🚀 go-pugleaf

I thought I'd ask before setting off to reinvent a wheel someone else
already has rolling ...

I need to parse header files to produce information about structures'
elements type, size, and offset.  I want 1) to verify that C structs
being generated for an Intel-based data server have the proper padding &
alignment required by a sparc, and 2) to automatically generate
byte-swapping information needed to use the little-endian Intel data on
a big-endian Sparc or HP.

If anyone has anything like this to share I'd be tickled pink.
Otherwise, I'd be happy with any pointers/code for doing this myself.
Are parts of the Gnu compiler adaptable to purposes such as these?
A yacc-able or bison-able C grammer would be a big start.  Thanx.