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-rw-r--r--cmake/project-is-top-level.cmake6
1 files changed, 6 insertions, 0 deletions
diff --git a/cmake/project-is-top-level.cmake b/cmake/project-is-top-level.cmake
new file mode 100644
index 0000000..3435fc0
--- /dev/null
+++ b/cmake/project-is-top-level.cmake
@@ -0,0 +1,6 @@
+# This variable is set by project() in CMake 3.21+
+string(
+ COMPARE EQUAL
+ "${CMAKE_SOURCE_DIR}" "${PROJECT_SOURCE_DIR}"
+ PROJECT_IS_TOP_LEVEL
+)