Project: MongoDB (App Definition and Development / Database)
File: building.md

gRPC C++ - Building from source =========================== This document has detailed instructions on how to build gRPC C++ from source. Note that it only covers the build of gRPC itself and is meant for gRPC C++ contributors and/or power users. Other should follow the user instructions. See the instructions for guidance on how to add gRPC as a dependency to a C++ application (there are several ways and system-wide installation is often not the best choice). ```sh $ [sudo] apt-get install build-essential autoconf libtool pkg-config ``` If you plan to build using CMake ```sh $ [sudo] apt-get install cmake ``` If you are a contributor and plan to build and run tests, install the following as well: ```sh $ # clang and LLVM C++ lib is only required for sanitizer builds $ [sudo] apt-get install clang libc++-dev ``` On a Mac, you will first need to install Xcode or and then run the following command from a terminal: ```sh $ [sudo] xcode-select --install ``` To build gRPC from source, you may need to install the following packages from : ```sh $ brew install autoconf automake libtool shtool ``` If you plan to build using CMake, follow the instructions from https://cmake.org/download/ Tip: when building, you may want to explicitly set the `LIBTOOL` and `LIBTOOLIZE` environment variables when running `make` to ensure the version installed by `brew` is being used: ```sh $ LIBTOOL=glibtool LIBTOOLIZE=glibtoolize make ``` To prepare for cmake + Microsoft Visual C++ compiler build Install Visual Studio 2019 or later (Visual C++ compiler will be used). Install . Install . Install and add it to `PATH` (`choco install nasm`) - required by boringssl (Optional) Install (`choco install ninja`) Before building, you need to clone the gRPC github repository and download submodules containing source code for gRPC's dependencies (that's done by the `submodule` command or `--recursive` flag). Use following commands to clone the gRPC repository at the ```sh $ git clone -b RELEASETAGHERE https://github.com/grpc/grpc $ cd grpc $ git submodule update --init ``` ``` git clone -b RELEASETAGHERE https://github.com/grpc/grpc cd grpc git submodule update --init ``` NOTE: The `bazel` build tool uses a different model for dependencies. You only need to worry about downloading submodules if you're building with something else than `bazel` (e.g. `cmake`). In the C++ world, there's no "standard" build system that would work for all supported use cases and on all supported platforms. Therefore, gRPC supports several major build systems, which should satisfy most users. Depending on your needs we recommend building using `bazel` or `cmake`. Bazel is the primary build system for gRPC C++. If you're comfortable using bazel, we can certainly recommend it. Using bazel will give you the best developer experience in addition to faster and cleaner builds. You'll need `bazel` version `1.0.0` or higher to build gRPC. See for instructions how to install bazel on your system. We support building with `bazel` on Linux, MacOS and

From the grpc repository root ``` $ bazel build :all ``` ``` $ bazel test --config=dbg //test/... ``` NOTE: If you are a gRPC maintainer and you have access to our test cluster, you should use our to get significant improvement to the build and test speed (and a bunch of other very useful features). Run from the grpc directory after cloning the repo with --recursive or updating submodules. ``` $ mkdir -p cmake/build $ cd cmake/build $ cmake ../.. $ make ``` If you want to build shared libraries (`.so` files), run `cmake` with `-DBUILDSHAREDLIBS=ON`. When using the "Visual Studio" generator, cmake will generate a solution (`grpc.sln`) that contains a VS project for every target defined in `CMakeLists.txt` (+ a few extra convenience projects added automatically by cmake). After opening the solution with Visual Studio you will be able to browse and build the code. ``` @rem Run from grpc directory after cloning the repo with --recursive or updating submodules. md .build cd .build cmake .. -G "Visual Studio 16 2019" cmake --build . --config Release ``` Using gRPC C++ as a DLL is not recommended, but you can still enable it by running `cmake` with `-DBUILDSHAREDLIBS=ON`. Please note that when using Ninja, you will still need Visual C++ (part of Visual Studio) installed to be able to compile the C/C++ sources. ``` @rem Run from grpc directory after cloning the repo with --recursive or updating submodules. cd cmake md build cd build call "%VS140COMNTOOLS%..\..\VC\vcvarsall.bat" x64 cmake ..\.. -GNinja -DCMAKEBUILDTYPE=Release cmake --build . ``` Using gRPC C++ as a DLL is not recommended, but you can still enable it by running `cmake` with `-DBUILDSHAREDLIBS=ON`. Windows DLL build is supported at a "best effort" basis and we don't recommend using gRPC C++ as a DLL as there are some known drawbacks around how C++ DLLs work on Windows. For example, there is no stable C++ ABI and you can't safely allocate memory in one DLL, and free it in another etc. That said, we don't actively prohibit building DLLs on windows (it can be enabled in cmake with `-DBUILDSHAREDLIBS=ON`), and are free to use the DLL builds at your own risk. you've been warned that there are some important drawbacks and some things might not work at all or will be broken in interesting ways. we don't have extensive testing for DLL builds in place (to avoid maintenance costs, increased test duration etc.) so regressions / build breakages might occur gRPC's CMake build system has two options for handling dependencies. CMake can build the dependencies for you, or it can search for libraries that are already installed on your system and use them to build gRPC. This behavior is controlled by the `gRPC<depname>PROVIDER` CMake variables, e.g. `gRPCCARESPROVIDER`. The options that these variables take are as follows: module - build dependencies alongside gRPC. The source code is obtained from gRPC's git submodules. package - use external copies of dependencies that are already available on your

