[mlir] Allow CXX standard to be overridden

[nikalra]

MLIR previously hardcoded the CXX version to C++17. Updated to allow for the CXX version to be set by clients (mirrors other LLVM projects).

[llvmbot]

@llvm/pr-subscribers-mlir

Author: Nikhil Kalra (nikalra)

Changes

MLIR previously hardcoded the CXX version to C++17. Updated to allow for the CXX version to be set by clients (mirrors other LLVM projects).

---

Full diff: https://github.com/llvm/llvm-project/pull/112957.diff

1 Files Affected:

• (modified) mlir/CMakeLists.txt (+1-1)

diff --git a/mlir/CMakeLists.txt b/mlir/CMakeLists.txt
index c6d44908a1111d..350a8404783bba 100644
--- a/mlir/CMakeLists.txt
+++ b/mlir/CMakeLists.txt
@@ -16,7 +16,7 @@ endif()
 
 # Must go below project(..)
 include(GNUInstallDirs)
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 17 CACHE STRING "C++ standard to conform to")
 
 if(MLIR_STANDALONE_BUILD)
   find_package(LLVM CONFIG REQUIRED)