Android Studio NDK编译报错requires unsupported dynamic reloc R_ARM_REL32； recompile with -fPIC

报错信息：

[78/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/lasquadtree.cpp.o
[79/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/lasinterval.cpp.o
[80/82] Linking CXX shared library E:\work\projects\LivoxLiDAR\livoxsdk\build\intermediates\cmake\debug\obj\armeabi-v7a\libLASlib.so
[81/82] Linking CXX shared library E:\work\projects\LivoxLiDAR\livoxsdk\build\intermediates\cmake\debug\obj\armeabi-v7a\libLidarApp.so
FAILED: E:/work/projects/LivoxLiDAR/livoxsdk/build/intermediates/cmake/debug/obj/armeabi-v7a/libLidarApp.so
cmd.exe /C "cd . && D:\Android\AndroidSdk\ndk\21.4.7075529\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe --target=armv7-none-linux-androideabi24 --gcc-toolchain=D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64 --sysroot=D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/sysroot -fPIC -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -D_FORTIFY_SOURCE=2 -march=armv7-a -mthumb -Wformat -Werror=format-security  -std=c++11 -fPIC -pthread -fPIC -O0 -fno-limit-debug-info  -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libgcc_real.a -Wl,--exclude-libs,libatomic.a -static-libstdc++ -Wl,--build-id -Wl,--fatal-warnings -Wl,--exclude-libs,libunwind.a -Wl,--no-undefined -Qunused-arguments -shared -Wl,-soname,libLidarApp.so -o E:\work\projects\LivoxLiDAR\livoxsdk\build\intermediates\cmake\debug\obj\armeabi-v7a\libLidarApp.so lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o  E:/work/projects/LivoxLiDAR/livoxsdk/build/intermediates/cmake/debug/obj/armeabi-v7a/liblivoxsdk.so E:/work/projects/LivoxLiDAR/livoxsdk/build/intermediates/cmake/debug/obj/armeabi-v7a/libLASlib.so -landroid -llog -latomic -lm && cd ."
D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: warning: shared library text segment is not shareable
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
[82/82] Linking CXX executable lidarapp\lidarapp
ninja: build stopped: subcommand failed.

