I am getting build error when Linking QtCore.a with my Memstub file

Qt Enthusiast

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I have a file

File myStubs.cpp

#include <stdlib.h>
#include <new>

void* qMalloc(size_t sz) {return malloc(sz);}
void qFree(void* ptr) {free(ptr);}
void* qRealloc(void* ptr, size_t sz) {return realloc(ptr, sz);}
I make a static library from this file

g++ -fPIC -c myStubs.cpp -o lib_mylib.o
ar rcs libMyLib.a lib_mylib.o
In Qt Core we have file qglobal.cpp

2 ) File is qt-x11-opensource-src-4.3.3/src/corelib/global/qglobal.cpp and same functions as above in this file are

/*
These functions make it possible to use standard C++ functions with
a similar name from Qt header files (especially template classes).
*/
Q_CORE_EXPORT void *qMalloc(size_t size);
Q_CORE_EXPORT void qFree(void *ptr);
Q_CORE_EXPORT void *qRealloc(void *ptr, size_t size);
When I link the static library libMyLib.a and static library of QtCore (libQtCore.a) and QtGui (libQtGui.a) . I am getting following build error

lib/libQtCore.a(qglobal.o): In function qMalloc(unsigned long)': qglobal.cpp:(.text+0x170): multiple definition of qMalloc(unsigned long)'
libMyLib.a(myStubs.o):myStubs.cpp:(.text+0x0): first defined here
Questions

If I remove qMalloc , qFree and qRealloc from file myStubs.cpp, I do not get the build error , Is this correct way of solving this problem

Looking forward for the feedback

kshegunov

@Qt-Enthusiast said in I am getting undefined reference when Linking QtCore.a with my Memstub file:

Is this correct way of solving this problem

You should state what the problem is. If it's the linker error, then yes, removing the duplicate symbols is the correct way.

SGaist

Hi,

You're not getting an undefined error, you're getting a defined multiple time error. AFAIK, if you want to customize qMalloc and friends you have to modify Qt's source code and build it yourself.

Qt Enthusiast

What is purpose of Stub functions

SGaist

See here