Can I determine which compiler/linker flags where used to create a binary-only shared library?

Question

I am wondering if there is a way to find out which g++ compiler/linker flags where used in creating a binary-only library.

For example there might be a 3rd

Answer 1

There is no systematic way of doing this. You can look if the library is linked to libpthread as an indication of whether -pthreads was used. For PIC/non-PIC code, you may want to try this. Optimization level, tuning and others will be much harder to determine.