bug#720: Patch to fix CVS Emacs compilation error on Windows XP SP2.

bug#720: Patch to fix CVS Emacs compilation error on Windows XP SP2.

[Francis Litterio]

When building CVS Emacs on Windows XP SP2 using Visual Studio 6.0, the
following patch is needed to prevent the compiler from displaying an
error about unsigned __int64 not being convertable to double.
--
Fran


--- w32.c~	2008-08-11 13:51:58.372421800 -0400
+++ w32.c	2008-08-14 12:54:29.192936600 -0400
@@ -3817,7 +3817,7 @@
                  attrs);
 
   if (global_memory_status_ex (&memstex))
-    totphys = memstex.ullTotalPhys / 1024.0;
+    totphys = (signed __int64)memstex.ullTotalPhys / 1024.0;
   else if (global_memory_status (&memst))
     totphys = memst.dwTotalPhys / 1024.0;
 

bug#720: Patch to fix CVS Emacs compilation error on Windows XP SP2.

[Eli Zaretskii]

> Date: Thu, 14 Aug 2008 12:57:56 -0400
> From: Francis Litterio <flitterio@gmail.com>
> Cc: 
> 
> When building CVS Emacs on Windows XP SP2 using Visual Studio 6.0, the
> following patch is needed to prevent the compiler from displaying an
> error about unsigned __int64 not being convertable to double.

Thank you for your report.  Can you show the error text?

> -    totphys = memstex.ullTotalPhys / 1024.0;
> +    totphys = (signed __int64)memstex.ullTotalPhys / 1024.0;

Does it help to use 1024.0L here instead of just 1024.0?

bug#720: Patch to fix CVS Emacs compilation error on Windows XP SP2.

[Stefan Monnier]

> When building CVS Emacs on Windows XP SP2 using Visual Studio 6.0, the
> following patch is needed to prevent the compiler from displaying an
> error about unsigned __int64 not being convertable to double.

Wouldn't it be better to cast to (double) ?


        Stefan

bug#720: Patch to fix CVS Emacs compilation error on Windows XP SP2.

[Francis Litterio]

Eli Zaretskii wrote:

>> From: Francis Litterio
>> 
>> When building CVS Emacs on Windows XP SP2 using Visual Studio 6.0, the
>> following patch is needed to prevent the compiler from displaying an
>> error about unsigned __int64 not being convertable to double.
>
> Thank you for your report.  Can you show the error text?

Sorry for omitting that.  The error was:

	w32.c(3820) : error C2520: conversion from unsigned __int64 to double not implemented, use signed __int64

>> -    totphys = memstex.ullTotalPhys / 1024.0;
>> +    totphys = (signed __int64)memstex.ullTotalPhys / 1024.0;
>
> Does it help to use 1024.0L here instead of just 1024.0?

Nope.  Same error.

Else-thread, Stefan Monnier asked:

> Wouldn't it be better to cast to (double) ?

That doesn't help either.  Each of these variations causes the same error:

	    totphys = (double)(memstex.ullTotalPhys / 1024.0);

	    totphys = memstex.ullTotalPhys / (double)1024.0;

	    totphys = (double)memstex.ullTotalPhys / 1024.0L;

	    totphys = (double)memstex.ullTotalPhys / (double)1024.0;
--
Fran

bug#720: Patch to fix CVS Emacs compilation error on Windows XP SP2.

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Thu, 14 Aug 2008 15:54:44 -0400
> Cc: bug-gnu-emacs@gnu.org, 720@emacsbugs.donarmstrong.com
> 
> > When building CVS Emacs on Windows XP SP2 using Visual Studio 6.0, the
> > following patch is needed to prevent the compiler from displaying an
> > error about unsigned __int64 not being convertable to double.
> 
> Wouldn't it be better to cast to (double) ?

Wouldn't that be doing the same mistake?  The compiler probably has a
point: an unsigned 64-bit number has more bits than a simple double
can handle.

bug#720: Patch to fix CVS Emacs compilation error on Windows XP SP2.

