From f1b948dcc5fa122a171e7824665dfe19ae36a92e Mon Sep 17 00:00:00 2001
From: Lee *!* Clagett <code@leeclagett.com>
Date: Mon, 12 Jan 2026 18:49:20 -0500
Subject: [PATCH] Tweak command_line::add_arg for clang 21

(cherry picked from commit 482daa7445f89acbe74f7a37023e4b89d17a97f0)
---
 src/common/command_line.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/common/command_line.h b/src/common/command_line.h
index d80a1b0df..fbd6549af 100644
--- a/src/common/command_line.h
+++ b/src/common/command_line.h
@@ -207,8 +207,7 @@ namespace command_line
     description.add_options()(arg.name, make_semantic(arg, def), arg.description);
   }
 
-  template<>
-  inline void add_arg(boost::program_options::options_description& description, const arg_descriptor<bool, false>& arg, bool unique)
+  inline void add_arg(boost::program_options::options_description& description, const arg_descriptor<bool, false>& arg, bool unique = true)
   {
     if (0 != description.find_nothrow(arg.name, false))
     {