[Patch] PR fortran/93499 - ICE on division by zero in declaration statements

[Harald Anlauf]

Hi,

the attached should be mostly self-explaining.  Division by zero handling
appeared to be incomplete.  It was not dealt with properly when occurring
in declaration statements.  We now try to handle this.

OK for mainline?

Thanks,
Harald



PR fortran/93499 - ICE on division by zero in declaration statements

	Division by zero in declaration statements could sometimes
	generate NULL pointers being passed around that lead to ICEs.

gcc/fortran/ChangeLog:

2020-05-09  Harald Anlauf  <anlauf@gmx.de>

	PR fortran/93499
	* arith.c (gfc_divide): Catch division by zero.
	(eval_intrinsic_f3): Safeguard for NULL operands.

gcc/testsuite/ChangeLog:

2020-05-09  Harald Anlauf  <anlauf@gmx.de>

	PR fortran/93499
	* gfortran.dg/pr93499.f90: New test.

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