> Task :livoxsdk:externalNativeBuildDebug FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':livoxsdk:externalNativeBuildDebug'.
> Build command failed.
  Error while executing process D:\Android\AndroidSdk\cmake\3.10.2.4988404\bin\ninja.exe with arguments {-C E:\work\projects\LivoxLiDAR\livoxsdk\.cxx\cmake\debug\armeabi-v7a LASlib LidarApp lidarapp livoxsdk}
  ninja: Entering directory `E:\work\projects\LivoxLiDAR\livoxsdk\.cxx\cmake\debug\armeabi-v7a'
  [1/82] Building CXX object CMakeFiles/livoxsdk.dir/src/base/network/unix/network_util.cpp.o
  [2/82] Building CXX object CMakeFiles/livoxsdk.dir/src/comm/comm_port.cpp.o
  [3/82] Building CXX object CMakeFiles/livoxsdk.dir/src/command_handler/hub_command_handler.cpp.o
  [4/82] Building CXX object CMakeFiles/livoxsdk.dir/src/comm/sdk_protocol.cpp.o
  [5/82] Building CXX object CMakeFiles/livoxsdk.dir/src/livox_sdk.cpp.o
  [6/82] Building CXX object CMakeFiles/livoxsdk.dir/src/device_manager.cpp.o
  [7/82] Building CXX object CMakeFiles/livoxsdk.dir/src/data_handler/hub_data_handler.cpp.o
  [8/82] Building CXX object CMakeFiles/livoxsdk.dir/src/base/logging.cpp.o
  [9/82] Building CXX object CMakeFiles/livoxsdk.dir/src/data_handler/lidar_data_handler.cpp.o
  [10/82] Building CXX object CMakeFiles/livoxsdk.dir/src/third_party/FastCRC/FastCRCsw.cpp.o
  [11/82] Building CXX object CMakeFiles/livoxsdk.dir/src/device_discovery.cpp.o
  [12/82] Building CXX object CMakeFiles/livoxsdk.dir/src/data_handler/data_handler.cpp.o
  [13/82] Building CXX object CMakeFiles/livoxsdk.dir/src/base/thread_base.cpp.o
  [14/82] Building CXX object CMakeFiles/livoxsdk.dir/src/base/io_thread.cpp.o
  [15/82] Building CXX object CMakeFiles/livoxsdk.dir/src/command_handler/command_handler.cpp.o
  [16/82] Building CXX object CMakeFiles/livoxsdk.dir/src/command_handler/lidar_command_handler.cpp.o
  [17/82] Building CXX object CMakeFiles/livoxsdk.dir/src/base/multiple_io/multiple_io_base.cpp.o
  [18/82] Building CXX object CMakeFiles/livoxsdk.dir/src/command_handler/command_impl.cpp.o
  [19/82] Building CXX object CMakeFiles/livoxsdk.dir/src/command_handler/command_channel.cpp.o
  [20/82] Building CXX object CMakeFiles/livoxsdk.dir/src/base/multiple_io/multiple_io_epoll.cpp.o
  [21/82] Building CXX object CMakeFiles/livoxsdk.dir/src/base/wake_up/unix/wake_up_pipe.cpp.o
  [22/82] Building CXX object CMakeFiles/livoxsdk.dir/src/base/multiple_io/multiple_io_select.cpp.o
  [23/82] Building CXX object CMakeFiles/livoxsdk.dir/src/base/multiple_io/multiple_io_poll.cpp.o
  [24/82] Building CXX object CMakeFiles/livoxsdk.dir/src/base/multiple_io/multiple_io_kqueue.cpp.o
  [25/82] Building CXX object lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o
  [26/82] Building CXX object CMakeFiles/livoxsdk.dir/src/base/io_loop.cpp.o
  [27/82] Building CXX object CMakeFiles/livoxsdk.dir/jnijavacpp.cpp.o
  [28/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/lasignore.cpp.o
  [29/82] Building CXX object lidarapp/CMakeFiles/lidarapp.dir/main.cpp.o
  [30/82] Building CXX object lidarapp/CMakeFiles/lidarapp.dir/lds_lidar.cpp.o
  [31/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/lasreader_bin.cpp.o
  [32/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/laswriter.cpp.o
  [33/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/lasreader.cpp.o
  [34/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/lasreader_shp.cpp.o
  [35/82] Building CXX object CMakeFiles/livoxsdk.dir/livoxsdk.cpp.o
  [36/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/lasreader_asc.cpp.o
  [37/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/lasreader_dtm.cpp.o
  [38/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/lasreader_bil.cpp.o
  [39/82] Linking CXX shared library E:\work\projects\LivoxLiDAR\livoxsdk\build\intermediates\cmake\debug\obj\armeabi-v7a\liblivoxsdk.so
  [40/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/lasreader_ply.cpp.o
  [41/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/lasreader_qfit.cpp.o
  [42/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/lasreader_las.cpp.o
  [43/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/lasreader_txt.cpp.o
  [44/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/lasreaderbuffered.cpp.o
  [45/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/laswriter_bin.cpp.o
  [46/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/laswriter_wrl.cpp.o
  [47/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/laswriter_qfit.cpp.o
  [48/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/lasreaderstored.cpp.o
  [49/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/lasreaderpipeon.cpp.o
  [50/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/lasreadermerged.cpp.o
  [51/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/laswriter_txt.cpp.o
  [52/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/laswritercompatible.cpp.o
  [53/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/laswaveform13reader.cpp.o
  [54/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/laswaveform13writer.cpp.o
  [55/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/fopen_compressed.cpp.o
  [56/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/laswriter_las.cpp.o
  [57/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/lasutility.cpp.o
