Add xmake

.gitignore

@@ -6,6 +6,7 @@
 !.gitignore
 !codecov.yml
 !skeleton.html
+!**/xmake.lua
 !**/meson.build
 !**/*.wrap
 !meson_options.txt

tests/tests.d

@@ -645,7 +645,7 @@ version (unittest)
 else:
 	extern (C) int main()
 {
-
+	version (D_BetterC)printf("BetterC\n");
 	void dispatch(EntityManager.JobGroup jobs) nothrow @nogc
 	{
 		foreach (job; jobs.jobs)

xmake.lua

@@ -0,0 +1,103 @@
+add_rules("mode.debug", "mode.release")
+
+option("betterC")
+    set_default(false)
+    if get_config("dc") == "gcc" then
+        add_dcflags("-fno-druntime")
+    else
+        add_dcflags("-betterC")
+    end 
+
+target("bubel-ecs")
+    set_kind("static")
+    set_basename("BubelECS")
+    add_files("source/bubel/**.d")
+    add_includedirs("source", {public = true})
+    set_options("betterC")
+
+target("tests")
+    set_kind("binary")
+    set_basename("BubelECSTests")
+    add_files("tests/*.d|tests.d")
+    add_includedirs(".", {public = true})
+    set_options("betterC")
+    add_deps("bubel-ecs")
+    add_dcflags("-unittest")
+
+target("test")
+    set_kind("binary")
+    set_basename("BubelECSTest")
+    add_files("tests/tests.d")
+    add_includedirs(".", {public = true})
+    set_options("betterC")
+    add_deps("bubel-ecs")
+
+--
+-- If you want to known more usage about xmake, please see https://xmake.io
+--
+-- ## FAQ
+--
+-- You can enter the project directory firstly before building project.
+--
+--   $ cd projectdir
+--
+-- 1. How to build project?
+--
+--   $ xmake
+--
+-- 2. How to configure project?
+--
+--   $ xmake f -p [macosx|linux|iphoneos ..] -a [x86_64|i386|arm64 ..] -m [debug|release]
+--
+-- 3. Where is the build output directory?
+--
+--   The default output directory is `./build` and you can configure the output directory.
+--
+--   $ xmake f -o outputdir
+--   $ xmake
+--
+-- 4. How to run and debug target after building project?
+--
+--   $ xmake run [targetname]
+--   $ xmake run -d [targetname]
+--
+-- 5. How to install target to the system directory or other output directory?
+--
+--   $ xmake install
+--   $ xmake install -o installdir
+--
+-- 6. Add some frequently-used compilation flags in xmake.lua
+--
+-- @code
+--    -- add debug and release modes
+--    add_rules("mode.debug", "mode.release")
+--
+--    -- add macro defination
+--    add_defines("NDEBUG", "_GNU_SOURCE=1")
+--
+--    -- set warning all as error
+--    set_warnings("all", "error")
+--
+--    -- set language: c99, c++11
+--    set_languages("c99", "c++11")
+--
+--    -- set optimization: none, faster, fastest, smallest
+--    set_optimize("fastest")
+--
+--    -- add include search directories
+--    add_includedirs("/usr/include", "/usr/local/include")
+--
+--    -- add link libraries and search directories
+--    add_links("tbox")
+--    add_linkdirs("/usr/local/lib", "/usr/lib")
+--
+--    -- add system link libraries
+--    add_syslinks("z", "pthread")
+--
+--    -- add compilation and link flags
+--    add_cxflags("-stdnolib", "-fno-strict-aliasing")
+--    add_ldflags("-L/usr/local/lib", "-lpthread", {force = true})
+--
+-- @endcode
+--
+