[tests] add test for custom target and macro com API limitations

tests/misc/projects/Issue11128/InitMacro.hx

@@ -0,0 +1,25 @@
+import haxe.macro.Compiler;
+import haxe.macro.Context;
+import haxe.macro.Type;
+
+class InitMacro {
+	static function setup() {
+		switch (Compiler.getConfiguration().platform) {
+			case CustomTarget("mylang"): {}
+			case _: throw "this shouldnt happen.";
+		}
+
+		Context.onAfterTyping(check);
+	}
+
+	static function check(types:Array<ModuleType>) {
+		for (m in types) {
+			switch (m) {
+				case TClassDecl(_.get() => c):
+					for (f in c.fields.get()) f.expr();
+
+				case _:
+			}
+		}
+	}
+}

tests/misc/projects/Issue11128/Main2.hx

@@ -0,0 +1 @@
+function main() {}

tests/misc/projects/Issue11128/compile5.hxml

@@ -0,0 +1,3 @@
+-main Main2
+--custom-target mylang=out
+--macro InitMacro.setup()

tests/misc/projects/Issue11128/mylang/Init.hx

@@ -0,0 +1,6 @@
+package mylang;
+
+class Init {
+	public static function init() {
+	}
+}