Python Build grpcio From Source (with OpenSSL)

By default (at least since v1.33.2), grpc is build with boringssl.

Perform the following to compile grpc with OpenSSL instead.

export REPO_ROOT=grpgit clone -b v1.33.2 https://github.com/grpc/grpc $REPO_ROOTcd $REPO_ROOTgit submodule update --initpip install -rrequirements.txtGRPC_PYTHON_BUILD_WITH_CYTHON=1 GRPC_BUILD_WITH_BORING_SSL_ASM=0 pip install .

The following doesn't work

GRPC_PYTHON_BUILD_WITH_CYTHON=1 GRPC_PYTHON_BUILD_SYSTEM_OPENSSL=1 GRPC_BUILD_WITH_BORING_SSL_ASM=0 pip install .

GRPC_PYTHON_BUILD_WITH_CYTHON=1 GRPC_PYTHON_BUILD_SYSTEM_OPENSSL=1 pip install .

due to

/usr/bin/ld: python_build/temp.linux-x86_64-3.8/third_party/boringssl-with-bazel/linux-x86_64/crypto/chacha/chacha-x86_64.o: in function `ChaCha20_ctr32':
  /tmp/pip-req-build-i1hyvo8u/third_party/boringssl-with-bazel/linux-x86_64/crypto/chacha/chacha-x86_64.S:56: undefined reference to `OPENSSL_ia32cap_P'
  /usr/bin/ld: python_build/temp.linux-x86_64-3.8/third_party/boringssl-with-bazel/linux-x86_64/crypto/chacha/chacha-x86_64.o: relocation R_X86_64_PC32 against undefined hidden symbol `OPENSSL_ia32cap_P' can not be used when making a shared object
  /usr/bin/ld: final link failed: bad value

If you bump into gcc: fatal error: Killed signal terminated program cc1plus, it is probably due to out of memory.

References: