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Code Issues 155 Wiki Activity

Copy the Python runtime next to the executable only when the Python install has changed

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Hirek
2026-10-16 23:37:27 +02:00
parent 6ee628aaa5
commit 0662df23a7
2 changed files with 42 additions and 2 deletions
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5
CMakeLists.txt
View File

@@ -647,8 +647,9 @@ if(WIN32 AND WITH_PYTHON)
TARGET ${PROJECT_NAME} POST_BUILD
COMMAND ${CMAKE_COMMAND} -E copy_if_different "${EU07_PY_DLL}" "$<TARGET_FILE_DIR:${PROJECT_NAME}>"
COMMAND ${CMAKE_COMMAND} -E copy_if_different "${EU07_PY_ZLIB}" "$<TARGET_FILE_DIR:${PROJECT_NAME}>"
COMMAND ${CMAKE_COMMAND} -E copy_directory "${EU07_PY_LIBDIR}" "$<TARGET_FILE_DIR:${PROJECT_NAME}>/python64/Lib"
COMMAND ${CMAKE_COMMAND} -E copy_directory "${EU07_PY_DLLSDIR}" "$<TARGET_FILE_DIR:${PROJECT_NAME}>/python64/DLLs"
# Lib with its site-packages is huge, the script copies it only when the Python install has changed
COMMAND ${CMAKE_COMMAND} "-DPY_LIBDIR=${EU07_PY_LIBDIR}" "-DPY_DLLSDIR=${EU07_PY_DLLSDIR}" "-DDEST_DIR=$<TARGET_FILE_DIR:${PROJECT_NAME}>"
-P "${CMAKE_CURRENT_SOURCE_DIR}/CMake_modules/CopyPythonRuntime.cmake"
)
endif()

39
CMake_modules/CopyPythonRuntime.cmake Normal file
View File

@@ -0,0 +1,39 @@
# Copies the Python runtime (Lib and DLLs) used by the embedded interpreter next to the executable.
# Run as a post-build step: cmake -DPY_LIBDIR=... -DPY_DLLSDIR=... -DDEST_DIR=... -P CopyPythonRuntime.cmake
#
# Lib also carries the site-packages of whichever Python install the build found, which can be tens of thousands
# of files. Copying them after every link took minutes, so the copy is skipped while the source install looks
# unchanged since the last copy. Delete <exe dir>/python64/.eu07_python_runtime to force a refresh.
foreach(_var PY_LIBDIR PY_DLLSDIR DEST_DIR)
if(NOT DEFINED ${_var})
message(FATAL_ERROR "CopyPythonRuntime.cmake: ${_var} is not set")
endif()
endforeach()
# directory timestamps change when pip adds or removes a package, or the Python install itself is replaced
set(_stamp "")
foreach(_path "${PY_LIBDIR}" "${PY_LIBDIR}/site-packages" "${PY_DLLSDIR}")
file(TIMESTAMP "${_path}" _time "%Y-%m-%dT%H:%M:%S" UTC)
string(APPEND _stamp "${_path} ${_time}\n")
endforeach()
set(_stamp_file "${DEST_DIR}/python64/.eu07_python_runtime")
set(_old_stamp "")
if(EXISTS "${_stamp_file}")
file(READ "${_stamp_file}" _old_stamp)
endif()
if(NOT _old_stamp STREQUAL _stamp)
message(STATUS "Copying the Python runtime to ${DEST_DIR}/python64")
foreach(_pair "${PY_LIBDIR}|Lib" "${PY_DLLSDIR}|DLLs")
string(REPLACE "|" ";" _pair "${_pair}")
list(GET _pair 0 _source)
list(GET _pair 1 _target)
execute_process(COMMAND "${CMAKE_COMMAND}" -E copy_directory_if_different "${_source}" "${DEST_DIR}/python64/${_target}" RESULT_VARIABLE _result)
if(NOT _result EQUAL 0)
message(FATAL_ERROR "CopyPythonRuntime.cmake: copying ${_source} failed")
endif()
endforeach()
file(WRITE "${_stamp_file}" "${_stamp}")
endif()