g3log 1.1 (new formula)

Add g3 logging C++11 lib formula
https://github.com/KjellKod/g3log

Closes #48318.

Signed-off-by: Andrew Janke <andrew@apjanke.net>

Library/Formula/g3log.rb

@@ -0,0 +1,38 @@
+class G3log < Formula
+  desc 'asynchronous, "crash safe", logger that is easy to use.'
+  homepage "https://github.com/KjellKod/g3log"
+  url "https://github.com/KjellKod/g3log/archive/v1.1.tar.gz"
+  sha256 "b6374819ec9ba56807eeaa6f11e889f33550b1296524a5e7831ce9adc1218a9c"
+
+  depends_on "cmake" => :build
+
+  def install
+    system "cmake", ".", *std_cmake_args
+    system "make"
+
+    # No install target yet: https://github.com/KjellKod/g3log/issues/49
+    include.install "src/g3log"
+    lib.install "libg3logger.a"
+    lib.install "libg3logger_shared.dylib" => "libg3logger.dylib"
+    system "install_name_tool", "-id", "#{lib}/libg3logger.dylib", "#{lib}/libg3logger.dylib"
+  end
+
+  test do
+    (testpath/"test.cpp").write <<-EOS.undent.gsub(/TESTDIR/, testpath)
+      #include <g3log/g3log.hpp>
+      #include <g3log/logworker.hpp>
+      int main()
+      {
+        using namespace g3;
+        auto worker = LogWorker::createLogWorker();
+        worker->addDefaultLogger("test", "TESTDIR");
+        g3::initializeLogging(worker.get());
+        LOG(DEBUG) << "Hello World";
+        return 0;
+      }
+    EOS
+    system ENV.cxx, "-std=c++11", "test.cpp", "-L#{lib}", "-lg3logger", "-o", "test"
+    system "./test"
+    Dir.glob(testpath/"test.g3log.*.log").any?
+  end
+end