Merge pull request #32 from DataDog/cgilmour/bazel

Add build files for bazel

.gitignore

@@ -33,3 +33,6 @@
 *.exe
 *.out
 *.app
+
+# Bazel
+bazel-*

BUILD.bazel

@@ -0,0 +1,51 @@
+cc_library(
+    name = "dd_opentracing_cpp",
+    srcs = glob(["src/*.cpp", "src/*.h"]) + [
+        ":version_number.h",
+    ],
+    hdrs = [
+        "include/datadog/opentracing.h",
+    ],
+    strip_include_prefix = "include",
+    visibility = ["//visibility:public"],
+    deps = [
+        "//:3rd_party_nlohmann",
+        "@io_opentracing_cpp//:opentracing",
+        "@com_github_msgpack_msgpack_c//:msgpack",
+    ],
+    copts = ["-std=c++14"],
+)
+
+genrule(
+    name = "generate_version_number_h",
+    srcs = glob([
+         "CMakeLists.txt",
+         "src/*",
+    ]),
+    outs = [
+      "version_number.h"
+    ],
+    cmd = """
+    TEMP_DIR=$$(mktemp -d)
+    trap -- 'rm -r $$TEMP_DIR' EXIT
+    VERSION_NUMBER_H_OUT=$${PWD}/$(location :version_number.h)
+    CMAKE_ROOT=$$(dirname $${PWD}/$(location :CMakeLists.txt))
+    cd $$TEMP_DIR
+    cmake -DHEADERS_ONLY=ON -L $$CMAKE_ROOT
+    mv version_number.h $$VERSION_NUMBER_H_OUT
+    """,
+)
+
+cc_library(
+    name = "3rd_party_nlohmann",
+    hdrs = ["3rd_party/include/nlohmann/json.hpp"],
+    strip_include_prefix = "3rd_party/include",
+    visibility = ["//visibility:public"],
+)
+
+cc_library(
+    name = "3rd_party_catch2",
+    hdrs = ["3rd_party/include/catch2/catch.hpp"],
+    strip_include_prefix = "3rd_party/include",
+    visibility = ["//visibility:public"],
+)

CMakeLists.txt

@@ -6,6 +6,7 @@ option(BUILD_SHARED "Builds shared library" ON)
 option(BUILD_STATIC "Builds static library" OFF)
 option(BUILD_PLUGIN "Builds plugin (requires gcc and not macos)" OFF)
 option(BUILD_TESTING "Builds tests, also enables BUILD_SHARED" OFF)
+option(HEADERS_ONLY "Only generate version_number.h" OFF)
 
 if(BUILD_TESTING)
   set(BUILD_SHARED ON)
@@ -37,6 +38,10 @@ configure_file(
   "${PROJECT_BINARY_DIR}/version_number.h")
 include_directories("${PROJECT_BINARY_DIR}")
 
+if(HEADERS_ONLY)
+  return()
+endif()
+
 # Dependencies
 find_path(OPENTRACING_INCLUDE_DIR NAMES opentracing/tracer.h)
 find_library(OPENTRACING_LIB opentracing)

WORKSPACE

@@ -0,0 +1,17 @@
+workspace(name = "com_github_datadog_dd_opentracing_cpp")
+
+git_repository(
+    name = "io_opentracing_cpp",
+    remote = "https://github.com/opentracing/opentracing-cpp",
+    commit = "ac50154a7713877f877981c33c3375003b6ebfe1",
+)
+
+new_http_archive(
+    name = "com_github_msgpack_msgpack_c",
+    sha256 = "9859d44d336f9b023a79a3026bb6a558b2ea346107ab4eadba58236048650690",
+    strip_prefix = "msgpack-3.0.1",
+    urls = [
+        "https://github.com/msgpack/msgpack-c/releases/download/cpp-3.0.1/msgpack-3.0.1.tar.gz",
+    ],
+    build_file = "bazel/external/msgpack.BUILD"
+)

bazel/external/msgpack.BUILD

@@ -0,0 +1,13 @@
+cc_library(
+    name = "msgpack",
+    srcs = glob([
+        "src/*.c",
+        "include/**/*.h",
+        "include/**/*.hpp",
+    ]),
+    includes = [
+        "include",
+    ],
+    strip_include_prefix = "include",
+    visibility = ["//visibility:public"],
+)