Fork#39757: Compilation with GNU-C++ creates multiple definitions of vsnprintf()
Open Date: 2019-11-13 14:00
Last Update: 2019-11-13 14:00
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:
2019-11-13 14:00 Updated by: keith
* New Ticket "Compilation with GNU-C++ creates multiple definitions of vsnprintf
()" created
---------------------------------------------------------------------
Ticket Status:
Reporter: keith
Owner: (None)
Type: Issues
Status: Open
Priority: 5 - Medium
MileStone: (None)
Component: WSL
Severity: 5 - Medium
Resolution: None
---------------------------------------------------------------------
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