Can CPython be compiled with Clang?

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I'm trying to build CPython using Clang, with very specific requirements:

I tried setting env variable CC to my clang executable location (i.e. /opt/llvm/5/bin/clang, but the ./configure command fails with the following:
configure: error: C compiler cannot create executables

What flags should I set to make this build work?

cpython clang c python
2 Answers

As the commenters on OP's post pointed out, you can compile cpython with clang. Here are reproducible instructions, in the form of a Dockerfile.

FROM ubuntu:16.04
WORKDIR /opt/cpython-2.7.14
RUN apt-get update -qq \
    && apt-get install --yes build-essential curl \
    # Install clang
    && curl -fsSL https://releases.llvm.org/5.0.0/clang+llvm-5.0.0-linux-x86_64-ubuntu16.04.tar.xz \
    | tar xJ -C /usr/local --strip-components 1 \
    && curl -fsSL https://www.python.org/ftp/python/2.7.14/Python-2.7.14.tgz \
    | tar xz --strip-components 1 \
    && CC=/usr/local/bin/clang ./configure --prefix /usr/local/cpython-2.7.14 \
    && make \
    && make install
ENTRYPOINT ["/usr/local/cpython-2.7.14/bin/python"]

docker build --tag cpython:2.7 .
docker run --rm cpython:2.7 --version
# Python 2.7.14

It is difficult to say what OP's original issue was, because it seemed like a problem with the clang installation. Looking at the configure logs would provide more information.

Disclaimer: Python 2 has reached its end of life, and ubuntu 16.04 reaches its end of life in April 2021.

user_56660870

tried setting env variable CC to my clang executable location

On Linux, define an alias in Bash as follows: alias cc="clang"

On my system I set it as alias cc="clang-11"

Also, be sure to have installed all clang and llvm packages on the system.

user_125098970
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