[sr #111048] Add a syntax check to code snippets

Follow-up Comment #3, sr #111048 (group autoconf):

I agree, it's not so easy.

On CMake side, I think they are considering adding an "escape hatch" that
would not go unnoticed either.

For Autoconf, maybe we could add a separate macro (with a very explicit name)
for syntax checks like "case 0 ... 5".  A malicious contributor would have a
harder time explaining why they would create a syntax check for checking the
availability of a system feature like landlock, as was the case with XZ
Utils.
https://www.man7.org/linux/man-pages/man7/landlock.7.html

My 2 cents...


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