LLDB: Only specify triple on target create when platform is given (#3137)

* Only specify triple on target create when platform is given

* Update pwndbg/dbg/lldb/repl/__init__.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Disconnect3d <dominik.b.czarnota@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

pwndbg/dbg/lldb/repl/__init__.py

@@ -891,6 +891,15 @@ def target_create(args: List[str], dbg: LLDB) -> None:
     if args.arch:
         dbg.debugger.SetDefaultArchitecture(args.arch)
 
+    if args.sysroot:
+        dbg.debugger.SetCurrentPlatformSDKRoot(args.sysroot)
+
+    # Create the target with the debugger.
+    error = lldb.SBError()
+    if args.platform:
+        dbg.debugger.SetCurrentPlatform(args.platform)
+
+        # Having the platform specified requires that we specify the triple.
         triple = _get_target_triple(dbg.debugger, args.filename)
         if not triple:
             print_error(f"could not detect triple for '{args.filename}'")
@@ -901,17 +910,12 @@ def target_create(args: List[str], dbg: LLDB) -> None:
             # Without setting it qemu-user don't work ;(
             dbg._execute_lldb_command(f"settings set platform.plugin.qemu-user.architecture {arch}")
 
-    if args.platform:
-        dbg.debugger.SetCurrentPlatform(args.platform)
-
-    if args.sysroot:
-        dbg.debugger.SetCurrentPlatformSDKRoot(args.sysroot)
-
-    # Create the target with the debugger.
-    error = lldb.SBError()
         target: lldb.SBTarget = dbg.debugger.CreateTarget(
             args.filename, triple, args.platform, True, error
         )
+    else:
+        # Let LLDB figure out both the triple and the platform automatically.
+        target = dbg.debugger.CreateTarget(args.filename, None, None, True, error)
     if not error.success or not target.IsValid():
         print_error(f"could not create target for '{args.filename}': {error.description}")
         return