Re: [protobuf] How to use a different protoc version?

[Feng Xiao]

On Thu, Apr 26, 2018 at 6:22 PM elmer <l...@seas.upenn.edu> wrote:

Hi there,

When I want use the gRPC and make the C++ files, I got the following error:

error: This file was generated by an older version of protoc which is

error: incompatible with your Protocol Buffer headers. Please

error: regenerate this file with a newer version of protoc.

It seems that I have installed different versions in my system (macOS). I checked my protoc version using the command "protoc --version", I got 

libprotoc 3.2.0

Then, I try to upgrade my protoc using the "brew upgrade protobuf", I got 

protobuf 3.5.1_1 already installed

So I also noticed the version 3.5.1 protoc is in /usr/local/opt/protobuf/share/doc/protobuf . And in /usr/local/opt there is a protobuf folder and a protobuf@3.5 folder. So I think the error I got when I make the C++ file is caused because the 3.5.1 version of protoc is needed but the 3.2.0 version is used.

Am I right? If yes, how can I switch from 3.2.0 to the 3.5.1 version?

I suggest you uninstall the versions you don't need and only keep one version at a time. That would make things easier.

 

Thanks!

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