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python: support DESTDIR in pip install step #863

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python: support DESTDIR in pip install step #863

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12 changes: 11 additions & 1 deletion python/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -28,8 +28,18 @@ install(CODE [[
if(NOT _pip_check EQUAL 0)
message(WARNING "Skipping Python package install: pip not available for ${Python3_EXECUTABLE}.")
else()
set(_pip_install_args
install
--no-deps
--no-build-isolation
--break-system-packages
--prefix ${CMAKE_INSTALL_PREFIX})
if(DEFINED ENV{DESTDIR} AND NOT "$ENV{DESTDIR}" STREQUAL "")
list(APPEND _pip_install_args --root "$ENV{DESTDIR}")
endif()
list(APPEND _pip_install_args .)
execute_process(
COMMAND ${Python3_EXECUTABLE} -m pip install --no-deps --break-system-packages .
COMMAND ${Python3_EXECUTABLE} -m pip ${_pip_install_args}
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/python
OUTPUT_VARIABLE _pip_output
ERROR_VARIABLE _pip_error
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