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From: daniel@saturn.ucsc.edu (Daniel Edelson)
Newsgroups: comp.lang.c++
Subject: Possible cfront 1.1 bug
Keywords: float parameter passing bug
Message-ID: <6317@saturn.ucsc.edu>
Date: 10 Feb 89 20:14:13 GMT
Sender: daniel@saturn.ucsc.edu
Reply-To: daniel@saturn.ucsc.edu (Daniel Edelson)
Organization: University of California, Santa Cruz; CIS/CE
Lines: 42

There appears to be a bug in cfront 1.1 which causes this
program to print garbage in the third output. We've found three
ways of sidestepping the bug.

	1) replace all instances of float with double 
	2) use a local variable in foo(); pass the address of the local
	3) use the oregon C++ compiler

=-=-=-=-=-=-=-=-=-=
#include <stream.h>
void foo(float l);
void bar (float *lp);
main()
{
	float l=1.5;

	cout << "main: l == " << l << "\n";
	foo(l);
}

void foo(float l)
{
	cout << "foo: l == " << l << "\n";
	bar(&l);
}

void bar (float *lp)
{
	cout << "bar: *lp == " << *lp << "\n";
}
=-=-=-=-=-=-=-=-=-=
Rewriting the function foo() like this solves the problem.
-=-=-=-=-=-=-=-=-=-
foo(float l)
{
	float m=l;
	cout << "foo: m == " << m << "\n";
	bar(&m);
}
**************************************************************
Daniel Edelson
daniel@saturn.ucsc.edu