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Nix Hackers

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For people hacking on the Nix package manager itself187 Servers

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15 Oct 2025
@xokdvium:matrix.orgSergei Zimmerman (xokdvium)
In reply to @xokdvium:matrix.org
Also the linker
You should disable b_lto
17:53:23
@philiptaron:matrix.orgPhilip Taron (UTC-8)At $WORK we use clang modules to escape the PCH trap17:53:25
@xokdvium:matrix.orgSergei Zimmerman (xokdvium)Honestly PCH is pretty good for us. LTO on the other hand is very slow17:54:04
@fzakaria:one.ems.hostfzakariaI think it's cause NIX_CFLAGS is implicit outside meson?17:54:06
@xokdvium:matrix.orgSergei Zimmerman (xokdvium)
In reply to @philiptaron:matrix.org
At $WORK we use clang modules to escape the PCH trap
Let’s just wait until 2036 for modules to get supported on all platforms and in meson
17:55:41
@philiptaron:matrix.orgPhilip Taron (UTC-8) Our impl doesn't give two hoots about gcc -- it's clang + C23 all the way ;-) 17:56:20
@philiptaron:matrix.orgPhilip Taron (UTC-8) Modules (the clang impl) works great with C. 17:56:39
@philiptaron:matrix.orgPhilip Taron (UTC-8)Maybe even better than with C++.17:56:50
@philiptaron:matrix.orgPhilip Taron (UTC-8) Actually, definitely better than with C++. 17:57:00
@fzakaria:one.ems.hostfzakaria how do I go from Store to BinaryCacheStore21:55:59
@fzakaria:one.ems.hostfzakariathe config only return ref<Store>21:56:04
@fzakaria:one.ems.hostfzakariadynamic_pointer_cast?21:57:08
@fzakaria:one.ems.hostfzakaria

Sergei Zimmerman (xokdvium): writing a unit test for that issue you sent me is a bit harder because I think it's S3 specific (needs a store that uses query params)

For now I have https://github.com/NixOS/nix/pull/14266

One option: write a store just for tests that is simiilar to HttpBinaryCacheStore but sends the derivation path as a query parameter to test the encoding?

23:37:42
@xokdvium:matrix.orgSergei Zimmerman (xokdvium)
In reply to @fzakaria:one.ems.host

Sergei Zimmerman (xokdvium): writing a unit test for that issue you sent me is a bit harder because I think it's S3 specific (needs a store that uses query params)

For now I have https://github.com/NixOS/nix/pull/14266

One option: write a store just for tests that is simiilar to HttpBinaryCacheStore but sends the derivation path as a query parameter to test the encoding?

The S3 stuff is no longer relying on custom logic (since a couple hours ago) tho
23:38:32

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