[FS#814] When LEDE is compiled with GCC 7 on at least ar71xx and brcm47xx, Dropbear won't accept connections

[LEDE Bugs]

The following task has a new comment added:

FS#814 - When LEDE is compiled with GCC 7 on at least ar71xx and brcm47xx, Dropbear won't accept connections
User who did this - Arjen de Korte (arjendekorte)

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Note that other packages are affected by similar problems with GCC 7. For instance, uhttpd will also fail on a Netgear WNDR4300 when compiled with -Os. For the moment, I would recommend to just stick to -O2 if a slight increase in size is acceptable.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=814#comment2973