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Today's Topics:
1. [mingw] #39757: Compilation with GNU-C++ creates multiple
definitions of vsnprintf() (MinGW Notification List)
2. [mingw] #39763: different approximation of float in Wind and
in Linux (MinGW Notification List)
3. [mingw] #39766: Support gratuitous GCC dependencies
(MinGW Notification List)
----------------------------------------------------------------------
Message: 1
Date: Fri, 15 Nov 2019 13:26:30 +0000
From: MinGW Notification List <[email protected]>
To: OSDN Ticket System <[email protected]>
Subject: [MinGW-Notify] [mingw] #39757: Compilation with GNU-C++
creates multiple definitions of vsnprintf()
Message-ID: <[email protected]>
Content-Type: text/plain; charset=UTF-8
#39757: Compilation with GNU-C++ creates multiple definitions of vsnprintf()
Open Date: 2019-11-13 14:00
Last Update: 2019-11-15 13:26
URL for this Ticket:
https://osdn.net//projects/mingw/ticket/39757
RSS feed for this Ticket:
https://osdn.net/ticket/ticket_rss.php?group_id=3917&tid=39757
---------------------------------------------------------------------
Last Changes/Comment on this Ticket:
2019-11-15 13:26 Updated by: keith
* Status Update from Open to Closed
* Resolution Update from None to Fixed
Comment:
I applied the proposed patch, and committed it as changeset id.3c7767e. This
will be included in the next WSL release.
---------------------------------------------------------------------
Ticket Status:
Reporter: keith
Owner: keith
Type: Issues
Status: Closed
Priority: 7
MileStone: (None)
Component: WSL
Severity: 8
Resolution: Fixed
---------------------------------------------------------------------
Ticket details:
As reported in this pair of e-mail threads:
• https://osdn.net/projects/mingw/lists/archive/users/2019-August/000333.html
• https://osdn.net/projects/mingw/lists/archive/users/2019-August/000335.html
compilation of any C++ translation unit which refers, either directly or
indirectly, to vsnprintf(), will result in link failure, due to multiple public
definitions of this symbol. The issue is clearly illustrated by the following
code, (abstracted from the latter e-mail report):
1. #include <stdio.h>
2. #include <stdarg.h>
3.
4. void debug_log(const char *fmt, ...) {
5. va_list args;
6. va_start(args, fmt);
7. char buf[1+vsnprintf(NULL, 0, fmt, args)];
8. vsnprintf(buf, sizeof buf, fmt, args);
9. va_end(args);
10. }
11.
12. main() {
13. printf("mingw-link\n");
14. }
compilation of which yields:
$ g++ -o mingw-link.exe main.cpp
c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe:
c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../libmingwex.a(vsnprintf.o):(.text+0x0):
multiple definition of `vsnprintf';
main.cpp:(.text$vsnprintf[_vsnprintf]+0x0): first defined here
collect2.exe: error: ld returned 1 exit status
--
Ticket information of MinGW - Minimalist GNU for Windows project
MinGW - Minimalist GNU for Windows Project is hosted on OSDN
Project URL: https://osdn.net/projects/mingw/
OSDN: https://osdn.net
URL for this Ticket:
https://osdn.net/projects/mingw/ticket/39757
RSS feed for this Ticket:
https://osdn.net/ticket/ticket_rss.php?group_id=3917&tid=39757
------------------------------
Message: 2
Date: Fri, 15 Nov 2019 14:28:53 +0000
From: MinGW Notification List <[email protected]>
To: OSDN Ticket System <[email protected]>
Subject: [MinGW-Notify] [mingw] #39763: different approximation of
float in Wind and in Linux
Message-ID: <[email protected]>
Content-Type: text/plain; charset=UTF-8
#39763: different approximation of float in Wind and in Linux
Open Date: 2019-11-14 22:43
Last Update: 2019-11-15 14:28
URL for this Ticket:
https://osdn.net//projects/mingw/ticket/39763
RSS feed for this Ticket:
https://osdn.net/ticket/ticket_rss.php?group_id=3917&tid=39763
---------------------------------------------------------------------
Last Changes/Comment on this Ticket:
2019-11-15 14:28 Updated by: keith
* Status Update from Open to Closed
* Resolution Update from None to Invalid
Comment:
Hello Claus,
I have three comments:
• Firstly, this is neither a bug report, nor a feature request; it is a
support request, (for which use of this ticket system is not appropriate);
as such it should have been directed to the mailing list, where it would
attain better exposure, and have a greater chance of attracting a fruitful
discussion, (which it will not achieve here).
