llvm dev - Jun 2021 - Issues with the precompiled LLVM 12 for macOS

Hey folks,

I just wanted to send you a heads up that there is an issue with the precompiled
LLVM package for macOS.
The LLVMConfig.cmake has a very specific path hardcoded in it:

    set_target_properties(LLVMSupport PROPERTIES
      INTERFACE_LINK_LIBRARIES
"m;ZLIB::ZLIB;/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.1.sdk/usr/lib/libcurses.tbd;LLVMDemangle"
    )

Any build that depends on LLVMSupport fails unless there is this very specific
macOS SDK present.

The workaround is rather straightforward:

    find_package(LLVM REQUIRED CONFIG)

    if (APPLE)
      if (LLVM_VERSION_MAJOR EQUAL 12)
        set_target_properties(LLVMSupport PROPERTIES
          INTERFACE_LINK_LIBRARIES "z;curses;m;LLVMDemangle")
      endif()
    endif()

It never happened before at least since the version 3.9, so I guess an automated
check might be an overkill.
But I'm curious how can we prevent this from happening again?

Cheers,
Alex.

Hi Alex,

Wouldn't this be configured by a person/project providing these packages 
for macOS? AFAIK, this is not hard-coded in LLVM itself, is it?

-Andrzej

On 29/06/2021 08:39, Alex Denisov via llvm-dev wrote:
> Hey folks,
> 
> I just wanted to send you a heads up that there is an issue with the
precompiled LLVM package for macOS.
> The LLVMConfig.cmake has a very specific path hardcoded in it:
> 
>      set_target_properties(LLVMSupport PROPERTIES
>        INTERFACE_LINK_LIBRARIES
"m;ZLIB::ZLIB;/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.1.sdk/usr/lib/libcurses.tbd;LLVMDemangle"
>      )
> 
> Any build that depends on LLVMSupport fails unless there is this very
specific macOS SDK present.
> 
> The workaround is rather straightforward:
> 
>      find_package(LLVM REQUIRED CONFIG)
> 
>      if (APPLE)
>        if (LLVM_VERSION_MAJOR EQUAL 12)
>          set_target_properties(LLVMSupport PROPERTIES
>            INTERFACE_LINK_LIBRARIES "z;curses;m;LLVMDemangle")
>        endif()
>      endif()
> 
> It never happened before at least since the version 3.9, so I guess an
automated check might be an overkill.
> But I'm curious how can we prevent this from happening again?
> 
> Cheers,
> Alex.
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