Snippets - Revision history

imported>Samueldr: toc

2018-06-07T19:16:46Z

toc

← Older revision		Revision as of 19:16, 7 June 2018
Line 1:		Line 1:
			__TOC__
	This page contains some nix script snippets which might be useful.		This page contains some nix script snippets which might be useful.

imported>Makefu: syntaxHighlight

2018-04-11T19:59:13Z

syntaxHighlight

← Older revision		Revision as of 19:59, 11 April 2018
Line 2:		Line 2:

	== Adding compiler flags to a package ==		== Adding compiler flags to a package ==
			<syntaxHighlight lang=nix>
	optimizeWithFlag = pkg: flag:		optimizeWithFlag = pkg: flag:
	pkg.overrideAttrs (attrs: {		pkg.overrideAttrs (attrs: {
	NIX_CFLAGS_COMPILE = (attrs.NIX_CFLAGS_COMPILE or "") + " ${flag}";		NIX_CFLAGS_COMPILE = (attrs.NIX_CFLAGS_COMPILE or "") + " ${flag}";
	});		});
			</syntaxHighlight>

	This function can further be used to define the following helpers:		This function can further be used to define the following helpers:

	optimizeWithFlags = pkg: flags: pkgs.lib.foldl' (pkg: flag: optimizeWithFlag pkg flag) pkg flags;		<syntaxHighlight lang=nix>
			optimizeWithFlags = pkg: flags: pkgs.lib.foldl' (pkg: flag: optimizeWithFlag pkg flag) pkg flags;
	optimizeForThisHost = pkg: optimizeWithFlags pkg [ "-O3" "-march=native" "-fPIC" ];		optimizeForThisHost = pkg: optimizeWithFlags pkg [ "-O3" "-march=native" "-fPIC" ];
			withDebuggingCompiled = pkg: optimizeWithFlag pkg "-DDEBUG";
	withDebuggingCompiled = pkg: optimizeWithFlag pkg "-DDEBUG";		</syntaxHighlight>

	== Overriding callPackage for finding updated upstream packages in own overrides ==		== Overriding callPackage for finding updated upstream packages in own overrides ==

	With this override for the `callPackage` function, one can automatically detect if the upstream package set has a newer version of an locally overridden package:		With this override for the `callPackage` function, one can automatically detect if the upstream package set has a newer version of an locally overridden package:
			<syntaxHighlight lang=nix>
	callPackage = path: args: let		callPackage = path: args: let
	override = super.callPackage path args;		override = super.callPackage path args;
	upstream = optionalAttrs (override ? "name")		upstream = optionalAttrs (override ? "name")
	(super.${(parseDrvName override.name).name} or {});		(super.${(parseDrvName override.name).name} or {});
	in if upstream ? "name" &&		in if upstream ? "name" &&
	override ? "name" &&		override ? "name" &&
	compareVersions upstream.name override.name != -1		compareVersions upstream.name override.name != -1
	then		then
	trace		trace
	"Upstream `${upstream.name}' gets overridden by `${override.name}'."		"Upstream `${upstream.name}' gets overridden by `${override.name}'."
	override		override
	else override;		else override;
	~~# Credit to makefu~~		</syntaxHighlight>

imported>Matthiasbeyer: Create page

2018-04-11T19:27:23Z

Create page

New page

This page contains some nix script snippets which might be useful.

== Adding compiler flags to a package ==

optimizeWithFlag = pkg: flag:
pkg.overrideAttrs (attrs: {
NIX_CFLAGS_COMPILE = (attrs.NIX_CFLAGS_COMPILE or "") + " ${flag}";
});

This function can further be used to define the following helpers:

optimizeWithFlags = pkg: flags: pkgs.lib.foldl' (pkg: flag: optimizeWithFlag pkg flag) pkg flags;

optimizeForThisHost = pkg: optimizeWithFlags pkg [ "-O3" "-march=native" "-fPIC" ];

withDebuggingCompiled = pkg: optimizeWithFlag pkg "-DDEBUG";

== Overriding callPackage for finding updated upstream packages in own overrides ==

With this override for the `callPackage` function, one can automatically detect if the upstream package set has a newer version of an locally overridden package:

callPackage = path: args: let
override = super.callPackage path args;
upstream = optionalAttrs (override ? "name")
(super.${(parseDrvName override.name).name} or {});
in if upstream ? "name" &&
override ? "name" &&
compareVersions upstream.name override.name != -1
then
trace
"Upstream `${upstream.name}' gets overridden by `${override.name}'."
override
else override;
# Credit to makefu