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A recent change to r-devel causes an R CMD check warning when a C file includes a "#pragma GCC diagnostic ignored" pragma: https://github.com/wch/r-source/commit/b76c8fd355a0f5b23d42aaf44a879cac0fc31fa4 . This causes the CRAN checks for the "corpus" package to emit a warning: https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-fedora-clang/corpus-00check.html .

Hi Patrick, It was recently added as a cran policy (thanks Dirk's cran policy watch: https://twitter.com/markvdloo/status/935810241190617088). It seems to be a general stricter policy on keeping to the C(++) standard. Warnings are there for a reason and should usually not be ignored. I'm not familiar with the warning you are suppressing but it seems likely that your code might assume type size that is not...