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Subject: bug#25663: verify macro in system.h incorrectly expects 8 byte long for 64-bit builds on Windows/Visual Studio
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From: Kees Dekker <Kees.Dekker@HIDDEN>
Thread-Topic: verify macro in system.h incorrectly expects 8 byte long for
64-bit builds on Windows/Visual Studio
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Date: Thu, 9 Feb 2017 13:15:43 +0000
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Hi,
The verify macro in system.h:137 (diffutils3.5) fails on Windows.
This line contains the following code:
verify (sizeof (lin) <=3D sizeof (long int));
Because of a long on Windows remains 32-bit (for Visual Studio), even in 64=
-bit mode, this compile time assert fails. It is only for *NIX that a long =
sizes identical to the bit-ness of the build, similar to pointers.
For an integer type that properly sizes with pointers, you need to use intp=
tr_t. See also https://msdn.microsoft.com/nl-nl/library/s3f49ktz.aspx.
I'm not sure how gcc behaves on Windows, but event then intptr_t is probabl=
y the better type to use.
If Visual Studio is used, then the _MSCVER macro is set, see also https://m=
sdn.microsoft.com/en-us/library/b0084kay.aspx.
Can you please fix this?
Regards,
Kees
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<p class=3D"MsoNormal">Hi,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">The verify macro in system.h:137 (diffutils3.5) fail=
s on Windows.<o:p></o:p></p>
<p class=3D"MsoNormal">This line contains the following code:<o:p></o:p></p=
>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">verify (sizeof (lin) <=3D sizeof (long int));<o:p=
></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Because of a long on Windows remains 32-bit (for Vis=
ual Studio), even in 64-bit mode, this compile time assert fails. It is onl=
y for *NIX that a long sizes identical to the bit-ness of the build, simila=
r to pointers.<o:p></o:p></p>
<p class=3D"MsoNormal">For an integer type that properly sizes with pointer=
s, you need to use intptr_t. See also
<a href=3D"https://msdn.microsoft.com/nl-nl/library/s3f49ktz.aspx">https://=
msdn.microsoft.com/nl-nl/library/s3f49ktz.aspx</a>.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">I’m not sure how gcc behaves on Windows, but e=
vent then intptr_t is probably the better type to use.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">If Visual Studio is used, then the _MSCVER macro is =
set, see also https://msdn.microsoft.com/en-us/library/b0084kay.aspx.<o:p><=
/o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Can you please fix this?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Regards,<o:p></o:p></p>
<p class=3D"MsoNormal">Kees<o:p></o:p></p>
</div>
</body>
</html>
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Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Kees Dekker <Kees.Dekker@HIDDEN> Subject: bug#25663: Acknowledgement (verify macro in system.h incorrectly expects 8 byte long for 64-bit builds on Windows/Visual Studio) Message-ID: <handler.25663.B.14866461632867.ack <at> debbugs.gnu.org> References: <858F859BB4F2824EBAB5D4ED58214CB7016A452CC8@HIDDEN> X-Gnu-PR-Message: ack 25663 X-Gnu-PR-Package: diffutils Reply-To: 25663 <at> debbugs.gnu.org Date: Thu, 09 Feb 2017 13:17:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-diffutils@HIDDEN If you wish to submit further information on this problem, please send it to 25663 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 25663: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D25663 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: bug#25663: [bug-diffutils] bug#25663: verify macro in system.h incorrectly expects 8 byte long for 64-bit builds on Windows/Visual Studio
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On 02/09/2017 05:15 AM, Kees Dekker wrote:
>
> Can you please fix this?
>
Just to be clear, porting GNU diffutils to Visual Studio is quite low on
our priority list. Perhaps someday somebody will contribute
self-contained patches for that, patches that do not significantly get
in the way of maintaining diffutils. But it's unlikely that any
maintainer will have time to spare to actually write the code for such a
low-priority task. In the meantime, I suggest that you use GNU/Linux or
some other more-GNUish platform; even Microsoft ships platforms like
that nowadays.
