android-native-tools

Compress Windows LLVM binaries with UPX in order to decrease our distribution package size.

The recent bump to LLVM 14 is causing problems with the Mono AOT compiler, so for the time being we're going back to 13.0.1.
The only difference between this release and L_13.0.1-4.0.1 is that we now include Windows PDB files in the archive.

Upgrades the LLVM version to the just-released 14.0.1 version (changes) and enables creating Windows PDB files for all the binaries.

The toolchain now includes llc (the LLVM IR to object file/assembler compiler) which will eventually be used by Xamarin.Android.

This release is created from the llvm-mingw branch (PR) which at some point will be merged into main but for now it remains in a separate branch. This release is purely for Xamarin.Android test purposes, it should not be used for anything else at this point.

We've decided to use only LLVM for all the tools, thus replacing the gold linker from GNU Binutils with lld from LLVM.

The toolchain uses llvm-mc, llvm-strip/objdump from LLVM and the gold linker from Binutils. It also contains a gas wrapper around llvm-mc so that Mono/dotnet AOT can work without any changes.

ARM32 builds need to target ARMv7-a

• ARM32 should accept Thumb instructions now
• Windows wrapper scripts (.cmd) quote their paths

Fix process creation on Windows

Use Binutils 2.38 and fix a handful of issues with the GAS wrapper:

• Use correct triple for x86_64
• Correctly map -mfpu=vfp3 for ARM

Add a missing variable to the llvm-strip wrapper script

* Don't use symlinks on Unix, use wrapper scripts instead
* Don't determine target architecture of the `as` wrapper by looking
  at the process name.  Instead, pass `@gas-arch=` as the very first
  parameter to the wrapper, on all platforms.

Add undocumented GAS option

• -mfpu=vfp3 is an undocumented alias for -mfpu=vfpv3, but since it's used by Mono/dotnet AOT, we need to support it.

Code cleanup

• Improve build scripts so that they work even if not invoked from their own directory
• Remove some debug info
• Do not change directory to the one where assembler code resides when invoking llvm-mc, this breaks Mono/dotnet AOT
• Make a copy of executable path string passed in argv[0] to llvm-mc as it is freed by std::string when it goes out of scope and we get garbage passed to llvm-mc

Partially replace GNU Binutils with LLVM tools (assembler and strip) while keeping the GNU linker (gold) for now.

Binutils 2.36 introduced code that breaks as (and possibly others) when the path with the source files contains special characters (e.g. テスト). Downgrade to one version before that in order to avoid breakage for Xamarin.Android users.

Bump to Binutils 2.37

Supports building fat binaries for Linux (x86_64), macOS (x86_64 and arm64) and Windows (x86_64)