[Bug d/103728] Allow to run unittests before main()

[pierrick.bouvier at posteo dot net via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103728

--- Comment #4 from Pierrick Bouvier <pierrick.bouvier at posteo dot net> ---
Thanks for your suggestion.

We will follow this to upgrade our compiler.