https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122395
Bug ID: 122395
Summary: Wchanges-meaning false error ?
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: dcb314 at hotmail dot com
Target Milestone: ---
The following C++ code is accepted by clang++:
struct Expr
{
int a;
char * b;
};
struct StmtInfo {
const Expr *V;
const Expr *X;
const Expr *Expr;
// TODO: OpenACC: We should expand this as we're implementing the other
// atomic construct kinds.
};
foundBugs $ clang++ -c -O2 -Wall bug1130.cc
foundBugs $
but g++ rejects it:
foundBugs $ ~/gcc/results/bin/g++ -c -O2 -Wall bug1130.cc
bug1130.cc:11:17: error: declaration of ‘const Expr* StmtInfo::Expr’ changes
meaning of ‘Expr’ [-Wchanges-meaning]
11 | const Expr *Expr;
| ^~~~
bug1130.cc:11:11: note: used here to mean ‘struct Expr’
11 | const Expr *Expr;
| ^~~~
bug1130.cc:2:8: note: declared here
2 | struct Expr
| ^~~~
foundBugs $
foundBugs $ ~/gcc/results/bin/g++ -v
Using built-in specs.
COLLECT_GCC=/home/dcb42/gcc/results/bin/g++
COLLECT_LTO_WRAPPER=/home/dcb42/gcc/results.20251022.asan.ubsan/libexec/gcc/x86_64-pc-linux-gnu/16.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../trunk/configure
--prefix=/home/dcb42/gcc/results.20251022.asan.ubsan --disable-multilib
--disable-bootstrap --with-build-config='bootstrap-asan bootstrap-ubsan'
--with-pkgversion=6c01778628d93c51 --with-isl
--enable-checking=df,extra,fold,rtl,yes --disable-doc
--enable-languages=c,c++,fortran
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.0 20251022 (experimental) (6c01778628d93c51)
foundBugs $
This is from clang++ source code, so it is preventing
building clang and clang++.
