Just want to put some links here on the standard sources of the C language and Fortran. Sometimes it's reaffirming to read the official documents suggesting how the compilers should interpret the language. In general this page
has most of those references, including info on chips. Although the standards aren't officially released very often, there seems to be constant communication discussing future updates.
The current standard of C is C11, public version:
Links to Fortran standards:
This compact list of gnu packages is great:
search the package, its documentation, and download it into a .txt file (few exceptions). I just use vim to browse them. The g77 docs have some useful notes on interoperability between C and Fortran.