- grep -l '^'$name'[ (]' "$SRCDIR"/*.c | sed -n 1p | sed -e 's/^.*\/\([^.]*\)\.c/#ifdef __\1__/' >> $TAIL
- echo "#undef $name" >> $TAIL
+ ifdef=$(grep -l '^'$name'[ (]' "$SRCDIR"/*.c | sed -n 1p | sed -e 's/^.*\/\([^.]*\)\.c/__\1__/')
+ if [ -z "$ifdef" ] ; then
+ echo "error: could not locate $name in src/*.c" 1>&2
+ exit 1
+ fi
+ if [ "$ifdef" != "$last" ] ; then
+ [ -n "$last" ] && echo "#endif /* $last */" >> $TAIL
+ echo "#ifdef $ifdef" >> $TAIL
+ last=$ifdef
+ fi
+ echo "# undef $name" >> $TAIL