Reland [clang] [unittest] Add a test for Generic_GCC::GCCVersion::Parse (#69078)

This adds actual test cases for all the cases that are listed in a code
comment in the implementation of this function; having such test
coverage eases doing further modifications to the function.

This relands b4b35a5d2b4ee26bf79b8a92715dd200f3f9cc49. This time,
the new test is excluded if building with dylibs or shared libraries
enabled, as the clang::toolchains::Generic_GCC class is marked
LLVM_LIBRARY_VISIBILITY, giving it hidden visibility in such builds,
making it unreferencable outside of the dylib/shared library.

2 files changed, 60 insertions, 0 deletions

diff --git a/clang/unittests/Driver/CMakeLists.txt b/clang/unittests/Driver/CMakeLists.txt
index e37c158..752037f 100644
--- a/clang/unittests/Driver/CMakeLists.txt
+++ b/clang/unittests/Driver/CMakeLists.txt
@@ -9,6 +9,7 @@ set(LLVM_LINK_COMPONENTS
 add_clang_unittest(ClangDriverTests
   DistroTest.cpp
   DXCModeTest.cpp
+  GCCVersionTest.cpp
   ToolChainTest.cpp
   ModuleCacheTest.cpp
   MultilibBuilderTest.cpp
diff --git a/clang/unittests/Driver/GCCVersionTest.cpp b/clang/unittests/Driver/GCCVersionTest.cpp
new file mode 100644
index 0000000..88c26df
--- /dev/null
+++ b/clang/unittests/Driver/GCCVersionTest.cpp
@@ -0,0 +1,59 @@
+//===- unittests/Driver/GCCVersionTest.cpp --- GCCVersion parser tests ----===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Unit tests for Generic_GCC::GCCVersion
+//
+//===----------------------------------------------------------------------===//
+
+#include "../../lib/Driver/ToolChains/Gnu.h"
+#include "gtest/gtest.h"
+
+// The Generic_GCC class is hidden in dylib/shared library builds, so
+// this test can only be built if neither of those configurations are
+// enabled.
+#if !defined(LLVM_BUILD_LLVM_DYLIB) && !defined(LLVM_BUILD_SHARED_LIBS)
+
+using namespace clang;
+using namespace clang::driver;
+
+namespace {
+
+struct VersionParseTest {
+  std::string Text;
+
+  int Major, Minor, Patch;
+  std::string MajorStr, MinorStr, PatchSuffix;
+};
+
+const VersionParseTest TestCases[] = {
+    {"5", 5, -1, -1, "5", "", ""},
+    {"4.4", 4, 4, -1, "4", "4", ""},
+    {"4.4-patched", 4, 4, -1, "4", "4", "-patched"},
+    {"4.4.0", 4, 4, 0, "4", "4", ""},
+    {"4.4.x", 4, 4, -1, "4", "4", ""},
+    {"4.4.2-rc4", 4, 4, 2, "4", "4", "-rc4"},
+    {"4.4.x-patched", 4, 4, -1, "4", "4", ""},
+    {"not-a-version", -1, -1, -1, "", "", ""},
+};
+
+TEST(GCCVersionTest, Parse) {
+  for (const auto &TC : TestCases) {
+    auto V = toolchains::Generic_GCC::GCCVersion::Parse(TC.Text);
+    EXPECT_EQ(V.Text, TC.Text);
+    EXPECT_EQ(V.Major, TC.Major);
+    EXPECT_EQ(V.Minor, TC.Minor);
+    EXPECT_EQ(V.Patch, TC.Patch);
+    EXPECT_EQ(V.MajorStr, TC.MajorStr);
+    EXPECT_EQ(V.MinorStr, TC.MinorStr);
+    EXPECT_EQ(V.PatchSuffix, TC.PatchSuffix);
+  }
+}
+
+} // end anonymous namespace
+
+#endif