Fork#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
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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.
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Ticket Status:
Reporter: keith
Owner: keith
Type: Issues
Status: Closed
Priority: 7
MileStone: (None)
Component: WSL
Severity: 8
Resolution: Fixed
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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
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