[CMake] Propagate static extensions to LLVMExtensions object library

[tambre]

Summary

Since 43ceb74eb1a5801662419fb66a6bf0d5414f1ec5 llvm-shlib links against the object libraries instead of static libraries.
This causes build failures if building Polly statically into LLVM as the dependency on it isn't propagated through LLVMExtension's object library variant.

Simply attach the transitive dependency to the object variant to fix this.
Fixes PR 49843.

[tambre]

@bjope Could you try without your workaround from https://reviews.llvm.org/rGd66f9c4f1e83e69abf75f97cb5f8fd1dc9422357 with this patch? I think this should fix the lack of include directory propagation that likely caused your issue.

[bjope]

In D99886#2669086, @tambre wrote:

@bjope Could you try without your workaround from https://reviews.llvm.org/rGd66f9c4f1e83e69abf75f97cb5f8fd1dc9422357 with this patch? I think this should fix the lack of include directory propagation that likely caused your issue.

I've tried it but this does not help for the problem with Z3.

[tstellar]

In D99886#2669086, @tambre wrote:

@bjope Could you try without your workaround from https://reviews.llvm.org/rGd66f9c4f1e83e69abf75f97cb5f8fd1dc9422357 with this patch? I think this should fix the lack of include directory propagation that likely caused your issue.

I'm planning to revert d66f9c4f1e along with 43ceb74eb. I"m just waiting for my test build to finish.

[tambre]

In D99886#2669119, @tstellar wrote:

In D99886#2669086, @tambre wrote:

@bjope Could you try without your workaround from https://reviews.llvm.org/rGd66f9c4f1e83e69abf75f97cb5f8fd1dc9422357 with this patch? I think this should fix the lack of include directory propagation that likely caused your issue.

I'm planning to revert d66f9c4f1e along with 43ceb74eb. I"m just waiting for my test build to finish.

Thanks for the info. Abandoning this as a result.

llvm/cmake/modules/AddLLVM.cmake

function(process_llvm_pass_plugins)
   else()
       include(LLVMConfigExtensions)
   endif()
 
   # Add static plugins to the Extension component
   foreach(llvm_extension ${LLVM_STATIC_EXTENSIONS})
       set_property(TARGET LLVMExtensions APPEND PROPERTY LINK_LIBRARIES ${llvm_extension})
       set_property(TARGET LLVMExtensions APPEND PROPERTY INTERFACE_LINK_LIBRARIES ${llvm_extension})
+      set_property(TARGET obj.LLVMExtensions APPEND PROPERTY INTERFACE_LINK_LIBRARIES ${llvm_extension})
   endforeach()
 
   # Eventually generate the extension headers, and store config to a cmake file
   # for usage in third-party configuration.
   if(ARG_GEN_CONFIG)
 
       ## Part 1: Extension header to be included whenever we need extension
       #  processing.