[Eli Zaretskii]

> Cc: 720@emacsbugs.donarmstrong.com, bug-gnu-emacs@gnu.org,
>         Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Thu, 14 Aug 2008 16:15:04 -0400
> From: Francis Litterio <flitterio@gmail.com>
> 
> 	w32.c(3820) : error C2520: conversion from unsigned __int64 to double not implemented, use signed __int64

"Not implemented"?  I'm not sure we want to support such a deficient
compiler.  How about this:

  DWORD tot_hi = memstex.ullTotalPhys >> 32;
  DWORD tot_md = (memstex.ullTotalPhys & 0x00000000ffffffffLL) >> 10;
  DWORD tot_lo = memstex.ullTotalPhys % 1024LL;
  totphys = tot_hi * 4194304.0 + tot_md + tot_lo / 1024.0;

Does this work?

bug#720: Patch to fix CVS Emacs compilation error on Windows XP SP2.

[Francis Litterio]

Eli Zaretskii wrote:

>> From: Francis Litterio
>> 
>> 	w32.c(3820) : error C2520: conversion from unsigned __int64 to double not implemented, use signed __int64
>
> "Not implemented"?  I'm not sure we want to support such a deficient
> compiler.

I would happily use a newer compiler.  The file emacs/nt/INSTALL says
this:

   To compile Emacs, you will need either Microsoft Visual C++ 2.0, or
   later up to 7.0, and nmake

I didn't realize that I could use a version of VC++ newer than 6.0.  I
would be happy to abandon 6.0 for building Emacs on Windows.  Is VC++
7.0 the compiler that comes with Visual Studio 2003?

What compiler do the Emacs developers use to build on Windows?

> How about this:
>
>   DWORD tot_hi = memstex.ullTotalPhys >> 32;
>   DWORD tot_md = (memstex.ullTotalPhys & 0x00000000ffffffffLL) >> 10;
>   DWORD tot_lo = memstex.ullTotalPhys % 1024LL;
>   totphys = tot_hi * 4194304.0 + tot_md + tot_lo / 1024.0;
>
> Does this work?

Nope:

  w32.c(3823) : error C2059: syntax error : 'bad suffix on number'
  w32.c(3823) : error C2146: syntax error : missing ')' before identifier 'L'
  w32.c(3823) : error C2059: syntax error : ')'
  w32.c(3824) : error C2059: syntax error : 'bad suffix on number'
  w32.c(3824) : error C2146: syntax error : missing ';' before identifier 'L'
  w32.c(3824) : error C2065: 'L' : undeclared identifier

Here's the relevant code with line numbers:

  3819	  if (global_memory_status_ex (&memstex))
  3820	#if 1
  3821	  {
  3822	    DWORD tot_hi = memstex.ullTotalPhys >> 32;
  3823	    DWORD tot_md = (memstex.ullTotalPhys & 0x00000000ffffffffLL) >> 10;
  3824	    DWORD tot_lo = memstex.ullTotalPhys % 1024LL;
  3825	    totphys = tot_hi * 4194304.0 + tot_md + tot_lo / 1024.0;
  3826	  }
  3827	#else
  3828	    totphys = (signed __int64)memstex.ullTotalPhys / 1024.0;
  3829	#endif

--
Fran

bug#720: Patch to fix CVS Emacs compilation error on Windows XP SP2.

[Eli Zaretskii]

> Date: Fri, 15 Aug 2008 09:22:31 -0400
> From: Francis Litterio <flitterio@gmail.com>
> 
> Eli Zaretskii wrote:
> 
> >> From: Francis Litterio
> >> 
> >> 	w32.c(3820) : error C2520: conversion from unsigned __int64 to double not implemented, use signed __int64
> >
> > "Not implemented"?  I'm not sure we want to support such a deficient
> > compiler.
> 
> I would happily use a newer compiler.  The file emacs/nt/INSTALL says
> this:
> 
>    To compile Emacs, you will need either Microsoft Visual C++ 2.0, or
>    later up to 7.0, and nmake
> 
> I didn't realize that I could use a version of VC++ newer than 6.0.  I
> would be happy to abandon 6.0 for building Emacs on Windows.  Is VC++
> 7.0 the compiler that comes with Visual Studio 2003?

