macho: fix various linker flags

fix drivers: zig {cc,c++}
  - `-dynamiclib` is an alias to `-shared`
  - associate `-dynamiclib` with zig `.shared` semantics

fix drivers: zig {cc,c++,build-lib,build-exe}
  - use `-dynamic` for {exe,dylib}
  - for dylib this fixes a regression
  - for exe this replaces incorrect use of `-static`

src/clang_options_data.zig

@@ -2426,7 +2426,14 @@ flagpd1("dwarf-ext-refs"),
 sepd1("dylib_file"),
 flagpd1("dylinker"),
 flagpd1("dynamic"),
-flagpd1("dynamiclib"),
+.{
+    .name = "dynamiclib",
+    .syntax = .flag,
+    .zig_equivalent = .shared,
+    .pd1 = true,
+    .pd2 = false,
+    .psl = false,
+},
 flagpd1("emit-ast"),
 flagpd1("emit-codegen-only"),
 flagpd1("emit-header-module"),

src/link/MachO.zig

@@ -644,9 +644,7 @@ fn linkWithLLD(self: *MachO, comp: *Compilation) !void {
             try argv.append("defs");
         }
 
-        if (is_dyn_lib) {
-            try argv.append("-static");
-        } else {
+        if (is_exe_or_dyn_lib) {
             try argv.append("-dynamic");
         }
 

tools/update_clang_options.zig

@@ -332,6 +332,10 @@ const known_options = [_]KnownOpt{
         .name = "s",
         .ident = "strip",
     },
+    .{
+        .name = "dynamiclib",
+        .ident = "shared",
+    },
 };
 
 const blacklisted_options = [_][]const u8{};