[clang-format] Change GNU style language standard to LS_Latest (#104669)

Fixes #104655.

Author: owenca

clang/lib/Format/Format.cpp

@@ -1905,7 +1905,6 @@ FormatStyle getGNUStyle() {
   Style.Cpp11BracedListStyle = false;
   Style.FixNamespaceComments = false;
   Style.SpaceBeforeParens = FormatStyle::SBPO_Always;
-  Style.Standard = FormatStyle::LS_Cpp03;
   return Style;
 }
 

clang/unittests/Format/TokenAnnotatorTest.cpp

@@ -3360,6 +3360,15 @@ TEST_F(TokenAnnotatorTest, TypenameMacro) {
   EXPECT_TOKEN(Tokens[6], tok::l_brace, TT_Unknown);
 }
 
+TEST_F(TokenAnnotatorTest, GNULanguageStandard) {
+  auto Style = getGNUStyle();
+  EXPECT_EQ(Style.Standard, FormatStyle::LS_Latest);
+
+  auto Tokens = annotate("return 1 <=> 2;", Style);
+  ASSERT_EQ(Tokens.size(), 6u);
+  EXPECT_TOKEN(Tokens[2], tok::spaceship, TT_BinaryOperator);
+}
+
 } // namespace
 } // namespace format
 } // namespace clang