Merge f05e32df4a into 3f593c62ae

GCC doesn't accept a path as an argument to `-fuse-ld`. `-fuse-ld=mold` is enough.

Tested with
```
gcc (GCC) 13.2.1 20231205 (Red Hat 13.2.1-6)
```

README.md

@@ -133,7 +133,7 @@ may be able to remove the `linker = "clang"` line.
 
 ```toml
 [target.x86_64-unknown-linux-gnu]
-rustflags = ["-C", "link-arg=-fuse-ld=/path/to/mold"]
+rustflags = ["-C", "link-arg=-fuse-ld=mold"]
 ```
 
 If you want to use mold for all projects, add the above snippet to

lib/filetype.h

@@ -10,14 +10,8 @@ enum class FileType {
   EMPTY,
   ELF_OBJ,
   ELF_DSO,
-  MACH_OBJ,
-  MACH_EXE,
-  MACH_DYLIB,
-  MACH_BUNDLE,
-  MACH_UNIVERSAL,
   AR,
   THIN_AR,
-  TAPI,
   TEXT,
   GCC_LTO_OBJ,
   LLVM_BITCODE,
@@ -133,28 +127,10 @@ FileType get_file_type(Context &ctx, MappedFile *mf) {
     return FileType::UNKNOWN;
   }
 
-  if (data.starts_with("\xcf\xfa\xed\xfe")) {
-    switch (*(ul32 *)(data.data() + 12)) {
-    case 1: // MH_OBJECT
-      return FileType::MACH_OBJ;
-    case 2: // MH_EXECUTE
-      return FileType::MACH_EXE;
-    case 6: // MH_DYLIB
-      return FileType::MACH_DYLIB;
-    case 8: // MH_BUNDLE
-      return FileType::MACH_BUNDLE;
-    }
-    return FileType::UNKNOWN;
-  }
-
   if (data.starts_with("!<arch>\n"))
     return FileType::AR;
   if (data.starts_with("!<thin>\n"))
     return FileType::THIN_AR;
-  if (data.starts_with("--- !tapi-tbd"))
-    return FileType::TAPI;
-  if (data.starts_with("\xca\xfe\xba\xbe"))
-    return FileType::MACH_UNIVERSAL;
   if (is_text_file(mf))
     return FileType::TEXT;
   if (data.starts_with("\xde\xc0\x17\x0b"))
@@ -170,14 +146,8 @@ inline std::string filetype_to_string(FileType type) {
   case FileType::EMPTY: return "EMPTY";
   case FileType::ELF_OBJ: return "ELF_OBJ";
   case FileType::ELF_DSO: return "ELF_DSO";
-  case FileType::MACH_EXE: return "MACH_EXE";
-  case FileType::MACH_OBJ: return "MACH_OBJ";
-  case FileType::MACH_DYLIB: return "MACH_DYLIB";
-  case FileType::MACH_BUNDLE: return "MACH_BUNDLE";
-  case FileType::MACH_UNIVERSAL: return "MACH_UNIVERSAL";
   case FileType::AR: return "AR";
   case FileType::THIN_AR: return "THIN_AR";
-  case FileType::TAPI: return "TAPI";
   case FileType::TEXT: return "TEXT";
   case FileType::GCC_LTO_OBJ: return "GCC_LTO_OBJ";
   case FileType::LLVM_BITCODE: return "LLVM_BITCODE";