libz.a for armv7a missing symbols

[ghost]

while compiling static binary with armv7a clang, facing some linker error regarding libz.a
cause of missing symbol

More details and probable fix can be found in this issue by topjohnwu: android/ndk#1391

in my case output:

root@kali:~/dump_source/simg2img# make  
              /root/android-ndk-r22/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi30-clang++ -std=gnu++17 -O2 -W -Wall -Werror -Wextra -ffunction-sections -O3 -D__STDC_FORMAT_MACROS -D__STDC_CONSTANT_MACROS -Iinclude -Iandroid-base/include -c backed_block.cpp -o backed_block.o                                         /root/android-ndk-r22/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi30-clang++ -std=gnu++17 -O2 -W -Wall -Werror -Wextra -ffunction-sections -O3 -D__STDC_FORMAT_MACROS -D__STDC_CONSTANT_MACROS -Iinclude -Iandroid-base/include -c output_file.cpp -o output_file.o
/root/android-ndk-r22/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi30-clang++ -std=gnu++17 -O2 -W -Wall -Werror -Wextra -ffunction-sections -O3 -D__STDC_FORMAT_MACROS -D__STDC_CONSTANT_MACROS -Iinclude -Iandroid-base/include -c sparse.cpp -o sparse.o
/root/android-ndk-r22/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi30-clang++ -std=gnu++17 -O2 -W -Wall -Werror -Wextra -ffunction-sections -O3 -D__STDC_FORMAT_MACROS -D__STDC_CONSTANT_MACROS -Iinclude -Iandroid-base/include -c sparse_crc32.cpp -o sparse_crc32.o
/root/android-ndk-r22/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi30-clang++ -std=gnu++17 -O2 -W -Wall -Werror -Wextra -ffunction-sections -O3 -D__STDC_FORMAT_MACROS -D__STDC_CONSTANT_MACROS -Iinclude -Iandroid-base/include -c sparse_err.cpp -o sparse_err.o
/root/android-ndk-r22/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi30-clang++ -std=gnu++17 -O2 -W -Wall -Werror -Wextra -ffunction-sections -O3 -D__STDC_FORMAT_MACROS -D__STDC_CONSTANT_MACROS -Iinclude -Iandroid-base/include -c sparse_read.cpp -o sparse_read.o
/root/android-ndk-r22/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi30-clang++ -std=gnu++17 -O2 -W -Wall -Werror -Wextra -ffunction-sections -O3 -D__STDC_FORMAT_MACROS -D__STDC_CONSTANT_MACROS -Iinclude -Iandroid-base/include -c android-base/stringprintf.cpp -o android-base/stringprintf.o
/root/android-ndk-r22/toolchains/llvm/prebuilt/linux-x86_64/bin/arm-linux-androideabi-ar rc libsparse.a backed_block.o output_file.o sparse.o sparse_crc32.o sparse_err.o sparse_read.o android-base/stringprintf.o
/root/android-ndk-r22/toolchains/llvm/prebuilt/linux-x86_64/bin/arm-linux-androideabi-ranlib libsparse.a
/root/android-ndk-r22/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi30-clang++ -std=gnu++17 -O2 -W -Wall -Werror -Wextra -ffunction-sections -O3 -D__STDC_FORMAT_MACROS -D__STDC_CONSTANT_MACROS -Iinclude -Iandroid-base/include -o simg2img simg2img.cpp -L. -lsparse -lm -lz -Wl,--gc-sections -s -static
/root/android-ndk-r22/toolchains/llvm/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld: /root/android-ndk-r22/toolchains/llvm/prebuilt/linux-x86_64/bin/../sysroot/usr/lib/arm-linux-androideabi/30/libz.a(deflate.o): in function `deflateInit2_':
external/zlib/deflate.c:(.text.deflateInit2_+0x200): undefined reference to `arm_cpu_enable_crc32'
/root/android-ndk-r22/toolchains/llvm/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld: external/zlib/deflate.c:(.text.deflateInit2_+0x204): undefined reference to `x86_cpu_enable_simd'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [Makefile:85: simg2img] Error 1

[lzhiyong]

The libz.a of armv7a lacks cpu_features.o and needs to be updated to r22b or above

[ghost]

The libz.a of armv7a lacks cpu_features.o and needs to be updated to r22b or above

I don't have pc and my mobile is not that great to compile the whole ndk.If you have time, can you fix it?

[lzhiyong]

Google has not released ndk-r22b, please wait for the r22b version to be released.

[ghost]

Google has not released ndk-r22b, please wait for the r22b version to be released.
i did not know.Thanks for the info.Closing the issue for now

[ghost]

Google has not released ndk-r22b, please wait for the r22b version to be released.

By the way, i have fixed it in your current ndk release in r22