Compile fails with LLVM_ENABLE_RUNTIMES="libcxx;libcxxabi;libc;libunwind" on Mac M1

[billhoffman]

c++ -v
Apple clang version 16.0.0 (clang-1600.0.26.3)
Target: arm64-apple-darwin23.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

In file included from /Users/hoffman/Work/llvm/llvm-project/libunwind/src/AddressSpace.hpp:35:
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.0.sdk/usr/include/dlfcn.h:36:10: fatal error: 'stdbool.h' file not found

cmake -DLLVM_ENABLE_PROJECTS=clang -DCMAKE_INSTALL_PREFIX=/Users/hoffman/Work/llvm-main-inst-mine -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi;libc;libunwind" -G Ninja ../llvm

[asl]

Looks like the issue with Apple-installed SDKs as the error is:

/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.0.sdk/usr/include/dlfcn.h:36:10: fatal error: 'stdbool.h' file not found

Would be better to report to Apple

[billhoffman]

Bad example... :)

/Users/hoffman/Work/llvm/llvm-project/libunwind/src/Unwind-sjlj.c:16:10: fatal error: 'stdbool.h' file not found

Also, the apple sdk compiler can find stdbool.h. However, the bootstrapped clang is causing the trouble: 'llvm-project/build2/bin/clang'

It is some interaction with the system and the bootstrapped compiler. Because the same build tree that was working stopped working after a mac system update. Basically when building libunwind there are multiple instances of stdbool.h not being found. If I just have a hello world that includes stdbool.h the bootstrapped compiler can't find it. The system one can find it.

[billhoffman]

I think the problem might be that something moved on the mac. If I run the clang with -v you can see these warnings:

ignoring nonexistent directory "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.0.sdk/usr/local/include"
ignoring nonexistent directory "/Users/hoffman/Work/llvm/llvm-project/build2/lib/include"
ignoring nonexistent directory "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.0.sdk/Library/Frameworks"
#include "..." search starts here:
#include <...> search starts here:
 /Users/hoffman/Work/llvm/llvm-project/libunwind/include
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.0.sdk/usr/include
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.0.sdk/System/Library/Frameworks (framework directory)
End of search list.

If you look for stdbool.h in the SDK directory you see this:

find /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs -name stdbool.h
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/stdbool.h
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/Kernel.framework/Versions/A/Headers/stdbool.h

[billhoffman]

So, I am not seeing the problem in the 19.x branch only in origin/main. So, it is likely an issue with llvm and not the system I am building on.