Question

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How to pack multiple library archives (.a) into one archive file?

I have a situation where I must provide only a single static library (.a file) to an executable file to build it.

However, I split this lib in 2 parts because one part is common to other executable files and the other is needed only by one.

So now I have lib1 (for exe1) and lib2 (for all exes)

The problem is that I can’t provide two libs, so I must merge for exe1, lib2 into lib1

I tried my compiling the lib1.o with -llib2 but even if it works, it looks like if nothing happened

Are there any other way? I’m can only think about using raw object files but I don’t like this idea

Answer 1

There’s no need for two static libraries; when a static library is used, only the functions (or variables) that are needed are copied to the executable – unlike a shared library where everything in the library is accessible to the executable.

Mechanically, the other question referenced describes what you need to do:

• Extract all the object files from one library
• Add them to the other library

Or:

files=$(ar t lib1.a)
ar x lib1.a
ar r lib2.a $files
rm -f $files lib1.a