lix-project/lix
20
57
Fork 31
Code Issues 349 Code Review (Gerrit) Projects 3 Releases Wiki Activity

expand on the extra-platforms option

Browse source
This commit is contained in:
Valentin Gagarin 2023-07-19 10:57:37 +02:00
parent fcadac0a02
commit 0779005f49
1 changed files with 15 additions and 13 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

28
src/libstore/globals.hh
View file

@ -194,7 +194,7 @@ public:
this, SYSTEM, "system",
R"(
The system type of the current Nix installation.
Nix will only build a given [derivation](@docroot@/language/derivations.md) locally when its `system` attribute equals the value specified here or in [`extra-platforms`](@docroot@/command-ref/conf-file.html#conf-extra-platforms).
Nix will only build a given [derivation](@docroot@/language/derivations.md) locally when its `system` attribute equals any of the values specified here or in [`extra-platforms`](#conf-extra-platforms).
The default value is set when Nix itself is compiled for the system it will run on.
The following system types are widely used, as [Nix is actively supported on these platforms](@docroot@/contributing/hacking.md#platforms):
@ -676,18 +676,20 @@ public:
getDefaultExtraPlatforms(),
"extra-platforms",
R"(
Platforms other than the native one which this machine is capable of
building for. This can be useful for supporting additional
architectures on compatible machines: i686-linux can be built on
x86\_64-linux machines (and the default for this setting reflects
this); armv7 is backwards-compatible with armv6 and armv5tel; some
aarch64 machines can also natively run 32-bit ARM code; and
qemu-user may be used to support non-native platforms (though this
may be slow and buggy). Most values for this are not enabled by
default because build systems will often misdetect the target
platform and generate incompatible code, so you may wish to
cross-check the results of using this option against proper
natively-built versions of your derivations.
System types of executables that can be run on this machine.
Nix will only build a given [derivation](@docroot@/language/derivations.md) locally when its `system` attribute equals any of the values specified here or in the [`system` option](#conf-system).
Setting this can be useful to build derivations locally on compatible machines:
- `i686-linux` executables can be run on `x86_64-linux` machines (set by default)
- `x86_64-darwin` executables can be run on macOS `aarch64-darwin` with Rosetta 2 (set by default where applicable)
- `armv6` and `armv5tel` executables can be run on `armv7`
- some `aarch64` machines can also natively run 32-bit ARM code
- `qemu-user` may be used to support non-native platforms (though this
may be slow and buggy)
Build systems will usually detect the target platform to be the current physical system and therefore produce machine code incompatible with what may be intended in the derivation.
You should design your derivation's `builder` accordingly and cross-check the results when using this option against natively-built versions of your derivation.
)", {}, false};
Setting<StringSet> systemFeatures{