Rich Felker 8eb49e0485 fix riscv64 syscall asm constraint
having "+r"(a0) is redundant with "0"(a0) in syscalls with at least 1
arg, which is arguably a constraint violation (clang treats it as
such), and an invalid input with indeterminate value in the 0-arg
case. use the "=r"(a0) form instead.
2019-07-17 18:50:15 -04:00
..