Various fixes, warnings:

* Fix sig_wait
* Fix websocket strict aliasing warning
* Fix invokable strict aliasing
* Silence fread warning in examples
* Silence integer conversion warnings
* Build parser-bench as test
* Disable unused variable warning for asio:
    Caused by static variables declared in <boost/asio/error.hpp>
    No known workaround.

test/http/parser.cpp

@@ -7,3 +7,63 @@
 
 // Test that header file is self-contained.
 #include <beast/http/parser.hpp>
+
+#include <beast/http/headers.hpp>
+#include <beast/http/string_body.hpp>
+#include <beast/detail/unit_test/suite.hpp>
+
+namespace beast {
+namespace http {
+
+class parser_test : public beast::detail::unit_test::suite
+{
+public:
+    void run() override
+    {
+        {
+            error_code ec;
+            parser<true, string_body,
+                basic_headers<std::allocator<char>>> p;
+            std::string const s =
+                "GET / HTTP/1.1\r\n"
+                "User-Agent: test\r\n"
+                "Content-Length: 1\r\n"
+                "\r\n"
+                "*";
+            p.write(s.data(), s.size(), ec);
+            expect(! ec);
+            expect(p.complete());
+            auto m = p.release();
+            expect(m.method == method_t::http_get);
+            expect(m.url == "/");
+            expect(m.version == 11);
+            expect(m.headers["User-Agent"] == "test");
+            expect(m.body == "*");
+        }
+        {
+            error_code ec;
+            parser<false, string_body,
+                basic_headers<std::allocator<char>>> p;
+            std::string const s =
+                "HTTP/1.1 200 OK\r\n"
+                "Server: test\r\n"
+                "Content-Length: 1\r\n"
+                "\r\n"
+                "*";
+            p.write(s.data(), s.size(), ec);
+            expect(! ec);
+            expect(p.complete());
+            auto m = p.release();
+            expect(m.status == 200);
+            expect(m.reason == "OK");
+            expect(m.version == 11);
+            expect(m.headers["Server"] == "test");
+            expect(m.body == "*");
+        }
+    }
+};
+
+BEAST_DEFINE_TESTSUITE(parser,http,beast);
+
+} // http
+} // beast