  [58/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/lasreadpoint.cpp.o
  [59/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/lasreaditemcompressed_v2.cpp.o
  [60/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/laskdtree.cpp.o
  [61/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/lasreaditemcompressed_v1.cpp.o
  [62/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/lasreaditemcompressed_v3.cpp.o
  [63/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/laswriteitemcompressed_v2.cpp.o
  [64/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/laswritepoint.cpp.o
  [65/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/laswriteitemcompressed_v1.cpp.o
  [66/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/lasreaditemcompressed_v4.cpp.o
  [67/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/lasfilter.cpp.o
  [68/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/arithmeticdecoder.cpp.o
  [69/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/integercompressor.cpp.o
  [70/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/laswriteitemcompressed_v3.cpp.o
  [71/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/lastransform.cpp.o
  E:/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASlib/src/lastransform.cpp:805:149: warning: multi-character character constant [-Wmultichar]
    inline I32 get_command(CHAR* string) const { return sprintf(string, "-%s%c %u ", name(), (rgbi == 0 ? 'R' : (rgbi == 1 ? 'G' : (rgbi == 2 ? 'B' : 'NIR'))), index); };
                                                                                                                                                      ^
  E:/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASlib/src/lastransform.cpp:1083:149: warning: multi-character character constant [-Wmultichar]
    inline I32 get_command(CHAR* string) const { return sprintf(string, "-%s%c %u ", name(), (rgbi == 0 ? 'R' : (rgbi == 1 ? 'G' : (rgbi == 2 ? 'B' : 'NIR'))), index); };
                                                                                                                                                      ^
  2 warnings generated.
  [72/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/arithmeticencoder.cpp.o
  [73/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/laswriteitemcompressed_v4.cpp.o
  [74/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/arithmeticmodel.cpp.o
  [75/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/mydefs.cpp.o
  [76/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/laszip.cpp.o
  [77/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/lasindex.cpp.o
  [78/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/lasquadtree.cpp.o
  [79/82] Building CXX object lidarapp/LASlib_output_dir/CMakeFiles/LASlib.dir/E_/work/projects/LivoxLiDAR/lastools/src/main/cpp/LASzip/src/lasinterval.cpp.o
  [80/82] Linking CXX shared library E:\work\projects\LivoxLiDAR\livoxsdk\build\intermediates\cmake\debug\obj\armeabi-v7a\libLASlib.so
  [81/82] Linking CXX shared library E:\work\projects\LivoxLiDAR\livoxsdk\build\intermediates\cmake\debug\obj\armeabi-v7a\libLidarApp.so
  FAILED: E:/work/projects/LivoxLiDAR/livoxsdk/build/intermediates/cmake/debug/obj/armeabi-v7a/libLidarApp.so
  cmd.exe /C "cd . && D:\Android\AndroidSdk\ndk\21.4.7075529\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe --target=armv7-none-linux-androideabi24 --gcc-toolchain=D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64 --sysroot=D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/sysroot -fPIC -g -DANDROID -fdata-sections -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -D_FORTIFY_SOURCE=2 -march=armv7-a -mthumb -Wformat -Werror=format-security  -std=c++11 -fPIC -pthread -fPIC -O0 -fno-limit-debug-info  -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libgcc_real.a -Wl,--exclude-libs,libatomic.a -static-libstdc++ -Wl,--build-id -Wl,--fatal-warnings -Wl,--exclude-libs,libunwind.a -Wl,--no-undefined -Qunused-arguments -shared -Wl,-soname,libLidarApp.so -o E:\work\projects\LivoxLiDAR\livoxsdk\build\intermediates\cmake\debug\obj\armeabi-v7a\libLidarApp.so lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o  E:/work/projects/LivoxLiDAR/livoxsdk/build/intermediates/cmake/debug/obj/armeabi-v7a/liblivoxsdk.so E:/work/projects/LivoxLiDAR/livoxsdk/build/intermediates/cmake/debug/obj/armeabi-v7a/libLASlib.so -landroid -llog -latomic -lm && cd ."
  D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
  D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
  D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
  D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
  D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
  D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
  D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
  D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
  D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
  D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
  D:/Android/AndroidSdk/ndk/21.4.7075529/toolchains/llvm/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin\ld: warning: shared library text segment is not shareable
  clang++: error: linker command failed with exit code 1 (use -v to see invocation)
  [82/82] Linking CXX executable lidarapp\lidarapp
  ninja: build stopped: subcommand failed.
 