These could come from your system package manager, or perhaps you pre-installed them using CMake with the `CMAKEINSTALLPREFIX` option. For example, if you set `gRPCCARESPROVIDER=module`, then CMake will build c-ares before building gRPC. On the other hand, if you set `gRPCCARESPROVIDER=package`, then CMake will search for a copy of c-ares that's already installed on your system and use it to build gRPC. Perform the following steps to install gRPC using CMake. Set `-DgRPC_INSTALL=ON` Build the `install` target The install destination is controlled by the variable. If you are running CMake v3.13 or newer you can build gRPC's dependencies in "module" mode and install them alongside gRPC in a single step. If you are building gRPC < 1.27 or if you are using CMake < 3.13 you will need to select "package" mode (rather than "module" mode) for the dependencies. This means you will need to have external copies of these libraries available on your system. This shows how to install dependencies with cmake before proceeding to installing gRPC itself. ``` $ cmake ../.. -DgRPC_INSTALL=ON \ -DCMAKEBUILDTYPE=Release \ -DgRPCABSLPROVIDER=package \ -DgRPCCARESPROVIDER=package \ -DgRPCPROTOBUFPROVIDER=package \ -DgRPCRE2PROVIDER=package \ -DgRPCSSLPROVIDER=package \ -DgRPCZLIBPROVIDER=package $ make $ make install ``` You can use CMake to cross-compile gRPC for another architecture. In order to do so, you will first need to build `protoc` and `grpccppplugin` for the host architecture. These tools are used during the build of gRPC, so we need copies of executables that can be run natively. You will likely need to install the toolchain for the platform you are targeting for your cross-compile. Once you have done so, you can write a toolchain file to tell CMake where to find the compilers and system tools that will be used for this build. This toolchain file is specified to CMake by setting the `CMAKETOOLCHAINFILE` variable. ``` $ cmake ../.. -DCMAKETOOLCHAINFILE=path/to/file $ make ``` Best efforts are made to bump the SONAME revision during ABI breaches. While a change in the SONAME clearly indicates an ABI incompatibility, no hard guarantees can be made about any sort of ABI stability across the same SONAME version. NOTE: `make` used to be gRPC's default build system, but we're no longer recommending it. You should use `bazel` or `cmake` instead. The `Makefile` is only intended for internal usage and is not meant for public consumption. From the grpc repository root ```sh $ make ``` NOTE: if you get an error on linux such as 'aclocal-1.15: command not found', which can happen if you ran 'make' before installing the pre-reqs, try the following: ```sh $ git clean -f -d -x && git submodule foreach --recursive git clean -f -d -x $ [sudo] apt-get install build-essential autoconf libtool pkg-config $ make ``` By default gRPC uses , you will need the `protoc` compiler to generate stub server and client code. If you compile gRPC from source, as described above, the Makefile will automatically try compiling the `protoc` in third_party if you cloned the repository recursively and it detects that you do not already have 'protoc' compiler installed.