[bug] Since upgrading to Xcode 16.3 all builds using this toolchain fail with `clang: error: version 'arm64' in target triple 'arm64-apple-macosx11.0-arm64' is invalid`

[vallettaventures]

Describe the bug

Since Xcode 16.3 any build using this toolchain file for PLATFORM=MAC_UNIVERSAL fails during configuration with clang: error: version 'arm64' in target triple 'arm64-apple-macosx11.0-arm64' is invalid. Looking through our CI logs, this was not a problem for Xcode 16.2. Cmake version is pinned by Nix so that is not an issue either.

To Reproduce
Steps to reproduce the behavior:

1. Create a minimal c++ hello world example using cmake
2. build with this toolchain file and -DPLATFORM=MAC_UNIVERSAL

Full output is

-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang - broken
CMake Error at /usr/local/share/cmake/Modules/CMakeTestCCompiler.cmake:67 (message):
  The C compiler

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

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: '/Users/vv/Downloads/cmakeg/build/CMakeFiles/CMakeScratch/TryCompile-mNVkdp'
    
    Run Build Command(s): /usr/local/bin/cmake -E env VERBOSE=1 /run/current-system/sw/bin/make -f Makefile cmTC_1eb89/fast
    /run/current-system/sw/bin/make  -f CMakeFiles/cmTC_1eb89.dir/build.make CMakeFiles/cmTC_1eb89.dir/build
    make[1]: Entering directory '/Users/vv/Downloads/cmakeg/build/CMakeFiles/CMakeScratch/TryCompile-mNVkdp'
    Building C object CMakeFiles/cmTC_1eb89.dir/testCCompiler.c.o
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang --target=x86_64-arm64-apple-macosx11.0   -target x86_64-arm64-apple-macosx11.0    -fvisibility=hidden -fvisibility-inlines-hidden  -target x86_64-arm64-apple-macosx11.0    -fvisibility=hidden -fvisibility-inlines-hidden   -arch x86_64 -arch arm64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk -mmacosx-version-min=11.0 -fvisibility=hidden -MD -MT CMakeFiles/cmTC_1eb89.dir/testCCompiler.c.o -MF CMakeFiles/cmTC_1eb89.dir/testCCompiler.c.o.d -o CMakeFiles/cmTC_1eb89.dir/testCCompiler.c.o -c /Users/vv/Downloads/cmakeg/build/CMakeFiles/CMakeScratch/TryCompile-mNVkdp/testCCompiler.c
    clang: error: version 'arm64' in target triple 'arm64-apple-macosx11.0-arm64' is invalid
    make[1]: *** [CMakeFiles/cmTC_1eb89.dir/build.make:82: CMakeFiles/cmTC_1eb89.dir/testCCompiler.c.o] Error 1
    make[1]: Leaving directory '/Users/vv/Downloads/cmakeg/build/CMakeFiles/CMakeScratch/TryCompile-mNVkdp'
    make: *** [Makefile:134: cmTC_1eb89/fast] Error 2
   
  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:2 (project)

Environment

• Cmake versions 3.30.5 and 4.0.0 (identical error)

• Your faulty CMakeLists.txt here:

cmake_minimum_required(VERSION 3.10)
project (example)
add_executable(eg example.cpp)

and c++ file

#include <iostream>

int main() {
    std::cout << "hello" << std::endl;
}

[wcandillon]

I am also experiencing this issue

[kambala-decapitator]

try setting deployment target to 12.0

[leetal]

I'll see when I get some free time. This repo def needs some love since Apple constantly makes undocumented changes that needs addressing. And I've neglected this for far too long 😅

[wcandillon]

@leetal Thanks a lot for the reply :) I found this file to be so useful maybe I will dig into it and try to learn a bit more how this works :)

[kambala-decapitator]

try setting deployment target to 12.0

Try this workaround, pretty sure it'd help: additionally pass -D DEPLOYMENT_TARGET=12.0

[wcandillon]

I tried it as suggested but I got the same error for 12.0 what does this error mean btw?

…

On Fri 18 Apr 2025 at 11:43, Andrey Filipenkov ***@***.***> wrote: try setting deployment target to 12.0 Try this workaround, pretty sure it'd help: additionally pass -D DEPLOYMENT_TARGET=12.0 — Reply to this email directly, view it on GitHub <#219 (comment)> or unsubscribe <https://github.com/notifications/unsubscribe-auth/AACKXVS55MEN72J224SPAF322DCM5BFKMF2HI4TJMJ2XIZLTSSBKK5TBNR2WLJDUOJ2WLJDOMFWWLO3UNBZGKYLEL5YGC4TUNFRWS4DBNZ2F6YLDORUXM2LUPGBKK5TBNR2WLJDUOJ2WLJDOMFWWLLTXMF2GG2C7MFRXI2LWNF2HTAVFOZQWY5LFUVUXG43VMWSG4YLNMWVXI2DSMVQWIX3UPFYGLAVFOZQWY5LFVE2TGMJTGQYDOOBTURXGC3LFVFUGC427NRQWEZLMVRZXKYTKMVRXIX3UPFYGLLCJONZXKZKDN5WW2ZLOOSTHI33QNFRXHE4CUR2HS4DFVJZGK4DPONUXI33SPGSXMYLMOVS2QOBQHAYTIMZWGOBKI5DZOBS2K2LTON2WLJLWMFWHKZNKGI4TMOJWGQ3DAOJXQKSHI6LQMWSWYYLCMVWKK5TBNR2WLKJVGMYTGNBQG44DHJ3UOJUWOZ3FOKTGG4TFMF2GK> . You are receiving this email because you commented on the thread. Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub> .

[kambala-decapitator]

Sorry I'm blind, I thought it's about ios xD As modern xcode no longer supports ios 11.

arm64-apple-macosx11.0-arm64 - the part in monospace (suffix basically) is wrong and should be removed. But I've never used this toolchain for macos builds, so can't help, sorry.

[wcandillon]

Thank you for the insight @kambala-decapitator, I will take a look :)

[oliverepper]

Any updates on this issue?