Add multiprocess extension support by enabling multiprocess mode when
the peer requests it, and by replying that we actually support it in the
qSupported reply packet.

Signed-off-by: Luc Michel <luc.michel@greensocs.com>
---
 gdbstub.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gdbstub.c b/gdbstub.c
index 6a55bf2785..d249803c8e 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -1688,15 +1688,19 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf)
             put_packet(s, "OK");
             break;
         }
 #endif /* !CONFIG_USER_ONLY */
         if (is_query_packet(p, "Supported", ':')) {
+            if (strstr(p, "multiprocess+")) {
+                s->multiprocess = true;
+            }
             snprintf(buf, sizeof(buf), "PacketSize=%x", MAX_PACKET_LENGTH);
             cc = CPU_GET_CLASS(first_cpu);
             if (cc->gdb_core_xml_file != NULL) {
                 pstrcat(buf, sizeof(buf), ";qXfer:features:read+");
             }
+            pstrcat(buf, sizeof(buf), ";multiprocess+");
             put_packet(s, buf);
             break;
         }
         if (strncmp(p, "Xfer:features:read:", 19) == 0) {
             const char *xml;
-- 
2.18.0