How to tell a library was compiled using C++11

Question

How can I tell if a certain c++ library was linked using c++11 standard?

Answer 1

An elf binary would by default contain the signature of compiler version used.

Now, with regards to compiler flags used, If -frecord-gcc-switches is used at compile time, then, you can find the signature in ELF executable.

 g++ -frecord-gcc-switches -std=c++0x trial.cpp
readelf -p .GCC.command.line a.out

String dump of section '.GCC.command.line':

  [     0]  -imultilib . [     d]  -imultiarch x86_64-linux-gnu   [    2a]  -D_GNU_SOURCE   [ 38]  trial.cpp   [    42]  -mtune=generic   [    51]  -march=x86-64  [    5f]  -std=c++0x   [    6a]  -frecord-gcc-switches   [    80]   
-fstack-protector