Setup:

• Win 10 Enterprise 10.0.19043
• OSGeo4W
• GRASS 7.8.6
• R 4.1.1 64 bit
• rgrass7 0.2-6; rgdal 1.5-27; raster 3.5-2; sp 1.4-5; sf 1.0-3
• RStudio 1.4.1717 launched from the OSGeo4W shell
• working within an RStudio project folder that contains an existing GRASS location in a subfolder

library(rgrass7)

initGRASS(gisBase  = file.path('C:', 'OSGeo4W', 'apps', 'grass', 'grass78'),
          gisDbase = file.path(getwd(), 'data_spatial'),  location = 'grass_data', 
          mapset   = "PERMANENT", override = TRUE)

produces the following warning:

Warning message:

> In system(syscmd, intern = intern, ignore.stderr = ignore.stderr,  :
    running command 'g.proj.exe -w' had status 884

This doesn't happen when initialising a new grass location, (e.g. in R's temp file area), only when accessing an existing one. Using gmeta() also produces the same warning. I think I've traced the issue to here, https://github.com/rsbivand/rgrass7/blob/5801ed574b6aef6da272d9dbd1939770c21879e9/R/rgrass.R#L110

specifically the use of intern = TRUE. I think the error handling line that follows isn't catching this issue, because a simple status of 884 is returned rather than anything including the word 'ERROR'. I can't find an explanation of what status 884 implies.

This effect persists whether an RStudio project is active or not, and the same issue arises if I launch RStudio normally and use my own initialization script. Everything else seems to work fine, and I have been working with this location across several previous versions of R and GRASS without this message appearing.