Python 3.7+: setlocale: LC_ALL: cannot change locale (C.UTF-8) from build/bin/sage-spkg and in doctests; disable use of system Python 3.6

[dimpase]

In #29033 in build/bin/sage-spkg LC_ALL was changed to C.UTF-8
However, not all systems have it.

See also:

• Set LC_ALL=C to build PDF docs #22659

Follow-up:

• After #30053, sphinx 3.1.2 does not build on ubuntu-{trusty,xenial,bionic}, debian-jessie, centos-7 (again) #30008 Fix sage-system-python
• macOS: Doctest failures in some locales #30586 macOS: Doctest failures in some locales
• Python 3.6: Fix locale/encoding issues in docbuild, then re-enable Python 3.6 #30576 Python 3.6: Fix locale/encoding issues, then re-enable Python 3.6

CC: @antonio-rojas @mkoeppe @slel @orlitzky @kiwifb @embray @fchapoton

Component: build

Author: Dima Pasechnik, Matthias Koeppe

Branch: be47518

Reviewer: Matthias Koeppe, Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/30053

[dimpase]

comment:3

an easy way out is just to check whether the locale change worked, and if not, use C locale, not C.UTF-8. Perhaps print a warning.

[mkoeppe]

comment:5

Replying to @dimpase:

an easy way out is just to check whether the locale change worked, and if not, use C locale, not C.UTF-8.

+1

[dimpase]

Author: Dima Pasechnik

[dimpase]

Commit: 37e042c

[dimpase]

New commits:

37e042c

only use locale C.UTF-8 if available, else C

[dimpase]

Branch: u/dimpase/build/careful_with_C_UTF8

[kliem]

comment:7

Either this ticket is a duplicate of #30008 or it should make #30008 obsolete.

[kliem]

comment:8

I started test runs:

https://github.com/kliem/sage/pull/20/checks

[dimpase]

comment:9

this ticket was a result of a bug report on Arch, not centos. Hopefully it works for #30008 too.

[kliem]

comment:10

Tests did not complete, because the 9.2.beta3 tests fail everywhere.

https://github.com/sagemath/sage/actions/runs/157607524

Is this a github issue or have we broken sage?

 Step 13/18 : RUN ./bootstrap
 ---> Running in 89427ef5c1c4
rm -rf config configure build/make/Makefile-auto.in
rm -f src/doc/en/installation/*.txt
rm -rf src/doc/en/reference/spkg/*.rst
rm -f src/doc/en/reference/repl/*.txt
src/doc/bootstrap:48: installing src/doc/en/installation/arch.txt and src/doc/en/installation/arch-optional.txt
src/doc/bootstrap:48: installing src/doc/en/installation/debian.txt and src/doc/en/installation/debian-optional.txt
src/doc/bootstrap:48: installing src/doc/en/installation/fedora.txt and src/doc/en/installation/fedora-optional.txt
src/doc/bootstrap:48: installing src/doc/en/installation/cygwin.txt and src/doc/en/installation/cygwin-optional.txt
src/doc/bootstrap:48: installing src/doc/en/installation/homebrew.txt and src/doc/en/installation/homebrew-optional.txt
src/doc/bootstrap:55: installing src/doc/en/reference/spkg/*.rst
src/doc/bootstrap:83: installing src/doc/en/reference/repl/options.txt
src/doc/bootstrap: line 84: src/doc/en/reference/repl/options.txt: No such file or directory
The command '/bin/sh -c ./bootstrap' returned a non-zero code: 1