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BUILD FAILED in 14s
34 actionable tasks: 32 executed, 2 up-to-date

按照提示，试了所有的加-fPIC编译选项的方法，还是不行，包括在build.gradle中加cppFlags，在CMakeLists.txt中设置：

set_property(TARGET ${MY_LIBRARY} PROPERTY POSITION_INDEPENDENT_CODE ON)

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")

最后证明都不行。

CMakeLists.txt是这样的：

cmake_minimum_required(VERSION 3.0)

set(DEMO_NAME lidarapp)

set(TOP_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../../../..)
add_subdirectory(
        ${TOP_DIR}/lastools/src/main/cpp/LASlib/src
        LASlib_output_dir
)

add_executable(${DEMO_NAME} main.cpp lds_lidar.cpp)

# 引用LASlib文件头
include_directories(
        ${TOP_DIR}/lastools/src/main/cpp/LASzip/src
        ${TOP_DIR}/lastools/src/main/cpp/LASlib/inc
)
#target_include_directories(${DEMO_NAME}
#        PUBLIC
#        ${TOP_DIR}/lastools/src/main/cpp/LASzip/src
#        ${TOP_DIR}/lastools/src/main/cpp/LASlib/inc
#        )


target_link_libraries(${DEMO_NAME}
        PRIVATE
        livoxsdk #${PROJECT_NAME} # livoxsdk
        LASlib
        android
        log
        )

# 开始定义动态库libLidarApp.so
set(MY_LIBRARY LidarApp)
# 调试输出详细信息
set(CMAKE_VERBOSE_MAKEFILE ON)

# 动态库和可执行程序的差别就在于少了一个main.cpp
add_library(${MY_LIBRARY} SHARED lds_lidar.cpp)
set_property(TARGET ${MY_LIBRARY} PROPERTY POSITION_INDEPENDENT_CODE ON)

set(CMAKE_CXX_STANDARD 11)
# arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")

target_include_directories(${MY_LIBRARY}
        PUBLIC
        ${TOP_DIR}/lastools/src/main/cpp/LASzip/src
        ${TOP_DIR}/lastools/src/main/cpp/LASlib/inc
        )

# 这个库架构于livoxsdk和LASlib两个库之上
target_link_libraries(${MY_LIBRARY}
        PRIVATE
        livoxsdk
        LASlib
        android
        log
        )

最后经同事提示，在编译so的时候另起一个小文件hello.cpp试试，开始是lds_lidar.cpp只保留了头文件引用和变量声明，结果发现可以编译了，然后一点点加代码，加到最后全部相同了，还是可以。怀疑是文件命名的原因，遂把文件名改了，后来发现又不行了。然后恍悟，应该是同时编译可执行文件和动态链接库的原因，遂注掉上面可执行程序部分，单独编译so库，发现可以了！

加了个条件编译，CMakeLists.txt变这样了：

cmake_minimum_required(VERSION 3.5 FATAL_ERROR)

set(BUILD_EXECUTABLE OFF)
message(编译选项 BUILD_EXECUTABLE=${BUILD_EXECUTABLE})

set(TOP_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../../../..)
add_subdirectory(
        ${TOP_DIR}/lastools/src/main/cpp/LASlib/src
        LASlib_output_dir
)

if (${BUILD_EXECUTABLE})

    set(DEMO_NAME lidarapp)

    add_executable(${DEMO_NAME} main.cpp lds_lidar.cpp)

    # 引用LASlib文件头
    include_directories(
            ${TOP_DIR}/lastools/src/main/cpp/LASzip/src
            ${TOP_DIR}/lastools/src/main/cpp/LASlib/inc
    )
    #target_include_directories(${DEMO_NAME}
    #        PUBLIC
    #        ${TOP_DIR}/lastools/src/main/cpp/LASzip/src
    #        ${TOP_DIR}/lastools/src/main/cpp/LASlib/inc
    #        )


    target_link_libraries(${DEMO_NAME}
            PRIVATE
            livoxsdk #${PROJECT_NAME} # livoxsdk
            LASlib
            android
            log
            )

else ()

    # so不能和上面的可执行程序同时编译，否则编译so时会报错如下：
    # arm-linux-androideabi/bin\ld: error: lidarapp/CMakeFiles/LidarApp.dir/lds_lidar.cpp.o: requires unsupported dynamic reloc R_ARM_REL32; recompile with -fPIC
    # 开始定义动态库libLidarApp.so
    set(MY_LIBRARY LidarApp)
    # 调试输出详细信息
    set(CMAKE_VERBOSE_MAKEFILE ON)

    # 动态库和可执行程序的差别就在于少了一个main.cpp
    add_library(${MY_LIBRARY} SHARED lds_lidar.cpp)
    #set_property(TARGET ${MY_LIBRARY} PROPERTY POSITION_INDEPENDENT_CODE ON)

    set(CMAKE_CXX_STANDARD 11)

    target_include_directories(${MY_LIBRARY}
            PUBLIC
            ${TOP_DIR}/lastools/src/main/cpp/LASzip/src
            ${TOP_DIR}/lastools/src/main/cpp/LASlib/inc
            )

    # 这个库架构于livoxsdk和LASlib两个库之上
    target_link_libraries(${MY_LIBRARY}
            PRIVATE
            livoxsdk
            LASlib
            android
            log
            )

endif ()

知道的能说说这是CMake的bug还是NDK的bug，还是我用得不对？