C: Difference between revisions
imported>Mic92 language server.. |
imported>Mic92 document overrideCC and wrapCCWith |
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Tooling that provides autocompletion or refactoring support also needs to be aware of the environments variables | Tooling that provides autocompletion or refactoring support also needs to be aware of the environments variables | ||
to find C/C++ header files. Nixpkgs adds wrapper to both language server [ccls](https://github.com/MaskRay/ccls) and [cquery](https://github.com/cquery-project/cquery) to extend the include path of these tools. [CCLS](https://github.com/MaskRay/ccls/wiki) also provides extensive documentation on how to setup a project/editors to make use of it. | to find C/C++ header files. Nixpkgs adds wrapper to both language server [ccls](https://github.com/MaskRay/ccls) and [cquery](https://github.com/cquery-project/cquery) to extend the include path of these tools. [CCLS](https://github.com/MaskRay/ccls/wiki) also provides extensive documentation on how to setup a project/editors to make use of it. | ||
== Use a different compiler version == | |||
Adding a different c compiler to `buildInputs` in a nix expression will not change the default compiler | |||
available in `$PATH`. Instead nixpkgs provides a `overrideCC` function: | |||
<syntaxHighlight lang=nix> | |||
(overrideCC stdenv gcc8).mkDerivation { | |||
name = "env"; | |||
} | |||
</syntaxHighlight> | |||
<syntaxHighlight lang=console> | |||
$ nix-shell --command 'gcc --version' | |||
gcc (GCC) 8.3.0 | |||
</syntaxHighlight> | |||
== Get a compiler without default libc == | |||
By default cc wrapper will include the libc headers (i.e. glibc). This can break for example projects that would bring their own libc (i.e. musl). However it is possible to get a cc wrapper that would include all build inputs without adding glibc: | |||
<syntaxHighlight lang=nix> | |||
let | |||
gcc_nolibc = wrapCCWith { | |||
cc = gcc.cc; | |||
bintools = wrapBintoolsWith { | |||
bintools = binutils-unwrapped; | |||
libc = null; | |||
}; | |||
}; | |||
in (overrideCC stdenv gcc_nolibc).mkDerivation { | |||
name = "env"; | |||
} | |||
</syntaxHighlight> | |||