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<font color="#000000">Please read this thread from a month ago.</font><br>
<br>
<a
href="http://forum.world.st/Failed-to-build-FloatMathPlugin-on-FreeBSD-td3346374.html#a3346695">http://forum.world.st/Failed-to-build-FloatMathPlugin-on-FreeBSD-td3346374.html#a3346695</a><br>
<br>
Cheers,<br>
Henry<br>
<br>
On 10.04.2011 21:17, Mariano Martinez Peck wrote:
<blockquote
cite="mid:BANLkTim-YoOubx6XSTKGwMB4Qi46xgsA7g@mail.gmail.com"
type="cite">
<pre wrap=""> </pre>
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<div class="gmail_quote">On Sun, Apr 10, 2011 at 9:08 PM, Andreas
Raab <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:andreas.raab@gmx.de">andreas.raab@gmx.de</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
<br>
<div bgcolor="#ffffff" text="#000000"> On 4/10/2011 18:35,
Mariano Martinez Peck wrote:
<blockquote type="cite">Sorry for arriving late to the
thread. I have a simiar problem now trying to compile Cog
in a Windows box with MinGW. <br>
<br>
The problem is described in another thread: <a
moz-do-not-send="true"
href="http://forum.world.st/Cannot-generate-VM-in-Windows-with-CMake-and-Git-tp3434566p3434566.html"
target="_blank">http://forum.world.st/Cannot-generate-VM-in-Windows-with-CMake-and-Git-tp3434566p3434566.html</a><br>
<br>
So...if we remove "-mno-fused-madd" from windows confs
like CogMsWindowsConfig, then Corquet wouldn't behave
correctly ? but if we keep them, it is difficult to
compile in some platforms. So...I wonder, I am the only
one trying to compile this on Windows? Who do the Croquet
guys do to compile with this flag in Windows?<br>
</blockquote>
<br>
gcc 3.x accepts -mno-fused-madd fine.<br>
</div>
</blockquote>
<div><br>
Weird...I have<br>
<br>
$ gcc --version<br>
gcc.exe (GCC) 3.4.5 (mingw-vista special r3)<br>
Copyright (C) 2004 Free Software Foundation, Inc.<br>
This is free software; see the source for copying conditions.
There is NO<br>
warranty; not even fo<br>
<br>
and I have the error: <br>
<br>
<span>Scanning dependencies of target FloatMathPlugin</span><br>
<span>[ 13%] Building C object
FloatMathPlugin/CMakeFiles/FloatMathPlugin.dir/C_/maria
no/squeak/vm/cogVM/blessed/src/plugins/FloatMathPlugin/FloatMathPlugin.c.obj</span><br>
<span>
cc1.exe: error: invalid option `no-fused-madd'</span><br>
<span>make[2]: ***
[FloatMathPlugin/CMakeFiles/FloatMathPlugin.dir/C_/mariano/squeak/v
m/cogVM/blessed/src/plugins/FloatMathPlugin/FloatMathPlugin.c.obj]
Error 1</span><br>
<span>
make[1]: ***
[FloatMathPlugin/CMakeFiles/FloatMathPlugin.dir/all] Error 2</span><br>
<span>make: *** [all] Error 2</span><br>
r MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.<br>
<br>
<br>
Cheers<br>
<br>
mariano<br>
<br>
</div>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000"> <br>
Cheers,<br>
- Andreas<br>
<br>
<blockquote type="cite"> <br>
Thanks<br>
<br>
Mariano<br>
<br>
<div class="gmail_quote">On Tue, Jan 25, 2011 at 9:05 PM,
Nicolas Cellier <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:nicolas.cellier.aka.nice@gmail.com"
target="_blank">nicolas.cellier.aka.nice@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt
0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;"><br>
2011/1/25 Andreas Raab <<a moz-do-not-send="true"
href="mailto:andreas.raab@gmx.de" target="_blank">andreas.raab@gmx.de</a>>:<br>
<div>><br>
> On 1/25/2011 11:38 AM, Igor Stasenko wrote:<br>
>>><br>
>>> Squeak uses highly unportable flag
"-mno-fused-madd".<br>
>>> It isn't present in many systems, even
those using GCC,<br>
>>> since many systems use older compilers.<br>
>>><br>
>>> Also, why do you build fdlibm? It is
old stuff that works not so well,<br>
>>> we have better libm. Is there a way to
use our libm?<br>
>>><br>
>> I asked same question few weeks ago.<br>
>> Check mailing list archive for discussion.<br>
>> In short: differrent libm implementations
work differently and some<br>
>> have bad support of IEEE standard.<br>
><br>
> Actually, that's not quite the point. The issue
is that Croquet requires<br>
> bit-identical computations including floating
point. For FPU computations,<br>
> the use of -mno-fused-madd avoids the use of
the fused multiply-add<br>
> operation by compilers which support it which
would generate different<br>
> results from compilers not using fused madd.<br>
><br>
> The usage of fdlibm is similar. As Nicolas has
pointed out elsewhere, fdlibm<br>
> is in some cases actually inferior of the
platform libms (one might say<br>
> outright broken) but the requirement for the
usage in Croquet isn't really<br>
> whether it's "correct" or "good". The
requirement is bit-identical results<br>
> across all platforms. The results can be wrong
as long as they are<br>
> consistently wrong. But they mustn't be
different.<br>
><br>
<br>
</div>
Yes, I was disappointed by exp(1), but fdlibm
sin(pi+epsilon) is far<br>
far superior to i86 hardwired answer (i86
approximation of pi is well<br>
known to be poor).<br>
<font color="#888888"><br>
Nicolas<br>
</font>
<div>
<div><br>
> Having said that, for your regular Squeak VM
(i.e., not requiring<br>
> bit-identical floating point results) there
really isn't a requirement to<br>
> use either -mno-fused-madd or fdlibm.<br>
><br>
> Cheers,<br>
> - Andreas<br>
><br>
</div>
</div>
</blockquote>
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<br>
-- <br>
Mariano<br>
<a moz-do-not-send="true"
href="http://marianopeck.wordpress.com" target="_blank">http://marianopeck.wordpress.com</a><br>
<br>
</blockquote>
</div>
<br>
</blockquote>
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<br>
<br clear="all">
<br>
-- <br>
Mariano<br>
<a moz-do-not-send="true" href="http://marianopeck.wordpress.com"
target="_blank">http://marianopeck.wordpress.com</a><br>
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</blockquote>
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