![]() ![]() Note the COPY lines that use –from=build. Since we statically linked our libraries we don’t even need those, but we do need the GCC libs since we built with GCC and Alpine uses musl C. Here our dependencies are reduced as we don’t need the compilers or dev packages. The second FROM statement begins the next section of our multi-stage build. ![]() There is no entry point for this container because all we need it to do is run once and build our output. The final RUN statement builds the application using CMake. The COPY line copies the host machine src folder into the container. We are pulling in vcpkg to get our library dependencies. The first line invokes the package manager and pulls down packages like build-essential for compilers and the dev packages for the libraries I need. We’ve used the AS keyword on the FROM line to identify this stage of the build so we can refer to in subsequent stages. The first section of the Dockerfile describes the build environment for our application. ![]() LABEL description="Run container - findfaces"ĬOPY -from=build /src/haarcascade_frontalface_alt2.xml /usr/local/faces/haarcascade_frontalface_alt2.xmlĬOPY -from=build /src/out/findfaces /usr/local/faces/findfaces DCMAKE_TOOLCHAIN_FILE=/tmp/vcpkg/scripts/buildsystems/vcpkg.cmake -DVCPKG_TARGET_TRIPLET=圆4-linux-musl \ tmp/vcpkg/vcpkg install boost-asio boost-filesystem fmt http-parser opencv restinio bootstrap-vcpkg.sh -useSystemBinariesĬOPY 圆4-linux-musl.cmake /tmp/vcpkg/triplets/ LABEL description="Build container - findfaces"Īutoconf build-base binutils cmake curl file gcc g git libgcc libtool linux-headers make musl-dev ninja tar unzip wget Here is a complete multi-stage Dockerfile that produces a build container for compiling the application, followed by a runtime container that takes that output and only has the dependencies necessary for running the application as opposed to building it. ![]() This is an app that exposes a service to receive an image, processes the image using OpenCV to circle any found faces, and exposes another endpoint to retrieve the processed image. Let’s look at a multi-stage build Dockerfile for a C app. To see a full example of before and after multi-stage builds were available I recommend looking at the official Docker multi-stage build documentation. Multi-stage builds are a lot more convenient than that approach and less fragile. This spread the definition of related containers across multiple Dockerfiles that were often driven together via scripts. Prior to the availability of this capability it was common to see build container definitions where output was copied to the host and later copied into deployment containers. You can also name your build stages and copy output from early stages into the later stages. Multi-stage builds are Dockerfiles that use multiple FROM statements where each begins a new stage of the build. This is relevant to anyone doing C development regardless what tools you are using. This post will show you how you can leverage the capabilities of multi-stage containers for your C development. Unfortunately, it is hard to find guidance on how to use newer techniques like multi-stage builds. It’s fairly easy to find Dockerfiles that provide various C environments. Makefile:82: recipe for target 'all' failedĬMakeList.txt cmake_minimum_required(VERSION 3.Updated January 10, 2020: Corrected link to article source that was broken by refactoring in the repo.Ĭontainers are a great tool for configuring reproducible build environments. Mingw32-make.exe: *** Error 2ĬMakeFiles\Makefile2:66: recipe for target 'CMakeFiles/untitled1.dir/all' failed Mingw32-make.exe: *** Error 1ĬMakeFiles\untitled1.dir\build.make:96: recipe for target 'untitled1.exe' failed Linking CXX executable untitled1.exeĬMakeFiles\untitled1.dir/objects.a(): In function `_static_initialization_and_destruction_0':Ĭ:/undefined reference to `boost::system::generic_category()'Ĭ:/In function `ZN5boost4asio5error19get_system_categoryEv':Ĭ:/In function `ZN5boost4asio6detail17winsock_init_base7startupERNS2_4dataEhh':Ĭ:/undefined reference to error: ld returned 1 exit status Building CXX object CMakeFiles/untitled1.dir/ Scanning dependencies of target untitled1 Build files have been written to: C:/Users/shellus/.CLion2016.2/system/cmake/generated/untitled1-f8bd5d82/f8bd5d82/Debug ![]()
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