Fix MacOS build: static constexpr must be defined

    This can be removed in C++17.

--

PiperOrigin-RevId: 246827022

diff --git a/mlir/lib/IR/StandardTypes.cpp b/mlir/lib/IR/StandardTypes.cpp
index c14a6b8..036fd09 100644 (file)
--- a/mlir/lib/IR/StandardTypes.cpp
+++ b/mlir/lib/IR/StandardTypes.cpp
@@ -31,6 +31,9 @@ using namespace mlir::detail;
 // Integer Type
 //===----------------------------------------------------------------------===//
 
+// static constexpr must have a definition (until in C++17 and inline variable).
+constexpr unsigned IntegerType::kMaxWidth;
+
 /// Verify the construction of an integer type.
 LogicalResult IntegerType::verifyConstructionInvariants(
     llvm::Optional<Location> loc, MLIRContext *context, unsigned width) {