[FS#637] GDB server doesn't work

[LEDE Bugs]

The following task has a new comment added:

FS#637 - GDB server doesn't work
User who did this - Yousong Zhou (yousong)

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For the record, that sigprocmask call only appears in the version bump from gdb 7.11.1 to 7.12.1.

Thanks for taking time to report and narrow the issue down to this level.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=637#comment2206