On Wed, 2020-08-26 at 09:37 -0400, Nathan Sidwell wrote: > Hi, > I had a need to add a new type of informative message on the modules > branch, with an option to enable it. The message is not a warning or > an > error, but just 'hey, you asked if X happens. It happens just > here'. > This is emitted as a note. I chose -fnote-$NAME for the option, but > that wasn't a very satisfactory solution. > > I have learnt that clang has -R$NAME options for exactly this kind > of > informative note. Presumably with -Rno-$NAME negation. > > Presumably we could also use this for optimization notes -- 'I failed > to > vectorize this loop because ...' > > thoughts?
I like the idea. FWIW I implemented something like this as part of my revamping of optinfo in gcc 9. I wrote a patch that added "remarks" to the diagnostic framework, which can be seen here: https://gcc.gnu.org/legacy-ml/gcc-patches/2018-07/msg00067.html though that patch is somewhat coupled to the optinfo stuff. IIRC it was somehow eventually dropped; I think I ended up just extending/updating the -fopt-info output, and the "remarks" infrastructure never made it into trunk (possibly due to a desire to avoid duplication; I can't quite remember the details). Dave
