Add config options for tinyexpr. (#6820)

* Add config options for tinyexpr.

* Update xmake.lua

packages/t/tinyexpr/xmake.lua

@@ -7,15 +7,35 @@ package("tinyexpr")
     add_urls("https://github.com/codeplea/tinyexpr.git")
     add_versions("2022.11.21", "74804b8c5d296aad0866bbde6c27e2bc1d85e5f2")
 
+    add_configs("pow_from_right", { description = "Use right-to-left exponentiation.", default = false, type = "boolean" })
+    add_configs("natural_log", { description = "Let `log` default to the natural log instead of `log10`.", default = false, type = "boolean" })
+
     on_install(function (package)
         io.writefile("xmake.lua", [[
             add_rules("mode.debug", "mode.release")
+            
+            option("pow_from_right", { showmenu = true, default = false })
+            option("natural_log", { showmenu = true, default = false })
+
             target("tinyexpr")
                 set_kind("static")
                 add_files("tinyexpr.c")
                 add_headerfiles("tinyexpr.h")
+
+                if has_config("pow_from_right") then
+                    add_defines("TE_POW_FROM_RIGHT")
+                end
+
+                if has_config("natural_log") then
+                    add_defines("TE_NAT_LOG")
+                end
         ]])
-        import("package.tools.xmake").install(package)
+        
+        local configs = {
+            pow_from_right = package:config("pow_from_right"),
+            natural_log = package:config("natural_log"),
+        }
+        import("package.tools.xmake").install(package, configs)
     end)
 
     on_test(function (package)