C ares test (#48)

* c-ares to be built with CMake+Ninja, c-ares version test

* remove not relevant comment

examples/BUILD

@@ -4,6 +4,7 @@ test_suite(
         "//examples/cmake:test_libgd",
         "//examples/cmake:test_libpng",
         "//examples/cmake:test_zlib",
+        "//examples/cmake_cares:test_c_ares",
         "//examples/ninja:test_ninja_version",
     ],
 )

examples/cmake_cares/BUILD

@@ -17,7 +17,19 @@ cmake_external(
         "CARES_SHARED": "no",
         "CARES_STATIC": "on",
     },
+    cmake_options = ["-GNinja"],
     lib_source = "@cares//:all",
+    make_commands = [
+        "ninja",
+        "ninja install",
+    ],
     static_libraries = ["libcares.a"],
     tools_deps = [":ninjatool"],
 )
+
+cc_test(
+    name = "test_c_ares",
+    srcs = ["c-ares-test.cpp"],
+    visibility = ["//:__pkg__"],
+    deps = [":cares"],
+)

examples/cmake_cares/c-ares-test.cpp

@@ -0,0 +1,14 @@
+#include "ares.h"
+
+#include <iostream>
+#include <string.h>
+
+int main(int argc, char* argv[])
+{
+  int version = 0;
+  const char* strVersion = ares_version(&version);
+  if (strcmp(strVersion, "1.14.0") != 0) {
+    throw std::runtime_error("Wrong version: " + std::string(strVersion));
+  }
+  std::cout << "C-ares version: " << strVersion;
+}