How to resolve dependency between .so libraries, the cannot locate symbol "cblas_sdsdot" referenced by "libgsl.so" error.

[shekmun]

I want to compile the gsl with ndk and use it on my android phone. And this is my steps:

1, Download the gsl-2.1.tar.gz and unzip it

2, ./configure -> make -> make install inside the gsl folder:

  a) ./configure --prefix=/path/to/install/directory --host="arm-linux-androideabi" --with-sysroot="/path/to/android-ndk-r10e/platforms/android-16/arch-arm" CC="/path/to/android-ndk-r10e/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc" STRIP="/path/to/android-ndk-r10e/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-strip" CFLAGS="--sysroot=/path/to/android-ndk-r10e/platforms/android-16/arch-arm -DANDROID -fPIC -ffunction-sections -funwind-tables -fstack-protector -march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16 -fomit-frame-pointer -fstrict-aliasing -funswitch-loops -finline-limit=300" LDFLAGS="-nostdlib -Wl,--fix-cortex-a8" LIBS="-lgcc -ldl -lz -lm -lc"

  b) make -j4

  c) make install-strip

3, Now I get the libgsl.so and libgslcblas.so.

4, If I use the readelf to check the two librarys I get this:

  a) readelf -Ws libgsl.so | grep UND

     0: 00000000     0 NOTYPE  LOCAL  DEFAULT  UND 

     1: 00000000     0 FUNC    GLOBAL DEFAULT  UND __cxa_finalize

     2: 00000000     0 FUNC    GLOBAL DEFAULT  UND __cxa_atexit

     6: 00000000     0 FUNC    GLOBAL DEFAULT  UND malloc

     7: 00000000     0 FUNC    GLOBAL DEFAULT  UND free

    10: 00000000     0 FUNC    GLOBAL DEFAULT  UND memset

    52: 00000000     0 FUNC    GLOBAL DEFAULT  UND fread

    54: 00000000     0 FUNC    GLOBAL DEFAULT  UND fwrite

    62: 00000000     0 FUNC    GLOBAL DEFAULT  UND putc

    63: 00000000     0 FUNC    GLOBAL DEFAULT  UND fprintf

    65: 00000000     0 FUNC    GLOBAL DEFAULT  UND fscanf

   189: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND cblas_sdsdot ********pay attention this line******

   191: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND cblas_dsdot

   193: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND cblas_sdot

   195: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND cblas_ddot

  b) readelf -Ws libgslcblas.so | grep cblas_sdsdot

    12: 0000298c   268 FUNC    GLOBAL DEFAULT    8 cblas_sdsdot

5, See, the libgsl.so has an undefined symbol link "cblas_sdsdot" and libgslcblas.so defines it.

6, Add the libgsl.so and libgslcblas.so to my android studio. And load the two libraries with java code:

System.loadLibrary("gslcblas");

System.loadLibrary("gsl");

And when it runs to loadLibrary("gsl") the app will crash.

This is the error message:

dlopen("/data/app/com.ict.hci.iwatcher-2/lib/arm/libgsl.so", RTLD_LAZY) failed: dlopen failed: cannot locate symbol "cblas_sdsdot" referenced by "libgsl.so"...

It tell me that cannot find "cblas_sdsdot" and it is not defined libgsl.so but in libgslcblas.so. So how to tell android to find the symbol in libgslcblas.so?

7, I'm working on ubuntu 15.10(x64), android studio 1.5, ndk-r10e. I get the error on android 4.2, 4.4 and 5.0.

[Radovan Chytracek]

Hi,

do you perform dlopen yourselves or you rely on the default systems setting for the shared object symbols resolution?

Radovan

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[J Decker]

dlopen libglscblas.so first?

[shekmun]

I'm using the java code System.loadLibrary("gslcblas"); and then System.loadLibrary("gsl");

As you can see from the error message it's some c++ code like:

dlopen("/data/app/com.ict.hci.iwatcher-2/lib/arm/libgsl.so", RTLD_LAZY)

在 2015年12月30日星期三 UTC+8上午3:01:35，Radovan Chytracek写道：

[shekmun]

Yes, I'm loading the libgslcblas first.

在 2015年12月30日星期三 UTC+8上午5:21:14，J Decker写道：

[shekmun]

I've tried this native c++ code and the ret always be 10:

    int ret = 0;

    if (dlopen("/sdcard/Download/libgslcblas.so", RTLD_LAZY | RTLD_GLOBAL) == NULL) ret += 1;

    if (dlopen("/sdcard/Download/libgsl.so", RTLD_LAZY | RTLD_GLOBAL) == NULL) ret += 10;
    //ret always be 10

在 2015年12月30日星期三 UTC+8上午2:33:57，shekmun写道：

[shekmun]

Ok, it was solved. When compiling the gsl library, we need to set the dependency of gsl to the cblas library. See this: https://github.com/bytedeco/javacpp/issues/55

Just add " GSL_LDFLAGS="-Lcblas/.libs/ -lgslcblas" " to the ./configure command.

在 2015年12月30日星期三 UTC+8上午2:33:57，shekmun写道：

I want to compile the gsl with ndk and use it on my android phone. And this is my steps: