Fix parameter pack expansion in process_start() for Clang

1 files changed, 7 insertions, 2 deletions

diff --git a/butl/process-run.txx b/butl/process-run.txx
index 4437488..9de601f 100644
--- a/butl/process-run.txx
+++ b/butl/process-run.txx
@@ -58,9 +58,14 @@ namespace butl
     small_vector<const char*, args_size + 2> cmd;
     cmd.push_back (pp.recall_string ());
 
+    auto call = [&cmd] (const auto& x, std::string& s) -> const char*
+    {
+      process_args_as (cmd, x, s);
+      return nullptr;
+    };
+
     std::string storage[args_size != 0 ? args_size : 1];
-    const char* dummy[] = {
-      nullptr, (process_args_as (cmd, args, storage[index]), nullptr)... };
+    const char* dummy[] = {nullptr, call (args, storage[index])... };
 
     cmd.push_back (dummy[0]); // NULL (and get rid of unused warning).