[c++] builtins, std::sin now recursive

[Benjamin Kosnik]

Jason. 

The following code is now failing.

extern "C" {
  extern double sin(double);
}

namespace std {
  inline double 
  sin(double __x) { return ::sin(__x); }
}

int main()
{
  std::sin(0);
  sin(0);
  return 0;
}

Note that this fails with -O2, -O, etc because ........ it gives a
infinitely recursive call:

	.file	"math-fail.cc"
	.version	"01.01"
gcc2_compiled.:
	.text
	.align 16
.globl main
	.type	main,@function
main:
.LFB1:
	pushl	%ebp
.LCFI0:
	movl	%esp, %ebp
.LCFI1:
	subl	$16, %esp
.LCFI2:
	pushl	$0
	pushl	$0
.LCFI3:
	call	sin  // should be inlined to ::sin
	fstp	%st(0)
	popl	%eax
	popl	%edx
	pushl	$0
	pushl	$0
	call	sin  // should be inlined to ::sin
	fstp	%st(0)
	xorl	%eax, %eax
	movl	%ebp, %esp
	popl	%ebp
	ret
.LFE1:
.Lfe1:
	.size	main,.Lfe1-main
	.section	.gnu.linkonce.t.sin,"ax",@progbits
	.align 16
	.weak	sin
	.type	sin,@function
sin:                                               // ::sin, should be std::sin
.LFB2:
	pushl	%ebp
.LCFI4:
	movl	%esp, %ebp
.LCFI5:
	subl	$8, %esp
.LCFI6:
	movl	%ebp, %esp
	popl	%ebp
.LCFI7:
	jmp	sin                              // ::sin
.LFE2:
.Lfe2:
	.size	sin,.Lfe2-sin
	.ident	"GCC: (GNU) 2.97 20001024 (experimental)"


Can you please look at this?

thanks,
benjamin