Allow to fully disable LTO

--- ld64-236.3/src/ld/InputFiles.cpp
+++ ld64-236.3/src/ld/InputFiles.cpp
@@ -59,7 +59,9 @@
 #include "macho_relocatable_file.h"
 #include "macho_dylib_file.h"
 #include "archive_file.h"
+#ifdef LTO
 #include "lto_file.h"
+#endif
 #include "opaque_section_file.h"
 #include "MachOFileAbstraction.hpp"
 #include "Snapshot.h"
@@ -187,9 +189,11 @@
     if ( result != NULL  )
 		return result;
 
+#ifdef LTO
 	result = lto::archName(p, len);
 	if ( result != NULL  )
 		 return result;
+#endif
 	
 	if ( strncmp((const char*)p, "!<arch>\n", 8) == 0 )
 		return "archive";
@@ -292,6 +296,7 @@
 		return objResult;
 	}
 
+#ifdef LTO
 	// see if it is an llvm object file
 	objResult = lto::parse(p, len, info.path, info.modTime, info.ordinal, _options.architecture(), _options.subArchitecture(), _options.logAllFiles(), _options.verboseOptimizationHints());
 	if ( objResult != NULL ) {
@@ -299,6 +304,7 @@
 		OSAtomicIncrement32(&_totalObjectLoaded);
 		return objResult;
 	}
+#endif
 	
 	// see if it is a dynamic library
 	ld::dylib::File* dylibResult = mach_o::dylib::parse(p, len, info.path, info.modTime, _options, info.ordinal, info.options.fBundleLoader, indirectDylib);
@@ -322,6 +328,7 @@
 		return archiveResult;
 	}
 	
+#ifdef LTO
 	// does not seem to be any valid linker input file, check LTO misconfiguration problems
 	if ( lto::archName((uint8_t*)p, len) != NULL ) {
 		if ( lto::libLTOisLoaded() ) {
@@ -349,6 +356,7 @@
 			throwf("could not process llvm bitcode object file, because %s could not be loaded", libLTO);
 		}
 	}
+#endif
 
 	// error handling
 	if ( ((fat_header*)p)->magic == OSSwapBigToHostInt32(FAT_MAGIC) ) {
--- ld64-236.3/src/ld/ld.cpp
+++ ld64-236.3/src/ld/ld.cpp
@@ -91,7 +91,9 @@
 #include "parsers/archive_file.h"
 #include "parsers/macho_relocatable_file.h"
 #include "parsers/macho_dylib_file.h"
+#ifdef LTO
 #include "parsers/lto_file.h"
+#endif
 #include "parsers/opaque_section_file.h"
 
 
--- ld64-236.3/src/ld/Options.cpp
+++ ld64-236.3/src/ld/Options.cpp
@@ -41,10 +41,13 @@
 #include "MachOFileAbstraction.hpp"
 #include "Snapshot.h"
 
+
+#ifdef LTO
 // upward dependency on lto::version()
 namespace lto {
 	extern const char* version();
 }
+#endif
 
 // magic to place command line in crash reports
 const int crashreporterBufferSize = 2000;
@@ -3179,9 +3182,11 @@
 			fprintf(stderr, "configured to support archs: %s\n", ALL_SUPPORTED_ARCHS);
 			 // if only -v specified, exit cleanly
 			 if ( argc == 2 ) {
+#ifdef LTO
 				const char* ltoVers = lto::version();
 				if ( ltoVers != NULL )
 					fprintf(stderr, "LTO support using: %s\n", ltoVers);
+#endif
 				exit(0);
 			}
 		}
--- ld64-236.3/src/ld/parsers/archive_file.cpp
+++ ld64-236.3/src/ld/parsers/archive_file.cpp
@@ -45,7 +45,9 @@
 #include "Architectures.hpp"
 
 #include "macho_relocatable_file.h"
+#ifdef LTO
 #include "lto_file.h"
+#endif
 #include "archive_file.h"
 
