Add lldb-gdbserver support for Linux x86_64.

This change brings in lldb-gdbserver (llgs) specifically for Linux x86_64.
(More architectures coming soon).

Not every debugserver option is covered yet.  Currently
the lldb-gdbserver command line can start unattached,
start attached to a pid (process-name attach not supported yet),
or accept lldb attaching and launching a process or connecting
by process id.

The history of this large change can be found here:
https://github.com/tfiala/lldb/tree/dev-tfiala-native-protocol-linux-x86_64

Until mid/late April, I was not sharing the work and continued
to rebase it off of head (developed via id tfiala@google.com).  I switched over to
user todd.fiala@gmail.com in the middle, and once I went to github, I did
merges rather than rebasing so I could share with others.

llvm-svn: 212069

1 files changed, 5 insertions, 1 deletions

diff --git a/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp b/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp
index 457125aa0a9..5db30d99d30 100644
--- a/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp
+++ b/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp
@@ -1228,8 +1228,12 @@ ProcessMonitor::Launch(LaunchArgs *args)
 
     // Wait for the child process to to trap on its call to execve.
     lldb::pid_t wpid;
+    ::pid_t raw_pid;
     int status;
-    if ((wpid = waitpid(pid, &status, 0)) < 0)
+
+    raw_pid = waitpid(pid, &status, 0);
+    wpid = static_cast <lldb::pid_t> (raw_pid);
+    if (raw_pid < 0)
     {
         args->m_error.SetErrorToErrno();
         goto FINISH;