generate signed apk error

Hi:

I have a build error when try to generate signed apk.
can you help me?

thank you very much.

the log information :+1:
------------------------------------------------------------------------
Build command failed.
Error while executing process /usr/local/bin/android-sdk-linux/cmake/3.6.3155560/bin/cmake with arguments {--build /home/jr/Codes/miner/android-cpuminer/bitzenymininglibrary/.externalNativeBuild/cmake/standardRelease/x86 --target bitzenymininglibrary}
[1/14] Building C object src/main/cpp/libcpuminer/CMakeFiles/cpuminer.dir/scrypt.c.o
[2/14] Building ASM object src/main/cpp/libcpuminer/CMakeFiles/cpuminer.dir/scrypt-arm.S.o
[3/14] Building ASM object src/main/cpp/libcpuminer/CMakeFiles/cpuminer.dir/scrypt-x64.S.o
[4/14] Building ASM object src/main/cpp/libcpuminer/CMakeFiles/cpuminer.dir/scrypt-x86.S.o
[5/14] Building C object src/main/cpp/libcpuminer/CMakeFiles/cpuminer.dir/sha2.c.o
[6/14] Building ASM object src/main/cpp/libcpuminer/CMakeFiles/cpuminer.dir/sha2-arm.S.o
[7/14] Building ASM object src/main/cpp/libcpuminer/CMakeFiles/cpuminer.dir/sha2-x64.S.o
[8/14] Building ASM object src/main/cpp/libcpuminer/CMakeFiles/cpuminer.dir/sha2-x86.S.o
[9/14] Building C object src/main/cpp/libcpuminer/CMakeFiles/cpuminer.dir/util.c.o
[10/14] Building C object src/main/cpp/libcpuminer/CMakeFiles/cpuminer.dir/yescrypt.c.o
[11/14] Building C object src/main/cpp/libcpuminer/CMakeFiles/cpuminer.dir/libcpuminer.c.o
In file included from /home/jr/Codes/miner/android-cpuminer/bitzenymininglibrary/src/main/cpp/libcpuminer/yescrypt.c:22:
In file included from /home/jr/Codes/miner/android-cpuminer/bitzenymininglibrary/src/main/cpp/libcpuminer/yescrypt-best.c:2:
/home/jr/Codes/miner/android-cpuminer/bitzenymininglibrary/src/main/cpp/libcpuminer/yescrypt-simd.c:43:2: warning: "Consider enabling SSE4.1, AVX, or XOP in the C compiler for significantly better performance" [-W#warnings]
#warning "Consider enabling SSE4.1, AVX, or XOP in the C compiler for significantly better performance"
^
1 warning generated.
[12/14] Linking C static library src/main/cpp/libcpuminer/libcpuminer.a
[13/14] Building CXX object CMakeFiles/bitzenymininglibrary.dir/src/main/cpp/bitzenymininglibrary.cpp.o
[14/14] Linking CXX shared library ../../../../build/intermediates/cmake/standard/release/obj/x86/libbitzenymininglibrary.so
FAILED: : && /usr/local/bin/android-sdk-linux/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ --target=i686-none-linux-android --gcc-toolchain=/usr/local/bin/android-sdk-linux/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64 --sysroot=/usr/local/bin/android-sdk-linux/ndk-bundle/sysroot -fPIC -isystem /usr/local/bin/android-sdk-linux/ndk-bundle/sysroot/usr/include/i686-linux-android -D__ANDROID_API__=21 -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -mstackrealign -Wa,--noexecstack -Wformat -Werror=format-security -std=c++11 -fexceptions -O2 -DNDEBUG -Wall -v -Wl,--no-warn-shared-textrel -shared -Wl,-soname,libbitzenymininglibrary.so -o ../../../../build/intermediates/cmake/standard/release/obj/x86/libbitzenymininglibrary.so CMakeFiles/bitzenymininglibrary.dir/src/main/cpp/bitzenymininglibrary.cpp.o /usr/local/bin/android-sdk-linux/ndk-bundle/platforms/android-21/arch-x86/usr/lib/liblog.so src/main/cpp/libcpuminer/libcpuminer.a ../../../../../distribution/curl/lib/x86/libcurl.a ../../../../../distribution/zlib/lib/x86/libz.a ../../../../../distribution/jansson/lib/x86/libjansson.a -latomic -lm "/usr/local/bin/android-sdk-linux/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/x86/libc++_static.a" "/usr/local/bin/android-sdk-linux/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/x86/libc++abi.a" && :
