Fix a linker error: undefined kMaxBufferCount (#2458)
When building with a recent version of xt-clang and -std=c++, the linker errs on missing definition of a static constexpr class member. In C++11, static class members still had to be defined in a C++11 file and TFLM code is expected to be compatible with C++11.
BUG=323856831
diff --git a/tensorflow/lite/micro/memory_planner/linear_memory_planner.cc b/tensorflow/lite/micro/memory_planner/linear_memory_planner.cc
index 5c6afb5..00d707a 100644
--- a/tensorflow/lite/micro/memory_planner/linear_memory_planner.cc
+++ b/tensorflow/lite/micro/memory_planner/linear_memory_planner.cc
@@ -19,6 +19,9 @@
namespace tflite {
+// C++11 requires defining a constexpr static class member in a .cc file
+constexpr int tflite::LinearMemoryPlanner::kMaxBufferCount;
+
LinearMemoryPlanner::LinearMemoryPlanner()
: current_buffer_count_(0), next_free_offset_(0) {}
LinearMemoryPlanner::~LinearMemoryPlanner() {}
