BLD: Use the correct Python interpreter when running tempita.py #24971
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When a program located by find_program is executable directly, meson will execute it. If it is a script, its shebang (#!) line will control which interpreter is used. tempita.py specifies a standard shebang line of #!/usr/bin/env python3, so that python3 can be located by PATH lookup. In cases where python3 as found in the PATH is not correct, such as on systems that have multiple copies of python3 installed when building numpy for one that is not the python3 found by searching PATH, this interpreter will be wrong. When the python3 found by this mechanism doesn't have Cython available, it will cause the numpy build to fail. With the executable bit removed from tempita.py, meson will scan the script when attempting to execute it, locating the shebang line and substituting the appropriate sys.executable. See https://github.com/numpy/meson/blob/22df45a31981874310a78dde0df59a6a7c5ebb29/mesonbuild/programs.py#L179.
charris
added
08 - Backport
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Wouldn't it be more clear to explicitly use the target Python like Line 63 in 0b1484c |
That's a problem for cross-compiling; the shebang is the recommended approach by Meson. I'd like to get rid of the remaining |
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This is a backport PR, so I'll merge this. Happy to continue the conversation around |
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Backport of #24970.
When a program located by
find_programis executable directly, meson will execute it. If it is a script, its shebang (#!) line will control which interpreter is used.tempita.pyspecifies a standard shebang line of#!/usr/bin/env python3, so thatpython3can be located byPATHlookup.In cases where
python3as found in thePATHis not correct, such as on systems that have multiple copies ofpython3installed when building numpy for one that is not thepython3found by searchingPATH, this interpreter will be wrong. When thepython3found by this mechanism doesn't have Cython available, it will cause the numpy build to fail.With the executable bit removed from
tempita.py, meson will scan the script when attempting to execute it, locating the shebang line and substituting the appropriatesys.executable. See numpy/mesonprograms.py:179.