[Bug libitm/61594] ICE (assertion failure) in trans-mem.c

["patrick.marlier at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61594

--- Comment #1 from Patrick Marlier <patrick.marlier at gmail dot com> ---
Created attachment 33058
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33058&action=edit
reduced testcase

$ xgcc -Wall -Wextra -Wfatal-errors -O2 -fgnu-tm -S pr61594.c
pr61594.c: In function ‘fn1’:
pr61594.c:12:40: internal compiler error: in requires_barrier, at
trans-mem.c:1517
 __attribute__((transaction_safe)) void fn1() { fn2(""); }
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From: "A.Finch at lancaster dot ac.uk" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/61674] The destructor of a simple class is removed by optimization
Date: Thu, 03 Jul 2014 09:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida674

--- Comment #6 from Alex Finch <A.Finch at lancaster dot ac.uk> ---

I guess I should have made that clear. The class has a static variable:
static int fLockCount;

which counts how many times an object of the class is created.
If it is >1, then IsLocked() returns true. The destructor has a line
 --fLockCount;
which is not executed if the destructor is not called. This breaks the program.
The destructor should not be optimised out precisely because it modifies the
static variable.