[clang] [clang-tools-extra] [clang-tidy] Add readability-avoid-default-lambda-capture (PR #160150)

[Baranov Victor via cfe-commits]

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@@ -0,0 +1,143 @@
+// RUN: %check_clang_tidy %s readability-avoid-default-lambda-capture %t -- -- -Wno-vla-extension
+
+void test_default_captures() {
+  int value = 42;
+  int another = 10;
+
+  auto lambda1 = [=](int x) { return value + x; };
+  // CHECK-MESSAGES: :[[@LINE-1]]:19: warning: lambda default captures are discouraged; prefer to capture specific variables explicitly [readability-avoid-default-lambda-capture]
+  // CHECK-FIXES: auto lambda1 = [value](int x) { return value + x; };
+
+  auto lambda2 = [&](int x) { return value + x; };
+  // CHECK-MESSAGES: :[[@LINE-1]]:19: warning: lambda default captures are discouraged; prefer to capture specific variables explicitly [readability-avoid-default-lambda-capture]
+  // CHECK-FIXES: auto lambda2 = [&value](int x) { return value + x; };
+
+  auto lambda3 = [=, &another](int x) { return value + another + x; };
+  // CHECK-MESSAGES: :[[@LINE-1]]:19: warning: lambda default captures are discouraged; prefer to capture specific variables explicitly [readability-avoid-default-lambda-capture]
+  // CHECK-FIXES: auto lambda3 = [value, &another](int x) { return value + another + x; };
+
+  auto lambda4 = [&, value](int x) { return value + another + x; };
+  // CHECK-MESSAGES: :[[@LINE-1]]:19: warning: lambda default captures are discouraged; prefer to capture specific variables explicitly [readability-avoid-default-lambda-capture]
+  // CHECK-FIXES: auto lambda4 = [&another, value](int x) { return value + another + x; };
+}
+
+void test_acceptable_captures() {
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vbvictor wrote:

Sure, I don't mind leaving it without a fix

https://github.com/llvm/llvm-project/pull/160150