Remove mention of lldMachO from the project

including:
* finding lldMachO in CMake config
* punting `ld64.lld` to LLD linker
* providing bindings to LLD linker

Author: kubkon

cmake/Findlld.cmake

@@ -42,7 +42,6 @@ else()
     FIND_AND_ADD_LLD_LIB(lldMinGW)
     FIND_AND_ADD_LLD_LIB(lldELF)
     FIND_AND_ADD_LLD_LIB(lldCOFF)
-    FIND_AND_ADD_LLD_LIB(lldMachO)
     FIND_AND_ADD_LLD_LIB(lldWasm)
     FIND_AND_ADD_LLD_LIB(lldReaderWriter)
     FIND_AND_ADD_LLD_LIB(lldCore)

src/codegen/llvm/bindings.zig

@@ -496,12 +496,10 @@ fn LLVMInitializeAllAsmParsers() callconv(.C) void {
 
 extern fn ZigLLDLinkCOFF(argc: c_int, argv: [*:null]const ?[*:0]const u8, can_exit_early: bool) c_int;
 extern fn ZigLLDLinkELF(argc: c_int, argv: [*:null]const ?[*:0]const u8, can_exit_early: bool) c_int;
-extern fn ZigLLDLinkMachO(argc: c_int, argv: [*:null]const ?[*:0]const u8, can_exit_early: bool) c_int;
 extern fn ZigLLDLinkWasm(argc: c_int, argv: [*:null]const ?[*:0]const u8, can_exit_early: bool) c_int;
 
 pub const LinkCOFF = ZigLLDLinkCOFF;
 pub const LinkELF = ZigLLDLinkELF;
-pub const LinkMachO = ZigLLDLinkMachO;
 pub const LinkWasm = ZigLLDLinkWasm;
 
 pub const ObjectFormatType = enum(c_int) {

src/main.zig

@@ -226,7 +226,6 @@ pub fn mainArgs(gpa: *Allocator, arena: *Allocator, args: []const []const u8) !v
     {
         return punt_to_clang(arena, args);
     } else if (mem.eql(u8, cmd, "ld.lld") or
-        mem.eql(u8, cmd, "ld64.lld") or
         mem.eql(u8, cmd, "lld-link") or
         mem.eql(u8, cmd, "wasm-ld"))
     {
@@ -3384,7 +3383,6 @@ fn punt_to_llvm_ar(arena: *Allocator, args: []const []const u8) error{OutOfMemor
 
 /// The first argument determines which backend is invoked. The options are:
 /// * `ld.lld` - ELF
-/// * `ld64.lld` - Mach-O
 /// * `lld-link` - COFF
 /// * `wasm-ld` - WebAssembly
 /// TODO https://github.com/ziglang/zig/issues/3257
@@ -3402,8 +3400,6 @@ pub fn punt_to_lld(arena: *Allocator, args: []const []const u8) error{OutOfMemor
         const argc = @intCast(c_int, argv.len);
         if (mem.eql(u8, args[1], "ld.lld")) {
             break :rc llvm.LinkELF(argc, argv.ptr, true);
-        } else if (mem.eql(u8, args[1], "ld64.lld")) {
-            break :rc llvm.LinkMachO(argc, argv.ptr, true);
         } else if (mem.eql(u8, args[1], "lld-link")) {
             break :rc llvm.LinkCOFF(argc, argv.ptr, true);
         } else if (mem.eql(u8, args[1], "wasm-ld")) {

src/zig_llvm.cpp

@@ -1187,11 +1187,6 @@ int ZigLLDLinkELF(int argc, const char **argv, bool can_exit_early) {
     return lld::elf::link(args, can_exit_early, llvm::outs(), llvm::errs());
 }
 
-int ZigLLDLinkMachO(int argc, const char **argv, bool can_exit_early) {
-    std::vector<const char *> args(argv, argv + argc);
-    return lld::mach_o::link(args, can_exit_early, llvm::outs(), llvm::errs());
-}
-
 int ZigLLDLinkWasm(int argc, const char **argv, bool can_exit_early) {
     std::vector<const char *> args(argv, argv + argc);
     return lld::wasm::link(args, can_exit_early, llvm::outs(), llvm::errs());

src/zig_llvm.h

@@ -514,7 +514,6 @@ ZIG_EXTERN_C const char *ZigLLVMGetEnvironmentTypeName(enum ZigLLVM_EnvironmentT
 
 ZIG_EXTERN_C int ZigLLDLinkCOFF(int argc, const char **argv, bool can_exit_early);
 ZIG_EXTERN_C int ZigLLDLinkELF(int argc, const char **argv, bool can_exit_early);
-ZIG_EXTERN_C int ZigLLDLinkMachO(int argc, const char **argv, bool can_exit_early);
 ZIG_EXTERN_C int ZigLLDLinkWasm(int argc, const char **argv, bool can_exit_early);
 
 ZIG_EXTERN_C bool ZigLLVMWriteArchive(const char *archive_name, const char **file_names, size_t file_name_count,