在 Linux 上使用 CMake 构建 gRPC C++

Question

I'm trying to build gRPC (cpp) using CMake, but running into errors. I am able to successfully build gRPC with make per the instructions on the gRPC cpp page . Using make is deprecated, but CMake isn't working for me.

After following the instructions for downloading, cloning etc., I go to the "Building with CMake", where it says for Linux/Unix, do this:

$ mkdir -p cmake/build
$ cd cmake/build
$ cmake ../..
$ make

For me, it fails at the 3rd line ( cmake ). The following is the output:

$ cmake ../..
-- The C compiler identification is GNU 7.4.0
-- The CXX compiler identification is GNU 7.4.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Error at CMakeLists.txt:138 (include):
  include could not find load file:

    cmake/zlib.cmake

< repeats above error for the following .cmake files: cares, protobuf, ssl, gflags, benchmark, address_sorting and nanopb>

Those files ( cmake/<package name>.cmake ) don't exist in the cmake/ directory on my system. I'm not sure what in the CMakeLists.txt file would cause them to appear there.

Researching this issue, I tried various combinations of cmake options such as -DBUILD_SHARED_LIBS=ON , -DgRPC_INSTALL=ON , and -DgRPC<package_name>_PROVIDER=package for each of the fails listed above. I always get the same errors. Finally, I tried running the run_distrib_test_cmake.sh script. It eventually failed the same way.

Any ideas?

Answer 1

The third party CMake files (eg cmake/zlib.cmake ) do exist in the GitHub repository you cloned (see here ). Please be sure your repository finished cloning completely, to include all of the submodules, per the gRPC build documentation :

Run from grpc directory after cloning the repo with --recursive or updating submodules.

 $ mkdir -p cmake/build $ cd cmake/build $ cmake ../.. $ make

So be sure everything is cloned with:

git checkout --recurse-submodules

or

git submodule update --recursive

Answer 2

As @squareskittles points out, the cmake directory is part of the clone. I probably inadvertently deleted and re-created it.

Other than this, the only other thing I had to do which was not mentioned for Linux builds, was to install golang ( sudo apt-get install golang ). This was mentioned as a prerequisite for Windows, but I think it should more accurately be described as a prerequisite for CMake builds, as it seems to be necessary for Linux, CMake builds.