[Bug c++/67559] New: [C++] [regression] Passing non-trivially copyable objects through '...' doesn't generate warning or error
bisqwit at iki dot fi
gcc-bugzilla@gcc.gnu.org
Sat Sep 12 18:35:00 GMT 2015
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67559
Bug ID: 67559
Summary: [C++] [regression] Passing non-trivially copyable
objects through '...' doesn't generate warning or
error
Product: gcc
Version: 5.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: bisqwit at iki dot fi
Target Milestone: ---
In GCC 4.9, this code generates an error. In GCC 5.2, it generates no warning
or error, even on -Wall -Wextra -pedantic.
struct test { test(){} ~test(){} };
void a(int, ...) {}
int main()
{
test object;
a(5, object);
}
Tried different standards modes: -std=c++98, -std=c++03, -std=c++11, -std=c++14
Tried also lambda functions with variadic args, same result.
The error message in GCC 4.9 (and earier down to 4.6) was:
cannot pass objects of non-trivially-copyable type 'struct test' through
'...'
In GCC 5.2, no error or warning message is given in any of the standard modes.
In the standard version C++03, this behavior is undefined (§5.2.2/7). In C++11,
it is conditionally supported with implementation-defined semantics.
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