how to use snprintf() in g++ -std=c++11 version 4.8.2

Question

I am trying compile code that uses snprintf in version 4.8.2 of g++ with -std=c++11 without success. Why doesn't g++ recognize snprintf? Can I overcome this while still using snprintf and c++11?

I got the following:

make all  Building file: ../src/cppHWtest.cpp Invoking: Cygwin C++
Compiler g++ -std=c++11 -D"hash_map=unordered_map" -O0 -g3 -Wall -c
-fmessage-length=0 -MMD -MP -MF"src/cppHWtest.d" -MT"src/cppHWtest.d" -o "src/cppHWtest.o" "../src/cppHWtest.cpp" cygwin warning:   MS-DOS style path detected: C:\Users\poudyal\workspace\cppHWtest\Debug
Preferred POSIX equivalent is:
/cygdrive/c/Users/poudyal/workspace/cppHWtest/Debug   CYGWIN
environment variable option "nodosfilewarning" turns off this warning.
Consult the user's guide for more details about POSIX paths:
    http://cygwin.com/cygwin-ug-net/using.html#using-pathnames ../src/cppHWtest.cpp: In function 'int main()':
../src/cppHWtest.cpp:20:35: error: 'snprintf' was not declared in this
scope   snprintf(buff, 10, "%s", "Hell O");
                                   ^ make: *** [src/cppHWtest.o] Error 1 src/subdir.mk:18: recipe for target 'src/cppHWtest.o' failed

**** Build Finished ****

This cygwin mailing list archive thread is about a supposedly-fixed bug that caused snprintf not to be declared for -std=c++0x. Suggested workaround was to use -std=gnu++0x instead. Just for the heck of it, try -std=gnu++11 and see what happens. — Casey
– Casey, Commented Nov 22, 2013 at 17:43
I find now that vector<double> has the same problem. vector<> is fine with -std=c++11 — vjktm
– vjktm, Commented Nov 22, 2013 at 21:39
#include <vector> fixed that. This was a bad oversight, sorry. — vjktm
– vjktm, Commented Nov 22, 2013 at 22:11
On Cygwin, I can verify that -std=c++11 does not work either. But -std=gnu++11 does work. On real Linux (e.g. CentOS), -std=c++11 works fine. — Mark Lakata
– Mark Lakata, Commented Jun 11, 2014 at 17:10

Pavel Kirienko · Accepted Answer · 2014-04-15 20:23:32Z

6

Probably less intrusive solution than switching the mode to -std=gnu++11 is -U__STRICT_ANSI__. This will enable #if !defined(__STRICT_ANSI__) || (__STDC_VERSION__ >= 199901L) at stdio.h:234 (GCC 4.8.3).

answered Apr 15, 2014 at 20:23

Pavel Kirienko

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serup Over a year ago

when building both on ubuntu/linux and on windows with cygwin, then this solution will be the best solution - it worked for me - thanks

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