diff --git a/audio/2.0/Android.bp b/audio/2.0/Android.bp
index 984a095..e833d99 100644
--- a/audio/2.0/Android.bp
+++ b/audio/2.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.audio@2.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.audio@2.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.audio@2.0",
     srcs: [
         "types.hal",
         "IDevice.hal",
@@ -28,8 +28,8 @@
 
 genrule {
     name: "android.hardware.audio@2.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.audio@2.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.audio@2.0",
     srcs: [
         "types.hal",
         "IDevice.hal",
diff --git a/audio/common/2.0/Android.bp b/audio/common/2.0/Android.bp
index a00e2bd..89ce3b6 100644
--- a/audio/common/2.0/Android.bp
+++ b/audio/common/2.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.audio.common@2.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.audio.common@2.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.audio.common@2.0",
     srcs: [
         "types.hal",
     ],
@@ -14,8 +14,8 @@
 
 genrule {
     name: "android.hardware.audio.common@2.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.audio.common@2.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.audio.common@2.0",
     srcs: [
         "types.hal",
     ],
diff --git a/audio/effect/2.0/Android.bp b/audio/effect/2.0/Android.bp
index a7b4131..a5f0c46 100644
--- a/audio/effect/2.0/Android.bp
+++ b/audio/effect/2.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.audio.effect@2.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.audio.effect@2.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.audio.effect@2.0",
     srcs: [
         "types.hal",
         "IAcousticEchoCancelerEffect.hal",
@@ -42,8 +42,8 @@
 
 genrule {
     name: "android.hardware.audio.effect@2.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.audio.effect@2.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.audio.effect@2.0",
     srcs: [
         "types.hal",
         "IAcousticEchoCancelerEffect.hal",
diff --git a/benchmarks/msgq/1.0/Android.bp b/benchmarks/msgq/1.0/Android.bp
index 5fe6203..a527b32 100644
--- a/benchmarks/msgq/1.0/Android.bp
+++ b/benchmarks/msgq/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.benchmarks.msgq@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.benchmarks.msgq@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.benchmarks.msgq@1.0",
     srcs: [
         "IBenchmarkMsgQ.hal",
     ],
@@ -14,8 +14,8 @@
 
 genrule {
     name: "android.hardware.benchmarks.msgq@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.benchmarks.msgq@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.benchmarks.msgq@1.0",
     srcs: [
         "IBenchmarkMsgQ.hal",
     ],
diff --git a/biometrics/fingerprint/2.1/Android.bp b/biometrics/fingerprint/2.1/Android.bp
index 5ade9f3..9d2af44 100644
--- a/biometrics/fingerprint/2.1/Android.bp
+++ b/biometrics/fingerprint/2.1/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.biometrics.fingerprint@2.1_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.biometrics.fingerprint@2.1",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.biometrics.fingerprint@2.1",
     srcs: [
         "types.hal",
         "IBiometricsFingerprint.hal",
@@ -18,8 +18,8 @@
 
 genrule {
     name: "android.hardware.biometrics.fingerprint@2.1_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.biometrics.fingerprint@2.1",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.biometrics.fingerprint@2.1",
     srcs: [
         "types.hal",
         "IBiometricsFingerprint.hal",
diff --git a/bluetooth/1.0/Android.bp b/bluetooth/1.0/Android.bp
index ab0b1a9..d8f3ca5 100644
--- a/bluetooth/1.0/Android.bp
+++ b/bluetooth/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.bluetooth@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.bluetooth@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.bluetooth@1.0",
     srcs: [
         "types.hal",
         "IBluetoothHci.hal",
@@ -18,8 +18,8 @@
 
 genrule {
     name: "android.hardware.bluetooth@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.bluetooth@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.bluetooth@1.0",
     srcs: [
         "types.hal",
         "IBluetoothHci.hal",
diff --git a/boot/1.0/Android.bp b/boot/1.0/Android.bp
index 6c959d9..cad7497 100644
--- a/boot/1.0/Android.bp
+++ b/boot/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.boot@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.boot@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.boot@1.0",
     srcs: [
         "types.hal",
         "IBootControl.hal",
@@ -16,8 +16,8 @@
 
