https://llvm.org/bugs/show_bug.cgi?id=31002
Bug ID: 31002
Summary: clang rejects valid C++ code with variable argument
function
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: s...@cs.ucdavis.edu
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
Classification: Unclassified
It seems to affect all clang versions since at least as early as 3.2.x, and is
also incorrectly rejected by ICC.
Both GCC and MSVC correctly accept the code.
The code is accepted if the destructor is commented out.
$ clang++ -v
clang version 4.0.0 (trunk 286715)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$
$ g++-6.2 small.cpp
$
$ clang++ small.cpp
small.cpp:12:20: error: second argument to 'va_arg' is of non-POD type 'A'
[-Wnon-pod-varargs]
A v = va_arg (a, A);
^
/usr/local/clang-trunk/bin/../lib/clang/4.0.0/include/stdarg.h:35:50: note:
expanded from macro 'va_arg'
#define va_arg(ap, type) __builtin_va_arg(ap, type)
^~~~
small.cpp:19:11: error: cannot pass object of non-POD type 'A' through variadic
function; call will abort at runtime
[-Wnon-pod-varargs]
foo (t, t);
^
2 errors generated.
$
----------------------------
#include <cstdarg>
struct A
{
virtual ~A () {}
};
void foo (A p, ...)
{
va_list a;
va_start (a, p);
A v = va_arg (a, A);
va_end (a);
}
int main ()
{
A t;
foo (t, t);
return 0;
}
--
You are receiving this mail because:
You are on the CC list for the bug.
_______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