Yes.

> What compiler do the Emacs developers use to build on Windows?

The MinGW port of GCC.

> > How about this:
> >
> >   DWORD tot_hi = memstex.ullTotalPhys >> 32;
> >   DWORD tot_md = (memstex.ullTotalPhys & 0x00000000ffffffffLL) >> 10;
> >   DWORD tot_lo = memstex.ullTotalPhys % 1024LL;
> >   totphys = tot_hi * 4194304.0 + tot_md + tot_lo / 1024.0;
> >
> > Does this work?
> 
> Nope:
> 
>   w32.c(3823) : error C2059: syntax error : 'bad suffix on number'
>   w32.c(3823) : error C2146: syntax error : missing ')' before identifier 'L'
>   w32.c(3823) : error C2059: syntax error : ')'
>   w32.c(3824) : error C2059: syntax error : 'bad suffix on number'
>   w32.c(3824) : error C2146: syntax error : missing ';' before identifier 'L'
>   w32.c(3824) : error C2065: 'L' : undeclared identifier

Does it mean that the LL suffix is not supported in VS 6?  Can you try
the same without the 2 LL suffixes?

bug#720: Patch to fix CVS Emacs compilation error on Windows XP SP2.

[Fran Litterio]

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On Fri, Aug 15, 2008 at 12:15 PM, Eli Zaretskii <eliz@gnu.org> wrote:

> > > How about this:
> > >
> > >   DWORD tot_hi = memstex.ullTotalPhys >> 32;
> > >   DWORD tot_md = (memstex.ullTotalPhys & 0x00000000ffffffffLL) >> 10;
> > >   DWORD tot_lo = memstex.ullTotalPhys % 1024LL;
> > >   totphys = tot_hi * 4194304.0 + tot_md + tot_lo / 1024.0;
> > >
> > > Does this work?
> >
> > Nope:
> >
> >   w32.c(3823) : error C2059: syntax error : 'bad suffix on number'
> >   w32.c(3823) : error C2146: syntax error : missing ')' before identifier
> 'L'
> >   w32.c(3823) : error C2059: syntax error : ')'
> >   w32.c(3824) : error C2059: syntax error : 'bad suffix on number'
> >   w32.c(3824) : error C2146: syntax error : missing ';' before identifier
> 'L'
> >   w32.c(3824) : error C2065: 'L' : undeclared identifier
>
> Does it mean that the LL suffix is not supported in VS 6?


I think so.


> Can you try
> the same without the 2 LL suffixes?
>

Yes, omitting the LL suffixes compiles with VS 6, though with several of
these warnings:

   warning C4244: '=' : conversion from 'long double ' to 'long ', possible
loss of data
--
Fran

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bug#720: Patch to fix CVS Emacs compilation error on Windows XP SP2.

[Eli Zaretskii]

> Date: Fri, 15 Aug 2008 13:11:45 -0400
> From: "Fran Litterio" <flitterio@gmail.com>
> Cc: 720@emacsbugs.donarmstrong.com
> 
> > >   w32.c(3823) : error C2059: syntax error : 'bad suffix on number'
> > >   w32.c(3823) : error C2146: syntax error : missing ')' before identifier
> > 'L'
> > >   w32.c(3823) : error C2059: syntax error : ')'
> > >   w32.c(3824) : error C2059: syntax error : 'bad suffix on number'
> > >   w32.c(3824) : error C2146: syntax error : missing ';' before identifier
> > 'L'
> > >   w32.c(3824) : error C2065: 'L' : undeclared identifier
> >
> > Does it mean that the LL suffix is not supported in VS 6?
> 
> 
> I think so.
> 
> 
> > Can you try
> > the same without the 2 LL suffixes?
> >
> 
> Yes, omitting the LL suffixes compiles with VS 6, though with several of
> these warnings:
> 
>    warning C4244: '=' : conversion from 'long double ' to 'long ', possible
> loss of data

Thanks, I installed the version without LL suffixes.

bug#720: marked as done (Patch to fix CVS Emacs compilation error on Windows XP SP2.)

