https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123583
Bug ID: 123583
Summary: Named address space qualifier causes undeclared
identifier error
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: saaadhu at gcc dot gnu.org
Target Milestone: ---
The below code triggers a compilation error, even though __memx is a valid
address space qualifier.
$ cat test.c
void h() {
if(1)
;
__memx const int *x = 0;
}
$ ~/install/bin/avr-gcc test.c
test.c: In function:
test.c:6:3: error:__mem undeclared (first use in this function)
6 | __memx const int *x = 0;
| ^~~~~~
test.c:6:3: note: each undeclared identifier is reported only once for each
function it appears in
test.c:6:9: error: expected beforeconst
6 | __memx const int *x = 0;
| ^~~~~~
| ;
$ avr-gcc --version
avr-gcc (GCC) 16.0.1 20260114 (experimental)
Copyright (C) 2026 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Swapping the order of the qualifiers (i.e. const __memx) makes the error go
away, and so does adding an extra token (say ;) after the between the ; and
__memx.
