=19394.68s [1], the R CMD
> | check output [2] saying that R CMD INSTALL tool 94 minutes of real time
> | but 323 minutes of userspace plus kernel CPU time, and 00install.log
> | saying that the processes being stopped for going over the limit are
> | compiling rcpp_bcRel_dec.cpp and rcpp_bc_int.cpp.
>
> Most excellent work. I suspected this, but was not careful enough: I looked
> for SIGKILL so 'today I learned' about SIGXCPU.
>
> My recommendation ended up being the same though: those files should to be
> smaller / simpler.
>
> Dirk
>
> --
> dirk.eddelbuettel.com | @eddelbuettel | edd using debian.org
>
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