1 files changed, 22 insertions, 0 deletions
diff --git a/devel/wasi-libc/files/llvm21/__stdarg_va_arg.h b/devel/wasi-libc/files/llvm21/__stdarg_va_arg.h
new file mode 100644
index 000000000000..ebdb6f9d4b1e
--- /dev/null
+++ b/devel/wasi-libc/files/llvm21/__stdarg_va_arg.h
@@ -0,0 +1,22 @@
+/*===---- __stdarg_va_arg.h - Definitions of va_start, va_arg, va_end-------===
+ *
+ * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+ * See https://llvm.org/LICENSE.txt for license information.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ *
+ *===-----------------------------------------------------------------------===
+ */
+
+#ifndef va_arg
+
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L
+/* C23 uses a special builtin. */
+#define va_start(...) __builtin_c23_va_start(__VA_ARGS__)
+#else
+/* Versions before C23 do require the second parameter. */
+#define va_start(ap, param) __builtin_va_start(ap, param)
+#endif
+#define va_end(ap) __builtin_va_end(ap)
+#define va_arg(ap, type) __builtin_va_arg(ap, type)
+
+#endif