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doc(README): document requirements for cross-compiling with OpenSSL support #6738

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doc(README): document requirements for cross-compiling with OpenSSL support #6738

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Expand Up @@ -183,6 +183,23 @@ Alternatively, you can run `make build` to build the go-ipfs binary (storing it

**NOTE:** If you get an error along the lines of "fatal error: stdlib.h: No such file or directory", you're missing a C compiler. Either re-run `make` with `CGO_ENABLED=0` or install GCC.

##### Cross Compiling

Compiling for a different platform is as simple as running:

```
make build GOOS=myTargetOS GOARCH=myTargetArchitecture
```

##### OpenSSL

To build go-ipfs with OpenSSL support, append `GOFLAGS=-tags=openssl` to your `make` invocation. Building with OpenSSL should significantly reduce the background CPU usage on nodes that frequently make or receive new connections.

Note: OpenSSL requires CGO support and, by default, CGO is disabled when cross compiling. To cross compile with OpenSSL support, you must:

1. Install a compiler toolchain for the target platform.
2. Set the `CGO_ENABLED=1` environment variable.

#### Troubleshooting

- Separate [instructions are available for building on Windows](docs/windows.md).
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