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  MCU: STM32F4 (ARM Cortex M4)
  Build environment: arm-none-eabi-gcc 4.8.4 20140725

  My goal is to build an image that can be run from any properly-aligned
  offset in internal flash (i.e., position-independent).  I found the
  following set of gcc flags that achieves this goal:

    # Generate position independent code.

    -fPIC

  # Access bss via the GOT.
  -mno-pic-data-is-text-relative

    # GOT is not PC-relative; store GOT location in a register.
  -msingle-pic-base

    # Store GOT location in r9.
  -mpic-register=r9