[C++] Avoid one place of frontend calling into targetm

[David Edelsohn]

>>>>> Jan Hubicka writes:

Jan> Looks like C++ frontend is keeping DECL_STATIC_CONSTRUCTOR on bit too
Jan> many functions, but I am not at all sure why.  Would be possible to have
Jan> a testcase + diff of what is going wrong so I can throw it into a cross?

	The testcase is g++.dg/init/copy3.C:

// { dg-do run }
// { dg-options "-fno-elide-constructors" }

int copies;

struct S { 
  S () {}
  S (const S&) { ++copies; }
};

S s[1] = { S () };

int main () {
  if (copies != 1)
    return 1;
}


and the diff of the assembly output is:

--- copy3.s.bad	Sat May  5 22:20:26 2007
+++ copy3.s	Sat May  5 22:20:23 2007
@@ -212,40 +212,6 @@
 	.byte 31
 	.align 2
 LFE..10:
-	.align 2
-	.globl _GLOBAL__I_0_copies
-	.globl ._GLOBAL__I_0_copies
-	.csect _GLOBAL__I_0_copies[DS]
-_GLOBAL__I_0_copies:
-	.long ._GLOBAL__I_0_copies, TOC[tc0], 0
-	.csect .text[PR]
-._GLOBAL__I_0_copies:
-LFB..11:
-	mflr 0
-LCFI..20:
-	stw 31,-4(1)
-LCFI..21:
-	stw 0,8(1)
-LCFI..22:
-	stwu 1,-64(1)
-LCFI..23:
-	mr 31,1
-LCFI..24:
-	bl ._GLOBAL__I_copies
-	lwz 1,0(1)
-	lwz 0,8(1)
-	mtlr 0
-	lwz 31,-4(1)
-	blr
-LT.._GLOBAL__I_0_copies:
-	.long 0
-	.byte 0,9,32,97,128,1,0,1
-	.long LT.._GLOBAL__I_0_copies-._GLOBAL__I_0_copies
-	.short 19
-	.byte "_GLOBAL__I_0_copies"
-	.byte 31
-	.align 2
-LFE..11:
 	.globl copies
 	.csect .data[RW],3
 	.align 2

In other words, the entire, extraneous function _GLOBAL__I_0_copies.

David