[clang][cli] Parse HeaderSearch options separately

[jansvoboda11]

Summary

This patch moves parsing of header search options from parseSimpleArgs back to ParseHeaderSearchArgs where they originally were.

The round-trip algorithm in D94472 requires this separation to be able to run parsing and generating only for the options that need to be tested via round-tripping.

[dexonsmith]

LGTM.

clang/include/clang/Driver/Options.td

class FrontendOpts<string base>
   : KeyPathAndMacro<"FrontendOpts.", base> {}
 class PreprocessorOutputOpts<string base>
   : KeyPathAndMacro<"PreprocessorOutputOpts.", base> {}
 class DependencyOutputOpts<string base>
   : KeyPathAndMacro<"DependencyOutputOpts.", base> {}
 class CodeGenOpts<string base>
   : KeyPathAndMacro<"CodeGenOpts.", base, "CODEGEN_"> {}
 class HeaderSearchOpts<string base>
-  : KeyPathAndMacro<"HeaderSearchOpts->", base> {}
+  : KeyPathAndMacro<"HeaderSearchOpts->", base, "HEADER_SEARCH_"> {}
 class PreprocessorOpts<string base>
   : KeyPathAndMacro<"PreprocessorOpts->", base> {}
 class FileSystemOpts<string base>
   : KeyPathAndMacro<"FileSystemOpts.", base> {}
 class AnalyzerOpts<string base>
   : KeyPathAndMacro<"AnalyzerOpts->", base> {}
 class MigratorOpts<string base>
   : KeyPathAndMacro<"MigratorOpts.", base> {}

clang/lib/Frontend/CompilerInvocation.cpp

 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
                                                  void *MainAddr) {
   std::string ClangExecutable =
       llvm::sys::fs::getMainExecutable(Argv0, MainAddr);
   return Driver::GetResourcesPath(ClangExecutable, CLANG_RESOURCE_DIR);
 }
 
 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args,
+                                  DiagnosticsEngine &Diags,
                                   const std::string &WorkingDir) {
+  HeaderSearchOptions *HeaderSearchOpts = &Opts;
+  bool Success = true;
+
+#define HEADER_SEARCH_OPTION_WITH_MARSHALLING(                                 \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  PARSE_OPTION_WITH_MARSHALLING(Args, Diags, Success, ID, FLAGS, PARAM,        \
+                                SHOULD_PARSE, KEYPATH, DEFAULT_VALUE,          \
+                                IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER,      \
+                                MERGER, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef HEADER_SEARCH_OPTION_WITH_MARSHALLING
+
   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
 
   // Canonicalize -fmodules-cache-path before storing it.
   SmallString<128> P(Args.getLastArgValue(OPT_fmodules_cache_path));
   if (!(P.empty() || llvm::sys::path::is_absolute(P))) {
     if (WorkingDir.empty())
       llvm::sys::fs::make_absolute(P);
bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
   }
   Success &= ParseDiagnosticArgs(Res.getDiagnosticOpts(), Args, &Diags,
                                  /*DefaultDiagColor=*/false);
   // FIXME: We shouldn't have to pass the DashX option around here
   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), Args, Diags,
                                       LangOpts.IsHeaderFile);
   ParseTargetArgs(Res.getTargetOpts(), Args, Diags);
   llvm::Triple T(Res.getTargetOpts().Triple);
-  ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), Args,
+  ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), Args, Diags,
                         Res.getFileSystemOpts().WorkingDir);
   if (DashX.getFormat() == InputKind::Precompiled ||
       DashX.getLanguage() == Language::LLVM_IR) {
     // ObjCAAutoRefCount and Sanitize LangOpts are used to setup the
     // PassManager in BackendUtil.cpp. They need to be initializd no matter
     // what the input type is.
     if (Args.hasArg(OPT_fobjc_arc))
       LangOpts.ObjCAutoRefCount = 1;
#define OPTION_WITH_MARSHALLING(                                               \
     DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
     MERGER, EXTRACTOR, TABLE_INDEX)                                            \
   GENERATE_OPTION_WITH_MARSHALLING(Args, SA, KIND, FLAGS, SPELLING,            \
                                    ALWAYS_EMIT, this->KEYPATH, DEFAULT_VALUE,  \
                                    IMPLIED_CHECK, IMPLIED_VALUE, DENORMALIZER, \
                                    EXTRACTOR, TABLE_INDEX)
 
 #define DIAG_OPTION_WITH_MARSHALLING OPTION_WITH_MARSHALLING
+#define HEADER_SEARCH_OPTION_WITH_MARSHALLING OPTION_WITH_MARSHALLING
 #define LANG_OPTION_WITH_MARSHALLING OPTION_WITH_MARSHALLING
 #define CODEGEN_OPTION_WITH_MARSHALLING OPTION_WITH_MARSHALLING
 
 #include "clang/Driver/Options.inc"
 
 #undef CODEGEN_OPTION_WITH_MARSHALLING
 #undef LANG_OPTION_WITH_MARSHALLING
+#undef HEADER_SEARCH_OPTION_WITH_MARSHALLING
 #undef DIAG_OPTION_WITH_MARSHALLING
 #undef OPTION_WITH_MARSHALLING
 #undef GENERATE_OPTION_WITH_MARSHALLING
 
   GenerateLangArgs(*LangOpts, Args, SA);
 }
 
 IntrusiveRefCntPtr<llvm::vfs::FileSystem>