undefined reference when using c++11 qmake flags

Question

I have a Qt C++ application that includes a third-party library (along with its .h header file). However, when I set QMAKE_CCFLAGS += -std=c++11 and CONFIG += c++11, I get undefined reference for function calls to this third-party library.

It compiles without c++11 flags.

Is there a way to resolve this?

This is qmake specific when using c++11 flags in the qmake configuration. The DLL file is linked with qmake LIBS and is compiling without the c++11 qmake configuration flag.

Once I set:

QMAKE_CXXFLAGS += -std=c++11
CONFIG += c++11

compiling gives me unresolved symbol errors.

possible duplicate of [What is an undefined reference/unresolved external symbol error and how do I fix it?](http://stackoverflow.com/questions/12573816/what-is-an-undefined-reference-unresolved-external-symbol-error-and-how-do-i-fix) — AndyG, Jun 10 '15 at 21:23
I believe it is not because this is happening when I link third party DLL with header files with C api functions (wrapped in extern C) using qmake, mingw, qt framework **only** with c++11 flags ON. Without them works just fine. — edin-m, Jun 10 '15 at 22:09

score 0 · Accepted Answer · edited May 23 '17 at 11:59

0

Tried the solution for this answer and it resulted in a successful compilation.

It works when I add

QMAKE_CXXFLAGS += -std=gnu++11

Qt 5.4.1 MinGW 4.9.1 32bit

edited May 23 '17 at 11:59

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answered Jul 04 '15 at 13:53

edin-m

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undefined reference when using c++11 qmake flags

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