add mold (#919)

* add mold

* Update xmake.lua

packages/m/mold/xmake.lua

@@ -0,0 +1,46 @@
+package("mold")
+    set_kind("binary")
+    set_homepage("https://github.com/rui314/mold")
+    set_description("mold: A Modern Linker")
+
+    add_urls("https://github.com/rui314/mold.git")
+    add_versions("1.0.1", "fe209f3f4c7177b0613f8c10f38862a23d8fb8f0")
+
+    add_deps("cmake", "pkg-config", "zlib")
+    if is_plat("linux") then
+        add_deps("openssl")
+    end
+
+    on_install("linux", "macosx", function (package)
+        local configs = {}
+        local cflags = {}
+        local ldflags = {}
+        for _, name in ipairs({"zlib", "openssl"}) do
+            local dep = package:dep(name)
+            if dep then
+                local depinfo = dep:fetch()
+                if depinfo then
+                    for _, includedir in ipairs(depinfo.includedirs or depinfo.sysincludedirs) do
+                        table.insert(cflags, "-I" .. includedir)
+                    end
+                    for _, linkdir in ipairs(depinfo.linkdirs) do
+                        table.insert(ldflags, "-L" .. linkdir)
+                    end
+                end
+            end
+        end
+        if #cflags > 0 then
+            table.insert(configs, "EXTRA_CFLAGS=" .. table.concat(cflags, " "))
+            table.insert(configs, "EXTRA_CXXFLAGS=" .. table.concat(cflags, " "))
+        end
+        if #ldflags > 0 then
+            table.insert(configs, "EXTRA_LDFLAGS=" .. table.concat(ldflags, " "))
+        end
+        table.insert(configs, "mold")
+        import("package.tools.make").make(package, configs)
+        os.cp("mold", package:installdir("bin"))
+    end)
+
+    on_test(function (package)
+        os.vrun("mold --version")
+    end)