If the last search path is _defaultResRootPath, addSearchPath(path) should not force that the last path is still default resource root path.
I made this mistake and broke the compatibiliy, since I thought resource root path definitely is low priority while search in most case. However, I should not make this assumption.
Anyway, dear developers, thanks for all of you review cocos2d-x source code. I accept any suggestion, any blame. I think everyone makes mistake more or less.
The key point is that `PLEASE DON'T MAKE THE SAME MISTAKE SECOND TIME, THIRD TIME`.
So please don't blame our developers who makes mistakes. We need to work together with all our developers to make our engine better and better.
And in fact, I never think that I deal with cocos2d-x source code as my 'own branch' although I contributed lots of code to it. I didn't push any code to repo directly since I sent Pull Requests. Every one could review code and comment in pull request. We encourage more communication with our developers in github or the forum. You could say GOOD , BAD or SHIT, but please do your best to respect every developer who made a contribution.
Thanks all of you. Good luck!
PROBLEM
-------
cocos makefile is not self-containing.
From the perspective of a developer that link his target with
`cocos2dx_static` library, it should specify in his `Android.mk` only
a path to a makefile that defines that module, by
a) using `import-add-path` and `import-module`
$(call import-add-path, <path-to-cocos-root>)
$(call import-module, cocos)
or ...
b) using directly an `include` command
include <path-to-cocos-root>/cocos/Android.mk
Unfortunately the current configuration of cocos' Android.mk doesn't
specify (using `import-add-path`) locations of modules that it uses.
In result, every dev that uses cocos to create Android app has to
populate NDK_MODULE_PATH at his Android.mk files by adding two lines:
$(call import-add-path, <path-to-cocos-root>/cocos)
$(call import-add-path, <path-to-cocos-root>/external)
Those lines have to be placed at cocos/Android.mk file.
The current configuration of build script breaks a good practice of
hiding internal details from clients of library or component. In fact
the script exposes internal dependencies and require from a dev to make
them out.
---
SOLUTION
This commit adds corresponding `import-add-path` commands to Android.mk
files.
---
HOW TO TEST
1. Create cocos2d-x app.
2. Import in your Android.mk file a `cocos` module using one of
aforementioned approaches.
3. The app should compile without a error message like the one below:
Android NDK: jni/../../cocos2d/cocos/Android.mk: Cannot find module with tag 'freetype2/prebuilt/android' in import path
Android NDK: Are you sure your NDK_MODULE_PATH variable is properly defined ?
Issue: https://github.com/cocos2d/cocos2d-x/issues/18392
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