tweaks, including centralizing list of C++ standards

git-svn-id: https://svn.r-project.org/R/trunk@89279 00db46b3-68df-0310-9c12-caf00c1e9a41

Author: ripley

doc/NEWS.Rd

@@ -519,7 +519,7 @@
       \file{src/Makevars*} and in the \code{SystemRequirements} field of
       the \file{DESCRIPTION} file) are now checked more thoroughly.
       Invalid values are still ignored but now give a warning, as do
-      contradicting specifications.
+      contradictory specifications.
     }
   }
 

src/library/tools/R/check.R

@@ -6557,9 +6557,13 @@ add_dummies <- function(dir, Log)
                 if (length(line)) {
                     checkingLog(Log, "C++ specification")
                     std <- as.numeric(sub("specified C[+][+]", "", line))
-                    if (!(std %in% c("17", "20", "23", "26")))
+                    if ((std %in% c("98", "11", "14")))
                          noteLog(Log,
-                                sprintf("  Unknown/obsolate C++%d standard request will be ignored", std))
+                                 sprintf("  Obsolete C++%d standard request will be ignored", std))
+                    ## cxx_standards is set in install.R
+                    else if (!(std %in% cxx_standards))
+                         noteLog(Log,
+                                sprintf("  Unknown C++%d standard request will be ignored", std))
                     ## since R 4.4.0 C++17 support is required, but
                     ## C++23/26 support is patchy
                     else if (std >= 23) {