[llvm][TextAPI/MachO] Support writing single macCatalyst platform

[JDevlieghere]

Summary

TAPI currently lacks a way to emit the macCatalyst platform. For TBD_V3 is does support zippered frameworks given that both macOS and macCatalyst are part of the PlatformSet.

[merge_guards_bot]

Unit tests: fail. 62150 tests passed, 5 failed and 811 were skipped.

failed: libc++.std/language_support/cmp/cmp_partialord/partialord.pass.cpp
failed: libc++.std/language_support/cmp/cmp_strongeq/cmp.strongeq.pass.cpp
failed: libc++.std/language_support/cmp/cmp_strongord/strongord.pass.cpp
failed: libc++.std/language_support/cmp/cmp_weakeq/cmp.weakeq.pass.cpp
failed: libc++.std/language_support/cmp/cmp_weakord/weakord.pass.cpp

clang-tidy: pass.

clang-format: pass.

Build artifacts: diff.json, clang-tidy.txt, clang-format.patch, CMakeCache.txt, console-log.txt, test-results.xml

Pre-merge checks is in beta. Report issue. Please join beta or enable it for your project.

[cishida]

LGTM, thank you!

llvm/lib/TextAPI/MachO/TextStubCommon.cpp

case PlatformKind::watchOS:
     OS << "watchos";
     break;
   case PlatformKind::tvOS:
     OS << "tvos";
     break;
   case PlatformKind::bridgeOS:
     OS << "bridgeos";
     break;
+  case PlatformKind::macCatalyst:
+    OS << "iosmac";
+    break;
   }
 }
 
 StringRef ScalarTraits<PlatformSet>::input(StringRef Scalar, void *IO,
                                            PlatformSet &Values) {
   const auto *Ctx = reinterpret_cast<TextAPIContext *>(IO);
   assert((!Ctx || Ctx->FileKind != FileType::Invalid) &&
          "File type is not set in context");

llvm/unittests/TextAPI/TextStubV3Tests.cpp

TEST(TBDv3, Platform_macCatalyst) {
   auto Result =
       TextAPIReader::get(MemoryBufferRef(tbd_v3_platform_iosmac, "Test.tbd"));
   EXPECT_TRUE(!!Result);
   auto Platform = PlatformKind::macCatalyst;
   auto File = std::move(Result.get());
   EXPECT_EQ(FileType::TBD_V3, File->getFileType());
   EXPECT_EQ(Platform, *File->getPlatforms().begin());
 
-  // It's not currently possible to emit the iomac platform. Enable this once
-  // that's fixed.
-#if 0
   SmallString<4096> Buffer;
   raw_svector_ostream OS(Buffer);
   auto WriteResult = TextAPIWriter::writeToStream(OS, *File);
   EXPECT_TRUE(!WriteResult);
   EXPECT_EQ(stripWhitespace(tbd_v3_platform_iosmac), stripWhitespace(Buffer.c_str()));
-#endif
 }
 
 TEST(TBDv3, Platform_zippered) {
   static const char tbd_v3_platform_zip[] = "--- !tapi-tbd-v3\n"
                                                  "archs: [ armv7k ]\n"
                                                  "platform: zippered\n"
                                                  "install-name: Test.dylib\n"
                                                  "...\n";