How to compile to dynamic library?

[tjliupeng]

How to compile to dynamic library?

[sonullx]

Hi there! Thank you for using our project.

I think I could help with the later question.

This is your command:

g++ -g -std=c++11 -Wall -I./sogou-workflow/include -L./sogou-workflow/lib -l:libworkflow.a src/main.cc -o src/main.o

Here are my two opinions:

• src/main.cc should be put before -l:libworkflow.a. Library order does matter when using g++. See Here for more details.

• -lssl -lcrypto -lpthread is needed following -l:libworkflow.a. Workflow needs OpenSSL and PThreads.

So, I think the right command was:

g++ -g -std=c++11 -Wall src/main.cc -I./sogou-workflow/include/ -L./sogou-workflow/lib -l:libworkflow.a -lssl -lcrypto -lpthread -o src/main.o

In addition, I have two other suggestions:

• g++ outputs an executable file, so main.o might not be a good name. Usually .o file is created by g++ -c.

• It is not necessary to rename _include and _lib dirs under sogou-workflow. But it is all right if you like it, not a problem.

If you got other problems, please don't be hesitate to contact us. Thank you.

[tjliupeng]

My fault.

[tjliupeng]

Thanks @sonullx for quick reply. "main.o" is just for my test code. In formal project, I won't use the name like this.

[tjliupeng]

@sonullx
One more question: why the content of libworkflow.so is text: GROUP ( libworkflow.a AS_NEEDED ( libpthread.so libssl.so libcrypto.so ) ) ? I don't this kind of usage before. Where can I find the reference?

[sonullx]

It is a linker script.

See this.