dumping C structure sizes from ELF object file

Question

How can you extract the sizes of all C structures from an ELF object file with debugging symbols?

Individual struct sizes can be obtained from GDB using \"print sizeof(s

Answer 1

Install package dwarves, then you have the command "pahole".

Use the "pahole" command against a elf object file, you can get all the structure information, or you can use the "-C" parameter to specific a structure name, for example:

$ pahole vmlinux -C task_struct