CRAN warning: locale code page other than 65001 ("UTF-8") may cause problems

[jangorecki]

At the moment observed only on r-devel-windows-x86_64.
Note that test failures seen in below log are reported in other issue and are not related to locale warning AFAIK.

  Sat Sep 30 11:06:59 2023 endian==little, sizeof(long double)==16, longdouble.digits==64, sizeof(pointer)==8, TZ==unset, Sys.timezone()=='Europe/Berlin', Sys.getlocale()=='LC_COLLATE=C;LC_CTYPE=German_Germany.utf8;LC_MONETARY=C;LC_NUMERIC=C;LC_TIME=C', l10n_info()=='MBCS=TRUE; UTF-8=TRUE; Latin-1=FALSE; codepage=65001; system.codepage=65001', getDTthreads()=='OpenMP version (_OPENMP)==201511; omp_get_num_procs()==48; R_DATATABLE_NUM_PROCS_PERCENT==unset (default 50); R_DATATABLE_NUM_THREADS==unset; R_DATATABLE_THROTTLE==unset (default 1024); omp_get_thread_limit()==2; omp_get_max_threads()==48; OMP_THREAD_LIMIT==2; OMP_NUM_THREADS==unset; RestoreAfterFork==true; data.table is using 2 threads with throttle==1024. See ?setDTthreads.', zlibVersion()==1.2.13 ZLIB_VERSION==1.2.13
  Error in test.data.table() :
    4 errors out of 9906. Search tests/tests.Rraw for test numbers: 1962.0473, 2040.1, 2040.2, 2067.4.
  In addition: Warning messages:
  1: In Sys.setlocale("LC_CTYPE", "Chinese (Simplified)_China.936") :
    using locale code page other than 65001 ("UTF-8") may cause problems
  2: In (function (category = "LC_ALL", locale = "") :
    using locale code page other than 65001 ("UTF-8") may cause problems

[MichaelChirico]

Probably we should just suppressWarnings() since this is in tests, any "problems" would be detected by a test failure. Alternatively, we might check if the "new" (4.2.0) Sys.setlanguage() will work for those tests.

[jangorecki]

fix already in hotfix patch branch