How to add already created .a file while creating .a file

Question

can anyone tell how can I include already existing .a file while creating .a with this?

ar rcs libcrypt.a

I need to add libssl.a and libcrypto.a files together into a libcrypt.a file. Can you help me to solve this?

Answer 1

man ar tells you how to extract all the members from an archive, and it tells you how to insert members into an archive.

So extract all the members from libssl.a and libcrypto.a and insert them all into libcrypt.a, taking care to do the extracting in an empty directory.

$ mkdir scrap
$ cd scrap
$ ar -x ../libssl.a
$ ar -x ../libcrypto.a
$ ar rcs ../libcrypt.a *
$ cd ..
$ rm -r scrap/