Require pybind 2.6 from environment for gmxapi Python package extension module.

[alexxy/gromacs.git] / cmake / gmxPythonDiscovery.cmake

diff --git a/cmake/gmxPythonDiscovery.cmake b/cmake/gmxPythonDiscovery.cmake
index b482a8bdf0644044534aa66e22dc85ee9cdc06d3..c6adf6954222c11fcb98c4fcf790cedec4be35c7 100644 (file)
--- a/cmake/gmxPythonDiscovery.cmake
+++ b/cmake/gmxPythonDiscovery.cmake
@@ -33,7 +33,30 @@
 # the research papers on the package. Check out http://www.gromacs.org.
 
 # Perform Python installation discovery early and in one place, for consistency.
-#
+
+if($<VERSION_GREATER_EQUAL:${CMAKE_VERSION},"3.18">)
+    # With embedded packages in this repository, the module-scoped default behavior of
+    # FindPython3 version/component requirements and artifact specification is likely
+    # confusing (at best) or leading to bad logic (at worst).
+    # https://cmake.org/cmake/help/latest/module/FindPython3.html#artifacts-specification
+    option(Python3_ARTIFACTS_INTERACTIVE TRUE
+           "Make artifacts specification global and cached.")
+elseif(NOT FIND_PACKAGE_MESSAGE_DETAILS_Python3)
+    # On first run, check whether the user has triggered the behavior described above.
+    if (Python3_EXECUTABLE
+            OR Python3_COMPILER
+            OR Python3_DOTNET_LAUNCHER
+            OR Python3_LIBRARY
+            OR Python3_INCLUDE_DIR
+            OR Python3_NumPy_INCLUDE_DIR)
+        message(WARNING
+                "Specifying FindPython3 artifacts may complicate consistent Python detection "
+                "in projects bundled with GROMACS. See "
+                "https://cmake.org/cmake/help/latest/module/FindPython3.html#artifacts-specification"
+                )
+    endif ()
+endif()
+
 # Note: If necessary, the Python location can be hinted with Python3_ROOT_DIR
 # For additional parameters affecting Python installation discovery, see
 # https://cmake.org/cmake/help/latest/module/FindPython3.html#hints