Hi all,
I case I have the same arduino library in :
- C:\Program Files (x86)\Arduino\hardware\XXX\avr\libraries\MyLibrary\
- C:\Users\User\Documents\Arduino\libraries\MyLibrary\

How to tell Visual Micro to use the user one ?
Right now, it selects the system one

Thanks.

Oh sorry.
Here are the informations.

The library in question is "LittleFS".
I installed it in the C:\Users\User\Documents\Arduino\libraries\ folder to apply some modifications. But it already exists in C:\Program Files (x86)\Arduino\hardware\XXX\avr\libraries\

Thanks for your explanations.
The two libraries have "architectures=*" in their library.properties files.
So, I changed the one on my user folder with "architectures=avr"
I reloaded the toolchain & libraries scan but it continues to use the platform one :/

Here the library.properties files :

C:\Users\User\Documents\Arduino\libraries\
name=LittleFS
version=1.0.0-custom
author=Paul Stoffregen/Custom
maintainer=Paul Stoffregen/Custom
sentence=LittleFS for Teensy
paragraph=Access flash memory chips as a filesystem, build in top of ARM's littlefs.
category=Data Storage
url=https://github.com/PaulStoffregen/LittleFS
architectures=avr


C:\Program Files (x86)\Arduino\hardware\XXX\avr\libraries\
name=LittleFS
version=1.0.0
author=Paul Stoffregen
maintainer=Paul Stoffregen
sentence=LittleFS for Teensy
paragraph=Access flash memory chips as a filesystem, build in top of ARM's littlefs.
category=Data Storage
url=https://github.com/PaulStoffregen/LittleFS
architectures=*

In attachment the build log.


I also tried to change the architectures=* of the platform library by replacing the "*" by "noexist".
Does not change the result :/

No. The name of the folder is "LittleFS-master" (I download it from github)

Great. yes it is better to put version numbers in parent folder. For example

Libraries\LittleFS\1.0.1\LittleFS

or

Libraries\LittleFS-1.0.1\LittleFS

This because for Arduino we don't specify library paths, they have to be "guessed" at runtime. If two libraries contain "xyz.h" then how do we work out which to use? There is a set of rules that Arduino uses such as:-

Is there a library folder name that matches the .h? If yes then use that one.

Is there a library folder name that matches the .h but also ends with -master? If yes then a github zip was used to install the library. use that one.

If we can't find any #included header that matches a lib folder name then look for any library that contains the .h name. Not very accurate.

In this case you had an exact library folder name that matched a .h. It was in the platform/libraries folder so it was used. 

The library that you installed into sketchbook libraries would have been considered an entirely different library. It would have won only if the LittleFS in platform/libraries had a different name too. Then the LittleFS.h would have been used from the one in sketchbook/libaries.

The architectures= would only apply after two libs of same name are found.

Hopefully this helps.

It is an idea you could mention to them on their github site. It does make sense but suspect it might make support more difficult.

The architectures= alongside single user installed libs location is probably up for consideration already