re PR fortran/79929 (Bogus Warning: '__builtin_memset': specified size…

re PR fortran/79929 (Bogus Warning: '__builtin_memset': specified size 4294967291 exceeds maximum object size 2147483647)

2018-03-18  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/79929
	* gfortran.dg/warn_concat.f90: New test.

From-SVN: r258630

gcc/testsuite/ChangeLog

+2018-03-18  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	PR fortran/79929
+	* gfortran.dg/warn_concat.f90: New test.
+
 2018-03-16  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/84899

gcc/testsuite/gfortran.dg/warn_concat.f90

+! { dg-do compile }
+! { dg-additional-options "-Wall -O3" }
+! PR 79929 - this used to give a warning.
+! Test case by Harald Anlauf.
+subroutine gfcbug138 (yerrmsg)
+  character(*) :: yerrmsg
+  yerrmsg = ""
+  yerrmsg = "bug: " // yerrmsg
+end subroutine gfcbug138