Update Bazel WORKSPACE file and third_party/cares BUILD files to that Bazel can build gRPC as a dependency.

The WORKSPACE file now pulls third_party dependencies directly instead of requiring a git submodule init and update.
The git hashes pulled by Bazel are exactly the same as the git submodules checked into third_party.

A tiny bit of complexity comes from the c-ares project's use of ares_config.h.cmake and ares_build.c.cmake.
The current solution to this problem is to check in a valid ares_config.h and a few valid ares_config.h files.
This is the same general approach used still, but ares_config.h and ares_build.h are supplied to cares.BUILD
from the only remaining local_repository, which serves only to export these two header files.

2 files changed, 130 insertions, 85 deletions

diff --git a/third_party/cares/cares.BUILD b/third_party/cares/cares.BUILD
index 978e9b1ed9..87dcba4063 100644
--- a/third_party/cares/cares.BUILD
+++ b/third_party/cares/cares.BUILD
@@ -3,97 +3,112 @@ config_setting(
     values = {"cpu": "darwin"},
 )
 
+genrule(
+    name = "ares_build",
+    srcs = ["@cares_local_files//:ares_build_h"],
+    outs = ["ares_build.h"],
+    cmd = "cat $(location @cares_local_files//:ares_build_h) > $@",
+)
+
+cc_library(
+    name = "ares_build_h",
+    hdrs = ["ares_build.h"],
+    data = [":ares_build"],
+    includes = ["."],
+)
+
+genrule(
+    name = "ares_config",
+    srcs = ["@cares_local_files//:ares_config_h"],
+    outs = ["ares_config.h"],
+    cmd = "cat $(location @cares_local_files//:ares_config_h) > $@",
+)
+
+cc_library(
+    name = "ares_config_h",
+    hdrs = ["ares_config.h"],
+    data = [":ares_config"],
+    includes = ["."],
+)
+
 cc_library(
     name = "ares",
     srcs = [
-        "cares/ares__close_sockets.c",
-        "cares/ares__get_hostent.c",
-        "cares/ares__read_line.c",
-        "cares/ares__timeval.c",
-        "cares/ares_cancel.c",
-        "cares/ares_create_query.c",
-        "cares/ares_data.c",
-        "cares/ares_destroy.c",
-        "cares/ares_expand_name.c",
-        "cares/ares_expand_string.c",
-        "cares/ares_fds.c",
-        "cares/ares_free_hostent.c",
-        "cares/ares_free_string.c",
-        "cares/ares_getenv.c",
-        "cares/ares_gethostbyaddr.c",
-        "cares/ares_gethostbyname.c",
-        "cares/ares_getnameinfo.c",
-        "cares/ares_getopt.c",
-        "cares/ares_getsock.c",
-        "cares/ares_init.c",
-        "cares/ares_library_init.c",
-        "cares/ares_llist.c",
-        "cares/ares_mkquery.c",
-        "cares/ares_nowarn.c",
-        "cares/ares_options.c",
-        "cares/ares_parse_a_reply.c",
-        "cares/ares_parse_aaaa_reply.c",
-        "cares/ares_parse_mx_reply.c",
-        "cares/ares_parse_naptr_reply.c",
-        "cares/ares_parse_ns_reply.c",
-        "cares/ares_parse_ptr_reply.c",
-        "cares/ares_parse_soa_reply.c",
-        "cares/ares_parse_srv_reply.c",
-        "cares/ares_parse_txt_reply.c",
-        "cares/ares_platform.c",
-        "cares/ares_process.c",
-        "cares/ares_query.c",
-        "cares/ares_search.c",
-        "cares/ares_send.c",
-        "cares/ares_strcasecmp.c",
-        "cares/ares_strdup.c",
-        "cares/ares_strerror.c",
-        "cares/ares_timeout.c",
-        "cares/ares_version.c",
-        "cares/ares_writev.c",
-        "cares/bitncmp.c",
-        "cares/inet_net_pton.c",
-        "cares/inet_ntop.c",
-        "cares/windows_port.c",
+        "ares__close_sockets.c",
+        "ares__get_hostent.c",
+        "ares__read_line.c",
+        "ares__timeval.c",
+        "ares_cancel.c",
+        "ares_create_query.c",
+        "ares_data.c",
+        "ares_destroy.c",
+        "ares_expand_name.c",
+        "ares_expand_string.c",
+        "ares_fds.c",
