[PATCH] Fix PR77765

[Cesar Philippidis <cesar_philippidis@mentor.com>]

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PR77765 exposed an ICE triggered in gfortran's acc routine parser by an
uninitialized proc_name. That situation occurred because the function
containing the acc routine directive has an error, so
gfc_current_ns->proc_name was never set.

Although it could be argued that the acc routine parser should not run
if any errors have been detected inside the routine containing such a
directive, this patch just teaches gfc_match_oacc_routine to check for
the existence of gfc_current_ns->proc_name before comparing the
procedure's name with the routine name specified by the user.

Is this patch OK for trunk and gcc7?

Thanks,
Cesar

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2017-06-29  Cesar Philippidis  <cesar@codesourcery.com>

	PR fortran/77765
	gcc/fortran/
	* openmp.c (gfc_match_oacc_routine): Check if proc_name exist before
	comparing the routine name against it.

	gcc/testsuite/
	* gfortran.dg/goacc/pr77765.f90: New test.


diff --git a/gcc/fortran/openmp.c b/gcc/fortran/openmp.c
index 1d191d2..236ecb2 100644
--- a/gcc/fortran/openmp.c
+++ b/gcc/fortran/openmp.c
@@ -2474,7 +2474,8 @@ gfc_match_oacc_routine (void)
 	  if (st)
 	    {
 	      sym = st->n.sym;
-	      if (strcmp (sym->name, gfc_current_ns->proc_name->name) == 0)
+	      if (gfc_current_ns->proc_name != NULL
+		  && strcmp (sym->name, gfc_current_ns->proc_name->name) == 0)
 	        sym = NULL;
 	    }
 	  else if (isym == NULL)
diff --git a/gcc/testsuite/gfortran.dg/goacc/pr77765.f90 b/gcc/testsuite/gfortran.dg/goacc/pr77765.f90
new file mode 100644
index 0000000..3819cf7
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/goacc/pr77765.f90
@@ -0,0 +1,19 @@
+! Test the presence of an ACC ROUTINE directive inside a function
+! containg an error.
+
+! { dg-do compile }
+
+module m
+contains
+  recursive function f(x)
+  end function f
+  recursive function f(x)
+    !$acc routine (f)
+  end function f
+end module m
+
+! { dg-error "Procedure 'f' at .1. is already defined" "" { target *-*-* } 8 }
+! { dg-error "Duplicate RECURSIVE attribute specified" "" { target *-*-* } 8 }
+! { dg-error ".1." "" { target *-*-* } 10 }
+! { dg-error "Unexpected ..ACC ROUTINE" "" { target *-*-* } 11 }
+! { dg-error "Expecting END MODULE statement" "" { target *-*-* } 12 }