https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107351

--- Comment #4 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
Attached the build log.

I completely forgot about the fact that I was using gcc source from
"normalized" filesystem which intentionally resets all timestamps (it's one of
the build modes for my distribution to validate build determinism):

$ LANG=C ls -l
/nix/store/p2m8xz3klafr1ydbjf8g86vmylziscr3-source/gcc/cp/module.cc
-r--r--r-- 4 root root 533735 Jan  1  1970
/nix/store/p2m8xz3klafr1ydbjf8g86vmylziscr3-source/gcc/cp/module.cc

Silly question: would it be reasonable for module.cc to use
gcc/{BASE-VER,DATESTAMP}?

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