+        "ares_free_hostent.c",
+        "ares_free_string.c",
+        "ares_getenv.c",
+        "ares_gethostbyaddr.c",
+        "ares_gethostbyname.c",
+        "ares_getnameinfo.c",
+        "ares_getopt.c",
+        "ares_getsock.c",
+        "ares_init.c",
+        "ares_library_init.c",
+        "ares_llist.c",
+        "ares_mkquery.c",
+        "ares_nowarn.c",
+        "ares_options.c",
+        "ares_parse_a_reply.c",
+        "ares_parse_aaaa_reply.c",
+        "ares_parse_mx_reply.c",
+        "ares_parse_naptr_reply.c",
+        "ares_parse_ns_reply.c",
+        "ares_parse_ptr_reply.c",
+        "ares_parse_soa_reply.c",
+        "ares_parse_srv_reply.c",
+        "ares_parse_txt_reply.c",
+        "ares_platform.c",
+        "ares_process.c",
+        "ares_query.c",
+        "ares_search.c",
+        "ares_send.c",
+        "ares_strcasecmp.c",
+        "ares_strdup.c",
+        "ares_strerror.c",
+        "ares_timeout.c",
+        "ares_version.c",
+        "ares_writev.c",
+        "bitncmp.c",
+        "inet_net_pton.c",
+        "inet_ntop.c",
+        "windows_port.c",
     ],
     hdrs = [
+        "ares.h",
         "ares_build.h",
-        "cares/ares.h",
-        "cares/ares_data.h",
-        "cares/ares_dns.h",
-        "cares/ares_getenv.h",
-        "cares/ares_getopt.h",
-        "cares/ares_inet_net_pton.h",
-        "cares/ares_iphlpapi.h",
-        "cares/ares_ipv6.h",
-        "cares/ares_library_init.h",
-        "cares/ares_llist.h",
-        "cares/ares_nowarn.h",
-        "cares/ares_platform.h",
-        "cares/ares_private.h",
-        "cares/ares_rules.h",
-        "cares/ares_setup.h",
-        "cares/ares_strcasecmp.h",
-        "cares/ares_strdup.h",
-        "cares/ares_version.h",
-        "cares/bitncmp.h",
-        "cares/config-win32.h",
-        "cares/nameser.h",
-        "cares/setup_once.h",
-    ] + select({
-        ":darwin": ["config_darwin/ares_config.h"],
-        "//conditions:default": ["config_linux/ares_config.h"],
-    }),
-    includes = [
-        ".",
-        "cares"
-    ] + select({
-        ":darwin": ["config_darwin"],
-        "//conditions:default": ["config_linux"],
-    }),
-    linkstatic = 1,
-    visibility = [
-        "//visibility:public",
+        "ares_config.h",
+        "ares_data.h",
+        "ares_dns.h",
+        "ares_getenv.h",
+        "ares_getopt.h",
+        "ares_inet_net_pton.h",
+        "ares_iphlpapi.h",
+        "ares_ipv6.h",
+        "ares_library_init.h",
+        "ares_llist.h",
+        "ares_nowarn.h",
+        "ares_platform.h",
+        "ares_private.h",
+        "ares_rules.h",
+        "ares_setup.h",
+        "ares_strcasecmp.h",
+        "ares_strdup.h",
+        "ares_version.h",
+        "bitncmp.h",
+        "config-win32.h",
+        "nameser.h",
+        "setup_once.h",
     ],
     copts = [
         "-D_GNU_SOURCE",
@@ -101,4 +116,13 @@ cc_library(
         "-DNOMINMAX",
         "-DHAVE_CONFIG_H",
     ],
+    data = [
+        ":ares_build",
+        ":ares_config",
+    ],
+    includes = ["."],
+    linkstatic = 1,
+    visibility = [
+        "//visibility:public",
+    ],
 )
diff --git a/third_party/cares/cares_local_files.BUILD b/third_party/cares/cares_local_files.BUILD
new file mode 100644
index 0000000000..0861b6fa6d
--- /dev/null
+++ b/third_party/cares/cares_local_files.BUILD
@@ -0,0 +1,21 @@
+package(
+    default_visibility = ["//visibility:public"],
+)
+
+config_setting(
+    name = "darwin",
+    values = {"cpu": "darwin"},
+)
+
+filegroup(
+    name = "ares_build_h",
+    srcs = ["ares_build.h"],
+)
+
+filegroup(
+    name = "ares_config_h",
+    srcs = select({
+        ":darwin": ["config_darwin/ares_config.h"],
+        "//conditions:default": ["config_linux/ares_config.h"],
+    }),
+)