X-Loop: help-debbugs@HIDDEN
Subject: bug#25663: [bug-diffutils] bug#25663: verify macro in system.h incorrectly expects 8 byte long for 64-bit builds on Windows/Visual Studio
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From: Kees Dekker <Kees.Dekker@HIDDEN>
Thread-Topic: [bug-diffutils] bug#25663: verify macro in system.h
incorrectly expects 8 byte long for 64-bit builds on Windows/Visual Studio
Thread-Index: AdKC1e7CXee/hnnRQyS+S3GAfW/HfQAKzqkAABls1JA=
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Subject: bug#25663: [bug-diffutils] bug#25663: verify macro in system.h incorrectly expects 8 byte long for 64-bit builds on Windows/Visual Studio
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Kees Dekker wrote:
> I've no choice to move away from Windows.
You don't need to. Microsoft ships GNU diff as part of an optional MS-Win=
dows=20
subsystem. This should be a lot less work for us maintainers than trying =
to=20
maintain a separate MS-Windows "native" port (whatever "native" means) fo=
r GNU=20
diff. See:
https://msdn.microsoft.com/en-us/commandline/wsl/about
> in which format do you like to get it. UNIX style patch?
"git format-patch" format, where the commit message uses GNU ChangeLog st=
yle.=20
See the existing git repository for examples of this. The changes should =
be=20
minimal and cleanly separable from the mainline source, and using the sam=
e style=20
as what we have now.
X-Loop: help-debbugs@HIDDEN
Subject: bug#25663: [bug-diffutils] bug#25663: verify macro in system.h incorrectly expects 8 byte long for 64-bit builds on Windows/Visual Studio
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Thread-Topic: [bug-diffutils] bug#25663: verify macro in system.h
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Subject: bug#25663: [bug-diffutils] bug#25663: verify macro in system.h incorrectly expects 8 byte long for 64-bit builds on Windows/Visual Studio
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Kees Dekker wrote:
> If you have an additional source of information, it would be great. I'm new to git, so I will try to do so.
I'm afraid it's not written down in a central location. There are books about
Git and it's not that hard to pick up. You can look at the Emacs CONTRIBUTE file
for some advice about commit messages.
http://git.savannah.gnu.org/cgit/emacs.git/tree/CONTRIBUTE
X-Loop: help-debbugs@HIDDEN
Subject: bug#25663: [bug-diffutils] bug#25663: verify macro in system.h incorrectly expects 8 byte long for 64-bit builds on Windows/Visual Studio
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Thread-Topic: [bug-diffutils] bug#25663: verify macro in system.h
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X-Loop: help-debbugs@HIDDEN
Subject: bug#25663: [bug-diffutils] bug#25663: verify macro in system.h incorrectly expects 8 byte long for 64-bit builds on Windows/Visual Studio
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From: Paul Eggert <eggert@HIDDEN>
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Kees Dekker wrote:
> Line numbers beyond 2^32 are also IMO hypothetical...
It's 2**31, and we don't want arbitrary limits like that in GNU code. It'=
s easy=20
to generate line numbers larger than that nowadays. Here's a contrived ex=
ample:
$ rm -f big
$ truncate --size 10TiB big
$ echo x >>big
$ ls -l big
-rw-r--r--. 1 eggert eggert 10995116277762 Feb 12 00:38 big
$ grep -zn x big
10995116277761:x
Although diff is not nearly as good as grep with large files (that 'grep'=
=20
command consumes only 4 ms real time on my old office desktop), diff shou=
ldn't=20
purposely have problems in that area.
You should be able to avoid the problem by compiling with Cygwin.
X-Loop: help-debbugs@HIDDEN
Subject: bug#25663: [bug-diffutils] bug#25663: verify macro in system.h incorrectly expects 8 byte long for 64-bit builds on Windows/Visual Studio
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Thread-Topic: [bug-diffutils] bug#25663: verify macro in system.h
incorrectly expects 8 byte long for 64-bit builds on Windows/Visual Studio
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Subject: bug#25663: [bug-diffutils] bug#25663: verify macro in system.h incorrectly expects 8 byte long for 64-bit builds on Windows/Visual Studio
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On 02/12/2017 10:44 PM, Kees Dekker wrote:
> there is no editor capable in opening such large files
Sure there is. Emacs can do it (I just tried it). It's quite slow, but
it works. And even if it didn't work, core commands like 'diff'
shouldn't arbitrarily limit themselves to small files.
No doubt 'diff' can be fixed to work even on MS-Windows platforms.
However, arbitrarily limiting line numbers to 32 bits is not the way to
go about it.
GNU bug tracking system
Copyright (C) 1999 Darren O. Benham,
1997 nCipher Corporation Ltd,
1994-97 Ian Jackson.