Build Boost 1.70.0 By NDK r21e, product libthread libsystem size is unnormal

[khailifz]

We once had a colleague who submitted the compiled Android version of boost dynamic library in the code warehouse, but he resigned. Now we want to use the source code to compile it, and found that his version, regardless of the size of the thread library or system library, was compiled by myself. The difference is a lot, the following is the result of readelf

His boost lib

-rwxr-xr-x 1 root 6295760 Nov 28 16:01 libboost_thread-clang-mt-1_70.so

readelf -d libboost_thread-clang-mt-a64-1_70.so.1.70.0

Dynamic section at offset 0xdcbc0 contains 28 entries:
Tag Type Name/Value
0x0000000000000001 (NEEDED) Shared library: [libm.so]
0x0000000000000001 (NEEDED) Shared library: [libdl.so]
0x0000000000000001 (NEEDED) Shared library: [libc.so]
0x000000000000000e (SONAME) Library soname: [libboost_thread-clang-mt-a64-1_70.so.1.70.0]
0x0000000000000019 (INIT_ARRAY) 0xd6508
0x000000000000001b (INIT_ARRAYSZ) 16 (bytes)
0x000000000000001a (FINI_ARRAY) 0xd6518
0x000000000000001c (FINI_ARRAYSZ) 16 (bytes)
0x0000000000000004 (HASH) 0x1c8
0x000000006ffffef5 (GNU_HASH) 0x44a8
0x0000000000000005 (STRTAB) 0x15dd8
0x0000000000000006 (SYMTAB) 0x8d58
0x000000000000000a (STRSZ) 105438 (bytes)
0x000000000000000b (SYMENT) 24 (bytes)
0x0000000000000003 (PLTGOT) 0xdddc0
0x0000000000000002 (PLTRELSZ) 9288 (bytes)
0x0000000000000014 (PLTREL) RELA
0x0000000000000017 (JMPREL) 0x44bc8
0x0000000000000007 (RELA) 0x30b58
0x0000000000000008 (RELASZ) 82032 (bytes)
0x0000000000000009 (RELAENT) 24 (bytes)
0x000000000000001e (FLAGS) BIND_NOW
0x000000006ffffffb (FLAGS_1) Flags: NOW
0x000000006ffffffe (VERNEED) 0x30b18
0x000000006fffffff (VERNEEDNUM) 2
0x000000006ffffff0 (VERSYM) 0x2f9b6
0x000000006ffffff9 (RELACOUNT) 1421
0x0000000000000000 (NULL) 0x0

my boost lib

-rwxr-xr-x 1 root 1334544 May 14 09:07 libboost_thread-clang-mt-a64-1_70.so.1.70.0
$ readelf -d libboost_thread-clang-mt-a64-1_70.so.1.70.0
Dynamic section at offset 0x25878 contains 29 entries:
Tag Type Name/Value
0x0000000000000001 (NEEDED) Shared library: [libc++_shared.so]
0x0000000000000001 (NEEDED) Shared library: [libm.so]
0x0000000000000001 (NEEDED) Shared library: [libdl.so]
0x0000000000000001 (NEEDED) Shared library: [libc.so]
0x000000000000000e (SONAME) Library soname: [libboost_thread-clang-mt-a64-1_70.so.1.70.0]
0x0000000000000019 (INIT_ARRAY) 0x24ce8
0x000000000000001b (INIT_ARRAYSZ) 16 (bytes)
0x000000000000001a (FINI_ARRAY) 0x24cf8
0x000000000000001c (FINI_ARRAYSZ) 16 (bytes)
0x0000000000000004 (HASH) 0x1c8
0x000000006ffffef5 (GNU_HASH) 0xaa8
0x0000000000000005 (STRTAB) 0x2ca8
0x0000000000000006 (SYMTAB) 0x1040
0x000000000000000a (STRSZ) 11572 (bytes)
0x000000000000000b (SYMENT) 24 (bytes)
0x0000000000000003 (PLTGOT) 0x26a88
0x0000000000000002 (PLTRELSZ) 2640 (bytes)
0x0000000000000014 (PLTREL) RELA
0x0000000000000017 (JMPREL) 0x9f70
0x0000000000000007 (RELA) 0x5c80
0x0000000000000008 (RELASZ) 17136 (bytes)
0x0000000000000009 (RELAENT) 24 (bytes)
0x000000000000001e (FLAGS) BIND_NOW
0x000000006ffffffb (FLAGS_1) Flags: NOW
0x000000006ffffffe (VERNEED) 0x5c40
0x000000006fffffff (VERNEEDNUM) 2
0x000000006ffffff0 (VERSYM) 0x59dc
0x000000006ffffff9 (RELACOUNT) 399
0x0000000000000000 (NULL) 0x0

Boost Version: 1.70.0
NDK Version: r21e
Other modification: build-android.sh change link=static to link=shared

build command is
./build-android.sh /home/software/android_ndk/android-ndk-r21e --arch=arm64-v8a,armeabi-v7a --boost=1.70.0