Nix Cross Compiling - Public Room Timeline

	Nix Cross Compiling	574 Members
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Sender	Message	Time
7 Dec 2024
Alexandros Liarokapis	(and ideally also set "target-cpu=cortex-m7")	21:04:34
Artturin	There's no support for setting target-cpu globally, if you want it in rust https://github.com/search?q=%2Ftarget-cpu%2F+lang%3Anix+NOT+is%3Afork&type=code	21:08:19
Alexandros Liarokapis	* (and ideally also set `target-cpu=cortex-m7`)	21:08:26
Artturin	Support for setting it would be added in https://github.com/NixOS/nixpkgs/blob/master/pkgs/build-support/cc-wrapper/default.nix	21:09:12
Alexandros Liarokapis	yea I guess that's to be expected, I could probably overlay it to the stdenv, I don't need deep dependency trees anyway but yes adding first-class supported would be very useful.	21:09:34
Alexandros Liarokapis	any idea about the llvm target?	21:09:45
Artturin	just setting `config` should be enough	21:09:55
Alexandros Liarokapis	do you where the config -> llvm mapping occurs ?	21:10:24
Alexandros Liarokapis	* do you know where the config -> llvm mapping occurs ?	21:10:34
Alexandros Liarokapis	I think it was somewhere in the elaboration part, but I don't recall properly.	21:11:15
Artturin	https://github.com/NixOS/nixpkgs/blob/1e56a3b5efd3c4c1451f891863cfb72e471687f7/pkgs/build-support/cc-wrapper/default.nix#L717 https://github.com/NixOS/nixpkgs/blob/master/pkgs/build-support/cc-wrapper/add-clang-cc-cflags-before.sh	21:17:55
Alexandros Liarokapis	thanks a ton!	21:18:16
Artturin	`nix-repl> import ./. { crossSystem = "thumbv7em-none-eabi" ;} error: Unknown CPU type: thumbv7em`	21:20:22
Artturin	You'll have to add the cpu type	21:21:01
Artturin	do `git log -p -M --follow --stat -- lib/systems/parse.nix` for how others have added them	21:21:14
Artturin	example https://github.com/NixOS/nixpkgs/commit/4db467f7e921cfe26c499076ea23044bb8a60ad6#diff-f970a71ad61b6b3ee7cfb369f3de4324885ff93d8d7f6b28253b0a812c166b13R93	21:21:37
9 Dec 2024
	otanaut joined the room.	10:53:55
otanaut	Hey everyone, I am setting up a remote builder VM in my Proxmox environment. The goal is to use this builder to compile x86_64 and aarch64 binaries, as my main system is an Apple Silicon Mac. (Hey, I heard virtualization while you virtualize the virtualizer.) The builder is up and running and doing its job. To compile aarch64 binaries, I configured `boot.binfmt.emulatedSystems = [ "aarch64-linux" ]` on the builder. Is there anything else I should consider or that you would recommend, as I am fairly new to the topic? Thank you!	10:57:39
otanaut	In reply to @otanaut:matrix.org Hey everyone, I am setting up a remote builder VM in my Proxmox environment. The goal is to use this builder to compile x86_64 and aarch64 binaries, as my main system is an Apple Silicon Mac. (Hey, I heard virtualization while you virtualize the virtualizer.) The builder is up and running and doing its job. To compile aarch64 binaries, I configured `boot.binfmt.emulatedSystems = [ "aarch64-linux" ]` on the builder. Is there anything else I should consider or that you would recommend, as I am fairly new to the topic? Thank you! The builder is falling back to TCG to build the aarch64 binaries, not sure if that's "the best i get" or I am missing something.	10:59:10
p14	Artturin: I was hoping I might be able to get a libcxxClang package set by doing `crossSystem = { inherit system; custom = true; }` (custom = true makes buildPlatform != hostPlatform) and then `config.replaceCrossStdenv = { buildPackages, baseStdenv }: buildPackages.libcxxStdenv;`. However this blows up deep in splicing on pkgsTargetTarget. Do you happen to know if there are any threads I can pull on here to make this work?	22:05:41
p14	* Artturin: I was hoping I might be able to get a libcxxClang package set by doing `crossSystem = { inherit system; custom = true; }` (custom = true makes buildPlatform != hostPlatform) and then `config.replaceCrossStdenv = { buildPackages, baseStdenv }: buildPackages.libcxxStdenv;`. However this blows up deep in splicing on pkgsTargetTarget (infinite recursion). Do you happen to know if there are any threads I can pull on here to make this work?	22:06:37
p14	* Artturin: I was hoping I might be able to get a libcxxClang package set by doing `crossSystem = { inherit system; custom = true; }` (custom = true makes buildPlatform != hostPlatform) and then `config.replaceCrossStdenv = { buildPackages, baseStdenv }: buildPackages.llvmPackages.libstdcxxStdenv;` (or similar). However this blows up deep in splicing on pkgsTargetTarget (infinite recursion). Do you happen to know if there are any threads I can pull on here to make this work?	22:13:42
p14	Clearly there is pkgsLLVM, but I'm thinking about pkgsClang (but with libstd++) here.	22:13:50
p14	Ah, apologies for the unnecesssary ping; I think if you make a stdenv with `buildPackages.overrideCC baseStdenv buildPackages.llvmPackages.libstdcxxClang`, it actually works! My error was to try and use `libcxxClang`, this one goes into infinite recursion, but a least that can be fixed by doing `crossSystem = { useLLVM = true; }`.	22:17:53
11 Dec 2024
	marijan changed their profile picture.	14:20:37
	tpool joined the room.	16:37:58
tpool	Would somebody be willing to explain how to use `pkgsLLVM` to me? My goal is to cross compile using clang, and I know that `pkgsLLVM` is key, but can't really see how to use it. Additionally, to select the CPU and FPU, do I pass `config = { mcpu = "<cpu>"; mfpu = "<fpu>"; };` respectively? Sorry if this is a noob question!	16:40:15
tpool	* Would somebody be willing to explain how to use `pkgsLLVM` to me? My goal is to cross compile using clang, and I know that `pkgsLLVM` is key, but can't really see how to use it. Additionally, to select the CPU and FPU, do I pass `config = { mcpu = "<cpu>"; mfpu = "<fpu>"; };` respectively? Sorry if this is a noob question! Moreover, is there a way to set `sysroot` to a different root (i.e. copied off of the target's OS)?	16:42:47
tpool	* Would somebody be willing to explain how to use `pkgsLLVM` to me? My goal is to cross compile using clang, and I know that `pkgsLLVM` is key, but can't really see how to use it. Additionally, to select the CPU and FPU, do I pass `config = { mcpu = "<cpu>"; mfpu = "<fpu>"; };` respectively? Sorry if this is a noob question! Moreover, is there a way to set `sysroot` to a different root (i.e. copied off of the target's filesystem)?	16:43:34
symphorien	about sysroot, I think nixpkgs cross infra will only work with nixpkgs compilers. using stuff compiled outside nix will not fare well.	17:30:08

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