The attached patch adresses part of an issue raised in
PR fortran/63514 by enforcing F2008:C1282 and F2018:C1588.
Regression tested on x86_64-*-freebsd. OK to commit?
PS: the actual underlying point of PR fortran/63514 is bogus,
and I recommend that it be closed with WONTFIX.
2018-06-08 Steven G. Kargl <ka...@gcc.gnu.org>
PR fortran/63514
* symbol.c (gfc_add_volatile): Enforce F2008:C1282 and F2018:C1588.
2018-06-08 Steven G. Kargl <ka...@gcc.gnu.org>
PR fortran/63514
* gfortran.dg/pr63514.f90: New test.
--
Steve
Index: gcc/fortran/symbol.c
===================================================================
--- gcc/fortran/symbol.c (revision 261285)
+++ gcc/fortran/symbol.c (working copy)
@@ -1349,6 +1349,20 @@ gfc_add_volatile (symbol_attribute *attr, const char *
where))
return false;
+ /* F2008: C1282 A designator of a variable with the VOLATILE attribute
+ shall not appear in a pure subprogram.
+
+ F2018: C1588 A local variable of a pure subprogram, or of a BLOCK
+ construct within a pure subprogram, shall not have the SAVE or
+ VOLATILE attribute. */
+ if (gfc_pure (NULL))
+ {
+ gfc_error ("VOLATILE attribute at %L cannot be specified in a "
+ "PURE procedure", where);
+ return false;
+ }
+
+
attr->volatile_ = 1;
attr->volatile_ns = gfc_current_ns;
return check_conflict (attr, name, where);
Index: gcc/testsuite/gfortran.dg/pr63514.f90
===================================================================
--- gcc/testsuite/gfortran.dg/pr63514.f90 (nonexistent)
+++ gcc/testsuite/gfortran.dg/pr63514.f90 (working copy)
@@ -0,0 +1,41 @@
+! { dg-do compile }
+! PR fortran/63514.f90
+program foo
+
+ implicit none
+
+ integer, volatile :: n
+
+ n = 0
+
+ call bar
+ call bah
+
+ contains
+
+ subroutine bar
+ integer k
+ integer, volatile :: m
+ block
+ integer, save :: i
+ integer, volatile :: j
+ i = 42
+ j = 2 * i
+ k = i + j + n
+ end block
+ end subroutine bar
+
+ pure subroutine bah
+ integer k
+ integer, volatile :: m ! { dg-error "cannot be specified in a PURE" }
+ block
+ integer, save :: i ! { dg-error "cannot be specified in a PURE" }
+ integer, volatile :: j ! { dg-error "cannot be specified in a PURE" }
+ i = 42 ! { dg-error "has no IMPLICIT type" }
+ j = 2 * i ! { dg-error "has no IMPLICIT type" }
+ k = i + j + n
+ end block
+ m = k * m ! { dg-error "has no IMPLICIT type" }
+ end subroutine bah
+
+end program foo
