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[Arm NN on Cortex-A9] Static build leads to "None of the preferred backends [CpuRef ] are supported" error at runtime

Hello ArmNN experts,
I'm currently facing an issue at runtime when using a statically built ArmNN lib.

I have been able to build a STATIC version of libarmnn with all dependancies and then build my own app for a Wandboard target (armv7).
At runtime I got this error: "ERROR: None of the preferred backends [CpuRef ] are supported. Current platform provides []"

When I compile SHARED libraries (*.so) the exact same app is running fine, and the inference is done as expected.

ArmNN version: 21.02
Model/Target: TFLite on armv7

Does anyone have an idea of a fix or additionnal investigations ??