 genrule {
     name: "android.hardware.boot@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.boot@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.boot@1.0",
     srcs: [
         "types.hal",
         "IBootControl.hal",
diff --git a/broadcastradio/1.0/Android.bp b/broadcastradio/1.0/Android.bp
index 75736d1..c337e08 100644
--- a/broadcastradio/1.0/Android.bp
+++ b/broadcastradio/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.broadcastradio@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.broadcastradio@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.broadcastradio@1.0",
     srcs: [
         "types.hal",
         "IBroadcastRadio.hal",
@@ -22,8 +22,8 @@
 
 genrule {
     name: "android.hardware.broadcastradio@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.broadcastradio@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.broadcastradio@1.0",
     srcs: [
         "types.hal",
         "IBroadcastRadio.hal",
diff --git a/example/extension/light/2.0/Android.bp b/example/extension/light/2.0/Android.bp
index 5d58512..4cdbc66 100644
--- a/example/extension/light/2.0/Android.bp
+++ b/example/extension/light/2.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.example.extension.light@2.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.example.extension.light@2.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.example.extension.light@2.0",
     srcs: [
         "types.hal",
         "IExtLight.hal",
@@ -16,8 +16,8 @@
 
 genrule {
     name: "android.hardware.example.extension.light@2.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.example.extension.light@2.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.example.extension.light@2.0",
     srcs: [
         "types.hal",
         "IExtLight.hal",
diff --git a/gnss/1.0/Android.bp b/gnss/1.0/Android.bp
index 9b9abe3..1f538ca 100644
--- a/gnss/1.0/Android.bp
+++ b/gnss/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.gnss@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.gnss@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.gnss@1.0",
     srcs: [
         "types.hal",
         "IAGnss.hal",
@@ -48,8 +48,8 @@
 
 genrule {
     name: "android.hardware.gnss@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.gnss@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.gnss@1.0",
     srcs: [
         "types.hal",
         "IAGnss.hal",
diff --git a/graphics/allocator/2.0/Android.bp b/graphics/allocator/2.0/Android.bp
index 0d800be..004d7d2 100644
--- a/graphics/allocator/2.0/Android.bp
+++ b/graphics/allocator/2.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.graphics.allocator@2.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.graphics.allocator@2.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.graphics.allocator@2.0",
     srcs: [
         "types.hal",
         "IAllocator.hal",
@@ -16,8 +16,8 @@
 
 genrule {
     name: "android.hardware.graphics.allocator@2.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.graphics.allocator@2.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.graphics.allocator@2.0",
     srcs: [
         "types.hal",
         "IAllocator.hal",
diff --git a/graphics/common/1.0/Android.bp b/graphics/common/1.0/Android.bp
index ba66f94..fa95ca0 100644
--- a/graphics/common/1.0/Android.bp
+++ b/graphics/common/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.graphics.common@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.graphics.common@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.graphics.common@1.0",
     srcs: [
         "types.hal",
     ],
@@ -14,8 +14,8 @@
 
 genrule {
     name: "android.hardware.graphics.common@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.graphics.common@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.graphics.common@1.0",
     srcs: [
         "types.hal",
     ],
diff --git a/graphics/composer/2.1/Android.bp b/graphics/composer/2.1/Android.bp
index bc948e8..0015861 100644
--- a/graphics/composer/2.1/Android.bp
+++ b/graphics/composer/2.1/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.graphics.composer@2.1_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.graphics.composer@2.1",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.graphics.composer@2.1",
     srcs: [
         "types.hal",
         "IComposer.hal",
@@ -18,8 +18,8 @@
 
 genrule {
     name: "android.hardware.graphics.composer@2.1_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.graphics.composer@2.1",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.graphics.composer@2.1",
     srcs: [
         "types.hal",
         "IComposer.hal",
diff --git a/light/2.0/Android.bp b/light/2.0/Android.bp
index ff2414c..b762cc1 100644
--- a/light/2.0/Android.bp
+++ b/light/2.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.light@2.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.light@2.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.light@2.0",
     srcs: [
         "types.hal",
         "ILight.hal",
@@ -16,8 +16,8 @@
 
 genrule {
     name: "android.hardware.light@2.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.light@2.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.light@2.0",
     srcs: [
         "types.hal",
         "ILight.hal",
diff --git a/memtrack/1.0/Android.bp b/memtrack/1.0/Android.bp
index 4b6864c..83c09cf 100644
--- a/memtrack/1.0/Android.bp
+++ b/memtrack/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.memtrack@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.memtrack@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.memtrack@1.0",
     srcs: [
         "types.hal",
         "IMemtrack.hal",
@@ -16,8 +16,8 @@
 
