[llvm-bugs] [Bug 45575] New: flang lacks mlir dependency

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45575

            Bug ID: 45575
           Summary: flang lacks mlir dependency
           Product: Build scripts
           Version: trunk
          Hardware: PC
                OS: Solaris
            Status: NEW
          Severity: normal
          Priority: P
         Component: cmake
          Assignee: unassignedbugs at nondot.org
          Reporter: ro at gcc.gnu.org
                CC: llvm-bugs at lists.llvm.org

When trying to build trunk with flang included, I initially used

cmake -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra;compiler-rt;polly;flang"
...

Unfortunately, this failed rather obscurely with

CMake Error at
/vol/llvm/src/llvm-project/dist/flang/include/flang/Optimizer/Dialect/CMakeLists.txt:5
(mlir_tablegen):
  Unknown CMake command "mlir_tablegen".

I'd have expected either that flang adds the required dependency on mlir
automatically
or at the very least clearly diagnoses early on that it's missing.

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