c++/8228: ICE on HUGE_VAL in template code

[sebor at roguewave dot com]

>Number:         8228
>Category:       c++
>Synopsis:       ICE on HUGE_VAL in template code
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-legal-code
>Submitter-Id:   net
>Arrival-Date:   Mon Oct 14 19:06:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     sebor@roguewave.com
>Release:        3.2
>Organization:
>Environment:
Linux, glibc 2.1
>Description:
The program below causes an ICE with gcc 3.2:

$ cat t.cpp; g++ --version; g++ t.cpp
#include <math.h>

template <class T>
void foo ()
{
    if (HUGE_VAL == 0.0L);
}

int main ()
{
    foo<int>();
}

g++ (GCC) 3.2
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

t.cpp: In function `void foo() [with T = int]':
t.cpp:11:   instantiated from here
t.cpp:6: internal error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.

Preprocessed with this version of glibc, foo contains this:

template <class T>
void foo ()
{
    if ((__extension__ ((union { unsigned char __c[8]; double __d; }) { __c: { 0
, 0, 0, 0, 0, 0, 0xf0, 0x7f } }).__d) == 0.0L);
}
>How-To-Repeat:

>Fix:

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