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

[Qt Enthusiast]

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I have a file

1. 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

1. g++ -fPIC -c myStubs.cpp -o lib_mylib.o
2. 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

1. 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