Determine target ISA extensions of binary file in Linux (library or executable)

Question

We have an issue related to a Java application running under a (rather old) FC3 on an Advantech POS board with a Via C3 processor. The java application has several compiled

Answer 1

Expanding upon @Hi-Angel's answer I found an easy way to check the bit width of a static library:

readelf -a -W libsomefile.a | grep Class: | sort | uniq

Where libsomefile.a is my static library. Should work for other ELF files as well.