Android Build Teststub -- Linker failed "undefined symbol" Android.bp // maybe missing an include path?

[jrw]

Hello,

i'm facing an issue with the linker, most likely because of lack of knowledge :/

i think i lack an include path or something like that, but i could not find something in the documentation or got confused by the Android.bp files.

i try to simple example fuzzer:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "sonic.h"
#include "wave.h"

#define BUFFER_SIZE 2048

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {

    short inBuffer[BUFFER_SIZE];
    int foo = 10;
    int bar = 1;

    waveFile batz = openInputWaveFile((char*)data, &foo,&bar);

    readFromWaveFile(batz,inBuffer,size);

    return 0;
}

for that, i setup an Android.bp file in the subfolder "fuzz" i created.

cc_fuzz {
    name: "sonic_fuzz",
    host_supported: false,
    srcs: [
        "sonic_fuzz.cc",
    ],
    shared_libs: [
    "libsonic",
    ],
    cflags: [
    "-g",
    ],
    cpp_std: "c++98",
}

and after i tried to build it, i get:

ld.lld: error: undefined symbol: openInputWaveFile(char*, int*, int*)
>>> referenced by sonic_fuzz.cc:16 (external/sonic/fuzz/sonic_fuzz.cc:16)
>>>               out/soong/.intermediates/external/sonic/fuzz/sonic_fuzz/android_arm64_armv8-a_cortex-a73_hwasan_fuzzer/obj/external/sonic/fuzz/sonic_fuzz.o:(LLVMFuzzerTestOneInput)

ld.lld: error: undefined symbol: readFromWaveFile(waveFileStruct*, short*, int)
>>> referenced by sonic_fuzz.cc:18 (external/sonic/fuzz/sonic_fuzz.cc:18)
>>>               out/soong/.intermediates/external/sonic/fuzz/sonic_fuzz/android_arm64_armv8-a_cortex-a73_hwasan_fuzzer/obj/external/sonic/fuzz/sonic_fuzz.o:(LLVMFuzzerTestOneInput)
clang-10: error: linker command failed with exit code 1 (use -v to see invocation)
23:28:40 ninja failed with: exit status 1

#### failed to build some targets (13:07 (mm:ss)) ####

do i need to include some path for the sonic library in the Android.bp file or something?

Thanks for your help

Hannes

[Dan Willemsen]

The `libsonic` in Android only includes `sonic.c`: https://cs.android.com/android/platform/superproject/+/master:external/sonic/Android.bp

openInputWaveFile and readFromWaveFile are in `wave.c`

- Dan

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[jrw]

no wonder the symbol isn't found. thanks for the fast response!