[llvm-dev] GN build roundtable summary; adding GN build files to the repo (original) (raw)

Zachary Turner via llvm-dev llvm-dev at lists.llvm.org
Wed Oct 31 16:28:26 PDT 2018

That is certainly possible, however if we're going to re-write the entire build system anyway.......

One thing to think about is that generated IDE projects from CMake are less than ideal. In fact I actually made a post about this a few weeks ago. In MSVC I consider them barely usable. I can edit files and get code completion with them, but that's about it. Navigation is painful at best (can take several up to 10 seconds just to open a file), and everything is extremely slow because MSVC is churning away trying to process its build dependency graph. Occasionally things just stop working for 10-20 seconds at a time.

I've heard that Xcode is also barely usable but can't speak for this myself.

Is this any better with gn-generated IDE projects? I actually don't know! Because I've never used them. But it's at least something to think about.

On Wed, Oct 31, 2018 at 4:21 PM Stephen Kelly via llvm-dev < llvm-dev at lists.llvm.org> wrote:

On 31/10/2018 22:44, Dean Michael Berris via llvm-dev wrote: > FWIW, this is consistent with my experience as well. > > I also wrote a presubmit script that I run locally to build/test the cross-product of: > > COMPILER={gcc+gold, clang+lld} > MODE={debug, release-with-assertions} > TARGETS={llvm+clang+lld+compiler-rt, compiler-rt(standalone)} > > While the build/test times are helped by using ninja, the CMake config times are less than optimal.

It is possible that we have features/complexity in our CMakeLists.txt which is not needed. The CMake files are not using modern cmake features. Maybe it's time to change that. It might simplify the buildsystem a bit. Thanks, Stephen.

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