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Compile shared lib (g++)  RSS feed

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I wrote shared library for JNI in C-style and compile it using command line:
gcc -o libfile.so -shared file.c
(I'm talking about Linux 2.4.x)

When tried make it in C++-style (add extern "C" to each function name)
and used command line

g++ -o libfile.so -shared file.c

After start java print error - "unknown symbol in libgile.so ..."

Do I need any other command line arguments?
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