[PATCH] D80359: Add a CMake fatal error when someone tries to configure flang without MLIR

[Mehdi AMINI via Phabricator via llvm-commits]

mehdi_amini created this revision.
mehdi_amini added a reviewer: DavidTruby.
Herald added subscribers: llvm-commits, stephenneuendorffer, aartbik, rriddle, mgorny.
Herald added a reviewer: sscalpone.
Herald added a project: LLVM.

This is more friendly than the "Unknown CMake command “mlir_tablegen”."
that would be issued instead.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D80359

Files:
  flang/CMakeLists.txt


Index: flang/CMakeLists.txt
===================================================================
--- flang/CMakeLists.txt
+++ flang/CMakeLists.txt
@@ -127,6 +127,10 @@
   endif()
 
 else()
+  if(NOT "mlir" IN_LIST LLVM_ENABLE_PROJECTS)
+    message(FATAL_ERROR "'mlir' is required in LLVM_ENABLE_PROJECTS to build flang")
+  endif()
+
   option(FLANG_INCLUDE_TESTS
          "Generate build targets for the Flang unit tests."
          ${LLVM_INCLUDE_TESTS})


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