On Nov 27, 2012, at 8:00 AM, Diego Novillo <dnovi...@google.com> wrote: > I admit that I'm partly fishing here, but my proposal is based on the > following: > > * The implementation of PCH in GCC is atrocious and hard to maintain. > * The next C++ standard is likely to define modules > (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3347.pdf) > * The user-base for PCH is negligibly small (here's where I'm mostly > guessing). > * PCH is absolutely useless for C.
PCH is used extensively in Objective-C code and many C++ applications that also build for windows. I'm not sure how important these communities are though... -Chris > > Removing PCH will give us more implementation freedom for the memory > management project > (http://gcc.gnu.org/wiki/cxx-conversion/gc-alternatives). > > With some effort, we could revive the streaming work done in the PPH > branch and re-implement PCH with it (when we abandoned the branch, we > were probably 80% complete as a PCH replacement). If we could at least > remove support for C, then I can see a streaming-based PCH for the 4.9 > release. > > Thoughts? > > Are there any big PCH users out there? > > > Thanks. Diego.
