EDIT 3我能够使用 NDK r6b 重现 10KB hello-jni 二进制文件。我发现了一个可怕的黑客here http://embdev.net/topic/201054。基本上将这一行放入您的文件之一中：
char __aeabi_unwind_cpp_pr0[0];
但是你的代码将缺乏异常处理（我认为这是重点-fno-exceptions....)
无论如何，这使 libhello-jni.so 对我来说减少到了 2228 字节。仍然比 r5c 大，但比 10KB 小很多。
EDIT 2是的，您的 readelf 输出中似乎有很多与 C++ 相关的开销。也许他们在 r5c 和 r6b 之间做了一些改变？ r5c的hello-jni.c中没有C++代码。
我有 160 行 C 代码，NDK r5c 将其缩减为 3.8KB .so。请尝试以下操作来查看造成大小的原因：
/path/to/ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/<platform>/bin/arm-linux-androideabi-readelf -a libmylib.so
EDIT我使用 NDK r5c 构建了 hello-jni 示例以及生成的结果libhello-jni.so文件大小为 1588 字节。
构建命令：
ndk-build V=1
构建输出：http://pastebin.com/AdRDVbnF http://pastebin.com/AdRDVbnF（显然 SO 对行长度或其他东西有限制）。
输出来自readelf -a libhello-jni.so:
ELF Header:
Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: DYN (Shared object file)
Machine: ARM
Version: 0x1
Entry point address: 0x2dc
Start of program headers: 52 (bytes into file)
Start of section headers: 1108 (bytes into file)
Flags: 0x5000002, has entry point, Version5 EABI
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 5
Size of section headers: 40 (bytes)
Number of section headers: 12
Section header string table index: 11
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .hash HASH 000000d4 0000d4 00004c 04 A 2 0 4
[ 2] .dynsym DYNSYM 00000120 000120 0000e0 10 A 3 2 4
[ 3] .dynstr STRTAB 00000200 000200 0000db 00 A 0 0 1
[ 4] .text PROGBITS 000002dc 0002dc 00002c 00 AX 0 0 4
[ 5] .rodata PROGBITS 00000308 000308 000014 00 A 0 0 4
[ 6] .ARM.exidx ARM_EXIDX 0000031c 00031c 000008 00 AL 4 0 4
[ 7] .dynamic DYNAMIC 00001324 000324 000088 08 WA 3 0 4
[ 8] .got PROGBITS 000013ac 0003ac 00000c 04 WA 0 0 4
[ 9] .comment PROGBITS 00000000 0003b8 000012 00 0 0 1
[10] .ARM.attributes ARM_ATTRIBUTES 00000000 0003ca 000029 00 0 0 1
[11] .shstrtab STRTAB 00000000 0003f3 000061 00 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
I (info), L (link order), G (group), x (unknown)
O (extra OS processing required) o (OS specific), p (processor specific)
There are no section groups in this file.
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
EXIDX 0x00031c 0x0000031c 0x0000031c 0x00008 0x00008 R 0x4
LOAD 0x000000 0x00000000 0x00000000 0x00324 0x00324 R E 0x1000
LOAD 0x000324 0x00001324 0x00001324 0x00094 0x00094 RW 0x1000
DYNAMIC 0x000324 0x00001324 0x00001324 0x00088 0x00088 RW 0x4
GNU_STACK 0x000000 0x00000000 0x00000000 0x00000 0x00000 RW 0x4
Section to Segment mapping:
Segment Sections...
00 .ARM.exidx
01 .hash .dynsym .dynstr .text .rodata .ARM.exidx
02 .dynamic .got
03 .dynamic
04
Dynamic section at offset 0x324 contains 12 entries:
Tag Type Name/Value
0x00000001 (NEEDED) Shared library: [libc.so]
0x00000001 (NEEDED) Shared library: [libstdc++.so]
0x00000001 (NEEDED) Shared library: [libm.so]
0x00000001 (NEEDED) Shared library: [libdl.so]
0x0000000e (SONAME) Library soname: [libhello-jni.so]
0x00000010 (SYMBOLIC) 0x0
0x00000004 (HASH) 0xd4
0x00000005 (STRTAB) 0x200
0x00000006 (SYMTAB) 0x120
0x0000000a (STRSZ) 219 (bytes)
0x0000000b (SYMENT) 16 (bytes)
0x00000000 (NULL) 0x0
There are no relocations in this file.
There are no unwind sections in this file.
Symbol table '.dynsym' contains 14 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 00000000 0 NOTYPE LOCAL DEFAULT UND
1: 000002dc 0 SECTION LOCAL DEFAULT 4
2: 00000324 0 NOTYPE GLOBAL DEFAULT ABS __exidx_end
3: 00000000 0 FUNC GLOBAL DEFAULT UND __aeabi_unwind_cpp_pr0
4: 000013b8 0 NOTYPE GLOBAL DEFAULT ABS _bss_end__
5: 000013b8 0 NOTYPE GLOBAL DEFAULT ABS __bss_start__
6: 0000031c 0 NOTYPE GLOBAL DEFAULT ABS __exidx_start
7: 000013b8 0 NOTYPE GLOBAL DEFAULT ABS __bss_end__
8: 000013b8 0 NOTYPE GLOBAL DEFAULT ABS __bss_start
9: 000013b8 0 NOTYPE GLOBAL DEFAULT ABS __end__
10: 000002dd 44 FUNC GLOBAL DEFAULT 4 Java_com_example_hellojni
11: 000013b8 0 NOTYPE GLOBAL DEFAULT ABS _edata
12: 000013b8 0 NOTYPE GLOBAL DEFAULT ABS _end
13: 000013b8 0 NOTYPE GLOBAL DEFAULT 8 __data_start
Histogram for bucket list length (total of 3 buckets):
Length Number % of total Coverage
0 0 ( 0.0%)
1 0 ( 0.0%) 0.0%
2 1 ( 33.3%) 16.7%
3 0 ( 0.0%) 16.7%
4 1 ( 33.3%) 50.0%
5 0 ( 0.0%) 50.0%
6 1 ( 33.3%) 100.0%
No version information found in this file.
Attribute Section: aeabi
File Attributes
Tag_CPU_name: "5TE"
Tag_CPU_arch: v5TE
Tag_THUMB_ISA_use: Thumb-1
Tag_ABI_PCS_wchar_t: 4
Tag_ABI_FP_denormal: Needed
Tag_ABI_FP_exceptions: Needed
Tag_ABI_FP_number_model: IEEE 754
Tag_ABI_align8_needed: Yes
Tag_ABI_align8_preserved: Yes, except leaf SP
Tag_ABI_enum_size: int
Tag_ABI_optimization_goals: Aggressive Debug
