Quick experiment trying out suggestion by @henryiii

rwgk · rwgk · commit dcb51394ed86 · 2021-07-31T23:14:21.000-07:00
diff --git a/include/pybind11/attr.h b/include/pybind11/attr.h
@@ -529,8 +529,9 @@ template <typename... Args> struct process_attributes {
     }
     static void precall(function_call &call) {
         PYBIND11_WORKAROUND_INCORRECT_MSVC_C4100(call);
-        int unused[] = { 0, (process_attribute<typename std::decay<Args>::type>::precall(call), 0) ... };
-        silence_unused_warnings(unused);
+        // int unused[] = { 0, (process_attribute<typename std::decay<Args>::type>::precall(call), 0) ... };
+        // silence_unused_warnings(unused);
+        (int []) { 0, (process_attribute<typename std::decay<Args>::type>::precall(call), 0) ... };
     }
     static void postcall(function_call &call, handle fn_ret) {
         PYBIND11_WORKAROUND_INCORRECT_MSVC_C4100(call, fn_ret);

Original file line number	Diff line number	Diff line change
`@@ -529,8 +529,9 @@ template <typename... Args> struct process_attributes {`
`529`	`529`	`}`
`530`	`530`	`static void precall(function_call &call) {`
`531`	`531`	`PYBIND11_WORKAROUND_INCORRECT_MSVC_C4100(call);`
`532`		`- int unused[] = { 0, (process_attribute<typename std::decay<Args>::type>::precall(call), 0) ... };`
`533`		`- silence_unused_warnings(unused);`
	`532`	`+ // int unused[] = { 0, (process_attribute<typename std::decay<Args>::type>::precall(call), 0) ... };`
	`533`	`+ // silence_unused_warnings(unused);`
	`534`	`+ (int []) { 0, (process_attribute<typename std::decay<Args>::type>::precall(call), 0) ... };`
`534`	`535`	`}`
`535`	`536`	`static void postcall(function_call &call, handle fn_ret) {`
`536`	`537`	`PYBIND11_WORKAROUND_INCORRECT_MSVC_C4100(call, fn_ret);`