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stdenv/cross-compilation: add section on avoiding cross-compiling GCC

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Ben Siraphob 2021-02-21 22:10:42 +07:00
parent 4550d6596b
commit 251897b40d
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doc/stdenv/cross-compilation.chapter.md
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@ -106,6 +106,13 @@ Many packages assume that an unprefixed binutils (`cc`/`ar`/`ld` etc.) is availa
makeFlags = [ "CC=${stdenv.cc.targetPrefix}cc" ];
```
#### How do I avoid compiling a GCC cross-compiler from source? {#cross-qa-avoid-compiling-gcc-cross-compiler}
On less powerful machines, it can be inconvenient to cross-compile a package only to find out that GCC has to be compiled from source, which could take up to several hours. Nixpkgs maintains a limited [cross-related jobset on Hydra](https://hydra.nixos.org/jobset/nixpkgs/cross-trunk), which tests cross-compilation to various platforms from build platforms "x86\_64-darwin", "x86\_64-linux", and "aarch64-linux". See `pkgs/top-level/release-cross.nix` for the full list of target platforms and packages. For instance, the following invocation fetches the pre-built cross-compiled GCC for `armv6l-unknown-linux-gnueabihf` and builds GNU Hello from source.
```ShellSession
$ nix-build '<nixpkgs>' -A pkgsCross.raspberryPi.hello
```
#### What if my package's build system needs to build a C program to be run under the build environment? {#cross-qa-build-c-program-in-build-environment}
Add the following to your `mkDerivation` invocation.
```nix