Add support for Bazel

bazel/.bazelversion

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+3.4.1

bazel/BUILD.bazel

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+# Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+# Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+cc_binary(
+    name = "HelloWorld",
+    srcs = ["main.cpp"],
+	deps = ["@spdlog"]
+)

bazel/README.md

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+# How to use spdlog with Bazel?
+
+1. Add to your `WORKSPACE` file this:
+
+    ```python
+    http_archive(
+        name = "spdlog",
+        build_file = "//:spdlog.BUILD",
+        sha256 = "f0114a4d3c88be9e696762f37a7c379619443ce9d668546c61b21d41affe5b62",
+        strip_prefix = "spdlog-1.7.0",
+        urls = ["https://github.com/gabime/spdlog/archive/v1.7.0.tar.gz"],
+    )
+    ```
+
+    
+
+2. Copy `spdlog.BUILD` to your workspace directry.
+
+Note: If you make use of the FMT library already in your project you can use that one also for spdlog: Remove the comments in the `spdlog.BUILD` file.
+
+**Example**
+
+This directory contains `WORKSPACE.bazel` file that how to integrate `spdlog` into your Bazel project.
+
+To test it run:
+
+```bash
+bazel run //:HelloWorld
+```
+

bazel/WORKSPACE.bazel

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+# Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+# Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+workspace(name = "spdlogDemo")
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+http_archive(
+    name = "spdlog",
+    build_file = "//:spdlog.BUILD",
+    sha256 = "f0114a4d3c88be9e696762f37a7c379619443ce9d668546c61b21d41affe5b62",
+    strip_prefix = "spdlog-1.7.0",
+    urls = ["https://github.com/gabime/spdlog/archive/v1.7.0.tar.gz"],
+)

bazel/main.cpp

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+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#include <spdlog/spdlog.h>
+#include <spdlog/sinks/basic_file_sink.h>
+
+#include <iostream>
+
+int main() {
+    spdlog::info("Welcome to spdlog!");
+    spdlog::error("Some error message with arg: {}", 1);
+}

bazel/spdlog.BUILD

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+# Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+# Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+cc_library(
+    name = "spdlog",
+    srcs = [
+        "src/async.cpp",
+        "src/cfg.cpp",
+        "src/color_sinks.cpp",
+        "src/file_sinks.cpp",
+        "src/fmt.cpp",
+        "src/spdlog.cpp",
+        "src/stdout_sinks.cpp",
+    ],
+    hdrs = glob(["include/**/*.h*"]),
+    defines = [
+        "SPDLOG_COMPILED_LIB",
+        #"SPDLOG_FMT_EXTERNAL",
+    ],
+    includes = ["include"],
+    linkopts = select({
+        "@bazel_tools//src/conditions:windows": [],
+        "@bazel_tools//src/conditions:darwin": [],
+        "//conditions:default": ["-lpthread"],
+    }),
+    visibility = ["//visibility:public"],
+    #deps = ["@fmt"],
+)