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https://github.com/leaking/compileandlink
https://github.com/leaking/compileandlink
Last synced: 3 days ago
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- Host: GitHub
- URL: https://github.com/leaking/compileandlink
- Owner: Leaking
- License: mit
- Created: 2022-03-17T09:17:29.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2022-03-18T07:32:25.000Z (over 2 years ago)
- Last Synced: 2024-10-11T20:11:10.441Z (about 1 month ago)
- Language: C++
- Size: 4.88 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# CompileAndLink
## create static lib
ar rc libmain.a main.o work.o
## create dylib
g++ -shared layer.o conflict.o -o libconflict.so
g++ -s -L. -o main -lmain -lconflict
g++ -Wl,--version-script=export.txt -shared layer.o conflict.o -o libconflict.so
## hidden
g++ -fvisibility=hidden -c ../conflict.cc -o conflict.o
hidde之后，符号类型为t
```
➜ build git:(main) ✗ nm libconflict.so
0000000000003f60 t __Z7DoLayerv
0000000000003f80 t __Z7DoThingv
U _printf
```
gcc -Wl, --version-script export.txt -shared layer.o conflict.o -o libconflict.so
clang 不支持 --version-script
nm中
T是公开而且实现的函数
t则是hide的接口
执行以下命令
```
➜ build git:(main) ✗ g++ -c ../main.cc -o main.o
➜ build git:(main) ✗ g++ -c ../work.cc -o work.o
➜ build git:(main) ✗ g++ -c ../conflict.cc -o conflict.o
➜ build git:(main) ✗ g++ -c ../layer.cc -o layer.o
➜ build git:(main) ✗ ar rc libmain.a main.o work.o
➜ build git:(main) ✗ g++ -shared layer.o conflict.o -o libconflict.so
➜ build git:(main) ✗ g++ -s -L. -o main -lmain -lconflict
```
## linux的表现
```
start
work
layer
work
finished
```
```
// 隐藏符号后
ubuntu@VM-0-2-ubuntu:~/workspace/CompileAndLink/sample1/build$ g++ -fPIC -fvisibility=hidden -c ../conflict.cc -o conflict.o
ubuntu@VM-0-2-ubuntu:~/workspace/CompileAndLink/sample1/build$ g++ -shared layer.o conflict.o -o libconflict.so
ubuntu@VM-0-2-ubuntu:~/workspace/CompileAndLink/sample1/build$ g++ -s -L. -o main -lmain -lconflict
ubuntu@VM-0-2-ubuntu:~/workspace/CompileAndLink/sample1/build$ ./main
start
work
layer
conflict
finished
```
```
// linux 先修改main和conflict的链接顺序，会报错，Mac则不会
ubuntu@VM-0-2-ubuntu:~/workspace/CompileAndLink/sample1/build$ g++ -s -L. -o main -lconflict -lmain
./libmain.a(main.o): In function `main':
main.cc:(.text+0x14): undefined reference to `DoLayer()'
collect2: error: ld returned 1 exit status
```
## mac的表现
```
➜ build git:(main) ✗ g++ -s -L. -o main -lmain -lconflict
➜ build git:(main) ✗ ./main
start
work
layer
conflict
finished
```
```
➜ build git:(main) ✗ g++ -s -L. -o main -lconflict -lmain
➜ build git:(main) ✗ ./main
start
conflict
layer
conflict
finished
```
```
➜ build git:(main) ✗ g++ -fvisibility=hidden -c ../conflict.cc -o conflict.o
➜ build git:(main) ✗ g++ -shared layer.o conflict.o -o libconflict.so
➜ build git:(main) ✗ g++ -s -L. -o main -lconflict -lmain
ld: warning: option -s is obsolete and being ignored
➜ build git:(main) ✗ ./main
start
work
layer
conflict
finished
```