Upgrade cmake to v0.1.50

[jfgoog]

This is the latest version. Now that the cc crate has been successfully upgraded, we should upgrade cmake as well, as v0.1.48 is now over 2 years old.

cmake v1.0.49 requires CMAKE_SYSTEM_NAME to be set when cross-compiling, so ensure that we do this for supported Apple OSes.

[rustbot]

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[onur-ozkan]

I hope this will be much easier than cc..

@bors r+ rollup=never

[bors]

📌 Commit c4135b0 has been approved by onur-ozkan

It is now in the queue for this repository.

[bors]

⌛ Testing commit c4135b0 with merge 4d27423...

[bors]

💔 Test failed - checks-actions

[rustbot]

This PR changes how LLVM is built. Consider updating src/bootstrap/download-ci-llvm-stamp.

[jfgoog]

Try CI again?

[onur-ozkan]

Try CI again?

fyi I missed the PR due to "S-waiting-on-author" label.

@bors r+

[bors]

📌 Commit 4742482 has been approved by onur-ozkan

It is now in the queue for this repository.

[bors]

⌛ Testing commit 4742482 with merge 9f330de...

[rust-log-analyzer]

The job dist-apple-various failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

  /usr/local/Cellar/cmake/3.29.2/share/cmake/Modules/CMakeSystemSpecificInitialize.cmake:34 (include)
  CMakeLists.txt:16 (project)


-- Configuring incomplete, errors occurred!
thread 'main' panicked at /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/cmake-0.1.50/src/lib.rs:1098:5:
command did not execute successfully, got: exit status: 1

build script failed, must exit now
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

[bors]

💔 Test failed - checks-actions

[onur-ozkan]

@bors rollup=never

[jfgoog]

• cmake v1.0.49 insists that CMAKE_SYSTEM_NAME be set when cross-compiling, and will set it if not provided by the caller.

• cmake v1.0.50 removes a workaround to for iOS and tvos to prevent an incorrect sysroot from being used from the SDKROOT environment variable (similar to an issue we faced updating the cc crate in Update cc crate for bootstrap to v1.0.97 #122504). The same workaround appears in src/bootstrap/src/core/build_steps/llvm.rs when building LLVM for ios, watchos, tvos, and visionos.

The result of these two changes is that when running cmake, we add "-DCMAKE_SYSTEM_NAME=iOS" and remove "-DCMAKE_OSX_SYSROOT=/" and "-DCMAKE_OSX_DEPLOYMENT_TARGET="

These two seem to interact badly with some built-in cmake logic. On my system, /usr/share/cmake-3.28/Modules/Platform/Darwin-Initialize.cmake has logic based on CMAKE_OSX_SYSROOT:

if(CMAKE_OSX_SYSROOT)
  # Use the existing value without further computation to choose a default.
  set(_CMAKE_OSX_SYSROOT_DEFAULT "${CMAKE_OSX_SYSROOT}")
elseif(NOT "x$ENV{SDKROOT}" STREQUAL "x" AND
        (NOT "x$ENV{SDKROOT}" MATCHES "/" OR IS_DIRECTORY "$ENV{SDKROOT}"))
  # Use the value of SDKROOT from the environment.
  set(_CMAKE_OSX_SYSROOT_DEFAULT "$ENV{SDKROOT}")
elseif(CMAKE_SYSTEM_NAME STREQUAL iOS)
  set(_CMAKE_OSX_SYSROOT_DEFAULT "iphoneos")
elseif(CMAKE_SYSTEM_NAME STREQUAL tvOS)
  set(_CMAKE_OSX_SYSROOT_DEFAULT "appletvos")
# etc.

Then, later on:

# Transform CMAKE_OSX_SYSROOT to absolute path
set(_CMAKE_OSX_SYSROOT_PATH "")
if(CMAKE_OSX_SYSROOT)
  if("x${CMAKE_OSX_SYSROOT}" MATCHES "/")
    # This is a path to the SDK.  Make sure it exists.
    if(NOT IS_DIRECTORY "${CMAKE_OSX_SYSROOT}")
      message(WARNING "Ignoring CMAKE_OSX_SYSROOT value:\n ${CMAKE_OSX_SYSROOT}\n"
        "because the directory does not exist.")
      set(CMAKE_OSX_SYSROOT "")
    endif()
    set(_CMAKE_OSX_SYSROOT_PATH "${CMAKE_OSX_SYSROOT}")
  else()
    _apple_resolve_sdk_path(${CMAKE_OSX_SYSROOT} _sdk_path)
    if(IS_DIRECTORY "${_sdk_path}")
      set(_CMAKE_OSX_SYSROOT_PATH "${_sdk_path}")
      # For non-Xcode generators use the path.
      if(NOT "${CMAKE_GENERATOR}" MATCHES "Xcode")
        set(CMAKE_OSX_SYSROOT "${_CMAKE_OSX_SYSROOT_PATH}")
      endif()
    endif()
  endif()
endif()

This gets triggered from /usr/share/cmake-3.28/Modules/Platform/iOS-Initialize.cmake, which begins:

include(Platform/Darwin-Initialize)

if(NOT _CMAKE_OSX_SYSROOT_PATH MATCHES "/iPhone(OS|Simulator)")
  message(FATAL_ERROR "${CMAKE_OSX_SYSROOT} is not an iOS SDK")
endif()

So what seem to be happening is

• Setting CMAKE_SYSTEM_NAME (which cmake v1.0.49 guarantees is set) triggers the validation logic in iOS-Initialize.cmake.
• Then, Darwin-Initialize.cmake tries to determine the SDK from CMAKE_OSX_SYSROOT, or $ENV{SDKROOT} and transform it into a path, but does so incorrectly, and the validation logic fails.

[jfgoog]

Note to future someone: Cmake caching makes this one hard to debug. You need to blow away build/aarch64-apple-ios/native/sanitizers between builds.