grep 3.8 warns about stray '\' before some characters
After updating grep to 3.8 on Arch Linux, warnings of this type appear:
Running gtkdocize --copy...
grep: warning: stray \ before ,
grep: warning: stray \ before white space
and
DOC Introspecting gobjects
grep: warning: stray \ before -
DOC Building XML
DOC Building HTML
grep: warning: stray \ before -
grep: warning: stray \ before -