Import LLVM 10.0.0 release including clang, lld and lldb.

ok hackroom
tested by plenty

1 files changed, 30 insertions, 0 deletions

diff --git a/gnu/llvm/lldb/source/Host/linux/LibcGlue.cpp b/gnu/llvm/lldb/source/Host/linux/LibcGlue.cpp
new file mode 100644
index 00000000000..0acc2064c82
--- /dev/null
+++ b/gnu/llvm/lldb/source/Host/linux/LibcGlue.cpp
@@ -0,0 +1,30 @@
+//===-- LibcGlue.cpp --------------------------------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// This file adds functions missing from libc on older versions of linux
+
+#include <cerrno>
+#include <lldb/Host/linux/Uio.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+#if !HAVE_PROCESS_VM_READV
+// If the syscall wrapper is not available, provide one.
+ssize_t process_vm_readv(::pid_t pid, const struct iovec *local_iov,
+                         unsigned long liovcnt, const struct iovec *remote_iov,
+                         unsigned long riovcnt, unsigned long flags) {
+#if HAVE_NR_PROCESS_VM_READV
+  // If we have the syscall number, we can issue the syscall ourselves.
+  return syscall(__NR_process_vm_readv, pid, local_iov, liovcnt, remote_iov,
+                 riovcnt, flags);
+#else // If not, let's pretend the syscall is not present.
+  errno = ENOSYS;
+  return -1;
+#endif
+}
+#endif