Den 05/01/2011 kl. 20.36 skrev Jilles Tjoelker: > On Wed, Jan 05, 2011 at 05:55:45PM +0100, Ulrich Spörlein wrote: >> On Wed, 05.01.2011 at 09:34:49 -0500, John Baldwin wrote: >>> These are all marked as __dead2, so the compiler should "know" that these do >>> not return. > >> And clang did the right thing here in the past. Beware that it does no >> inter-procedural analysis yet, so it will usually miss that usage() >> calls exit unconditionally. > >> *But*, it should grok that for err(3) and exit(3). Now there are some >> possible remedies: > >> - get IPA to work with clang, or at least file a bug > >> - mark functions as __dead2 (please don't do that) > > Why not?
Because the analyzer is supposed to find bugs. Only the function that really doesn't return should be marked as such. If we begin spewing __dead2's everywhere, it's bound to silence a valid bug somewhere down the line when e.g. a conditional in a print_help() function is changed subtly so it doesn't always reach exit(). Erik
