使用-ffunction sections标志编译的不同静态库

简单来说:

# Collect function sections
$ readelf -S tmp.o | sed -ne 's/.*\] \.text.\([a-zA-Z0-9_]\+\) .*/\1/p' | sort -u > fun_sec.lst

# Collect function symbols
$ nm tmp.o | grep ' T ' | awk '{print $3}' | sort -u > fun_sym.lst

# Compare
$ COMM=$(comm -12 fun_sym.lst fun_sec.lst | wc -l)
$ UNIQ=$(comm -3 fun_sym.lst fun_sec.lst | wc -l)
$ if test $COMM -gt $UNIQ; then echo "tmp.o was likely compiled with -ffunction-sections"; fi