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[PR fortran/89492, patch] - [9 Regression] Endless compilation of an invalid TRANSFER after r269177

From: Harald Anlauf <anlauf at gmx dot de>
To: gfortran <fortran at gcc dot gnu dot org>, gcc-patches <gcc-patches at gcc dot gnu dot org>
Date: Mon, 25 Feb 2019 22:49:16 +0100
Subject: [PR fortran/89492, patch] - [9 Regression] Endless compilation of an invalid TRANSFER after r269177

Rev. 269177 uncovered a latent issue in TRANSFER when the MOLD argument
had storage size 0, resulting in an infinite loop.  The attached patch
rejects illegal cases and handles the case where storage size of both
SOURCE and MOLD are 0.  It also verifies proper simplification for
some cases, some of which were not always properly handled before.

Thanks to Dominique for the heads-up which I initially missed.

Regtested on x86_64-pc-linux-gnu; the testcase is based on the report
and slightly extended.

OK for trunk?

Thanks, and sorry for any inconvenience caused,
Harald

2019-02-25  Harald Anlauf  <anlauf@gmx.de>

	PR fortran/89492
	* check.c (gfc_calculate_transfer_sizes): Handle cases where
	storage size of elements of MOLD is 0.

2019-02-25  Harald Anlauf  <anlauf@gmx.de>

	PR fortran/89492
	* gfortran.dg/pr89492.f90: New test.

Attachment: patch-pr89492
Description: Text document

Attachment: patch-pr89492-testcase
Description: Text document

Follow-Ups:
- Re: [PR fortran/89492, patch] - [9 Regression] Endless compilation of an invalid TRANSFER after r269177
  - From: Harald Anlauf

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