Using Clang instead of GCC: Difference between revisions
imported>Mickours Adding more details + different scenario |
imported>Artturin Undoing a edit because it's not exactly true and is because of a bug, linked the issue |
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<syntaxhighlight lang="nix"> | <syntaxhighlight lang="nix"> | ||
stdenv = pkgs.clangStdenv; | stdenv = pkgs.clangStdenv; | ||
</syntaxhighlight> | |||
or to get a specific version of clang: | |||
<syntaxhighlight lang="nix"> | |||
stdenv = pkgs.llvmPackages_9.stdenv; | |||
</syntaxhighlight> | </syntaxhighlight> | ||
Depending on the case you may want to set this value in different location, and using different mechanism. | Depending on the case you may want to set this value in different location, and using different mechanism. | ||
Note you may get errors like <code>fatal error: ... file not found</code> on standard library <code>#include</code> directives, because of this bug https://github.com/NixOS/nixpkgs/issues/150655 | |||
== Globally, in a package repository tree == | == Globally, in a package repository tree == | ||
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If you have a set of packages in a repository tree, you can set the | If you have a set of packages in a repository tree, you can set the | ||
<code>stdenv</code> value in the scope where the <code>callPackage</code> are | <code>stdenv</code> value in the scope where the <code>callPackage</code> are | ||
called. Be carefull '''all the packages present in the scope will be built with Clang''' | called. Be carefull '''all the packages present in the scope will be built with Clang''' | ||
because the <code>callPackage</code> that resolves the package function | because the <code>callPackage</code> that resolves the package function | ||
inputs will use the <code>pkgs.clangStdenv</code> for all packages. | inputs will use the <code>pkgs.clangStdenv</code> for all packages. | ||
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} | } | ||
</syntaxhighlight> | </syntaxhighlight> | ||
or import nixpkgs with replaceStdenv. | |||
<syntaxhighlight lang="nix"> | |||
import <nixpkgs> { config = { replaceStdenv = ({ pkgs }: pkgs.clangStdenv); }; } | |||
</syntaxhighlight> | |||
== For a specific package in a repository tree == | == For a specific package in a repository tree == | ||
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nix-build ./hello_with_clan.nix | nix-build ./hello_with_clan.nix | ||
</syntaxhighlight> | </syntaxhighlight> | ||
== With nix-shell == | |||
To use clang in nix-shell instead of gcc: | |||
<syntaxhighlight lang="nix"> | |||
# in file ./shell.nix | |||
with import <nixpkgs> {}; | |||
clangStdenv.mkDerivation { | |||
name = "clang-nix-shell"; | |||
buildInputs = [ /* add libraries here */ ]; | |||
} | |||
</syntaxhighlight> | |||
== See also == | |||
* [[C#Use_a_different_compiler_version|C # Use a different compiler version]] | |||
[[Category:Nixpkgs]] | [[Category:Nixpkgs]] | ||