show library compiler version

wyk@ubuntu:~/code/$ arm-none-linux-gnueabi-objdump -s --section=.comment out/lib/libXxx.so

./out/lib/libXxx.so:     file format elf32-littlearm

Contents of section .comment:
 0000 4743433a 20284c69 6e61726f 20474343  GCC: (Linaro GCC
 0010 20372e32 2d323031 372e3131 2920372e   7.2-2017.11) 7.
 0020 322e3120 32303137 31303131 00        2.1 20171011.  
wyk@ubuntu:~/code/$

show library compiler version