Creating a shared lib (.so) using the autotools in KDev

[Dries Decock]

I have created several shared libraries for java. I leeve the target as a 
probram in bin. Then I :
 * set compiler flags for c++ -fPIC
 * set the linker flags to :  -shared -o libxxxx.so
This works for me !

I hope this helps.


On Friday 11 November 2005 20:42, David Ohlemacher wrote:
> Hi all,
>
> I am trying to create a shared library (.so) using KDevelop 3.2.2 (KDE
> 3.4.2 on FC4).  I am trying to use this shared lib from within Java
> using the Java Native Interface (JNI).        Has anyone done this?
>
> According to the mediaWiki FAQ
> <http://www.kdevelop.org/mediawiki/index.php/FAQ#How_to_create_a_.so_librar
>y.3F>, I need to follow these steps:
>
>     * Add a target to the project
>           o primary: Library
>           o prefix: noinst
>           o file name: your_lib.so
>           o Linker Flags->Other: -shared
>     * Add the cpp/h files to this target
>     * set compiler flags for c++  -fPIC
>
> I did all these things.   The library gets created as
> libJniHelloWorld.so.a, which is wrong. Also, all the options remained
> grayed out when I select the library and noinst options.  I had to apply
> them, then open the properties, in order to add -shared.
>
> When I try to use the library, I get "invalid ELF header" from Java.
>
> If I manually make the library, w/o kdevelop, I get a proper shared lib:
>     * gcc -shared -I/opt/j2sdk1.4.2_10/include/
> -I/opt/j2sdk1.4.2_10/include/linux/ JniHelloWorld.c -o libJniHelloWorld.so
> This lib works fine.
>
> I also have created and tried a libtool library, libJniHelloWorld.la.
> The JNI refuses to load this at all, since it only lets you specify
> "JniHelloWorld" and it assumes the lib prefix and .so extension.  I did
> set LD_LIBRARY_PATH to include the pwd.
> java.lang.UnsatisfiedLinkError: no libnumlist.la in java.library.path
>
> I either need to get the autotools to create a shared library (.so), or
> get the JNI to load a .la file.
>
> Thanks,
> -d
>
>
>
>
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-- 
Dries Decock
Software Engineer
tComLabs
Gildestraat 8
9000 Gent - Belgium

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