For everyone professionally programming and working in a compiled language, how long does your product take to compile for a full clean build? (Full clean means from fresh checkout on a newly set up system to working tests)

@lefticus Depends, does the machine have a souped up Ryzen 9 CPU with 64GiB of RAM? Or is it your college roommate's 2015 MacBook Pro with a barely working screen? :)

@lefticus 3 seconds for multiple 100Ks of LOC

@lefticus would've needed a shorter interval to select 🤷

@lefticus LLVM. Depending on the machine, could be 15 minutes all the way to 1 hour+.

@lefticus I find it mildly worrying that "<10 minutes" was your minimum

@lefticus Why are there no sub-minute options? „<1 second“, „<30 seconds“, „too long“, „way too long“

@lefticus Anything over 1 minute is unacceptable.

@lefticus I do everything in my power to keep our compile time below 10 seconds. Removing templates and other cpp nonsense, unity builds etc. I think it could be done < 2 secs

@lefticus Typically, my projects take less than a minute to compile. This is because I usually use delphi or freepascal whenever I can. Or, unless c or c++ is the only logical choice. Nothing against c languages, I just prefer pascal.

@lefticus 0.6 seconds debug, 10 seconds full release optimizations

@lefticus You’re missing a “Less than 5 seconds” option. It is sad that most people don’t even consider it an option and something achievable. Note that Jonathan Blow targets 1M loc/sec with his Jai programming language.

@lefticus How many cores does the system have? 🙃

@lefticus < 10 minutes seems like a really big interval to me 😬 but I'm not a c/c++ person! Interested in the results.

@lefticus 1.2s, 70k lines of code

@lefticus 2-2.5 sec 100k loc C codebase, debug build 12sec release build

@lefticus This is why modern C++ is hated: that it takes so long to compile that 10 min is the best one can hope for.

@lefticus All of LLVM (clang, lldb, lld, mlir, etc.): * 1 hour 8 minutes on my laptop (16 GB RAM, some i7) * 25 minutes on my first build server (256 GB RAM, 2 Xeon E-somethings) * 4 minutes on my second build server (512 GB RAM, 2 Epycs second from top-of-the-line)

@lefticus Like 20 minutes on M1, but on the horrid windows laptop they gave me like a good 45 mins to an hour

@lefticus 45+ minutes on a stand-alone machine, 15+ with a distributed build system... that's using Unreal Engine on an overclocked 5950X with 64gigs of ram and a fast nvme SSD.

@lefticus How badly the project has to be architectured to take more than 5 mins on normal HW (company issued Lenovo laptop)? I cannot fathom this 😨 so you make some changes that require full rebuild and then go eat lunch? And what about testing the code? insane waste of programmers time

@lefticus When I was working on Minecraft, it was around the 20 minute mark, if I remember correctly. A lot of people used something I thought was a terrible hack that combined all translation units into one. It did speed up builds though, by quite a lot.

@lefticus Rust: 1 minute to download and compile dependencies 5 minutes to compile the service itself (relatively small ~20k LoC, but a lot of monomorphizations for static dispatch by runtime performance reasons) 3 minutes to run unit tests

@lefticus @SheriefFYI < 3 seconds

@lefticus Whatever your answer is, try Clang built with PGO and BOLT to save yourself some build time (double digit percentages if you’re lucky). And lld or mold for linking while you’re at it. And of course ninja.

@lefticus You need <1 minute option and <10s options

@lefticus From the top of my head only the smaller of our C++ based projects takes less than 15min on a 16 thread machine. I recently hit the gnu linker max archive size and had to split stuff into different static libs

@lefticus Apex Legends: ~3 minutes on local 64 core

@lefticus ~30 minutes on distributed build ( w/ incredibuild) ~1 hour local build(high-end machines with 20 threads, parallel build). Both for full release, debug 25% cheaper due to disabled leafs/ build stages. Mostly C++, but also C# and many resource/code generation as build stages.

@lefticus Skill issues galore

@lefticus 2016. 280k loc. 10 sec. Spring4D, one of Delphi's best generics etc libraries. youtube.com/watch?v=kvuxea…

@lefticus It's around a minute for a full clean debug rebuild of a single product + library (build from source) + some pre/post scripts. If for whatever reason it would take dramatically longer I would have restructured my project to use prebuilt static libs or something.

@lefticus Over 30 minutes because of the heavy use of modern C++ features. It's awful.

@lefticus I mean, my engine an and game isn't that big, just about 11kloc atm, but it takes 0.3sec to compile it fully. twitter.com/ZeozenB/status…

@lefticus Huge game engine, 3 minutes on a developer machine. At my previous job, a small game written in modern C++ took 40 minutes. You need to optimize for build times.