# Dynamic\_cast on ARM Android **URL:** \ **Category:** GNU Radio\ **Created:** [July 11, 2011, 12:16pm UTC](https://www.ruby-forum.com/t/dynamic-cast-on-arm-android/209308 "2011-07-11T12:16:03Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![dubstep](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/cdc98d/32.png) [@dubstep](https://www.ruby-forum.com/u/dubstep)\ **Post date:** [July 11, 2011, 12:16pm UTC](https://www.ruby-forum.com/t/dynamic-cast-on-arm-android/209308/1 "2011-07-11T12:16:03Z")
Hi all, I tried to run gnuradio in order to decode DAB+ form a file on an ARM Cortex-A8 (OMAP 3) with Android. I translated the specific Python code to C++ and used gnu libstdc++ with boost. I connected the blocks using the method connect of gr\_hier\_block and gr\_top\_block. The result is SIGSEGV in dynamic\_cast when connecting blocks. The exact line should be: gnuradio-core/src/lib/runtime/gr\_sptr\_magic.cc:54: ``` gr_hier_block2 *hb2 = dynamic_cast(p); ``` Did you find such a problem before? How to solve it? My idea is to rewrite bock connections without dynamic\_cast. The exact gdb output is: 0x0036ab4a in \_\_cxxabiv1::\_\_dynamic\_cast (src\_ptr=0x3e0b80, src\_type=, dst\_type=0x3c9af0, src2dst=) at /tmp/ndk-digit/src/build/…/gcc/gcc-4.4.3/libstdc +±v3/libsupc++/dyncast.cc:47 47 /tmp/ndk-digit/src/build/…/gcc/gcc-4.4.3/libstdc+±v3/libsupc ++/dyncast.cc: No such file or directory. in /tmp/ndk-digit/src/build/…/gcc/gcc-4.4.3/libstdc+±v3/libsupc ++/dyncast.cc The backtrace is: (gdb) bt #0 0x0036ab4a in \_\_cxxabiv1::\_\_dynamic\_cast (src\_ptr=0x3e0b80, src\_type=, dst\_type=0x3c9af0, src2dst=) at /tmp/ndk-digit/src/build/…/gcc/gcc-4.4.3/libstdc +±v3/libsupc++/dyncast.cc:47 #1 0x000da704 in gnuradio::detail::sptr\_magic::fetch\_initial\_sptr (p=0x3e0b80) at /home/riadh/dev/p8/trunk/soft/Didon/Soft/Sources/gnuradio-core/src/lib/runtime/gr\_sptr\_magic.cc:54 #2 0x0002a824 in gnuradio::get\_initial\_sptr (p=0x3e0b80) at /home/riadh/dev/p8/trunk/soft/Didon/Soft/Sources/gnuradio-core/src/lib/runtime/gr\_sptr\_magic.h:47 #3 0x00028ce8 in dab\_make\_null\_detect (length=2656, debug=false) at /home/riadh/dev/p8/trunk/soft/Didon/Soft/Sources/python/detect\_null.cpp:25 #4 0x0001cfc0 in OfdmDemod::OfdmDemod (this=0x3dc408, dab\_params=0x3dc328, rx\_params=0x3dc3c0, verbose=true, debug=true) at /home/riadh/dev/p8/trunk/soft/Didon/Soft/Sources/python/ofdm.cpp:92 #5 0x00017474 in dab\_make\_ofdm\_demod (dab\_params=0x3dc328, rx\_params=0x3dc3c0, verbose=true, debug=true) at /home/riadh/dev/p8/trunk/soft/Didon/Soft/Sources/python/ofdm.cpp:24 #6 0x0000f878 in dab\_rx\_main () at /home/riadh/dev/p8/trunk/soft/Didon/Soft/Sources/python/dab\_rx\_constellation.cpp:93 #7 0x0000e780 in thread\_entry (data=0x0) at /home/riadh/dev/p8/trunk/soft/Didon/Soft/Sources/main/didon\_main.cpp:82 #8 0x00352584 in thread\_header (data=0x3d401c) at /home/riadh/dev/p8/trunk/soft/CommonSoft/ParrotOS/core/src/posix/posix\_thread.c:353 #9 0xafe0fe34 in \_\_thread\_entry (func=0x3523e8 \, arg=0x3d401c, tls=) at bionic/libc/bionic/pthread.c:188 #10 0xafe0f900 in pthread\_create (thread\_out=, attr=0x78, start\_routine=0x3523e8 \, arg=0x3d401c) at bionic/libc/bionic/pthread.c:324 #11 0x00000000 in ?? () Best reagrds, Riadh. ---
**Author:** ![Riadh\_Elloumi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/4491bb/32.png) [@Riadh\_Elloumi](https://www.ruby-forum.com/u/Riadh_Elloumi)\ **Post date:** [July 13, 2011, 10:45am UTC](https://www.ruby-forum.com/t/dynamic-cast-on-arm-android/209308/2 "2011-07-13T10:45:44Z")
Hi all, It was a bug of mine. I should have used self() for interconnecting blocks in gr\_hier\_block2 rather than gnuradio::get\_initial\_sptr (this). Best reagrds, Riadh.