Fix script, add Swift v5 support*, and add workflow

[L1ghtmann]

*This will build successfully, and the resulting toolchain does appear to mostly work on-device, but there are a couple of issues that prevent said toolchain from being ready for release as-is:

1. Executing swift/swift-frontend results in a crash:

<unknown>:0: error: fatal error encountered during compilation; please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the project
<unknown>:0: note: Compiler-internal integrated REPL has been removed; use the LLDB-enhanced REPL instead.
Please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the project and the crash backtrace.
Stack dump:
0.      Program arguments: /usr/share/swift_stash/bin/swift-frontend -frontend -repl -Xllvm -aarch64-use-tbi -enable-objc-interop -color-diagnostics -module-name REPL
1.      Apple Swift version 5.5.1 (swift-5.5.1-RELEASE)
2.
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  swift-frontend           0x0000000103f70520 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56
1  swift-frontend           0x0000000103f6f3d8 llvm::sys::RunSignalHandlers() + 128
2  swift-frontend           0x0000000103f70c04 SignalHandler(int) + 360
3  libsystem_platform.dylib 0x00000001dac2ad90 <redacted> + 52
4  libsystem_pthread.dylib  0x00000001dac3a9e8 pthread_kill + 212
5  libsystem_c.dylib        0x000000019b1f38f4 abort + 100
6  swift-frontend           0x00000001000b9364 PrettyStackTraceFrontend::~PrettyStackTraceFrontend() + 0
7  swift-frontend           0x0000000103ee2258 llvm::report_fatal_error(llvm::Twine const&, bool) + 244
8  swift-frontend           0x0000000103ee2164 llvm::report_fatal_error(llvm::Twine const&, bool) + 0
9  swift-frontend           0x00000001000b91b8 PrettyStackTraceFrontend::~PrettyStackTraceFrontend() + 0
10 swift-frontend           0x0000000100025ac0 main + 468
11 libdyld.dylib            0x000000019215d568 <redacted> + 4
Abort trap: 6

• This appears to be a known issue (?) [see here]
  • And, yes, llvm-symbolizer is in the PATH

2. There seems to be an issue with the queried include path(s), as trying to compile a regular swift project with the latest master branch theos results in:

/var/mobile/theos/sdks/iPhoneOS14.5.sdk/usr/include/module.modulemap:118:11: error: header 'stdarg.h' not found
   header "stdarg.h" // note: supplied by the compiler
          ^
<unknown>:0: error: could not build Objective-C module 'Darwin'
/var/mobile/theos/sdks/iPhoneOS14.5.sdk/usr/lib/swift/Foundation.swiftmodule/arm64-apple-ios.swiftinterface:4:8: error: failed to build module 'Combine'; this SDK is not supported by the compiler (the SDK is built with 'Apple Swift version 5.4 (swiftlang-1205.0.24.14 clang-1205.0.19.54)', while this compiler is 'Apple Swift version 5.5.1 (swift-5.5.1-RELEASE)'). Please select a toolchain which matches the SDK.

despite the header in question existing in two places: /usr/lib/llvm-10/lib/clang/10.0.0/include/stdarg.h /usr/share/swift_stash/lib/clang/10.0.0/include/stdarg.h and swiftc checking the correct paths:

$ swiftc -print-target-info
{
  "compilerVersion": "Apple Swift version 5.5.1 (swift-5.5.1-RELEASE)",
  "target": {
    "triple": "arm64-apple-ios10.0",
    "unversionedTriple": "arm64-apple-ios",
    "moduleTriple": "arm64-apple-ios",
    "swiftRuntimeCompatibilityVersion": "5.0",
    "compatibilityLibraries": [
      {
        "libraryName": "swiftCompatibility50",
        "filter": "all"
      },
      {
        "libraryName": "swiftCompatibility51",
        "filter": "all"
      },
      {
        "libraryName": "swiftCompatibilityDynamicReplacements",
        "filter": "executable"
      }
    ],
    "librariesRequireRPath": true
  },
  "paths": {
    "runtimeLibraryPaths": [
      "/usr/share/swift_stash/lib/swift/iphoneos",
      "/usr/lib/swift"
    ],
    "runtimeLibraryImportPaths": [
      "/usr/share/swift_stash/lib/swift/iphoneos"
    ],
    "runtimeResourcePath": "/usr/share/swift_stash/lib/swift"
  }
}

I don't see why the compiler wouldn't support older sdks, so I am assuming it's somehow related to 1 or the include path situation...?

I've confirmed the symlinks at said paths are valid but am at a loss with how to proceed. Feel free to take it from here, advise if you'd like me to take a look again, or ignore this for the time being.

Tested on iP7 -- iOS 14.3 -- Unc0ver

Supersedes #3 and "resolves" #2.

[L1ghtmann]

Test v5+ libswift: https://github.com/L1ghtmann/libswift/releases/latest/ Test v5+ toolchain: https://github.com/L1ghtmann/swift-toolchain-ios/releases/latest/

Edit: toolchain size drops to ~200 MBs when FINALPACKAGE is passed (which it was not in the release linked above)

[zx500xl]

Test v5+ libswift: https://github.com/L1ghtmann/libswift/releases/latest/ Test v5+ toolchain: https://github.com/L1ghtmann/swift-toolchain-ios/releases/latest/

Edit: toolchain size drops to ~200 MBs when FINALPACKAGE is passed (which it was not in the release linked above)

Did it work for you and what device and iOS version did you test on?

[L1ghtmann]

No, it still has the issues mentioned above.

Tested on iPhone 7 14.3.