Re: [PATCH v2 1/2] scripts/kernel-doc.py: don't create *.pyc files

[Jani Nikula <jani.nikula@linux.intel.com>]

On Wed, 16 Apr 2025, Jani Nikula <jani.nikula@linux.intel.com> wrote:
> On Wed, 16 Apr 2025, Mauro Carvalho Chehab <mchehab+huawei@kernel.org> wrote:
>> As reported by Andy, kernel-doc.py is creating a __pycache__
>> directory at build time.
>>
>> Disable creation of __pycache__ for the libraries used by
>> kernel-doc.py, when excecuted via the build system or via
>> scripts/find-unused-docs.sh.
>>
>> Reported-by: Andy Shevchenko <andriy.shevchenko@intel.com>
>> Closes: https://lore.kernel.org/linux-doc/Z_zYXAJcTD-c3xTe@black.fi.intel.com/
>> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
>> ---
>>  drivers/gpu/drm/Makefile      | 2 +-
>>  drivers/gpu/drm/i915/Makefile | 2 +-
>>  include/drm/Makefile          | 2 +-
>>  scripts/find-unused-docs.sh   | 2 +-
>>  4 files changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
>> index ed54a546bbe2..1469d64f8783 100644
>> --- a/drivers/gpu/drm/Makefile
>> +++ b/drivers/gpu/drm/Makefile
>> @@ -236,7 +236,7 @@ always-$(CONFIG_DRM_HEADER_TEST) += \
>>  quiet_cmd_hdrtest = HDRTEST $(patsubst %.hdrtest,%.h,$@)
>>        cmd_hdrtest = \
>>  		$(CC) $(c_flags) -fsyntax-only -x c /dev/null -include $< -include $<; \
>> -		$(srctree)/scripts/kernel-doc -none $(if $(CONFIG_WERROR)$(CONFIG_DRM_WERROR),-Werror) $<; \
>> +		$(KERNELDOC) PYTHONDONTWRITEBYTECODE=1 -none $(if $(CONFIG_WERROR)$(CONFIG_DRM_WERROR),-Werror) $<; \
>
> It doesn't work to put PYTHONDONTWRITEBYTECODE=1 as a parameter to
> kernel-doc...

Moreover, KERNELDOC is only defined in Documentation/Makefile. It's
empty here.

Also scripts/Makefile.build uses kernel-doc, which is probably the one
creating __pycache__ Andy sees.

>
> BR,
> Jani.
>
>
>>  		touch $@
>>  
>>  $(obj)/%.hdrtest: $(src)/%.h FORCE
>> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
>> index ed05b131ed3a..bb873f9cc2aa 100644
>> --- a/drivers/gpu/drm/i915/Makefile
>> +++ b/drivers/gpu/drm/i915/Makefile
>> @@ -408,7 +408,7 @@ obj-$(CONFIG_DRM_I915_GVT_KVMGT) += kvmgt.o
>>  #
>>  # Enable locally for CONFIG_DRM_I915_WERROR=y. See also scripts/Makefile.build
>>  ifdef CONFIG_DRM_I915_WERROR
>> -    cmd_checkdoc = $(srctree)/scripts/kernel-doc -none -Werror $<
>> +    cmd_checkdoc = $(KERNELDOC) PYTHONDONTWRITEBYTECODE=1 -none -Werror $<
>>  endif
>>  
>>  # header test
>> diff --git a/include/drm/Makefile b/include/drm/Makefile
>> index a7bd15d2803e..6088ea458f44 100644
>> --- a/include/drm/Makefile
>> +++ b/include/drm/Makefile
>> @@ -11,7 +11,7 @@ always-$(CONFIG_DRM_HEADER_TEST) += \
>>  quiet_cmd_hdrtest = HDRTEST $(patsubst %.hdrtest,%.h,$@)
>>        cmd_hdrtest = \
>>  		$(CC) $(c_flags) -fsyntax-only -x c /dev/null -include $< -include $<; \
>> -		$(srctree)/scripts/kernel-doc -none $(if $(CONFIG_WERROR)$(CONFIG_DRM_WERROR),-Werror) $<; \
>> +		$(KERNELDOC) PYTHONDONTWRITEBYTECODE=1 -none $(if $(CONFIG_WERROR)$(CONFIG_DRM_WERROR),-Werror) $<; \
>>  		touch $@
>>  
>>  $(obj)/%.hdrtest: $(src)/%.h FORCE
>> diff --git a/scripts/find-unused-docs.sh b/scripts/find-unused-docs.sh
>> index ee6a50e33aba..d6d397fbf917 100755
>> --- a/scripts/find-unused-docs.sh
>> +++ b/scripts/find-unused-docs.sh
>> @@ -54,7 +54,7 @@ for file in `find $1 -name '*.c'`; do
>>  	if [[ ${FILES_INCLUDED[$file]+_} ]]; then
>>  	continue;
>>  	fi
>> -	str=$(scripts/kernel-doc -export "$file" 2>/dev/null)
>> +	str=$(PYTHONDONTWRITEBYTECODE=1 scripts/kernel-doc -export "$file" 2>/dev/null)
>>  	if [[ -n "$str" ]]; then
>>  	echo "$file"
>>  	fi

-- 
Jani Nikula, Intel