symbol lookup error on linux about libimagequant HOT 8 CLOSED

I presume you're using this with Java via JNI.

Did you build jnilib with the included makefile?

from libimagequant.

@kornelski Yes, I build it, and tried both .jnilib and .so file, but no lucky

from libimagequant.

The line that builds the lib is

$(CC) -g $(CFLAGS) $(LDFLAGS) $(JAVAINCLUDE) -shared -o $@ $(STATICLIB) org/pngquant/PngQuant.c

where $(STATICLIB) is libimagequant.a, and should be linked and contain the required symbols.

If you run this:

nm libimagequant.a | grep liq_attr_create

does it print something like:

0000000000000900 T _liq_attr_create

?

from libimagequant.

It prints

0000000000003160 T liq_attr_create
00000000000032f0 T liq_attr_create_with_allocator

from libimagequant.

That looks fine. I'm not sure why java is failing to find it.

Maybe try compiling with -fPIC?

make clean
./configure CFLAGS=-fPIC
make java

from libimagequant.

Tried CFLAGS=-fPIC and still not work!

from libimagequant.

same error here in centos7 with compiler gcc(4.8.5)

but i think i find a solution somehow, it worked at least. ´_>`

1. in line 68 in makefile, put $(STATICLIB) to the end

$(CC) -g $(CFLAGS) $(LDFLAGS) $(JAVAINCLUDE) -shared -o $@ org/pngquant/PngQuant.c $(STATICLIB)

2. run make java and get file libimagequant.jnilib
3. use libimagequant.jnilib in Java code

    static {
        System.load("/absolute/path/libimagequant.jnilib");

         // if you put the lib to libpath like /usr/lib, hmmm.. maybe a '.so' suffix is required
         // System.loadLibrary("imagequant");
    }

IMPORTANT: the filesize of libimagequant.jnilib is 126K while it is 53K before the change of makefile

i guess the previous libimagequant.jnilib(53K) does not include libimagequant.a

hope it helps :)

from libimagequant.

Thanks for the tip. I've moved the library to the end of the linker invocation. What a magic…

from libimagequant.