[Bug c++/86573] Failure to optimise passing simple values to inlined function

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86573 --- Comment #2 from Marc Glisse --- When passing by copy, gcc seems to manage with default flags, but your -std=c++2a -fno-exceptions hinder it somehow.

[Bug c++/86573] Failure to optimise passing simple values to inlined function

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86573 --- Comment #1 from Marc Glisse --- Try renaming 'main' to any other name and gcc does optimize...