Merge tag '2.1.2'

buildroot/bin/opt_enable

@@ -3,11 +3,13 @@
 # exit on first failure
 set -e
 
-SED=$(which gsed || which sed)
+SED=$(which gsed sed | head -n1)
 
 for opt in "$@" ; do
-  # Logic for returning nonzero based on answer here: https://stackoverflow.com/a/15966279/104648
-  eval "${SED} -i '/\(\/\/\)*[[:blank:]]*\(#define \b${opt}\b\)/{s//\2/;h};\${x;/./{x;q0};x;q9}' Marlin/Configuration.h" ||
-  eval "${SED} -i '/\(\/\/\)*[[:blank:]]*\(#define \b${opt}\b\)/{s//\2/;h};\${x;/./{x;q0};x;q9}' Marlin/Configuration_adv.h" ||
-  (echo "ERROR: opt_enable Can't find ${opt}" >&2 && exit 9)
+  DID=0 ; FOUND=0
+  for FN in Configuration Configuration_adv; do
+    "${SED}" -i "/^\(\s*\)\/\/\(\s*\)\(#define\s\+${opt}\b\)\( \?\)/{s//\1\2\3\4\4\4/;h};\${x;/./{x;q0};x;q9}" Marlin/$FN.h && DID=1
+    ((DID||FOUND)) || { grep -E "^\s*#define\s+${opt}\b" Marlin/$FN.h >/dev/null && FOUND=1 ; }
+  done
+  ((DID||FOUND)) || (echo "ERROR: $(basename $0) Can't find ${opt}" >&2 && exit 9)
 done