diff --git a/cc/check.go b/cc/check.go
index 4e9e160..46328e9 100644
--- a/cc/check.go
+++ b/cc/check.go
@@ -38,6 +38,11 @@
 			ctx.PropertyErrorf(prop, "Illegal flag `%s`", flag)
 		} else if flag == "--coverage" {
 			ctx.PropertyErrorf(prop, "Bad flag: `%s`, use native_coverage instead", flag)
+		} else if flag == "-Weverything" {
+			if !ctx.Config().IsEnvTrue("ANDROID_TEMPORARILY_ALLOW_WEVERYTHING") {
+				ctx.PropertyErrorf(prop, "-Weverything is not allowed in Android.bp files.  "+
+					"Build with `m ANDROID_TEMPORARILY_ALLOW_WEVERYTHING=true` to experiment locally with -Weverything.")
+			}
 		} else if strings.Contains(flag, " ") {
 			args := strings.Split(flag, " ")
 			if args[0] == "-include" {