g++ 1.27 does not generate warning

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1 total messages Started by Tom Vijlbrief Wed, 18 Jan 1989 13:00

#1621

Author: Tom Vijlbrief
Date: Wed, 18 Jan 1989 13:00

64 lines
1610 bytes

G++ 1.27 does generate a warning when a reference to a
local automatic variable is returned, but NOT when a reference to an
expression is returned.



int &test1()
{
  int	a= 3;

  return a;	// Warning produced
}

int &test2()
{
  return 3;	// No warning produced !!!
}

===================================================
The generated code is identical for both functions:
===================================================

#NO_APP
.text
	.even
.globl _test1
_test1:
	link a6,#-4
	movel d2,sp@-
	moveq #3,d1
	movel d1,a6@(-4)
	movel a6,d2
	subql #4,d2
	movel d2,d0
	jra L1
L1:
	movel a6@(-8),d2
	unlk a6
	rts
	.even
.globl _test2
_test2:
	link a6,#-4
	movel d2,sp@-
	moveq #3,d1
	movel d1,a6@(-4)
	movel a6,d2
	subql #4,d2
	movel d2,d0
	jra L2
L2:
	movel a6@(-8),d2
	unlk a6
	rts
===================================

===============================================================================
Tom Vijlbrief
TNO Institute for Perception
P.O. Box 23				Phone: +31 34 63 62 77
3769 ZG  Soesterberg			E-mail: tnosoes!tom@mcvax.cwi.nl
The Netherlands				    or:	uunet!mcvax!tnosoes!tom
===============================================================================

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