Kernel-doc requires at least version 3.6 to run, as it uses f-string.
Yet, Kernel build currently calls kernel-doc with -none on some places.
Better not to bail out when older versions are found.

Versions of Python prior to 3.7 do not guarantee to remember the insertion
order of dicts; since kernel-doc depends on that guarantee, running with
such older versions could result in output with reordered sections.

Check Python version when called via command line.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 scripts/kernel-doc.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/scripts/kernel-doc.py b/scripts/kernel-doc.py
index 12ae66f40bd7..fc3d46ef519f 100755
--- a/scripts/kernel-doc.py
+++ b/scripts/kernel-doc.py
@@ -271,6 +271,16 @@ def main():
 
     logger.addHandler(handler)
 
+    python_ver = sys.version_info[:2]
+    if python_ver < (3,6):
+        logger.warning("Python 3.6 or later is required by kernel-doc")
+
+        # Return 0 here to avoid breaking compilation
+        sys.exit(0)
+
+    if python_ver < (3,7):
+        logger.warning("Python 3.7 or later is required for correct results")
+
     if args.man:
         out_style = ManFormat(modulename=args.modulename)
     elif args.none:
-- 
2.50.0

Mauro Carvalho Chehab <mchehab+huawei@kernel.org> writes:

> Kernel-doc requires at least version 3.6 to run, as it uses f-string.
> Yet, Kernel build currently calls kernel-doc with -none on some places.
> Better not to bail out when older versions are found.
>
> Versions of Python prior to 3.7 do not guarantee to remember the insertion
> order of dicts; since kernel-doc depends on that guarantee, running with
> such older versions could result in output with reordered sections.
>
> Check Python version when called via command line.
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
> ---
>  scripts/kernel-doc.py | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/scripts/kernel-doc.py b/scripts/kernel-doc.py
> index 12ae66f40bd7..fc3d46ef519f 100755
> --- a/scripts/kernel-doc.py
> +++ b/scripts/kernel-doc.py
> @@ -271,6 +271,16 @@ def main():
>  
>      logger.addHandler(handler)
>  
> +    python_ver = sys.version_info[:2]
> +    if python_ver < (3,6):
> +        logger.warning("Python 3.6 or later is required by kernel-doc")

Does this really work on truly old Python versions?  I don't have an
easy way to try it, but I would expect things to fail with a syntax
error (due to the f-strings) at the import stage...?

Thanks,

jon