 genrule {
     name: "android.hardware.memtrack@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.memtrack@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.memtrack@1.0",
     srcs: [
         "types.hal",
         "IMemtrack.hal",
diff --git a/nfc/1.0/Android.bp b/nfc/1.0/Android.bp
index 9c3bb5f..b6e8d08 100644
--- a/nfc/1.0/Android.bp
+++ b/nfc/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.nfc@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.nfc@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.nfc@1.0",
     srcs: [
         "types.hal",
         "INfc.hal",
@@ -18,8 +18,8 @@
 
 genrule {
     name: "android.hardware.nfc@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.nfc@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.nfc@1.0",
     srcs: [
         "types.hal",
         "INfc.hal",
diff --git a/power/1.0/Android.bp b/power/1.0/Android.bp
index 52ec33f..a671474 100644
--- a/power/1.0/Android.bp
+++ b/power/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.power@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.power@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.power@1.0",
     srcs: [
         "types.hal",
         "IPower.hal",
@@ -16,8 +16,8 @@
 
 genrule {
     name: "android.hardware.power@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.power@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.power@1.0",
     srcs: [
         "types.hal",
         "IPower.hal",
diff --git a/radio/1.0/Android.bp b/radio/1.0/Android.bp
index 5927549..0f89421 100644
--- a/radio/1.0/Android.bp
+++ b/radio/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.radio@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.radio@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.radio@1.0",
     srcs: [
         "types.hal",
         "IRadio.hal",
@@ -24,8 +24,8 @@
 
 genrule {
     name: "android.hardware.radio@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.radio@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.radio@1.0",
     srcs: [
         "types.hal",
         "IRadio.hal",
diff --git a/sensors/1.0/Android.bp b/sensors/1.0/Android.bp
index 13e9bee..2039613 100644
--- a/sensors/1.0/Android.bp
+++ b/sensors/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.sensors@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.sensors@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.sensors@1.0",
     srcs: [
         "types.hal",
         "ISensors.hal",
@@ -16,8 +16,8 @@
 
 genrule {
     name: "android.hardware.sensors@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.sensors@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.sensors@1.0",
     srcs: [
         "types.hal",
         "ISensors.hal",
diff --git a/soundtrigger/2.0/Android.bp b/soundtrigger/2.0/Android.bp
index cda8c22..d59e47f 100644
--- a/soundtrigger/2.0/Android.bp
+++ b/soundtrigger/2.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.soundtrigger@2.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.soundtrigger@2.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.soundtrigger@2.0",
     srcs: [
         "types.hal",
         "ISoundTriggerHw.hal",
@@ -18,8 +18,8 @@
 
 genrule {
     name: "android.hardware.soundtrigger@2.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.soundtrigger@2.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.soundtrigger@2.0",
     srcs: [
         "types.hal",
         "ISoundTriggerHw.hal",
diff --git a/tests/bar/1.0/Android.bp b/tests/bar/1.0/Android.bp
index 4af053c..a0b42b7 100644
--- a/tests/bar/1.0/Android.bp
+++ b/tests/bar/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.tests.bar@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.bar@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.bar@1.0",
     srcs: [
         "IBar.hal",
         "IImportTypes.hal",
@@ -16,8 +16,8 @@
 
 genrule {
     name: "android.hardware.tests.bar@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.bar@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.bar@1.0",
     srcs: [
         "IBar.hal",
         "IImportTypes.hal",
diff --git a/tests/baz/1.0/Android.bp b/tests/baz/1.0/Android.bp
index 18a554d..1a7c300 100644
--- a/tests/baz/1.0/Android.bp
+++ b/tests/baz/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.tests.baz@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.baz@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.baz@1.0",
     srcs: [
         "types.hal",
         "IBase.hal",
@@ -20,8 +20,8 @@
 
