aeubanks added a comment.
$ cat /tmp/a.cc
typedef struct Test {
} Test;
void f() {
const Test constVal;
_Generic(constVal, const Test : 0);
}
$ ./build/rel/bin/clang -fsyntax-only -x c++ /tmp/a.cc -Wall
/tmp/a.cc:6:28: warning: due to lvalue conversion of the controlling
expression, association of type 'const Test' will never be selected because it
is qualified [-Wunreachable-code-generic-assoc]
_Generic(constVal, const Test : 0);
^
/tmp/a.cc:6:35: warning: expression result unused [-Wunused-value]
_Generic(constVal, const Test : 0);
^
2 warnings generated.
$ ./build/rel/bin/clang -fsyntax-only -x c /tmp/a.cc -Wall
/tmp/a.cc:6:28: warning: due to lvalue conversion of the controlling
expression, association of type 'const Test' (aka 'const struct Test') will
never be selected because it is qualified [-Wunreachable-code-generic-assoc]
_Generic(constVal, const Test : 0);
^
/tmp/a.cc:6:12: error: controlling expression type 'Test' (aka 'struct Test')
not compatible with any generic association type
_Generic(constVal, const Test : 0);
^~~~~~~~
1 warning and 1 error generated.
the C++ case looks wrong, it's warning that `const Test` can't be selected then
selects it
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D125259/new/
https://reviews.llvm.org/D125259
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