Undefined reference errors when including external library libxml2 in android ndk

Question

I'm trying to use libxml2 with android ndk. When I run the make file, I got errors saying that file 'unicode/ucnv.h' does not exist. I've seen 'unicode/ucnv.h' is included in one of the files and no such header file is present. So I downloaded unicode header files from http://site.icu-project.org/ and placed them in include folder.

Now the previous error is gone but I've got these errors.

SharedLibrary : libxml2.so

./obj/local/armeabi/objs-debug/xml2/encoding.o: In function `openIcuConverter':
C:\test\hello-jni/jni/encoding.c:109: undefined reference to `ucnv_open_49'
C:\test\hello-jni/jni/encoding.c:115: undefined reference to `ucnv_setToUCallBack_49'
C:\test\hello-jni/jni/encoding.c:119: undefined reference to `ucnv_setFromUCallBack_49'
C:\test\hello-jni/jni/encoding.c:126: undefined reference to `ucnv_open_49'
C:\test\hello-jni/jni/encoding.c:132: undefined reference to `ucnv_close_49'
C:\test\hello-jni/jni/encoding.c:135: undefined reference to `UCNV_TO_U_CALLBACK_STOP_49'
C:\test\hello-jni/jni/encoding.c:135: undefined reference to `UCNV_FROM_U_CALLBACK_STOP_49'
./obj/local/armeabi/objs-debug/xml2/encoding.o: In function `closeIcuConverter':
C:\test\hello-jni/jni/encoding.c:141: undefined reference to `ucnv_close_49'
C:\test\hello-jni/jni/encoding.c:142: undefined reference to `ucnv_close_49'
./obj/local/armeabi/objs-debug/xml2/encoding.o: In function `xmlUconvWrapper':
C:\test\hello-jni/jni/encoding.c:1865: undefined reference to `ucnv_convertEx_49'
C:\test\hello-jni/jni/encoding.c:1870: undefined reference to `ucnv_convertEx_49'

collect2: ld returned 1 exit status make: * [obj/local/armeabi/libxml2.so] Error 1

I didn't find function ucnv_open_49 in any of the files. Am I the only one who is facing this problem?

Nick · Accepted Answer · 2012-06-28 11:10:15Z

1

Build unicode library (icu) along with libxml2 and mention in LOCAL_SHARED_LIBRARIES. That's it!

edited Jun 28, 2012 at 11:10

Nick

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answered May 24, 2012 at 10:11

jaffa

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NuSkooler · Accepted Answer · 2012-05-25 14:44:05Z

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Are you intending to link libxml2 against ICU (e.g. use it for conversion)? It's optional but currently you have it enabled. With such you'll need ICU to be linked in as well rather static or dynamic. See the libxml2's configure script for options. Some of which are iconv or even no converters if you intend to work with UTF-8 only.

edited May 25, 2012 at 14:44

answered May 24, 2012 at 15:57

NuSkooler

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1 Comment

NuSkooler Over a year ago

I'm not sure what you mean? Cygwin and Mintty terminals can display Unicode, sure. This doesn't give you a pass with your issue though. Libxml2 needs configured a) use another converter instead of ICU such as iconv, b) converters disabled, or c) linked against ICU. Any of these options can solve your issue depending on your needs.

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