[Bug bootstrap/16787] NAN constant "(0.0/0.0)" cannot be compiled by Tru64 cc

["scott dot bailey at eds dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From scott dot bailey at eds dot com  2004-07-29 14:02 -------
Subject: RE:  NAN constant "(0.0/0.0)" cannot be comp
	iled by Tru64 cc

>> However, my fear is that this patch isn't distributable since the header
>> file I'm borrowing the definitions from bears a Compaq Information
>> Technologies Group, L.P. copyright notice. :-(
>
>I do not think that matters. I mean, even if Compaq's math.h contains
>#define M_PI 3.14159265358979
>I am still allowed to use the same definition in my program.

I agree it's a fuzzy situation. They aren't actually defining a numerical
constant; instead they define DBL_QNAN in terms of a value referenced by an
external pointer that presumably is pointing to some hand-crafted "magic
bytes" :-) in their library. I had just literally copied the two lines
without thinking about it too much.

However, we may have a better answer at hand. I talked to their support team
this morning (case 3207169315) and they suggested adding "-ieee" to CFLAGS
for the bootstrap. On my little test program (abstracted from floatformat.c)
this works -- you get a warning about overflow (just like previous versions
of Tru64) instead of an error -- and the compile succeeds.

I am trying another rebuild to see if this approach works for the whole
compiler.

Fingers crossed,

	Scott


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16787