• Secondly, the compiler you are using is badged as a TDM release, which is
not a genuine MinGW.org product. Indeed, the TDM distributor is not
authorized to use the MinGW trademark, so describing the TDM product as
"MinGW" is, technically, a trademark infringement.
• Finally, I've compiled your code fragment, (with addition of appropriate
header files, and wrapping it within a main function), using my genuine
(albeit experimental) MinGW build of GCC-9.2, (built as a Linux hosted
cross-compiler), with mingwrt-5.2.2 and w32api-5.2.2, and running under
Wine-4.18, I cannot reproduce your issue ... I see results of 25 in both
cases.
---------------------------------------------------------------------
Ticket Status:
Reporter: claus
Owner: (None)
Type: Issues
Status: Closed
Priority: 5 - Medium
MileStone: (None)
Component: GCC
Severity: 5 - Medium
Resolution: Invalid
---------------------------------------------------------------------
Ticket details:
Dear developers, when I run the following code:
int x=5; printf ("%d\n" , (int)pow(x,2)); printf ("%d\n" , (int)pow(5,2));
I get different results if working on: - Windows 7 and 10, gcc version: gcc
(tdm-1) 5.1.0 from last MinGW was the same some years ago with previous
versions: the results are 24 and 25; - Linux, many distro, many gcc versions:
the results are 25 and 25. To me, the Windows answer should be the same as the
first argument is int 5 in both cases. Could you please give a clarification. I
wasn't able to find any justification for my univ. students. Thank you in
advance
Claus
--
Ticket information of MinGW - Minimalist GNU for Windows project
MinGW - Minimalist GNU for Windows Project is hosted on OSDN
Project URL: https://osdn.net/projects/mingw/
OSDN: https://osdn.net
URL for this Ticket:
https://osdn.net/projects/mingw/ticket/39763
RSS feed for this Ticket:
https://osdn.net/ticket/ticket_rss.php?group_id=3917&tid=39763
------------------------------
Message: 3
Date: Fri, 15 Nov 2019 19:44:40 +0000
From: MinGW Notification List <[email protected]>
To: OSDN Ticket System <[email protected]>
Subject: [MinGW-Notify] [mingw] #39766: Support gratuitous GCC
dependencies
Message-ID: <[email protected]>
Content-Type: text/plain; charset=UTF-8
#39766: Support gratuitous GCC dependencies
Open Date: 2019-11-15 19:44
Last Update: 2019-11-15 19:44
URL for this Ticket:
https://osdn.net//projects/mingw/ticket/39766
RSS feed for this Ticket:
https://osdn.net/ticket/ticket_rss.php?group_id=3917&tid=39766
---------------------------------------------------------------------
Last Changes/Comment on this Ticket:
2019-11-15 19:44 Updated by: keith
* New Ticket "Support gratuitous GCC dependencies" created
---------------------------------------------------------------------
Ticket Status:
Reporter: keith
Owner: (None)
Type: Feature Request
Status: Open
Priority: 5 - Medium
MileStone: (None)
Component: WSL
Severity: 5 - Medium
Resolution: None
---------------------------------------------------------------------
Ticket details:
MS-Windows builds of GCC-9.x gratuitously require Microsoft's non-standard
_get_errno() and _set_errno() functions, which are not supported by MSVCRT.DLL
prior to Windows-Vista. Additionally, this same GCC version introduces a
dependency on a ftruncate64() function, which, as ftruncate() is mapped to
Microsoft's _chsize(), could be mapped to Microsoft's _chsize_s(); however,
like the two non-standard errno accessors, _chsize_s() is unsupported, without
introducing dependencies on non-free Microsoft DLLs, prior to Windows-Vista.
Such gratuitous GCC dependencies are incompatible with MinGW.org's policy of
continuing legacy support for pre-Vista Windows versions.
The attached patch offers work-arounds for each of these gratuitous GCC
dependencies, extending support to pre-Vista Windows, while still linking with
MSVCRT.DLL.
--
Ticket information of MinGW - Minimalist GNU for Windows project
MinGW - Minimalist GNU for Windows Project is hosted on OSDN
Project URL: https://osdn.net/projects/mingw/
OSDN: https://osdn.net
URL for this Ticket:
https://osdn.net/projects/mingw/ticket/39766
RSS feed for this Ticket:
https://osdn.net/ticket/ticket_rss.php?group_id=3917&tid=39766
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