http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50960
--- Comment #13 from Tobias Burnus <burnus at gcc dot gnu.org> 2011-11-03
14:03:40 UTC ---
Patch for the issue of comment 5: Constants (PARAMETER) which are exists as
global static variables were not marked as TREE_READONLY.
With the patch below (not regtested), the function call is optimized away in:
module m
integer, parameter :: PARA(*) = [1,2,3,4,5,6,7,8,9,10]
end module m
subroutine test()
use m
integer :: i
i = 1
if (para(i) /= 1) call I_am_optimized_away()
end
--- a/gcc/fortran/trans-decl.c
+++ b/gcc/fortran/trans-decl.c
@@ -517,6 +517,9 @@ gfc_finish_var_decl (tree decl, gfc_symbol * sym)
/* If it wasn't used we wouldn't be getting it. */
TREE_USED (decl) = 1;
+ if (sym->attr.flavor == FL_PARAMETER)
+ TREE_READONLY (decl) = 1;
+
/* Chain this decl to the pending declarations. Don't do pushdecl()
because this would add them to the current scope rather than the
function scope. */
