Handle circular dependency
diff --git a/exec.go b/exec.go
index b3bf07a..0ec02a6 100644
--- a/exec.go
+++ b/exec.go
@@ -18,7 +18,8 @@
shell string
vars Vars
- // target -> timestamp
+ // target -> timestamp, a negative timestamp means the target is
+ // currently being processed.
done map[string]int64
}
@@ -230,9 +231,13 @@
Log("Building: %s", output)
outputTs, ok := ex.done[output]
if ok {
+ if outputTs < 0 {
+ fmt.Printf("Circular %s <- %s dependency dropped.\n", neededBy, output)
+ }
Log("Building: %s already done: %d", output, outputTs)
return outputTs, nil
}
+ ex.done[output] = -1
outputTs = getTimestamp(output)
rule, present := ex.pickRule(output)
