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We now bring updates to the previous tangle root, by marking incremental-demo-p1 as the parent of our current tangle:

```{lit-setup}
:tangle-root: incremental-demo-p2
:parent: incremental-demo-p1
```

Warning

The same tangle root cannot have multiple parents!

For instance, we add a new source file:

add_executable(App main.cpp foo.h foo.cpp)

Tangled

Tangled block 'file: CMakeLists.txt' [from here]

cmake_minimum_required(VERSION 3.0...3.25)
project(
	LearnWebGPU # name of the project, which will also be the name of the visual studio solution if you use it
	VERSION 0.1.0 # any version number
	LANGUAGES CXX C # programming languages used by the project
)

add_executable(App main.cpp foo.h foo.cpp)
set_target_properties(App PROPERTIES
	CXX_STANDARD 17
	COMPILE_WARNING_AS_ERROR ON
)
if (MSVC)
	target_compile_options(App PRIVATE /W4)
else()
	target_compile_options(App PRIVATE -Wall -Wextra -pedantic)
endif()
# One last note..

We can also tangle only the diff wrt. the previous version:

TODO
```{tangle} CMake, file: CMakeLists.txt
:diff:
```