Android (4691093 based on r316199) clang version 6.0.2 (https://android.googlesource.com/toolchain/clang 183abd29fc496f55536e7d904e0abae47888fc7f) (https://android.googlesource.com/toolchain/llvm 34361f192e41ed6e4e8f9aca80a4ea7e9856f327) (based on LLVM 6.0.2svn)
Target: i686-none-linux-android
Thread model: posix
InstalledDir: /usr/local/bin/android-sdk-linux/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin
Found candidate GCC installation: /usr/local/bin/android-sdk-linux/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64/lib/gcc/i686-linux-android/4.9.x
Selected GCC installation: /usr/local/bin/android-sdk-linux/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64/lib/gcc/i686-linux-android/4.9.x
Candidate multilib: .;@m32
Selected multilib: .;@m32
clang++: warning: argument unused during compilation: '-Wa,--noexecstack' [-Wunused-command-line-argument]
"/usr/local/bin/android-sdk-linux/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin/ld" --sysroot=/usr/local/bin/android-sdk-linux/ndk-bundle/sysroot -z relro --eh-frame-hdr -m elf_i386 -shared -o ../../../../build/intermediates/cmake/standard/release/obj/x86/libbitzenymininglibrary.so crtbegin_so.o -L/usr/local/bin/android-sdk-linux/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/lib64/clang/6.0.2/lib/linux/i386 -L/usr/local/bin/android-sdk-linux/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64/lib/gcc/i686-linux-android/4.9.x -L/usr/local/bin/android-sdk-linux/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/lib -L/usr/local/bin/android-sdk-linux/ndk-bundle/sysroot/usr/lib --no-warn-shared-textrel -soname libbitzenymininglibrary.so CMakeFiles/bitzenymininglibrary.dir/src/main/cpp/bitzenymininglibrary.cpp.o /usr/local/bin/android-sdk-linux/ndk-bundle/platforms/android-21/arch-x86/usr/lib/liblog.so src/main/cpp/libcpuminer/libcpuminer.a ../../../../../distribution/curl/lib/x86/libcurl.a ../../../../../distribution/zlib/lib/x86/libz.a ../../../../../distribution/jansson/lib/x86/libjansson.a -latomic -lm /usr/local/bin/android-sdk-linux/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/x86/libc++_static.a /usr/local/bin/android-sdk-linux/ndk-bundle/sources/cxx-stl/llvm-libc++/libs/x86/libc++abi.a -lstdc++ -lm -lgcc -ldl -lc -lgcc -ldl crtend_so.o
/usr/local/bin/android-sdk-linux/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin/ld: error: cannot open crtbegin_so.o: no file or directory
/usr/local/bin/android-sdk-linux/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin/ld: error: cannot open crtend_so.o: no file or directory
/usr/local/bin/android-sdk-linux/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin/ld: error: cannot find -lm
/usr/local/bin/android-sdk-linux/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin/ld: error: cannot find -lstdc++
/usr/local/bin/android-sdk-linux/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin/ld: error: cannot find -lm
/usr/local/bin/android-sdk-linux/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin/ld: error: cannot find -ldl
/usr/local/bin/android-sdk-linux/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin/ld: error: cannot find -lc
/usr/local/bin/android-sdk-linux/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin/ld: error: cannot find -ldl
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.