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Add documentation on how to enable compilation of binary dependencies. #1625

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Add documentation on how to enable compilation of binary dependencies. #1625

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33 changes: 33 additions & 0 deletions docs/common-patterns.md
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Expand Up @@ -141,3 +141,36 @@ in {
];
}
```

### Compile x86 dependencies on ARM Macs via Rosetta

If you want to also compile dependencies for x86, you can add dependencies to `packages`:

```nix
packages = with rosettaPkgs; [
# these are the packages required for pymssql
freetds
krb5
openssl
];
```

And switch the compiler to x86:

```nix
stdenv = rosettaPkgs.stdenv;
```

Then, in the generated shell, you can compile software for x86, like `pymssql` or `ibm_db`. However some creative DYLD_FALLBACK_LIBRARY_PATH may be required to make some dependency libraries available to the x86 binaries:

```sh
export DYLD_FALLBACK_LIBRARY_PATH="${rosettaPkgs.lib.makeLibraryPath [ rosettaPkgs.gcc14.cc] }:$DYLD_FALLBACK_LIBRARY_PATH"
git clone [email protected]:pymssql/pymssql.git
${rosettaPkgs.python312Full}/bin/python3 -m venv venv
source venv/bin/activate
(
cd pymssql
pip install -e .
)
pip install ibm_db
```