 genrule {
     name: "android.hardware.tests.baz@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.baz@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.baz@1.0",
     srcs: [
         "types.hal",
         "IBase.hal",
diff --git a/tests/expression/1.0/Android.bp b/tests/expression/1.0/Android.bp
index 2061283..6acb3f9 100644
--- a/tests/expression/1.0/Android.bp
+++ b/tests/expression/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.tests.expression@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.expression@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.expression@1.0",
     srcs: [
         "IExpression.hal",
         "IExpressionExt.hal",
@@ -16,8 +16,8 @@
 
 genrule {
     name: "android.hardware.tests.expression@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.expression@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.expression@1.0",
     srcs: [
         "IExpression.hal",
         "IExpressionExt.hal",
diff --git a/tests/foo/1.0/Android.bp b/tests/foo/1.0/Android.bp
index 7a556ed..7e30fe3 100644
--- a/tests/foo/1.0/Android.bp
+++ b/tests/foo/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.tests.foo@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.foo@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.foo@1.0",
     srcs: [
         "types.hal",
         "IFoo.hal",
@@ -24,8 +24,8 @@
 
 genrule {
     name: "android.hardware.tests.foo@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.foo@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.foo@1.0",
     srcs: [
         "types.hal",
         "IFoo.hal",
diff --git a/tests/inheritance/1.0/Android.bp b/tests/inheritance/1.0/Android.bp
index 92d6fe7..f522ac0 100644
--- a/tests/inheritance/1.0/Android.bp
+++ b/tests/inheritance/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.tests.inheritance@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.inheritance@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.inheritance@1.0",
     srcs: [
         "IChild.hal",
         "IFetcher.hal",
@@ -20,8 +20,8 @@
 
 genrule {
     name: "android.hardware.tests.inheritance@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.inheritance@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.inheritance@1.0",
     srcs: [
         "IChild.hal",
         "IFetcher.hal",
diff --git a/tests/libhwbinder/1.0/Android.bp b/tests/libhwbinder/1.0/Android.bp
index aad24a6..2598f30 100644
--- a/tests/libhwbinder/1.0/Android.bp
+++ b/tests/libhwbinder/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.tests.libhwbinder@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.libhwbinder@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.libhwbinder@1.0",
     srcs: [
         "IBenchmark.hal",
     ],
@@ -14,8 +14,8 @@
 
 genrule {
     name: "android.hardware.tests.libhwbinder@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.libhwbinder@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.libhwbinder@1.0",
     srcs: [
         "IBenchmark.hal",
     ],
diff --git a/tests/msgq/1.0/Android.bp b/tests/msgq/1.0/Android.bp
index 2eb36c0..e685bcc 100644
--- a/tests/msgq/1.0/Android.bp
+++ b/tests/msgq/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.tests.msgq@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.msgq@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.msgq@1.0",
     srcs: [
         "ITestMsgQ.hal",
     ],
@@ -14,8 +14,8 @@
 
 genrule {
     name: "android.hardware.tests.msgq@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.msgq@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.msgq@1.0",
     srcs: [
         "ITestMsgQ.hal",
     ],
diff --git a/tests/pointer/1.0/Android.bp b/tests/pointer/1.0/Android.bp
index 2b1e8b2..ad8d014 100644
--- a/tests/pointer/1.0/Android.bp
+++ b/tests/pointer/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.tests.pointer@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.pointer@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.pointer@1.0",
     srcs: [
         "IGraph.hal",
         "IPointer.hal",
@@ -16,8 +16,8 @@
 
 genrule {
     name: "android.hardware.tests.pointer@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.pointer@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tests.pointer@1.0",
     srcs: [
         "IGraph.hal",
         "IPointer.hal",
diff --git a/thermal/1.0/Android.bp b/thermal/1.0/Android.bp
index 76a38a0..60f2626 100644
--- a/thermal/1.0/Android.bp
+++ b/thermal/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.thermal@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.thermal@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.thermal@1.0",
     srcs: [
         "types.hal",
         "IThermal.hal",
@@ -16,8 +16,8 @@
 
 genrule {
     name: "android.hardware.thermal@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.thermal@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.thermal@1.0",
     srcs: [
         "types.hal",
         "IThermal.hal",
diff --git a/tv/cec/1.0/Android.bp b/tv/cec/1.0/Android.bp
index 4fd1b7e..bb1ae82 100644
--- a/tv/cec/1.0/Android.bp
+++ b/tv/cec/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.tv.cec@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tv.cec@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tv.cec@1.0",
     srcs: [
         "types.hal",
         "IHdmiCec.hal",
@@ -18,8 +18,8 @@
 
