提交 #1

build/config/coverage/BUILD.gn

@@ -0,0 +1,38 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/coverage/coverage.gni")
+
+config("default_coverage") {
+  if (use_clang_coverage) {
+    cflags = [
+      "--coverage",
+
+      # Following experimental flags removes unused header functions from the
+      # coverage mapping data embedded in the test binaries, and the reduction
+      # of binary size enables building Chrome's large unit test targets on
+      # MacOS. Please refer to crbug.com/796290 for more details.
+      "-mllvm",
+      "-limited-coverage-experimental=true",
+    ]
+
+    ldflags = []
+    if (!is_win) {
+      ldflags = [ "--coverage" ]
+      cflags += [ "-fno-use-cxa-atexit" ]
+    } else {
+      # Windows directly calls link.exe instead of the compiler driver when
+      # linking.  Hence, pass the runtime libraries instead of
+      # -fsanitize=address.
+      if (target_cpu == "x64") {
+        ldflags += [ "clang_rt.profile-x86_64.lib" ]
+      } else if (target_cpu == "x86") {
+        ldflags += [ "clang_rt.profile-i386.lib" ]
+      } else {
+        assert(false,
+               "use_clang_coverage=true not supported yet for this target_cpu")
+      }
+    }
+  }
+}

build/config/coverage/coverage.gni

@@ -0,0 +1,13 @@
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/toolchain/toolchain.gni")
+
+declare_args() {
+  # Enable Clang's Source-based Code Coverage.
+  use_clang_coverage = false
+}
+
+assert(!use_clang_coverage || is_clang,
+       "Clang Source-based Code Coverage requires clang.")