Add compiler flags
Add compiler flags

From GCC:
  Attempt to merge identical constants and identical variables.

  This option implies -fmerge-constants. In addition to
  -fmerge-constants this considers e.g. even constant initialized arrays
  or initialized constant variables with integral or floating-point
  types. Languages like C or C++ require each variable, including
  multiple instances of the same variable in recursive calls, to have
  distinct locations, so using this option results in non-conforming
  behavior.

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