Only run clang-tidy in presubmit when C, C++, ObjC, or ObjC++ files change (flutter/engine#36887)

engine/src/flutter/.ci.yaml

@@ -194,6 +194,17 @@ targets:
       lint_android: "false"
       lint_host: "true"
     timeout: 60
+    runIf:
+      - DEPS
+      - .ci.yaml
+      - tools/**
+      - ci/**
+      - "**.h"
+      - "**.c"
+      - "**.cc"
+      - "**.fbs"
+      - "**.frag"
+      - "**.vert"
 
   - name: Linux Android clang-tidy
     recipe: engine/engine_lint
@@ -203,6 +214,18 @@ targets:
       lint_android: "true"
       lint_host: "false"
     timeout: 60
+    runIf:
+      - DEPS
+      - .ci.yaml
+      - tools/**
+      - ci/**
+      - "**.h"
+      - "**.c"
+      - "**.cc"
+      - "**.fbs"
+      - "**.frag"
+      - "**.vert"
+      - "**.py" # Run pylint on the fastest clang-tidy builder.
 
   - name: Linux Arm Host Engine
     recipe: engine/engine_arm
@@ -336,6 +359,19 @@ targets:
       lint_host: "true"
       lint_ios: "false"
     timeout: 75
+    runIf:
+      - DEPS
+      - .ci.yaml
+      - tools/**
+      - ci/**
+      - "**.h"
+      - "**.c"
+      - "**.cc"
+      - "**.fbs"
+      - "**.frag"
+      - "**.vert"
+      - "**.m"
+      - "**.mm"
 
   - name: Mac iOS clang-tidy
     recipe: engine/engine_lint
@@ -345,6 +381,19 @@ targets:
       lint_host: "false"
       lint_ios: "true"
     timeout: 75
+    runIf:
+      - DEPS
+      - .ci.yaml
+      - tools/**
+      - ci/**
+      - "**.h"
+      - "**.c"
+      - "**.cc"
+      - "**.fbs"
+      - "**.frag"
+      - "**.vert"
+      - "**.m"
+      - "**.mm"
 
   - name: Mac iOS Engine
     recipe: engine/engine

engine/src/flutter/ci/lint.sh

@@ -41,6 +41,8 @@ if [ ! -f "$COMPILE_COMMANDS" ]; then
   (cd "$SRC_DIR"; ./flutter/tools/gn)
 fi
 
+echo "$(date +%T) Running clang_tidy"
+
 cd "$SCRIPT_DIR"
 "$DART" \
   --disable-dart-dev \
@@ -49,9 +51,13 @@ cd "$SCRIPT_DIR"
   --mac-host-warnings-as-errors="$MAC_HOST_WARNINGS_AS_ERRORS" \
   "$@"
 
+echo "$(date +%T) Running pylint"
+
 cd "$FLUTTER_DIR"
 pylint-2.7 --rcfile=.pylintrc \
   "build/" \
   "ci/" \
   "impeller/" \
   "tools/gn"
+
+echo "$(date +%T) Linting complete"