version bump for 1.1.1 and version check scripts enforced by CI (#113)

.circleci/config.yml

@@ -27,6 +27,9 @@ jobs:
                 exit 1
               fi
             done
+      - run:
+          name: Check version info is up-to-date
+          command: ./test/version/version_check
       - run:
           name: Build source dependencies
           command: |

include/datadog/version.h

@@ -6,7 +6,7 @@
 namespace datadog {
 namespace version {
 
-const std::string tracer_version = "v1.0.1";
+const std::string tracer_version = "v1.1.1";
 const std::string cpp_version = std::to_string(__cplusplus);
 
 }  // namespace version

test/version/current_version.cc

@@ -0,0 +1,8 @@
+#include <datadog/version.h>
+
+#include <iostream>
+
+int main() {
+  std::cout << datadog::version::tracer_version << std::endl;
+  return 0;
+}

test/version/version_check

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+if ! cd "${0%/*}"; then
+    echo "failed to change working directory"
+    exit 1
+fi
+
+if ! type git > /dev/null; then
+    echo "git not available."
+    exit 0
+fi
+
+if ! type g++ > /dev/null; then
+    echo "g++ not available."
+    exit 0
+fi
+
+if ! g++ -I"$(git rev-parse --show-toplevel)"/include -o current_version current_version.cc; then
+    echo "failed to compile current_version.cc"
+    exit 1
+fi
+if ! version=$(./current_version); then
+    echo "failed to execute current_version"
+    exit 1
+fi
+if ! [[ "$version" ]]; then
+    echo "empty version info"
+    exit 1
+fi
+rm ./current_version
+
+if ! git rev-parse "$version" &>/dev/null; then
+    # already updated
+    exit 0
+fi
+
+head_ts=$(git show -s --format=%ct HEAD)
+vers_ts=$(git show -s --format=%ct "$version")
+
+if ((head_ts > vers_ts)); then
+    echo "version tag is outdated and needs an update"
+    exit 1
+fi