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Unix Co-Creator Brian Kernighan on Rust, Distros and NixOS
(thenewstack.io)
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this post was submitted on 01 Sep 2025
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Programming
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The default for cargo is debug builds why that would surprise anyone as being slower is beyond me, —release isn’t that much extra to type or alias. Do people not learn how their tools work any longer? This isn’t that far off from c/c++ where you set cflags etc to fit the final binaries purpose.
Tbf this mistake comes up so often I do wonder if cargo should have defaulted to release builds. It seems to be what beginners expect.
Gcc, clang, msvc, and all the other compilers also don’t optimize by default. It’s very normal and very expected for the default build to not include optimizations
Sure but you don't normally run GCC or Clang directly; you
make, and that normally does optimise. I think a closer example is CMake which doesn't enable release mode by default.MSVC is usually run from Visual Studio which makes it obvious which mode is being used so the default doesn't matter so much.
As for "all the other compilers", Go optimises by default. It does seem to be the exception though...
Yeah honestly this does smack of PEBKAC/RTFM