Re: [xml] MSYS and MINGW: undefined reference to _imp__xmlFree

[Mike Peat]

Does anybody know if this issue has been resolved and if so how?

I very much need to get libxml2 to build for a Windows platform - I have 
an urgent need for a modified version of xmlsec and building the 
libraries on which it depends (openssl, libiconv, zlib, libxml2 and 
libxslt) would appear to be prerequisites for doing that.


I am trying to do that under MinGW/MSys (having had no joy with MSVC due 
to msvcrt.dll incompatibilities), but am running into the error 
undefined reference to _imp__xmlFree. If anybody knows how to solve 
this problem then I would be extremely grateful if they would let me 
know how.


The answer may actually be hidden in the Nov 2009 thread on this topic, 
but I am not enough of a C/C++ developer to be able to figure it out.


Please help!

On a perhaps related note, does anybody know how to get in contact with 
Igor Zlatkovic? I have tried emailing igor zlatkovic com, but have had 
no response so far.


TIA

Mike Peat



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Re: [xml] MSYS and MINGW: undefined reference to _imp__xmlFree

[Mike Peat]

On 16/11/2012 08:06, Daniel Richard G. wrote:

On Fri, 9 Nov 2012, Mike Peat wrote:

I am trying to do that under MinGW/MSys (having had no joy with MSVC 
due to msvcrt.dll incompatibilities), but am running into the error 
undefined reference to _imp__xmlFree. If anybody knows how to solve 
this problem then I would be extremely grateful if they would let me 
know how.


That's a sign that you compiled LibXML2 as a static library, but 
compiled your application to consume LibXML2 as a DLL. When _imp_ is 
prepended to a function name, that means the function lives (or is 
expected to live) in a DLL.


Try compiling your application with -DLIBXML_STATIC.


--Daniel

Daniel - thank you for that (if nothing else it is improving my limited 
insight), but I am running into the problem in compiling libxml2 itself, 
rather than in compiling things that depend on it (actually this may be 
only half true - the error is coming when it gets - I think - to linking 
xmllint.exe). In any case I think I *need* to build DLLs for what I am 
doing.


What I am trying to do is build xmlsec, and (if I am understanding 
correctly... improbable, I suspect) that means I have to first build the 
things it depends on: zlib, libiconv, libxml2, openssl and libxslt. I 
have (I think) built openssl, libiconv and zlib OK in msys using mingw, 
but when I try to build libxml2 I run into the error:


...
  CCLD   xmllint.exe
xmllint.o: In function `processNode': 
E:\MinGW\msys\1.0\projects\xmlsec\libxml2-2.9.0/xmllint.c:1820: 
undefined reference to `_imp__xmlFree'

...

followed by many more of the same sort of thing.

There is mention of what sounds like this problem in xmlexports.h (line 
111):


  /*
   * if defined(IN_LIBXML) this raises problems on mingw with msys
   * _imp__xmlFree listed as missing. Try to workaround the problem
   * by also making that declaration when compiling client code.
   */

I am doing (in /projects/xmlsec/libxml2-2.9.0):

make clean

./configure --prefix=/projects/xmlsec/libxml2-2.9.0 
--build=i686-pc-mingw32 --host=i686-pc-winnt 
--with-iconv=/projects/xmlsec/libiconv-1.14 
--with-zlib=/projects/xmlsec/zlib-1.2.7


make

Any suggestions *very* gratefully received. :-(

--Mike

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