c-ares: add c-ares submodule

c-ares is a C library for asynchronous DNS requests, seastar requires
c-ares 1.13.0 or up. but xenial and EPEL offer 1.10.0, so we need to
build and ship it as part of Ceph.

Signed-off-by: Kefu Chai <kchai@redhat.com>

diff --git a/.gitmodules b/.gitmodules
index c8cd4d433a55bf5d689aec85598f8294a920a2a2..4913e29f159888428871cb2597681ba0b66db98d 100644 (file)
--- a/.gitmodules
+++ b/.gitmodules
@@ -58,3 +58,6 @@
 [submodule "src/fmt"]
        path = src/fmt
        url = https://github.com/ceph/fmt.git
+[submodule "src/c-ares"]
+       path = src/c-ares
+       url = https://github.com/ceph/c-ares.git

diff --git a/src/c-ares b/src/c-ares
new file mode 160000 (submodule)
index 0000000..fd6124c
--- /dev/null
+++ b/src/c-ares
@@ -0,0 +1 @@
+Subproject commit fd6124c74da0801f23f9d324559d8b66fb83f533