Created attachment 151750 [details]
The very simple that don't compile on windows

When compiling on windows and using libxml2 in two cpp file, i have the error multiple definition file.
To reproduce the problem i have a simple example :

main.cpp
--------
#include "prog1.h"
#include "prog2.h"

int main() {
	testFunc1();
	testFunc2();
	
	return 1;
}

prog1.h
-------
void testFunc1();

prog2.h
-------
void testFunc2();

prog1.cpp
---------
#include <libxml/parser.h>
#include <libxml/xpath.h>
#include <libxml/xpathInternals.h>
#include <libxml/tree.h>

void testFunc1() {
  // do nothing
}

prog2.cpp
---------
#include <libxml/xpathInternals.h>

void testFunc2() {
  // do nothing
}

compilation
-----------

mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory `C:/DevCpp/mytest'
g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -
DQT_DLL -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I"..\..\Qt\2009.05\qt\include" -I"
." -I"..\..\Qt\2009.05\qt\include\ActiveQt" -I"debug" -I"..\..\Qt\2009.05\qt\mks
pecs\default" -o debug\prog2.o prog2.cpp
g++ -enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-rel
oc -mthreads -Wl -Wl,-subsystem,windows -o debug\test.exe debug/main.o debug/pro
g1.o debug/prog2.o  -L"c:\Qt\2009.05\qt\lib" -lmingw32 -lqtmaind
debug/prog2.o: In function `Z9testFunc2v':
C:\DevCpp\mytest/prog2.cpp:3: multiple definition of `forbiddenExp'
debug/prog1.o:C:\DevCpp\mytest/prog1.cpp:6: first defined here
debug/prog2.o: In function `Z9testFunc2v':
C:\DevCpp\mytest/prog2.cpp:5: multiple definition of `emptyExp'
debug/prog1.o:C:\DevCpp\mytest/prog1.cpp:8: first defined here
debug/prog2.o:prog2.cpp:(.bss+0x8): multiple definition of `xmlMalloc'
debug/prog1.o:prog1.cpp:(.bss+0x8): first defined here
debug/prog2.o:prog2.cpp:(.bss+0xc): multiple definition of `xmlMallocAtomic'
debug/prog1.o:prog1.cpp:(.bss+0xc): first defined here
debug/prog2.o:prog2.cpp:(.bss+0x10): multiple definition of `xmlRealloc'
debug/prog1.o:prog1.cpp:(.bss+0x10): first defined here
debug/prog2.o:prog2.cpp:(.bss+0x14): multiple definition of `xmlFree'
debug/prog1.o:prog1.cpp:(.bss+0x14): first defined here
debug/prog2.o:prog2.cpp:(.bss+0x18): multiple definition of `xmlMemStrdup'
debug/prog1.o:prog1.cpp:(.bss+0x18): first defined here
debug/prog2.o:prog2.cpp:(.bss+0x20): multiple definition of `xmlXPathNAN'
debug/prog1.o:prog1.cpp:(.bss+0x20): first defined here
debug/prog2.o:prog2.cpp:(.bss+0x28): multiple definition of `xmlXPathPINF'
debug/prog1.o:prog1.cpp:(.bss+0x28): first defined here
debug/prog2.o:prog2.cpp:(.bss+0x30): multiple definition of `xmlXPathNINF'
debug/prog1.o:prog1.cpp:(.bss+0x30): first defined here
collect2: ld returned 1 exit status
mingw32-make[1]: *** [debug\test.exe] Error 1
mingw32-make[1]: Leaving directory `C:/DevCpp/mytest'
mingw32-make: *** [debug] Error 2

if i include in one of cpp file the compilation work.

In the real, the two file contains parsing of different file.

I attach the example.

The same example compile on linux (Add library -lxml2 don't change the compilation result on windows, include is in the mingw directory)