https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94905
Arseny Solokha <asolokha at gmx dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |asolokha at gmx dot com
--- Comment #3 from Arseny Solokha <asolokha at gmx dot com> ---
The best I've been able to come up with is the following, reduced from APL 1.8:
enum { MAX_RANK = 8 };
struct Shape {
Shape(int len) { rho[0] = len; }
Shape(Shape &other) {
for (int r = 0; r < MAX_RANK; ++r)
rho[r] = other.rho[r];
}
Shape insert_axis() const;
int rho[MAX_RANK];
};
int insert_axis_len;
Shape Shape::insert_axis() const {
{
Shape ret(insert_axis_len);
return ret;
}
}
% g++-10.1.0 -O2 -Wall -Werror -c fojcdnsn.cc
fojcdnsn.cc: In member function 'Shape Shape::insert_axis() const':
fojcdnsn.cc:8:27: error: ''target_mem_ref' not supported by
dump_expr<expression error>' may be used uninitialized in this function
[-Werror=maybe-uninitialized]
8 | rho[r] = other.rho[r];
| ~~~~~~~~~~~^
That's with gcc-10.1.0-RC-20200430; I failed to reproduce it at all with gcc 9.
However, without preprocessed source provided by the reporter it's impossible
to tell whether that's the issue in question.
So please, provide a self-contained testcase! It's not even necessary to
minimize it, as in many cases it's easy to do with tools like C-Reduce or newly
emerged C-Vise and can later be done by developers themselves. But without the
testcase developers cannot and likely won't do anything about the issue you
have in the first place.
