[R-pkg-devel] spurious rchk warning

[Joshua Ulrich]

On Mon, Nov 20, 2017 at 8:34 PM, Patrick Perry <pperry at stern.nyu.edu> wrote:
> One of my packages has what I believe to be spurious rchk warnings:
>
> From
> https://raw.githubusercontent.com/kalibera/cran-checks/master/rchk/results/utf8.out
>
> Package utf8 version 1.1.0
> Package built using 73757/R 3.5.0; x86_64-pc-linux-gnu; 2017-11-20 22:02:23
> UTC; unix
> Checked with rchk version 63f79d910f5835174fcaa5a0a7d2409348f7d2ac
> More information at
> https://github.com/kalibera/cran-checks/blob/master/rchk/PROTECT.md
>
> Function rutf8_as_utf8
>   [UP] unprotected variable ans while calling allocating function
> R_CheckUserInterrupt utf8/src/as_utf8.c:68
>   [UP] unprotected variable ans while calling allocating function
> rutf8_translate_utf8 utf8/src/as_utf8.c:83
>   [UP] unprotected variable ans while calling allocating function
> Rf_mkCharLenCE utf8/src/as_utf8.c:117
>
> The offending function is at
> https://github.com/patperry/r-utf8/blob/master/src/as_utf8.c#L46
>
> I tried to fix the warning in line 64 with
>
> PROTECT(ans = sx); nprot++;
>
> This did not work. Any suggestions?
>
My hypothesis is that your PROTECT and UNPROTECT calls inside the for
loop are leaving 'ans' unprotected at some point.  Consider using
PROTECT_WITH_INDEX() and REPROTECT() instead.

> Thanks,
>
>
> Patrick
>
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