[check] Check for "(\ref", recommend \iref

Author: jensmaurer

tools/check-source.sh

@@ -85,6 +85,10 @@ grep -n 'ucode{[^}]*[^0-9a-f}][^}]*}' $texfiles |
 grep -n 'unicode{[^}]*[^0-9a-f}][^}]*}' $texfiles |
     fail 'use lowercase hex digits inside \\unicode' || failed=1
 
+# Use \iref instead of "(\ref", except for subclause ranges
+grep -n '.(\\ref' $texfiles  | grep -v -- "--" |
+    fail 'use \\iref instead of (\\ref' || failed=1
+
 # Use \xrefc instead of "ISO C x.y.z"
 grep -n "^ISO C [0-9]*\." $texfiles |
     fail 'use \\xrefc instead' || failed=1