[Bug target/80993] New: [msp430] __attribute__((interrupt)) should imply __attribute__((used))

[awygle at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80993

            Bug ID: 80993
           Summary: [msp430] __attribute__((interrupt)) should imply
                    __attribute__((used))
           Product: gcc
           Version: 6.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: awygle at gmail dot com
  Target Milestone: ---

Enabling link-time optimization on the MSP430 causes any interrupt handlers
which are not called directly to be cheerfully eaten. Thus any interrupt causes
the processor to execute essentially random data, resulting in uncontrolled
jumps and general badness. This problem can be resolved with
__attribute__((used)), which should be implied by __attribute__((interrupt)).