Modify a driver file out-of-tree

[mjm987]

I tried to patch a Zephyr driver file (eg. drivers/modem/gsm_ppp.c) out-of-tree by copying the driver file to the application src directory and modifying it...

But when building I get a "multiple definition of ...".
I tried to remove the original source in CMakeLists.txt by
list(FILTER Zephyr EXCLUDE REGEX ".*drivers/modem/gsm_ppp.c")
but it didn't work.

Same problem when cloning the driver as an EXTRA_MODULE.

PS: Possibly it might be done by cloning the driver as a EXTRA_MODULE and renaming all the CONFIG_* options, but this is definitively not what I want to do.

Any hints?

[aravinth-kalai]

Hi @mjm987 ,

Did you got any idea to fix this if yes please share your input, I'm also having the same issue.

[ndrs-pst]

@aravinth-kalai, I think it may related to this discussion #53210 and also here #52229

[mjm987]

Unfortunately I didn't find a easy solution to copy/use the driver into the project directory so I created a local branch in the zephyr tree, patched the source there and rebase it every time I pull the zephyr master tree.

[ndrs-pst]

@mjm987, Absolutely, that's a great approach! 😄
A well-considered patch, if merged via a pull request into the mainline, can indeed help minimize your maintenance efforts.
Keep up the good work!