[4.0.x] Fixed #33753 -- Fixed docs build on Sphinx 5+.

Empty language is not supported anymore.
Backport of 565ad5ace4 from main
This commit is contained in:
Mariusz Felisiak 2022-06-01 12:13:15 +02:00
parent 067daffb95
commit bc38eafc61
1 changed files with 5 additions and 0 deletions

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@ -9,6 +9,11 @@ PAPER ?=
BUILDDIR ?= _build
LANGUAGE ?=
# Set the default language.
ifndef LANGUAGE
override LANGUAGE = en
endif
# Convert something like "en_US" to "en", because Sphinx does not recognize
# underscores. Country codes should be passed using a dash, e.g. "pt-BR".
LANGUAGEOPT = $(firstword $(subst _, ,$(LANGUAGE)))