[Bug rtl-optimization/63191] [4.8/4.9/5 Regression] 32-bit gcc uses excessive memory during dead store elimination with -fPIC

[steven at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63191

--- Comment #4 from Steven Bosscher <steven at gcc dot gnu.org> ---
How is one to reproduce this bug with GCC5? I've tried:

$ ./xg++ --version
xg++ (GCC) 5.0.0 20150407 (experimental) [trunk revision 221906]
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ ./xg++ -B. -S -O2 -m32 -fPIC PR63191.cc -fdump-tree-optimized
$ cat PR63191.cc.190t.optimized

;; Function (static initializers for PR63191.cc) (_GLOBAL__sub_I_PR63191.cc,
funcdef_no=4, decl_uid=14028, cgraph_uid=4, symbol_order=1500) (executed once)

(static initializers for PR63191.cc) ()
{
  <bb 2>:
  return;

}


$ 

So AFAICT GCC5 optimizes the test case of comment #0 to an empty file.
I'm sure there's a way to avoid optimizing this to empty, but I'm not
quite a C++ guru ;-)