out-of-source build only

in-source build is broken for some generators

recipes/onnx/all/conanfile.py

@@ -32,6 +32,10 @@ class OnnxConan(ConanFile):
     def _source_subfolder(self):
         return "source_subfolder"
 
+    @property
+    def _build_subfolder(self):
+        return "build_subfolder"
+
     def config_options(self):
         if self.settings.os == "Windows":
             del self.options.fPIC
@@ -73,7 +77,7 @@ def _configure_cmake(self):
         self._cmake.definitions["ONNX_VERIFY_PROTO3"] = tools.Version(self.deps_cpp_info["protobuf"].version).major == "3"
         if self.settings.compiler.get_safe("runtime"):
             self._cmake.definitions["ONNX_USE_MSVC_STATIC_RUNTIME"] = str(self.settings.compiler.runtime) in ["MT", "MTd", "static"]
-        self._cmake.configure()
+        self._cmake.configure(build_folder=self._build_subfolder)
         return self._cmake
 
     def build(self):