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CMake_External_Project.md

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CMake External Project

You can add the AWS SDK as an external project and use the same CMake parameters from a CMake file instead.

Generic format

cmake_minimum_required(VERSION 3.x)
project(<project-name> NONE)
include(ExternalProject)

ExternalProject_Add(<project-name>
    GIT_REPOSITORY    https://github.com/aws/aws-sdk-cpp.git
    GIT_TAG           <tag>
    CMAKE_ARGS        <CMake-options>
    BUILD_ALWAYS      TRUE
    TEST_COMMAND      ""
)

where, <tag> could be origin/master or one of the versions.

Note that the required minimmum CMake version is 3.x.

External project SAMPLE

cmake_minimum_required(VERSION 3.10.2)
project(libawscpp-download NONE)
include(ExternalProject)

ExternalProject_Add(libawscpp-download
    GIT_REPOSITORY    https://github.com/aws/aws-sdk-cpp.git
    GIT_TAG           1.8.17
    LIST_SEPARATOR    "|"
    CMAKE_ARGS       -DBUILD_SHARED_LIBS=OFF
                     -DBUILD_ONLY=monitoring|logs
    BUILD_ALWAYS      TRUE
    TEST_COMMAND      ""
)

If the GIT_TAG points to a version >= 1.7.0, third party dependencies aws-c-common, aws-checksums and aws-c-event-stream are built by default and installed in default system directory. To customize how they are handled you can also install them separately, if you do so, make sure to include -DBUILD_DEPS=OFF in CMAKE_ARGS.

The SDK's CMake file expects a semilcolon separated list of components for BUILD_ONLY CMake argument, however, since ExternalProject_Add processes list arguments differently, you'll need to use LIST_SEPARATOR to indicate how the elements of the list are split, or which character will replace the semicolon. (For more information, refer to this issue)