re PR fortran/88249 (ICE in gfc_resolve_filepos, at fortran/io.c:2853)

2018-12-11  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/88249
	* gfortran.h: Update prototype for gfc_resolve_filepos().
	* io.c (gfc_resolve_filepos): Check for UNIT number if ERR= is present.
	Use passed in locus for error message.
	* resolve.c (gfc_resolve_code): Pass locus in gfc_resolve_filepos()
	call.

2018-12-11  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/88249
	* gfortran.dg/pr88249.f90: New test.

From-SVN: r267035

gcc/fortran/ChangeLog

+2018-12-11  Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/88249
+	* gfortran.h: Update prototype for gfc_resolve_filepos().
+	* io.c (gfc_resolve_filepos): Check for UNIT number if ERR= is present.
+	Use passed in locus for error message.
+	* resolve.c (gfc_resolve_code): Pass locus in gfc_resolve_filepos()
+	call.
+
 2018-12-10  Steven G. Kargl  <kargl@gcc.gnu.org>
 
 	PR fortran/97922

gcc/fortran/gfortran.h

@@ -3395,7 +3395,7 @@ bool gfc_resolve_open (gfc_open *);
 void gfc_free_close (gfc_close *);
 bool gfc_resolve_close (gfc_close *);
 void gfc_free_filepos (gfc_filepos *);
-bool gfc_resolve_filepos (gfc_filepos *);
+bool gfc_resolve_filepos (gfc_filepos *, locus *);
 void gfc_free_inquire (gfc_inquire *);
 bool gfc_resolve_inquire (gfc_inquire *);
 void gfc_free_dt (gfc_dt *);

gcc/fortran/io.c

@@ -2849,22 +2849,21 @@ cleanup:
 
 
 bool
-gfc_resolve_filepos (gfc_filepos *fp)
+gfc_resolve_filepos (gfc_filepos *fp, locus *where)
 {
   RESOLVE_TAG (&tag_unit, fp->unit);
   RESOLVE_TAG (&tag_iostat, fp->iostat);
   RESOLVE_TAG (&tag_iomsg, fp->iomsg);
-  if (!gfc_reference_st_label (fp->err, ST_LABEL_TARGET))
-    return false;
 
-  if (!fp->unit && (fp->iostat || fp->iomsg))
+  if (!fp->unit && (fp->iostat || fp->iomsg || fp->err))
     {
-      locus where;
-      where = fp->iostat ? fp->iostat->where : fp->iomsg->where;
-      gfc_error ("UNIT number missing in statement at %L", &where);
+      gfc_error ("UNIT number missing in statement at %L", where);
       return false;
     }
 
+  if (!gfc_reference_st_label (fp->err, ST_LABEL_TARGET))
+    return false;
+
   if (fp->unit->expr_type == EXPR_CONSTANT
       && fp->unit->ts.type == BT_INTEGER
       && mpz_sgn (fp->unit->value.integer) < 0)

gcc/fortran/resolve.c

@@ -11545,7 +11545,7 @@ start:
 	case EXEC_ENDFILE:
 	case EXEC_REWIND:
 	case EXEC_FLUSH:
-	  if (!gfc_resolve_filepos (code->ext.filepos))
+	  if (!gfc_resolve_filepos (code->ext.filepos, &code->loc))
 	    break;
 
 	  resolve_branch (code->ext.filepos->err, code);

gcc/testsuite/ChangeLog

+2018-12-11  Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	PR fortran/88249
+	* gfortran.dg/pr88249.f90: New test.
+
 2018-12-11  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/80520

gcc/testsuite/gfortran.dg/pr88249.f90

+! { dg-do compile }
+program p
+   backspace (err=1) ! { dg-error "UNIT number missing" }
+   endfile (err=1)   ! { dg-error "UNIT number missing" }
+   flush (err=1)     ! { dg-error "UNIT number missing" }
+   rewind (err=1)    ! { dg-error "UNIT number missing" }
+end