Re: [xml] libxml2 on cygwin

["Gerrit P. Haase" <gerrit familiehaase de>]

Mohamed Kamil Mansor wrote:

> Hello,
>
> I want to share my solution on compiling program that using libxml2 on cygwin.
> Cygwin already prebuild libxml2 package. However while compiling my 
> application, i've got error undefine reference during linking stage. I've 
> search all over the web but didn't get solution to my problem.
>
> --------------- problem during compiling my applicaiton --------------------
> $ make -f Makefile-cygwin
> gcc -g -I/usr/include/libxml2 -DWINDOWS -o ald.o -c ald.c
> gcc -g -I/usr/include/libxml2 -L/usr/lib -lxml2 -lz -liconv -lm -o ald ald.o
> ald.o(.text+0x1217): In function `parseProjfile':
> ald-v0.7/ald.c:392: undefined reference to `_xmlParseFile'
> ald.o(.text+0x1256):ald-v0.7/ald.c:397: undefined reference to 
> `_xmlDocGetRootElement'
> ald.o(.text+0x1282):ald-v0.7/ald.c:401: undefined reference to `_xmlFreeDoc'
> ald.o(.text+0x12a4):ald-v0.7/ald.c:405: undefined reference to `_xmlStrcmp'
> ald.o(.text+0x12cb):ald-v0.7/ald.c:407: undefined reference to `_xmlFreeDoc'
> ald.o(.text+0x138d): In function `parseData':
> ald-v0.7/ald.c:429: undefined reference to `_xmlStrcmp'
> ald.o(.text+0x13da):ald-v0.7/ald.c:434: undefined reference to 
> `_xmlNodeListGetString'
> ald.o(.text+0x13f3):ald-v0.7/ald.c:435: undefined reference to `_xmlStrcmp'
> collect2: ld returned 1 exit status
> make: *** [ald] Error 1
> ---------------------------- end -------------------------
>
> xml2-config output:
> $ xml2-config --libs
> -L/usr/lib -lxml2 -lz -liconv -lm
>
> $ xml2-config --cflags
> -I/usr/include/libxml2
>
> part of content file: /usr/lib/libxml2.la
> --------------- snap -------------------
> # The name that we can dlopen(3).
> dlname='../bin/cygxml2-2.dll'
>
> # Names of this library.
> library_names='libxml2.dll.a'
> -------------- snip ------------------
> As described in libxml2.la file, the dlname='../bin/cygxml2-2.dll' which 
> located in /usr/bin/cygxml2-2.dll. However the actual cygxml2-2.dll file 
> located at /bin and not at /usr/bin.
>
> So i've changed /usr/lib/libxml2.la file into:
> --------------- snap -------------------
> # The name that we can dlopen(3).
> dlname='/bin/cygxml2-2.dll'
>
> # Names of this library.
> library_names='libxml2.dll.a'
> -------------- snip ------------------
>
> Then i've also add options "--dll-search-prefix=cyg -L/bin -lxml2-2" during 
> linking process.
> --------------- compilation success with no error ----------------
> $ make -f Makefile-cygwin
> gcc -g -I/usr/include/libxml2 -DWINDOWS -o ald.o -c ald.c
> gcc -g -I/usr/include/libxml2 -L/usr/lib -lxml2 -lz -liconv -lm 
> --dll-search-prefix=cyg -L/bin -lxml2-2 -o ald ald.o
> ---------------- end -------------------------
>
> Hopefully, this solutions will help other peoples that face same problem with 
> me. Good luck.

This is wrong though it works.

You need to use the tools as they are meant to be used:

The libraries must be at the beginning of the link command,
the linker reads the command from right to left, so try this:

gcc -g -o ald ald.o -L/usr/lib -lxml2 -lz -liconv -lm

and you're done.


Regards,
Gerrit
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