re PR target/70713 (msp430 interrupt attribute prevents overriding weak symbols)

re PR target/70713 (msp430 interrupt attribute prevents overriding weak symbols)

2016-09-13  Joe Seymour  <joe.s@somniumtech.com>

gcc/
PR target/70713
* config/msp430/msp430.c (msp430_start_function): Emit an error
if a function is both weak and specifies an interrupt number.

gcc/testsuite/
PR target/70713
* gcc.target/msp430/function-attributes-1.c: New test.
* gcc.target/msp430/function-attributes-2.c: New test.
* gcc.target/msp430/function-attributes-3.c: New test.

From-SVN: r240123