 
@@ -97,8 +99,10 @@
 private:
 	static bool										validMachOFile(const uint8_t* fileContent, uint64_t fileLength, 
 																	const mach_o::relocatable::ParserOptions& opts);
+#ifdef LTO
 	static bool										validLTOFile(const uint8_t* fileContent, uint64_t fileLength, 
 																	const mach_o::relocatable::ParserOptions& opts);
+#endif
 	static cpu_type_t								architecture();
 
 	class Entry : ar_hdr
@@ -242,11 +246,13 @@
 	return mach_o::relocatable::isObjectFile(fileContent, fileLength, opts);
 }
 
+#ifdef LTO
 template <typename A>
 bool File<A>::validLTOFile(const uint8_t* fileContent, uint64_t fileLength, const mach_o::relocatable::ParserOptions& opts)
 {
 	return lto::isObjectFile(fileContent, fileLength, opts.architecture, opts.subType);
 }
+#endif
 
 
 
@@ -267,7 +273,11 @@
 		if ( (p==start) && ((strcmp(memberName, SYMDEF_SORTED) == 0) || (strcmp(memberName, SYMDEF) == 0)) )
 			continue;
 		// archive is valid if first .o file is valid
-		return (validMachOFile(p->content(), p->contentSize(), opts) || validLTOFile(p->content(), p->contentSize(), opts));
+		return (validMachOFile(p->content(), p->contentSize(), opts)
+#ifdef LTO
+            || validLTOFile(p->content(), p->contentSize(), opts)
+#endif
+            );
 	}	
 	// empty archive
 	return true;
@@ -388,6 +398,7 @@
 			_instantiatedEntries[member] = state;
 			return _instantiatedEntries[member];
 		}
+#ifdef LTO
 		// see if member is llvm bitcode file
 		result = lto::parse(member->content(), member->contentSize(), 
 								mPath, member->modificationTime(), ordinal, 
@@ -397,6 +408,7 @@
 			_instantiatedEntries[member] = state;
 			return _instantiatedEntries[member];
 		}
+#endif
 			
 		throwf("archive member '%s' with length %d is not mach-o or llvm bitcode", memberName, member->contentSize());
 	}
--- ld64-236.3/src/ld/Resolver.cpp
+++ ld64-236.3/src/ld/Resolver.cpp
@@ -56,7 +56,9 @@
 #include "InputFiles.h"
 #include "SymbolTable.h"
 #include "Resolver.h"
+#ifdef LTO
 #include "parsers/lto_file.h"
+#endif
 
 
 namespace ld {
@@ -1438,6 +1440,7 @@
 
 void Resolver::linkTimeOptimize()
 {
+#ifdef LTO
 	// only do work here if some llvm obj files where loaded
 	if ( ! _haveLLVMObjs )
 		return;
@@ -1535,6 +1538,9 @@
 		// check new code does not override some dylib
 		this->checkDylibSymbolCollisions();
 	}
+#else
+  return;
+#endif
 }
 
 
--- ld64-236.3/src/other/ObjectDump.cpp
+++ ld64-236.3/src/other/ObjectDump.cpp
@@ -33,7 +33,9 @@
 
 #include "MachOFileAbstraction.hpp"
 #include "parsers/macho_relocatable_file.h"
+#ifdef LTO
 #include "parsers/lto_file.h"
+#endif
 
 static bool			sDumpContent= true;
 static bool			sDumpStabs	= false;
@@ -1249,10 +1251,12 @@
 	if ( objResult != NULL )
 		return objResult;
 
+#ifdef LTO
 	// see if it is an llvm object file
 	objResult = lto::parse(p, fileLen, path, stat_buf.st_mtime, ld::File::Ordinal::NullOrdinal(), sPreferredArch, sPreferredSubArch, false, true);
 	if ( objResult != NULL ) 
 		return objResult;
+#endif
 
 	throwf("not a mach-o object file: %s", path);
 #else