https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67333
Mikhail Maltsev miyuki at gcc dot gnu.org changed:
What|Removed |Added
CC||miyuki at gcc dot gnu.org
--- Comment #1 from Mikhail Maltsev miyuki at gcc dot gnu.org ---
EDG accepts the first testcase. The second one is rejected, but presumably due
to incomplete C++14 support.
In potential_constant_expression_1 we have a check:
if (TREE_THIS_VOLATILE (t))
{
if (flags tf_error)
error (expression %qE has side-effects, t);
The comment in tree.h says:
/* Nonzero means this expression is volatile in the C sense:
its address should be of type `volatile WHATEVER *'.
In other words, the declared item is volatile qualified.
...
If this bit is set in an expression, so is TREE_SIDE_EFFECTS. */
In our case t is:
(gdb) p t
$10 = var_decl 0x766a7cf0 meow
(gdb) pt
warning: Expression is not an assignment (and might have no effect)
var_decl 0x766a7cf0 meow
type array_type 0x76800c78
type integer_type 0x76800a80 int volatile type_6 SI
size integer_cst 0x766bd0a8 constant 32
unit size integer_cst 0x766bd0c0 constant 4
align 32 symtab 0 alias set -1 canonical type 0x76800a80
precision 32 min integer_cst 0x766bd060 -2147483648 max integer_cst
0x766bd078 2147483647
pointer_to_this pointer_type 0x76800d20
TI
size integer_cst 0x7669bea0 constant 128
unit size integer_cst 0x7669beb8 constant 16
align 32 symtab 0 alias set -1 canonical type 0x76800c78
domain integer_type 0x76800b28 type integer_type 0x7669f1f8
sizetype
type_6 DI
size integer_cst 0x7669be58 constant 64
unit size integer_cst 0x7669be70 constant 8
align 64 symtab 0 alias set -1 canonical type 0x76800b28
precision 64 min integer_cst 0x7669be88 0 max integer_cst 0x7680adc8
3
pointer_to_this pointer_type 0x768133f0
side-effects addressable volatile used tree_1 decl_5 TI file
/home/miyuki/gcc/test/meow/meow.cc line 15 col 18 size integer_cst
0x7669bea0 128 unit size integer_cst 0x7669beb8 16
align 32 context function_decl 0x767ffe00 main
I.e. the condition is probably wrong and we should also check that t is an
expression, not a declaration.
