add libatomic_ops (#4479)

* add libatomic_ops

* Update xmake.lua

* Update xmake.lua

---------

Co-authored-by: heheda123123 <you@example.com>
Co-authored-by: star9029 <hengxings783@gmail.com>

packages/l/libatomic_ops/xmake.lua

@@ -0,0 +1,38 @@
+package("libatomic_ops")
+    set_homepage("https://github.com/ivmai/libatomic_ops")
+    set_description("The atomic_ops project (Atomic memory update operations portable implementation)")
+    set_license("GPL-2.0")
+
+    add_urls("https://github.com/ivmai/libatomic_ops/releases/download/v$(version)/libatomic_ops-$(version).tar.gz",
+             "https://github.com/ivmai/libatomic_ops.git")
+
+    add_versions("7.8.2", "d305207fe207f2b3fb5cb4c019da12b44ce3fcbc593dfd5080d867b1a2419b51")
+
+    add_configs("gpl", {description = "Build atomic_ops_gpl library", default = false, type = "boolean"})
+
+    if is_plat("linux", "bsd") then
+        add_syslinks("pthread")
+    end
+
+    add_deps("cmake")
+
+    on_install(function (package)
+        local configs = {"-Denable_docs=OFF"}
+        table.insert(configs, "-DCMAKE_BUILD_TYPE=" .. (package:is_debug() and "Debug" or "Release"))
+        table.insert(configs, "-DBUILD_SHARED_LIBS=" .. (package:config("shared") and "ON" or "OFF"))
+
+        table.insert(configs, "-Denable_gpl=" .. (package:config("gpl") and "ON" or "OFF"))
+        import("package.tools.cmake").install(package, configs)
+
+        if package:config("shared") and package:is_plat("windows", "mingw", "cygwin") then
+            package:add("defines", "AO_DLL")
+        end
+    end)
+
+    on_test(function (package)
+        assert(package:check_csnippets({test = [[
+            void test() {
+                AO_t atomic_var;
+            }
+        ]]}, {includes = "atomic_ops.h"}))
+    end)