 genrule {
     name: "android.hardware.tv.cec@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tv.cec@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tv.cec@1.0",
     srcs: [
         "types.hal",
         "IHdmiCec.hal",
@@ -51,9 +51,9 @@
         "libutils",
         "libcutils",
     ],
-export_shared_lib_headers: [
-    "libhidl",
-    "libhwbinder",
-    "libutils",
+    export_shared_lib_headers: [
+        "libhidl",
+        "libhwbinder",
+        "libutils",
     ],
 }
diff --git a/tv/input/1.0/Android.bp b/tv/input/1.0/Android.bp
index fa736b0..0b63f31 100644
--- a/tv/input/1.0/Android.bp
+++ b/tv/input/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.tv.input@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tv.input@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tv.input@1.0",
     srcs: [
         "types.hal",
         "ITvInput.hal",
@@ -18,8 +18,8 @@
 
 genrule {
     name: "android.hardware.tv.input@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tv.input@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.tv.input@1.0",
     srcs: [
         "types.hal",
         "ITvInput.hal",
diff --git a/vehicle/2.0/Android.bp b/vehicle/2.0/Android.bp
index 27ac213..d51fe25 100644
--- a/vehicle/2.0/Android.bp
+++ b/vehicle/2.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.vehicle@2.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.vehicle@2.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.vehicle@2.0",
     srcs: [
         "types.hal",
         "IVehicle.hal",
@@ -18,8 +18,8 @@
 
 genrule {
     name: "android.hardware.vehicle@2.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.vehicle@2.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.vehicle@2.0",
     srcs: [
         "types.hal",
         "IVehicle.hal",
diff --git a/vibrator/1.0/Android.bp b/vibrator/1.0/Android.bp
index 85bbc5e..faf4341 100644
--- a/vibrator/1.0/Android.bp
+++ b/vibrator/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.vibrator@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.vibrator@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.vibrator@1.0",
     srcs: [
         "types.hal",
         "IVibrator.hal",
@@ -16,8 +16,8 @@
 
 genrule {
     name: "android.hardware.vibrator@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.vibrator@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.vibrator@1.0",
     srcs: [
         "types.hal",
         "IVibrator.hal",
diff --git a/vr/1.0/Android.bp b/vr/1.0/Android.bp
index eaed921..fc4619f 100644
--- a/vr/1.0/Android.bp
+++ b/vr/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.vr@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.vr@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.vr@1.0",
     srcs: [
         "IVr.hal",
     ],
@@ -14,8 +14,8 @@
 
 genrule {
     name: "android.hardware.vr@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.vr@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.vr@1.0",
     srcs: [
         "IVr.hal",
     ],
diff --git a/wifi/1.0/Android.bp b/wifi/1.0/Android.bp
index 7453fe7..b730931 100644
--- a/wifi/1.0/Android.bp
+++ b/wifi/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.wifi@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.wifi@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.wifi@1.0",
     srcs: [
         "types.hal",
         "IWifi.hal",
@@ -34,8 +34,8 @@
 
 genrule {
     name: "android.hardware.wifi@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.wifi@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.wifi@1.0",
     srcs: [
         "types.hal",
         "IWifi.hal",
diff --git a/wifi/supplicant/1.0/Android.bp b/wifi/supplicant/1.0/Android.bp
index d4247d2..08c6f9a 100644
--- a/wifi/supplicant/1.0/Android.bp
+++ b/wifi/supplicant/1.0/Android.bp
@@ -2,8 +2,8 @@
 
 genrule {
     name: "android.hardware.wifi.supplicant@1.0_genc++",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.wifi.supplicant@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.wifi.supplicant@1.0",
     srcs: [
         "types.hal",
         "ISupplicant.hal",
@@ -38,8 +38,8 @@
 
 genrule {
     name: "android.hardware.wifi.supplicant@1.0_genc++_headers",
-    tool: "hidl-gen",
-    cmd: "$tool -o $genDir -Lc++ -randroid.hardware:hardware/interfaces android.hardware.wifi.supplicant@1.0",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces android.hardware.wifi.supplicant@1.0",
     srcs: [
         "types.hal",
         "ISupplicant.hal",