add asmjit (#467)

packages/a/asmjit/xmake.lua

@@ -0,0 +1,45 @@
+package("asmjit")
+
+    set_homepage("https://asmjit.com/")
+    set_description("AsmJit is a lightweight library for machine code generation written in C++ language.")
+    set_license("zlib")
+
+    add_urls("https://github.com/asmjit/asmjit.git")
+    add_versions("210627", "d02235b83434943b52a6d7c57118205c5082de08")
+
+    add_deps("cmake")
+    if is_plat("linux") then
+        add_syslinks("rt")
+    end
+    on_load("windows", "macosx", "linux", function (package)
+        if not package:config("shared") then
+            package:add("defines", "ASMJIT_STATIC")
+        end
+    end)
+
+    on_install("windows", "macosx", "linux", function (package)
+        local configs = {}
+        table.insert(configs, "-DCMAKE_BUILD_TYPE=" .. (package:debug() and "Debug" or "Release"))
+        table.insert(configs, "-DASMJIT_STATIC=" .. (package:config("shared") and "OFF" or "ON"))
+        import("package.tools.cmake").install(package, configs)
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            typedef int (*Func)(void);
+            void test() {
+                using namespace asmjit;
+                JitRuntime rt;
+                CodeHolder code;
+                code.init(rt.environment());
+                x86::Assembler a(&code);
+                a.mov(x86::eax, 1);  // Emits 'mov eax, 1' - moves one to 'eax' register.
+                a.ret();             // Emits 'ret'        - returns from a function.
+                Func fn;
+                rt.add(&fn, &code);
+                int result = fn();
+                rt.release(fn);
+                return;
+            }
+        ]]}, {configs = {languages = "c++17"}, includes = "asmjit/asmjit.h"}))
+    end)