https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99577
Bug ID: 99577
Summary: Non-constant (but actually constant) initializers
referencing other constants no longer diagnosed as of
GCC 8
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: harald at gigawatt dot nl
Target Milestone: ---
GCC 8 and newer no longer issue an error for
const int i = 0;
const int j = i;
Up until GCC 7, this resulted in
test.c:2:15: error: initializer element is not constant
const int j = i;
^
As in the similar (and perhaps related?) bug #66618, the standard does not
require a diagnostic for this code, but this code is not portable, it gets
rejected by some other compilers, so an option in GCC to diagnose this would be
useful.
This bug is the opposite of bug #53091, which asks for this to be accepted and
was never updated after GCC started to accept it. As noted in that bug, clang
accepts this as well without any diagnostic. I will report it as an issue to
them too, if it has not been reported already.
