Written by Niels Moseley
on July 21, 2023

Auto-downloading CPM

The CPM package manager is a light-weight way of downloading compile dependencies. Their documentation and Wiki have some code snippets on how to use CPM, but not all snippets work flawlessly. So here is a code snippet for auto-downloading the CPM package manager in a CMAKE script.

########################################################################
# Check for CPM
########################################################################

set(CPM_DOWNLOAD_VERSION 0.38.2)

if(CPM_SOURCE_CACHE)
    set(CPM_DOWNLOAD_LOCATION "${CPM_SOURCE_CACHE}/cpm/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
elseif(DEFINED ENV{CPM_SOURCE_CACHE})
    set(CPM_DOWNLOAD_LOCATION "$ENV{CPM_SOURCE_CACHE}/cpm/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
else()
    set(CPM_DOWNLOAD_LOCATION "${CMAKE_BINARY_DIR}/cmake/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
endif()

if(NOT (EXISTS ${CPM_DOWNLOAD_LOCATION}))
    message(STATUS "Downloading CPM.cmake to ${CPM_DOWNLOAD_LOCATION}")
    file(DOWNLOAD "https://github.com/cpm-cmake/CPM.cmake/releases/download/v${CPM_DOWNLOAD_VERSION}/CPM.cmake" ${CPM_DOWNLOAD_LOCATION}
    )
endif()

message("${CPMstatus}")

include(${CPM_DOWNLOAD_LOCATION})

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