# CMAKE_PROJECT_SPDX_LICENSE

Added in version 4.3.

The license(s) of the top level project.

This variable holds the license expression of the project as specified in the top level CMakeLists.txt file by a `project()` command. In the event that the top level CMakeLists.txt contains multiple `project()` calls, the most recently called one from that top level CMakeLists.txt will determine the value that `CMAKE_PROJECT_SPDX_LICENSE` contains. For example, consider the following top level CMakeLists.txt:

    cmake_minimum_required(VERSION 4.3)
    project(First SPDX_LICENSE "BSD-3-Clause")
    project(Second SPDX_LICENSE "BSD-3-Clause AND CC-BY-SA-4.0")
    add_subdirectory(sub)
    project(Third SPDX_LICENSE "BSD-3-Clause AND CC0-1.0")

And `sub/CMakeLists.txt` with the following contents:

    project(SubProj SPDX_LICENSE Apache-2.0)
    message("CMAKE_PROJECT_SPDX_LICENSE = ${CMAKE_PROJECT_SPDX_LICENSE}")

The most recently seen `project()` command from the top level CMakeLists.txt would be `project(Second ...)`, so this will print:

    CMAKE_PROJECT_SPDX_LICENSE = BSD-3-Clause AND CC-BY-SA-4.0

To obtain the version from the most recent call to `project()` in the current directory scope or above, see the `PROJECT_SPDX_LICENSE` variable.