[Bug rtl-optimization/80318] GCC takes too much RAM and time compiling a template file (var-tracking)

[benjamin.redelings at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80318

benjamin.redelings at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|7.0.1                       |8.1.0

--- Comment #4 from benjamin.redelings at gmail dot com ---
It seems like the time and RAM usage for me is:

-g:
   5.3g / ~100s
-g -fno-var-tracking -fno-var-tracking-assignments:
   4.6g / ~80s
no -g:
   2.3g / 43s

So, while it is true that var-tracking is a problem, it is clearly not the
whole problem.  Also for clang we have:

clang -g:
   2.2g / 93s
clang no -g:
   1.2g / 42s   

So clang is not suffering from the RAM hogging problems, at least.

Any suggestions for a path forward on identifying (say) the second-largest
memory hog, after var-tracking?