add snmalloc (#1296)

* add snmalloc

* improve snmalloc

* fix snmalloc

* improve snmalloc

* add /FS

* improve snmalloc

packages/s/snmalloc/xmake.lua

@@ -0,0 +1,31 @@
+package("snmalloc")
+    set_homepage("https://github.com/microsoft/snmalloc")
+    set_description("Message passing based allocator")
+    set_license("MIT")
+
+    add_urls("https://github.com/microsoft/snmalloc/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/microsoft/snmalloc.git")
+    add_versions("0.6.0", "de1bfb86407d5aac9fdad88319efdd5593ca2f6c61fc13371c4f34aee0b6664f")
+
+    add_deps("cmake")
+
+    if is_plat("windows") then
+        add_syslinks("onecore")
+    end
+
+    on_install("macosx", "windows", "linux", "bsd", function (package)
+        local configs = {}
+        table.insert(configs, "-DCMAKE_BUILD_TYPE=" .. (package:debug() and "Debug" or "Release"))
+        table.insert(configs, "-DBUILD_SHARED_LIBS=" .. (package:config("shared") and "ON" or "OFF"))
+        local cxflags
+        if package:is_plat("windows") then
+            cxflags = "/FS"
+        end
+        import("package.tools.cmake").install(package, configs, {cxflags = cxflags})
+        os.cp("src/snmalloc", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        assert(package:has_cxxfuncs("snmalloc::DefaultPal::message(\"\")",
+            {includes = "snmalloc/snmalloc.h", configs = {languages = "c++20", cxflags = "-mcx16"}}))
+    end)