[PATCH 12/16] lib: Make stdarg work for GCC on RV64.

[W. J. van der Laan]

* include/stdarg.h: GCC on RISC-V always passes arguments in registers.
Implementing these macros without the use of built-ins would be very
involved. So use those for now to make printf etc work.
---
 include/stdarg.h | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/include/stdarg.h b/include/stdarg.h
index 
6a8fee6ad2471c4f46102d9a07bc9359c6155f67..5e376fb5cde01b1b85cd16162f936935d27aea91
 100644
--- a/include/stdarg.h
+++ b/include/stdarg.h
@@ -26,7 +26,19 @@

 #define va_arg8(ap, type) va_arg(ap, type)

-#else // ! SYSTEM_LIBC
+#elif __GNUC__ && __riscv
+
+// GCC on RISC-V always passes arguments in registers. Implementing these 
macros without
+// the use of built-ins would be very involved.
+typedef __builtin_va_list va_list;
+
+#define va_start(v,l)   __builtin_va_start(v,l)
+#define va_end(v)       __builtin_va_end(v)
+#define va_arg(v,l)     __builtin_va_arg(v,l)
+#define va_arg8(ap, type) va_arg(ap, type)
+#define va_copy(d,s)    __builtin_va_copy(d,s)
+
+#else // ! SYSTEM_LIBC && ! __riscv

 #include <sys/types.h>

--
2.27.0