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Date: Thu, 27 Feb 2003 14:56:00 -0000
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Subject: c++/9878: [Regression 3.3/3.4] error: non-lvalue in unary `&' wrongly issued
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>Number:         9878
>Category:       c++
>Synopsis:       [Regression 3.3/3.4] error: non-lvalue in unary `&' wrongly issued
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Thu Feb 27 14:56:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Andreas Jaeger
>Release:        unknown-1.0
>Organization:
>Environment:
Linux x86 and x86-64, gcc 3.3 from 20030215 and GCC 3.4
from 20030215.
>Description:

This small C++ program:
void f(void)
{
  short x = 0;
  const int &y = x;
}

fails to compile with:
gee:~/tmp:[0]$  /opt/gcc/3.4-devel/bin/g++ -c t.C   
t.C: In function `void f()':
t.C:4: error: non-lvalue in unary `&'
gee:~/tmp:[1]$  /opt/gcc/3.3-devel/bin/g++ -c t.C 
t.C: In function `void f()':
t.C:4: error: non-lvalue in unary `&'

GCC 3.2 compiles this fine.

IMHO this is valid: according to 8.5.3[#5], the reference is bound to a temporary holding the value of np_ptr_F.  Replaceing short by double makes it compile (with two warnings).
>How-To-Repeat:
compile the small test program.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: