Compiling multiple files

[Alexis Lecoq]

Hi,

I do not find how can I compile multiple files at once. 

I have this architecture :
/protobuff/

              1st.proto

              2nd.proto

              3rd.proto

              drivers/

                         driver1.proto

                         driver2.proto

1st.proto is importing 2nd, 3rd, and driver1

2nd is importing driver1

3rd is importing driver1 and driver2

I'm trying to compile using this command :
generator-bin\nanopb_generator .\protobuff\1st.proto

but getting not found errors for each import:
protobuff/1st.proto:8:1: Import "2nd.proto" was not found or had errors.
protobuff/1st.proto:9:1: Import "3rd.proto" was not found or had errors.
protobuff/1st.proto:11:1: Import "drivers/driver1.proto" was not found or had errors.

etc...

I guess that's not the right way to compile it ?

A second annoying thing I encounter is that I need to duplicate each proto file because for nanopb to output C code for a byte array for example :

optional bytes EPC = 2 [(nanopb).max_size = 24];

We need to specify the max_size like this.

The thing is that when trying to compile the same file with protoc to output java code, it does not compile due to this. 

[Petteri Aimonen]

Hi,

You need to define the include path with -I, for example:
generator-bin\nanopb_generator -I protobuff .\protobuff\1st.proto
By default it looks for included files in the current directory.

You can define options in a separate .options file.
This way the Java compiler doesn't see them.
You can wildcards to specify e.g. "*.EPC max_size:24" if you have a lot of similar fields.
Refer to:
https://jpa.kapsi.fi/nanopb/docs/reference.html#defining-the-options-in-a-.options-file
https://github.com/nanopb/nanopb/blob/master/examples/network_server/fileproto.options

--
Petteri

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[Alexis Lecoq]

Thanks ! But how to include the ones in "drivers" then ?

I tried using this command :

generator-bin\nanopb_generator -I .\protobuff -I .\protobuff\drivers\ .\protobuff\*.proto .\protobuff\drivers\*.proto

It finds all the files under "protobuff" but it does not manage to find the files under "drivers"

Thanks.

[Petteri Aimonen]

Hi,

To me it seems like that command should work.

The include path is directly passed to protoc, so the same include
path setup should work as you are using with the Java protoc.

--
Petteri

> > <https://groups.google.com/d/msgid/nanopb/1c27fe2d-d259-429b...@googlegroups.com?utm_medium=email&utm_source=footer>

> >
> >
> >
>
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> Thanks ! But how to include the ones in "drivers" then ?
>
> I tried using this command :
> generator-bin\nanopb_generator -I .\protobuff -I .\protobuff\drivers\
> .\protobuff\*.proto .\protobuff\drivers\*.proto
>
> It finds all the files under "protobuff" but it does not manage to find
> the files under "drivers"
>
> Thanks.
>
> Le mardi 13 mai 2025 à 11:49:45 UTC+2, Petteri Aimonen a écrit :
>
> Hi,
> You need to define the include path with -I, for example:
> generator-bin\nanopb_generator -I protobuff .\protobuff\1st.proto
> By default it looks for included files in the current directory.
> You can define options in a separate .options file.
> This way the Java compiler doesn't see them.
> You can wildcards to specify e.g. "*.EPC max_size:24" if you have a
> lot of similar fields.
> Refer to:

> [1]https://jpa.kapsi.fi/nanopb/docs/reference.html#defining-the-opti
> ons-in-a-.options-file
> [2]https://github.com/nanopb/nanopb/blob/master/examples/network_ser

> send an email to [3]nanopb+un...@googlegroups.com.

> > To view this discussion visit

> [4]https://groups.google.com/d/msgid/nanopb/1c27fe2d-d259-429b-8b12-

> > an email to [1][5]nanopb+un...@googlegroups.com.

> > To view this discussion visit
> >

> [2][6]https://groups.google.com/d/msgid/nanopb/1c27fe2d-d259-429b-8b
> 12-5f6
> > 77f4f3da0n%[7]40googlegroups.com.
> >
> > References
> >
> > 1. mailto:[8]nanopb+un...@googlegroups.com
> > 2.
> [9]https://groups.google.com/d/msgid/nanopb/1c27fe2d-d259-429b...@go
> oglegroups.com?utm_medium=email&utm_source=footer

>
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> [11]https://groups.google.com/d/msgid/nanopb/22e6d7e8-3cda-4756-bfe1-9b
> a72d134267n%40googlegroups.com.
>
> References
>
> 1. https://jpa.kapsi.fi/nanopb/docs/reference.html#defining-the-options-in-a-.options-file
> 2. https://github.com/nanopb/nanopb/blob/master/examples/network_server/fileproto.options
> 3. file:///tmp/neomutt.html
> 4. https://groups.google.com/d/msgid/nanopb/1c27fe2d-d259-429b...@googlegroups.com
> 5. file:///tmp/neomutt.html
> 6. https://groups.google.com/d/msgid/nanopb/1c27fe2d-d259-429b-8b12-5f6
> 7. http://40googlegroups.com/
> 8. file:///tmp/neomutt.html
> 9. https://groups.google.com/d/msgid/nanopb/1c27fe2d-d259-429b...@googlegroups.com?utm_medium=email&utm_source=footer
> 10. mailto:nanopb+un...@googlegroups.com
> 11. https://groups.google.com/d/msgid/nanopb/22e6d7e8-3cda-4756...@googlegroups.com?utm_medium=email&utm_source=footer