CRAN has a few warnings currently only visible with older clang on Mac. -Wformat on gcc and clang on Linux does not complain.
read_workbook.cpp:555:52: warning: format specifies type 'unsigned short' but the argument has type 'int' [-Wformat]
read_workbook.cpp:565:54: warning: format specifies type 'unsigned short' but the argument has type 'int' [-Wformat]
read_workbook.cpp:626:50: warning: format specifies type 'unsigned short' but the argument has type 'int' [-Wformat]
CRAN has a few warnings currently only visible with older clang on Mac.
-Wformat
on gcc and clang on Linux does not complain.