[Emacs bug Tracking System]

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with message-id <uskt6dvo2.fsf@gnu.org>
and subject line Bug fixed
has caused the Emacs bug report #720,
regarding Patch to fix CVS Emacs compilation error on Windows XP SP2.
to be marked as done.

This means that you claim that the problem has been dealt with.
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-- 
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Emacs Bug Tracking System
Contact don@donarmstrong.com with problems

[-- Attachment #2: Type: message/rfc822, Size: 2891 bytes --]

From: Francis Litterio <flitterio@gmail.com>
To: bug-gnu-emacs@gnu.org
Subject: Patch to fix CVS Emacs compilation error on Windows XP SP2.
Date: Thu, 14 Aug 2008 12:57:56 -0400
Message-ID: <u3al78rai.fsf@gmail.com>

When building CVS Emacs on Windows XP SP2 using Visual Studio 6.0, the
following patch is needed to prevent the compiler from displaying an
error about unsigned __int64 not being convertable to double.
--
Fran


--- w32.c~	2008-08-11 13:51:58.372421800 -0400
+++ w32.c	2008-08-14 12:54:29.192936600 -0400
@@ -3817,7 +3817,7 @@
                  attrs);
 
   if (global_memory_status_ex (&memstex))
-    totphys = memstex.ullTotalPhys / 1024.0;
+    totphys = (signed __int64)memstex.ullTotalPhys / 1024.0;
   else if (global_memory_status (&memst))
     totphys = memst.dwTotalPhys / 1024.0;
 




[-- Attachment #3: Type: message/rfc822, Size: 1025 bytes --]

From: Eli Zaretskii <eliz@gnu.org>
To: 720-done@emacsbugs.donarmstrong.com
Subject: Bug fixed
Date: Fri, 15 Aug 2008 20:39:57 +0300
Message-ID: <uskt6dvo2.fsf@gnu.org>

This bug is fixed.

bug#720: Patch to fix CVS Emacs compilation error on Windows XP SP2.

[Stefan Monnier]

>> > When building CVS Emacs on Windows XP SP2 using Visual Studio 6.0, the
>> > following patch is needed to prevent the compiler from displaying an
>> > error about unsigned __int64 not being convertable to double.
>> Wouldn't it be better to cast to (double) ?
> Wouldn't that be doing the same mistake?  The compiler probably has a
> point: an unsigned 64-bit number has more bits than a simple double
> can handle.

Yes, it's a good reason for not doing the conversion automatically, but
IIUC we need a double, so we don't have much of a choice, and that's
what the cast to (double) would tell the compiler.


        Stefan

bug#720: Patch to fix CVS Emacs compilation error on Windows XP SP2.

[Stefan Monnier]

> "Not implemented"?  I'm not sure we want to support such a deficient
> compiler.

Indeed we don't.

> How about this:

>   DWORD tot_hi = memstex.ullTotalPhys >> 32;
>   DWORD tot_md = (memstex.ullTotalPhys & 0x00000000ffffffffLL) >> 10;
>   DWORD tot_lo = memstex.ullTotalPhys % 1024LL;
>   totphys = tot_hi * 4194304.0 + tot_md + tot_lo / 1024.0;

> Does this work?

Please don't install such hideous code just to work around a deficiency
in an obsolete proprietary compiler.  Especially since there's
a perfectly good Free alternative available.


        Stefan