[Bug c++/117516] New: [12/13/14/15 Regression] compile time hog figuring out has flexarrays

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117516

            Bug ID: 117516
           Summary: [12/13/14/15 Regression] compile time hog figuring out
                    has flexarrays
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Keywords: compile-time-hog
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Created attachment 59571
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59571&action=edit
shell script to create structs referencing other structs

Take the attached shell script to create simple structs.
The more structs inside structs you have create a quadratic compile time
increase.

forward from:
https://hachyderm.io/@feedable@im-in.space/113409161672076847


[apinski@xeond2 upstream-gcc-isel]$ time g++ t24.c

real    0m2.121s
user    0m2.059s
sys     0m0.019s


[apinski@xeond2 upstream-gcc-isel]$ time g++ t22.c

real    0m0.601s
user    0m0.555s
sys     0m0.021s

This started with r6-5791-g7e9a3ad30076ad .