From b96d5886684428eb64a0f186ab7496af8c18752a Mon Sep 17 00:00:00 2001
From: Daniel Bevenius <daniel.bevenius@gmail.com>
Date: Mon, 26 Jan 2026 15:24:32 +0100
Subject: [PATCH] common : add specific warning for multiple -m options

This commit updates the deprecation warning for multiple model options
with a specific message that does not mention comma-separated values as
an option.

The motivation for this is that currently it can be confusing if
multiple model options are specified with llama-server as this would
display the following warning:
```console
DEPRECATED: argument '--model' specified multiple times, use comma-separated values instead (only last value will be used)
```
But llama-server does not support a comma-separated models option.

With this change the user is informed that multiple models can be
supported in router mode if using llama-server:
```console
DEPRECATED: multiple --model options are not supported (only last value will be used). Use router mode for llama-server (see --help)
```
---
 common/arg.cpp | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/common/arg.cpp b/common/arg.cpp
index 04fd375d56..24ebd9a012 100644
--- a/common/arg.cpp
+++ b/common/arg.cpp
@@ -489,7 +489,12 @@ static bool common_params_parse_ex(int argc, char ** argv, common_params_context
                 throw std::invalid_argument(string_format("error: invalid argument: %s", arg.c_str()));
             }
             if (!seen_args.insert(arg).second) {
-                LOG_WRN("DEPRECATED: argument '%s' specified multiple times, use comma-separated values instead (only last value will be used)\n", arg.c_str());
+                if (arg == "-m" || arg == "--model") {
+                    LOG_WRN("DEPRECATED: multiple %s options are not supported (only last value will be used). "
+                            "Use router mode for llama-server (see --help)\n", arg.c_str());
+                } else {
+                    LOG_WRN("DEPRECATED: argument '%s' specified multiple times, use comma-separated values instead (only last value will be used)\n", arg.c_str());
+                }
             }
             auto & tmp = arg_to_options[arg];
             auto opt = *tmp.first;
@@ -848,7 +853,12 @@ bool common_params_to_map(int argc, char ** argv, llama_example ex, std::map<com
             throw std::invalid_argument(string_format("error: invalid argument: %s", arg.c_str()));
         }
         if (!seen_args.insert(arg).second) {
-            LOG_WRN("DEPRECATED: argument '%s' specified multiple times, use comma-separated values instead (only last value will be used)\n", arg.c_str());
+            if (arg == "-m" || arg == "--model") {
+                LOG_WRN("DEPRECATED: multiple %s options are not supported (only last value will be used). "
+                        "Use router mode for llama-server (see --help)\n", arg.c_str());
+            } else {
+                LOG_WRN("DEPRECATED: argument '%s' specified multiple times, use comma-separated values instead (only last value will be used)\n", arg.c_str());
+            }
         }
         auto opt = *arg_to_options[arg];
         std::string val;