[FS#830] No SSH Access to Device TP-Link MR3420 V2 (even in failsafe)

[LEDE Bugs]

The following task has a new comment added:

FS#830 - No SSH Access to Device TP-Link MR3420 V2 (even in failsafe)
User who did this - Kevin Darbyshire-Bryant (kdarbyshirebryant)

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There's a known 'disagreement' between gcc 7, mips, dropbear & '-Os' optimisation.  You could:  Not compile with gcc 7.  Or compile with gcc 7 but set the target optimisation flags from '-Os' to '-O2'.

Whether this is a gcc 7 bug, or a bug in an older 'libtommath/crypt' exposed by gcc 7 isn't clear.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=830#comment2766