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build: try “python3” as a last resort for 3.x #35983

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build: try “python3” as a last resort for 3.x #35983

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Expand Up @@ -10,6 +10,7 @@ command -v python3.8 >/dev/null && exec python3.8 "$0" "$@"
command -v python3.7 >/dev/null && exec python3.7 "$0" "$@"
command -v python3.6 >/dev/null && exec python3.6 "$0" "$@"
command -v python3.5 >/dev/null && exec python3.5 "$0" "$@"
command -v python3 >/dev/null && exec python3 "$0" "$@"
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@cclauss Would this be acceptable?

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command -v python3 >/dev/null && exec python3 "$0" "$@"
command -v python3 >/dev/null && python3 -c 'import sys; assert sys.version_info >= (3,5)' > /dev/null && exec python3 "$0" "$@"

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Although I guess I kind of wonder if this actually covers anything we don't already cover.

@oleavr It would be very useful to know the output of python3 --version on your system (assuming this PR is a bug fix for your own setup).

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We could also just print a warning from configure.py itself, right? We’re already doing that for a the compiler/assembler/etc. versions as well

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@oleavr oleavr Nov 14, 2020 •
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@Trott The output is:

% python3 --version
Python 3.8.2

This is the Xcode-provided Python 3 on a macOS system. Xcode doesn't create a python-3.8 symlink in /usr/bin, there's only /usr/bin/python3 (which is not a symlink, but a magic forwarder program that locates the Xcode installation and pivots to the appropriate binary there).

command -v python2.7 >/dev/null && exec python2.7 "$0" "$@"
exec python "$0" "$@"
''' "$0" "$@"
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