[SR-14904] iOS Build Instructions do not work

[swift-ci]

Previous ID	SR-14904
Radar	rdar://problem/80383591
Original Reporter	helge (JIRA User)
Type	Bug
Status	Resolved
Resolution	Done

Environment

BS 11.4 M1 Mac Mini

Additional Detail from JIRA

Votes	0
Component/s	SwiftSyntax
Labels	Bug
Assignee	@CodaFi
Priority	Medium

md5: 26a25700ee470efd7e3fe2ce646b30e5

Issue Description:

I'm trying to build SwiftSyntax for iOS using the simple steps described in the README: https://github.com/apple/swift-syntax/blob/main/README.md

git clone https://github.com/apple/swift.git
./swift/utils/update-checkout --clone
./swift/utils/build-parser-lib --release --no-assertions --build-dir /tmp/parser-lib-build-ios --host iphoneos --architectures arm64

Unfortunately that fails pretty quickly in the CC detection:

-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc - broken
CMake Error at /usr/local/Cellar/cmake/3.20.3/share/cmake/Modules/CMakeTestCCompiler.cmake:66 (message):
  The C compiler

    "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: /tmp/parser-lib-build-ios/arm64/obj/CMakeFiles/CMakeTmp
    
    Run Build Command(s):/usr/local/bin/ninja cmTC_3a1e2 && [1/2] Building C object CMakeFiles/cmTC_3a1e2.dir/testCCompiler.c.o
    [2/2] Linking C executable cmTC_3a1e2
    FAILED: cmTC_3a1e2 
    : && /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc -arch arm64 -target arm64-apple-ios10.0  -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.5.sdk -miphoneos-version-min=10.0 -Wl,-search_paths_first -Wl,-headerpad_max_install_names  CMakeFiles/cmTC_3a1e2.dir/testCCompiler.c.o -o cmTC_3a1e2   && :
    ld: warning: ignoring file /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.5.sdk/usr/lib/libSystem.tbd, missing required architecture x86_64 in file /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.5.sdk/usr/lib/libSystem.tbd (4 slices)
    ld: dynamic main executables must link with libSystem.dylib for architecture x86_64
    clang: error: linker command failed with exit code 1 (use -v to see invocation)
    ninja: build stopped: subcommand failed.

[typesanitizer]

@swift-ci create

[CodaFi]

Tried the cross build for myself on an x86_64 host with Xcode 13 and ran into what I believe is a related issue.

apple/swift#38352

Could you give this fix a shot locally with Xcode 13 and see if that changes anything here? I suspect there may be a deeper issue with the M1-hosted cross build considering the -arch here is completely bogus.