On Monday, January 4, 2016 at 3:51:07 PM UTC-5, Jeffrey Walton wrote:
>
> > I have two sets of issues. One seems to be linker related:
> >
> > E/art ( 8857): dlopen("/data/app/com.app/lib/arm/libcryptopp-and.so",
> > RTLD_LAZY) failed: dlopen failed: library "libstlport_shared.so" not
> found
> >
> > So I add:
> >
> > ANDROID_EXTRA_LIBS +=
> /Users/jhihn/Downloads/android-ndk-r10e/sources/cxx-stl/
> > stlport/libs/armeabi-v7a/libstlport_shared.so
> >
>
> This is always a point of frustration (for me)... How to get the libraries
> copied properly and in the right place in the lib/ folder. Under NDK-build,
> you use LOCAL_MODULE and LOCAL_SHARED_LIBRARIES. One ensures you
> compile/link against a library like stlport_shared, the other ensures
> stlport_shared is included in the libs/ directory.
>
> Also see this Android.mk:
> http://github.com/noloader/Android-PRNG/blob/master/jni/Android.mk. It
> produces a prng.so called by Java, and it uses stlport_shared.so and
> cryptopp.so.
>
> I’m not sure how Qt does things.
>
> *****
>
> Also note that getting the dlopen flags correct can be challenging. I use
> the following code (when needed) code because something that works on one
> platform does not work on another (from
> http://cryptopp.com/wiki/Linux#Note_for_Shared_Object_Callers):
>
> void* cryptlib = NULL;
>
> cryptlib = dlopen("libcryptopp.so", RTLD_GLOBAL);
>
> if(!cryptlib)
> cryptlib = dlopen("libcryptopp.so", RTLD_GLOBAL | RTLD_LAZY);
>
> if(!cryptlib)
> cryptlib = dlopen("libcrypto++.so", RTLD_GLOBAL);
>
> if(!cryptlib)
> cryptlib = dlopen("libcrypto++.so", RTLD_GLOBAL | RTLD_LAZY);
>
> if(!cryptlib)
> throw runtime_error("Failed to load crypto++ shared object");
>
> ...
>
> dlclose(cryptlib);
>
>
> I think you figured it out for me, I need RTLD_GLOBAL in the dlopen()
qt-generated android activity to load the library so that crypto++ can
access it. Be default it is only specifying RTLD_LAZY
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