[Bug c++/19661] unnecessary atexit calls emitted for static objects with empty destructors

["bangerth at dealii dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From bangerth at dealii dot org  2005-01-28 01:08 -------
Confirmed, although I consider this to be a rather minor point since 
the code is actually run only once. Here's a small test: 
-------------------- 
struct A { 
    A(); 
    ~A() {} 
}; 
 
void foo () { 
  static A a; 
} 
------------------------- 
 
g/x> /home/bangerth/bin/gcc-4.0-pre/bin/c++ -S -O3 x.cc 
g/x> cat x.s | c++filt > x.ss 
 
.... 
foo(): 
.LFB5: 
	pushl	%ebp 
.LCFI2: 
	movl	%esp, %ebp 
.LCFI3: 
	pushl	%ebx 
.LCFI4: 
	subl	$20, %esp 
.LCFI5: 
	cmpb	$0, guard variable for foo()::a 
	je	.L12 
.L9: 
	addl	$20, %esp 
	popl	%ebx 
	popl	%ebp 
	ret 
	.p2align 4,,7 
.L12: 
	movl	guard variable for foo()::a, (%esp) 
	call	__cxa_guard_acquire 
	testl	%eax, %eax 
	je	.L9 
	movl	foo()::a, (%esp) 
.LEHB0: 
	call	A::A() 
.LEHE0: 
	movl	guard variable for foo()::a, (%esp) 
	call	__cxa_guard_release 
	movl	$__tcf_0, (%esp) 
	call	atexit 
	addl	$20, %esp 
	popl	%ebx 
	popl	%ebp 
	ret 
... 
 
W. 

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2005-01-28 01:08:27
               date|                            |
            Summary|many redundant atexit calls |unnecessary atexit calls
                   |emitted into the executable |emitted for static objects
                   |for static objects with     |with empty destructors
                   |empty destructors           |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19661