[Bug lto/83967] LTO removes C functions declared as weak in assembler(depending on files order in linking)

[hurwic8 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83967

--- Comment #4 from Rafał Mszal <hurwic8 at gmail dot com> ---
Created attachment 43210
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43210&action=edit
Basic example of main funtion with LTO failure.

This is simple example of observed LTO issue. RTC1_IRQHandler is removed
despite it is used to change volatile variable. RTC1_IRQHandler is defined weak
in the assembler startup file.