https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109975
Bug ID: 109975
Summary: error: '(((int*)(&<anonymous>.X::a)) != 0)' is not a
constant expression
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ed at catmur dot uk
Target Milestone: ---
struct X { int a[1]; };
constexpr bool b = (X{}.a != 0);
<source>:7:27: error: '(((int*)(&<anonymous>.X::a)) != 0)' is not a constant
expression
7 | constexpr bool b = (X{}.a != 0);
| ~~~~~~~^~~~~
AFAICT this does not fall foul of anything in [expr.const]. Other compilers
accept, with a tautological-compare warning in the case of clang.
Similar to bug 71962, but this happens without enabling sanitizer.
