execute_process ignoring options

Code
#1

Hello, I’m trying to get an execute_process command working, and so far, it seems like its ignoring options of the command itself.
The command I’m trying to run is:
python3 -B file.py
The -B option is the problem: it specifies for python to NOT write.pyc files on import, typically into a pycache directory. But it continues to do so.

Some examples that I’ve tried:
execute_process(COMMAND python3 -B file.py)
execute_process(COMMAND “python3 -B file.py”)
execute_process(COMMAND “python3” “-B” “file.py”)
set(PYCMD “python3 -B file.py”)
execute_process(COMMAND ${PYCMD})
execute_process(COMMAND “${PYCMD}”)
set(PYCMD python3 -B file.py)
execute_process(COMMAND ${PYCMD})
execute_process(COMMAND “${PYCMD}”)
set(PYCMD “python3” “-B” “file.py”)
execute_process(COMMAND ${PYCMD})
execute_process(COMMAND “${PYCMD}”)

I’ve also tried variations with the -B to see if an escape char was needed to no avail.

I’ve set RESULT_VARIABLE, OUTPUT_VARIABLE, and ERROR_VARIABLE on these, and I never seen an error, the result is always 0 (success), and the output prints out a string that says the command worked (ie file.py prints out a string on success of doing its work)

I’ve also tried setting the environmental variable PYTHONDONTWRITEBYTECODE=1 which should cause the python3 to not write the bytecode either, but it still does.

thank you, any help would be appreciated.

#2

What happens if you run it outside of CMake? Does it exhibit the behavior you expect there?

#3

When I run the command manually, it operates as expected - no .pyc files created, no pycache directory created.

#4

Hmm. CMake doesn’t really interfere at all here. Some investigation into what is happening here would be needed on your machine. Here’s my test:

==> foo.py <==
print('bar')

==> bar.py <==
import foo

==> foo.cmake <==
execute_process(COMMAND python3 -B bar.py)
if (EXISTS "${CMAKE_CURRENT_FILE_DIR}/__pycache__")
  message(FATAL_ERROR "boo")
endif ()

This works on my machine at least.