Protobuf-36.1

#### Beyond Linux® From Scratch (System V Edition) - Version r13.1-84

### Chapter 9. General Libraries

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# Protobuf-36.1

## Introduction to Protobuf

The Protobuf package contains utilities and libraries for using data in Google's data interchange format.

### Note

Development versions of BLFS may not build or run some packages properly if LFS or dependencies have been updated since the most recent stable versions of the books.

### Package Information

- Download (HTTP): https://github.com/protocolbuffers/protobuf/releases/download/v36.1/protobuf-36.1.tar.gz

- Download MD5 sum: 012e748b8a400e93c15d2574b21551e8

- Download size: 7.0 MB

- Estimated disk space required: 118 MB

- Estimated build time: 1.2 SBU (with parallelism=4)

### Protobuf Dependencies

#### Required

Abseil-cpp-20260817.0 and CMake-4.4.3

#### Optional

gtest (for tests)

## Installation of Protobuf

Install Protobuf by running the following commands:

    mkdir build &&
    cd    build &&

    cmake -D CMAKE_INSTALL_PREFIX=/usr      \
          -D CMAKE_BUILD_TYPE=Release       \
          -D CMAKE_SKIP_INSTALL_RPATH=ON    \
          -D protobuf_BUILD_TESTS=OFF       \
          -D protobuf_BUILD_SHARED_LIBS=ON  \
          -G Ninja ..                       &&
    ninja

This package does come with a test suite, but it requires gtest, which is not part of BLFS.

Now, as the `root` user:

    ninja install

## Command Explanations

`-D CMAKE_SKIP_INSTALL_RPATH=ON`: This switch makes cmake remove hardcoded library search paths (rpath) when installing a binary executable file or a shared library. This package does not need rpath once it's installed into the standard location, and rpath may sometimes cause unwanted effects or even security issues.

`-D protobuf_BUILD_TESTS=OFF`: This parameter prevents the tests from being built because gtest is not part of BLFS.

`-D protobuf_BUILD_SHARED_LIBS=ON`: This parameter enables building shared versions of the libraries provided by this package instead of static versions.

## Contents

Installed Programs: protoc (a symlink to protoc-36.1.0), protoc-gen-upb (a symlink to protoc-gen-upb-36.1.0), and protoc-gen-upbdefs (a symlink to protoc-gen-upbdefs-36.1.0) protoc-gen-upb_minitable(a symlink to protoc-gen-upb_minitable-36.1.0)
Installed Libraries: libprotobuf.so, libprotobuf-lite.so, libprotoc.so, libupb.a, libutf8_range.so, and libutf8_validity.so
Installed Directories: /usr/include/google, /usr/include/upb, /usr/lib/cmake/protobuf, and /usr/lib/cmake/utf8_range

### Short Descriptions

protoc | parses protocol buffer files and generates output for several programming languages and formats
`libprotobuf.so` | contains functions for utilizing data in Google's data interchange format
`libprotobuf-lite.so` | contains a simpler version of the functions for utilizing data in Google's data interchange format
`libprotoc.so` | contains functions used by protoc at runtime for outputting data for several programming languages and formats
`libupb.a` | is a small protobuf implementation written in C
`libutf8_range.so` | contains functions that allow a program to determine whether a sequence of characters is a valid UTF-8 sequence
`libutf8_validity.so` | contains functions that allow a program to determine whether a sequence of bytes is a valid UTF-8 sequence, and to find what the longest valid prefix of the sequence is

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