[igraph] Re: igraph, visual studio c++ and libxml2

[Francois Bastardie]

Hello,
Thank you for your help. Indeed I had to modify config.h to set up HAVE_LIBXML 
to 1.
Nevertheless this is still not enough to run the graphml.c example with msvc 
2010 because it failed to compile with these hereafter message errors: 
"unresolved external symbols", and despite every indication to the contrary, it 
does not seems to be a problem of linkage to the dependent libraries. Actually 
I did a search over all the files of igraph and libxml2 and indeed these 
symbols are nowhere defined while they are required by foreign-graphml.c. Is 
that normal? What is missing? Am I wrong?
Best regards,

2>foreign-graphml.obj : error LNK2001: symbole externe non résolu 
_xmlGetPredefinedEntity
2>foreign-graphml.obj : error LNK2001: symbole externe non résolu _xmlStrEqual
2>foreign-graphml.obj : error LNK2001: symbole externe non résolu _xmlStrdup
2>foreign-graphml.obj : error LNK2001: symbole externe non résolu 
_xmlFreeParserCtxt
2>foreign-graphml.obj : error LNK2001: symbole externe non résolu _xmlParseChunk
2>foreign-graphml.obj : error LNK2001: symbole externe non résolu 
_xmlCreatePushParserCtxt


I put also hereafter the command lines in msvc when compiling igraph if anybody 
is used to:

1- for the Includes

/I"C:\igraph-0.5.5-msvc\src" /I"C:\igraph-0.5.5-msvc\winclude" 
/I"C:\libxml2-2.7.7.win32\include\libxml" 
/I"C:\igraph-0.5.5-msvc\winclude\libxml" /nologo /W3 /WX- /O2 /Oy- /D "Win32" 
/D "WIN32" /D "_WINDOWS" /D "_USRDLL" /D "IGRAPH_EXPORTS" /Gm- /EHsc /MD /GS 
/fp:precise /Zc:wchar_t /Zc:forScope /Fp"Release\igraph.pch" /Fa"Release\" 
/Fo"Release\" /Fd"Release\vc100.pdb" /Gd /analyze- /errorReport:queue

2- for the linker

/OUT:"Release\igraph.lib" /LIBPATH:"C:\libxml2-2.7.7.win32\lib" /NOLOGO

In that way I can produce the igraph.lib but then another project trying to use 
it (e.g. with the graphml.c example) will fail and return the fatal errors 
mentioned above.

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Sent: 11 December 2010 18:02
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Subject: igraph-help Digest, Vol 53, Issue 11

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Today's Topics:

   1. Re: igraph, visual studio c++ and libxml2 (Tamas Nepusz)


----------------------------------------------------------------------

Message: 1
Date: Fri, 10 Dec 2010 21:16:36 +0100
From: Tamas Nepusz <address@hidden>
Subject: Re: [igraph] igraph, visual studio c++ and libxml2
To: Help for igraph users <address@hidden>
Message-ID: <address@hidden>
Content-Type: text/plain; charset=us-ascii

> What I did is to set the PATH in msvc to C:\libxml2-2.7.7.win32\bin so that 
> the compiler would be able to find the libxml2.dll when needed, and I also 
> refer to the header files C:\igraph-0.5.5-msvc\winclude\libxml because 
> actually I have the header files already included in igraph-0.5.5-msvc (this 
> confuses me) ,  but this is obviously the wrong way or not enough...
It is the right way, but you also need one more step. Open up config.h and set 
the value of the HAVE_LIBXML macro to 1 instead of 0 which is the default on 
Windows (I guess).

-- 
Tamas




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