Is it possible to build the C++ runtime without building the protoc compiler ?

[Fabrice Gautier]

Hi,

I'm trying to build just the C++ runtime library, without rebuilding the protoc compiler or requiring that protoc be available during the runtime build.

I'm looking at  building either or both the -lite and regular runtime library (depending on what is easier or doable)

Can the existing Makefile do this ? Or would this require makefile surgery ? 

Thanks.

[Adam Cozzette]

Why do you want to avoid rebuilding protoc? I'm not sure offhand how easy it would be to avoid building it.

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[Fabrice Gautier]

On Wednesday, May 22, 2019 at 12:57:22 PM UTC-7, Adam Cozzette wrote:

Why do you want to avoid rebuilding protoc? I'm not sure offhand how easy it would be to avoid building it.

Because:

- The build environment is a cross compile environment that does not have a native toolchain.

- The build environment won't allow running executables that are generated by the build itself.

- So all the generated code is pre-generated and checked-in, so it's not needed.

- But I still need to build the runtime libraries.

It seems like other languages (eg: objective-C) can build their runtime without rebuilding a compiler, so it feels like C++ should be able to do the same.

Ideally, protoc and the runtime libraries would be part of that build environment / SDK, so that I could run protoc as part of the build and would not have to worry about rebuilding the runtime for my project, but that's not something I can control at this point.

And yes, I also have to accept the fact that I better be using the same version of protoc and the runtime I'm building.

On Mon, May 20, 2019 at 1:50 PM Fabrice Gautier <fabrice...@gmail.com> wrote:

Hi,

I'm trying to build just the C++ runtime library, without rebuilding the protoc compiler or requiring that protoc be available during the runtime build.

I'm looking at  building either or both the -lite and regular runtime library (depending on what is easier or doable)

Can the existing Makefile do this ? Or would this require makefile surgery ? 

Thanks.

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[Adam Cozzette]

Oh, I see. I have not looked into this in a while but you can run "./configure --with-protoc=..." to specify an alternative protoc to use during the build for cross-compiling. README.md has a bit more information on this.

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[hons...@gmail.com]

I have similar question, is there a way to only build c++ runtime?