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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    1. Luca Sas‏ @SasLuca 28 Mar 2020
      Replying to @Lokathor

      I guess it's my bad for assuming a single translation unit build which compiles instantly :))

      1 reply 0 retweets 0 likes
    2. Lokathor‏ @Lokathor 28 Mar 2020
      Replying to @SasLuca

      Regardless of the rest of the organization of the project, if your lib is 10k lines, and your project is 5k lines, SHL is 15k lines compiled and pre-built is 5k lines compiled. Now, with single-translation-unit it might be too fast to notice either way, but it is a difference.

      2 replies 0 retweets 0 likes
    3. Casey Muratori‏ @cmuratori 28 Mar 2020
      Replying to @Lokathor @SasLuca

      This is an incorrect assumption. The compiler seeing all the at once means that no actual linking table is ever constructed, written, read, and resolved. It may often be _significantly_ faster to recompile an entire library than to link against a prebuilt version.

      2 replies 1 retweet 4 likes
    4. Lokathor‏ @Lokathor 28 Mar 2020
      Replying to @cmuratori @SasLuca

      Ah, so when the final binary is known to be a single translation unit it short circuits the linking process, effectively?

      1 reply 0 retweets 0 likes
    5. Casey Muratori‏ @cmuratori 28 Mar 2020
      Replying to @Lokathor @SasLuca

      So you just put "static" in front of all of your functions, and that prevents them from ever going into the linking table. This causes the compiler to treat them as intra-unit linkage and it doesn't ever have to even do the work of moving to the link phase.

      1 reply 1 retweet 3 likes
    6. Casey Muratori‏ @cmuratori 28 Mar 2020
      Replying to @cmuratori @Lokathor @SasLuca

      So there is a potentially substantial savings (especially when you're in C++ name mangling ridiculousness land!) to be had here that you cannot discount out of hand.

      1 reply 0 retweets 0 likes
    7. Lokathor‏ @Lokathor 28 Mar 2020
      Replying to @cmuratori @SasLuca

      That does sound like a huge savings.

      1 reply 0 retweets 0 likes
    8. Casey Muratori‏ @cmuratori 28 Mar 2020
      Replying to @Lokathor @SasLuca

      And then things get super huge as soon as you start talking about debug info, right - because now the _debug_ info has to be loaded, which is _massive_ (way bigger than the original source), parsed, _and merged_ with the exe if it's statically linked!

      1 reply 0 retweets 3 likes
    9. Casey Muratori‏ @cmuratori 28 Mar 2020
      Replying to @cmuratori @Lokathor @SasLuca

      I think people don't really understand this process and they think they are saving time by precompiling, but you really just lose time if you precompile code that isn't ridiculous TensorFlow nonsense.

      1 reply 0 retweets 1 like
    10. Lokathor‏ @Lokathor 28 Mar 2020
      Replying to @cmuratori @SasLuca

      Well most people that I've seen don't do single-translation-unit projects at all (though I don't follow a lot of C project I guess). Does all this remain true even if you've got a lot of translation units floating around?

      1 reply 0 retweets 0 likes
      Casey Muratori‏ @cmuratori 28 Mar 2020
      Replying to @Lokathor @SasLuca

      Well the tradeoffs don't change. So you could probably construct scenarios, I should think, where even many-translation-unit builds should include the lib as an H everywhere it is used rather than linking, to avoid dumping all those calls into the linker. Again, always test!

      8:20 PM - 28 Mar 2020
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