message: Add -Wno-unknown-warning-option
diff: @@ -194,6 +194,11 @@ Project::Entry GetCompilationEntryFromCompileCommandEntry(
  if (!AnyStartsWith(result.args, "-resource-dir"))
  result.args.push_back("-resource-dir=" + config->resource_dir);
  + // There could be a clang version mismatch between what the project uses and
  + // what cquery uses. Make sure we do not emit warnings for mismatched options.
  + if (!AnyStartsWith(result.args, "-Wno-unknown-warning-option"))
  + result.args.push_back("-Wno-unknown-warning-option");
  +
  return result;
  }
  @@ -462,15 +467,18 @@ TEST_SUITE("Project") {
  CheckFlags(
  /* raw */ {"clang", "-lstdc++", "myfile.cc"},
  /* expected */ {"clang", "-lstdc++", "myfile.cc", "-xc++", "-std=c++11",
  - "-resource-dir=/w/resource_dir/"});
  + "-resource-dir=/w/resource_dir/",
  + "-Wno-unknown-warning-option"});
  CheckFlags(/* raw */ {"goma", "clang"},
  /* expected */ {"clang", "-xc++", "-std=c++11",
  - "-resource-dir=/w/resource_dir/"});
  + "-resource-dir=/w/resource_dir/",
  + "-Wno-unknown-warning-option"});
  CheckFlags(/* raw */ {"goma", "clang", "--foo"},
  /* expected */ {"clang", "--foo", "-xc++", "-std=c++11",
  - "-resource-dir=/w/resource_dir/"});
  + "-resource-dir=/w/resource_dir/",
  + "-Wno-unknown-warning-option"});
  }
  // FIXME: Fix this test.
  @@ -479,7 +487,8 @@ TEST_SUITE("Project") {
  "/home/user", "/home/user/foo/bar.c",
  /* raw */ {"cc", "-O0", "foo/bar.c"},
  /* expected */
  - {"cc", "-O0", "-xc", "-std=c11", "-resource-dir=/w/resource_dir/"});
  + {"cc", "-O0", "-xc", "-std=c11", "-resource-dir=/w/resource_dir/",
  + "-Wno-unknown-warning-option"});
  }
  // Checks flag parsing for a random chromium file in comparison to what
  @@ -824,7 +833,8 @@ TEST_SUITE("Project") {
  "-fno-exceptions",
  "-fvisibility-inlines-hidden",
  "-xc++",
  - "-resource-dir=/w/resource_dir/"});
  + "-resource-dir=/w/resource_dir/",
  + "-Wno-unknown-warning-option"});
  }
  // Checks flag parsing for an example chromium file.
  @@ -1143,7 +1153,8 @@ TEST_SUITE("Project") {
  "-fno-exceptions",
  "-fvisibility-inlines-hidden",
  "-xc++",
  - "-resource-dir=/w/resource_dir/"});
  + "-resource-dir=/w/resource_dir/",
  + "-Wno-unknown-warning-option"});
  }
  TEST_CASE("Directory extraction") {
  