linux-kernel - Re: [PATCH 2/2] docs: Makefile: avoid a warning when using without texlive

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Message-ID: <097971a6-9a19-4618-ac96-070fcb3ff4bd@infradead.org>
Date: Fri, 26 Sep 2025 12:41:12 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
 Jonathan Corbet <corbet@....net>,
 Linux Doc Mailing List <linux-doc@...r.kernel.org>
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] docs: Makefile: avoid a warning when using without
 texlive



On 9/26/25 3:16 AM, Mauro Carvalho Chehab wrote:
> As reported by Randy, running make htmldocs on a machine
> without textlive now produce warnings:
> 
>      $ make O=DOCS htmldocs
>      ../Documentation/Makefile:70: warning: overriding recipe for target 'pdfdocs'
>      ../Documentation/Makefile:61: warning: ignoring old recipe for target 'pdfdocs'
> 
> That's because the code has now two definitions for pdfdocs in
> case $PDFLATEX command is not found. With the new script, such
> special case is not needed anymore, as the script checks it.
> 
> Drop the special case. Even after dropping it, on a machine
> without LaTeX, it will still produce an error as expected,
> as running:
> 
>      $ ./tools/docs/sphinx-build-wrapper pdfdocs
>      Error: pdflatex or latexmk required for PDF generation
> 
> does the check. After applying the patch we have:
> 
>      $ make SPHINXDIRS=peci htmldocs
>      Using alabaster theme
>      Using Python kernel-doc
> 
>      $ make SPHINXDIRS=peci pdfdocs
>      Error: pdflatex or latexmk required for PDF generation
>      make[2]: *** [Documentation/Makefile:64: pdfdocs] Error 1
>      make[1]: *** [/root/Makefile:1808: pdfdocs] Error 2
>      make: *** [Makefile:248: __sub-make] Error 2
> 
> Which is the expected behavior.
> 
> Reported-by: Randy Dunlap <rdunlap@...radead.org>
> Link: https://lore.kernel.org/linux-doc/e7c29532-71de-496b-a89f-743cef28736e@infradead.org/

s/Link/Closes/

> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>

Acked-by: Randy Dunlap <rdunlap@...radead.org>
Tested-by: Randy Dunlap <rdunlap@...radead.org>

Thanks.

> ---
>   Documentation/Makefile | 13 ++++---------
>   1 file changed, 4 insertions(+), 9 deletions(-)
> 
> diff --git a/Documentation/Makefile b/Documentation/Makefile
> index c60db1038c9c..f764604fa1ac 100644
> --- a/Documentation/Makefile
> +++ b/Documentation/Makefile
> @@ -66,20 +66,15 @@ htmldocs mandocs infodocs texinfodocs latexdocs epubdocs xmldocs pdfdocs linkche
>   		--builddir="$(BUILDDIR)" --deny-vf=$(FONTS_CONF_DENY_VF) \
>   		--theme=$(DOCS_THEME) --css=$(DOCS_CSS) --paper=$(PAPER)
>   
> -# Special handling for pdfdocs
> -ifneq ($(shell which $(PDFLATEX) >/dev/null 2>&1; echo $$?),0)
> -pdfdocs:
> -	$(warning The '$(PDFLATEX)' command was not found. Make sure you have it installed and in PATH to produce PDF output.)
> -	@echo "  SKIP    Sphinx $@ target."
> -endif
>   
> -htmldocs-redirects: $(srctree)/Documentation/.renames.txt
> -	@tools/docs/gen-redirects.py --output $(BUILDDIR) < $<
> -endif # HAVE_SPHINX
> +endif
>   
>   # The following targets are independent of HAVE_SPHINX, and the rules should
>   # work or silently pass without Sphinx.
>   
> +htmldocs-redirects: $(srctree)/Documentation/.renames.txt
> +	@tools/docs/gen-redirects.py --output $(BUILDDIR) < $<
> +
>   refcheckdocs:
>   	$(Q)cd $(srctree);scripts/documentation-file-ref-check
>   

-- 
~Randy