From the peanut gallery: Perhaps something like --cuda_arch=min_supported would solve your problem while still meeting tra's request not to change behavior of the compiler based on something external.
On Mon, Mar 9, 2020 at 12:58 PM Raul Tambre via Phabricator <revi...@reviews.llvm.org> wrote: > > tambre added a comment. > > > Magically changing compiler target based on something external to compiler > > is a bad idea IMO. I would expect a compilation with exactly the same > > compiler options to do exactly the same thing. If we magically change > > default target, that will not be the case. > > It'd be the same behaviour as NVCC, which compiles for the lowest > architecture it supports. > > I'm currently implementing Clang CUDA support for CMake and lack of this > behaviour compared to other languages and compilers complicates matters. > During compiler detection CMake compiles a simple program, which includes > preprocessor stuff for embedding compiler info in the output. Then it parses > that and determines the compiler vendor, version, etc. > > The general assumption is that a compiler can compile a simple program for > its language without us having to do compiler-specific options, flags, etc. > If the compiler fails on this simple program, it's considered broken. > A limited list of flags is usually cycled through to support exotic compilers > and I could do the same here, but it'd require us invoking the compiler > multiple times and increasingly more as old architectures are deprecated. > We could detect the CUDA installation ourselves and specify a list of arches > for each. This seems quite unnecessary when Clang already knows the version > and could select a default that at least compiles. > Note that this detection happens before any user CMake files are ran, so we > can't pass the user's preferred arch (which could also differ per file). > > > Repository: > rG LLVM Github Monorepo > > CHANGES SINCE LAST ACTION > https://reviews.llvm.org/D75811/new/ > > https://reviews.llvm.org/D75811 > > > _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
