Commits on Aug 16, 2021

1. Allow the iOS toolchain to be built on Linux …

   The iOS toolchain can be built on Linux with minor changes. The
   compilation will invoke `xcrun` to find the path to the iPhone SDK but
   a fake `xcrun` executable can be used.
   
   ```
   #!/bin/sh
   echo "/path/to/sdk"
   ```
   
   The iOS toolchain can then be built and linked with rustup.
   
   ```
   $ ./x.py build --stage 2 --host x86_64-unknown-linux-gnu \
     	 --target aarch64-apple-ios
   $ rustup toolchain link stage1 build/x86_64-unknown-linux-gnu/stage1
   ```
   
   It's possible to take this toolchain and compile an iOS executable
   with it. This requires the ld64 linker and an iOS SDK. The ld64 linker
   can be taken from
   [cctools](https://github.com/tpoechtrager/cctools-port). A project's
   .cargo/config can then be edited to use the linker for this target.
   
   ```
   [target.aarch64-apple-ios]
   linker = "/path/to/cctools/bin/arm-apple-darwin-ld"
   rustflags = [
       "-C",
       """
   link-args=
       -F/path/to/sdk/System/Library/Frameworks
       -L/path/to/sdk/usr/lib
       -L/path/to/sdk/usr/lib/system/
       -adhoc_codesign
       """,
   ]
   ```

   

   kit-981 committed Aug 16, 2021
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