[llvm-bugs] [Bug 48191] New: ASTMatchers.h imposes link-dependency on LLVMFrontendOpenMP

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48191

            Bug ID: 48191
           Summary: ASTMatchers.h imposes link-dependency on
                    LLVMFrontendOpenMP
           Product: clang
           Version: 11.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Tooling
          Assignee: unassignedclangbugs at nondot.org
          Reporter: anton.kreuzkamp at kdab.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 24165
  --> https://bugs.llvm.org/attachment.cgi?id=24165&action=edit
CMakeLists.txt used to setup compilation for minimal example

One could argue whether this is a bug, but it seems at least unintended that
since clang 11.0 ASTMatchers.h imposes a dependency on libLLVMFrontendOpenMP. 

I.e. apparently any clang tool that uses AST matchers must link against
libLLVMFrontendOpenMP.

Attached is a minimal example to reproduce the bug. It's an empty program,
doing nothing but #include "ASTMatchers.h". It's then linked against clang-cpp
and LLVMCore, which should be enough and was enough with clang 10. Now it gives
a linker error.

This can be worked around, by adding `LLVMFrontendOpenMP` to the list of linked
libraries.

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