Modern C++ development with alpine linux, cmake, clang inside a docker container

CMakeLists.txt

set(CMAKE_C_COMPILER clang)
set(CMAKE_CXX_COMPILER clang++)

cmake_minimum_required(VERSION 3.18)
set(APP_NAME "example-app")
project("${APP_NAME}")

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O3 -std=c++20 -Wno-multichar")


include_directories(
    "${PROJECT_SOURCE_DIR}/include"
)

file(
    GLOB
    SOURCES
    "src/**/*.cpp"
    "src/*.cpp"
)

set(
    PROJECT_LINK_LIBS
    pthread
    dl
)

add_executable("${APP_NAME}" ${SOURCES})
target_link_libraries("${APP_NAME}" ${PROJECT_LINK_LIBS})

docker-compose.yml

version: '3.7'

services:
  dev:
    build: .
    environment:
      APP_NAME: example-app
      APP_EXEC: 1
    volumes:
      - ./include:/code/include
      - ./src:/code/src
      - ./CMakeLists.txt:/code/CMakeLists.txt

Dockerfile

FROM alpine:latest

RUN apk update \
  && apk upgrade \
  && apk add --no-cache \
    clang \
    clang-dev \
    alpine-sdk \
    dpkg \
    cmake \
    ccache \
    python3

RUN ln -sf /usr/bin/clang /usr/bin/cc \
  && ln -sf /usr/bin/clang++ /usr/bin/c++ \
  && update-alternatives --install /usr/bin/cc cc /usr/bin/clang 10\
  && update-alternatives --install /usr/bin/c++ c++ /usr/bin/clang++ 10\
  && update-alternatives --auto cc \
  && update-alternatives --auto c++ \
  && update-alternatives --display cc \
  && update-alternatives --display c++ \
  && ls -l /usr/bin/cc /usr/bin/c++ \
  && cc --version \
  && c++ --version

WORKDIR /code

ENV APP_NAME=''

ENTRYPOINT ["/code/entrypoint.sh"]

entrypoint.sh

#!/usr/bin/env sh

if test -d "build"; then
  rm -rf build;
fi

mkdir -p build
cd build
cmake ..
make -j20

if [ "${APP_EXEC}" -eq "1" ]; then
  ./$APP_NAME
fi