alt Hacker NewsAside, I'm somewhat surprised that MISRA (as of 2012 at least) doesn't have a directive related to definedness vs value errors.
Aside, I'm somewhat surprised that MISRA (as of 2012 at least) doesn't have a directive related to definedness vs value errors.
Always use -Wundef. For CCAN all config vars use #if and we lint for ifdefs of them, because you have to pick a side here, and sometimes using HAVE_X in C code is useful, so I prefer always-defined.