What steps will reproduce the problem?
1. Download clang-failure.cpp
2. Compile with gcc command, everything works.
---------------------------------------------------------------------
$ g++ clang-failure.cpp libgtest.a -lpthread
$
---------------------------------------------------------------------
3. Compile with clang++
---------------------------------------------------------------------
$ clang++ -lpthread clang-failure.cpp libgtest.a -lpthread
clang-failure.cpp:21:13: error: 'operator type-parameter-0-0 *' is a private
member of 'A'
EXPECT_EQ(A(), A());
~~~~~~~~~~^~~~~~~~~
/usr/include/gtest/gtest.h:1848:55: note: expanded from:
EqHelper<GTEST_IS_NULL_LITERAL_(expected)>::Compare, \
^
/usr/include/gtest/internal/gtest-internal.h:162:54: note: expanded from:
(sizeof(::testing::internal::IsNullLiteralHelper(x)) == 1)
^
/usr/include/gtest/gtest_pred_impl.h:162:23: note: expanded from:
GTEST_PRED_FORMAT2_(pred_format, v1, v2, GTEST_NONFATAL_FAILURE_)
^
/usr/include/gtest/gtest_pred_impl.h:147:17: note: expanded from:
GTEST_ASSERT_(pred_format(#v1, #v2, v1, v2),\
^
/usr/include/gtest/gtest_pred_impl.h:77:52: note: expanded from:
if (const ::testing::AssertionResult gtest_ar = (expression)) \
^~~~~~~~~~
clang-failure.cpp:7:26: note: declared private here
template<typename T> operator T*(); // compile-time guard
^
1 error generated.
$
---------------------------------------------------------------------
Problem appears to be caused by clang trying to convert the class to go via the
varargs (which only accept POD).
A work around for this is to define;
---------------------------------------------------------------------
namespace testing {
namespace internal {
char (&IsNullLiteralHelper(const A&))[2];
}
}
---------------------------------------------------------------------
More information at;
https://code.google.com/p/googletest/source/browse/trunk/include/gtest/internal/
gtest-internal.h
---------------------------------------------------------------------
// Two overloaded helpers for checking at compile time whether an
// expression is a null pointer literal (i.e. NULL or any 0-valued
// compile-time integral constant). Their return values have
// different sizes, so we can use sizeof() to test which version is
// picked by the compiler. These helpers have no implementations, as
// we only need their signatures.
//
// Given IsNullLiteralHelper(x), the compiler will pick the first
// version if x can be implicitly converted to Secret*, and pick the
// second version otherwise. Since Secret is a secret and incomplete
// type, the only expression a user can write that has type Secret* is
// a null pointer literal. Therefore, we know that x is a null
// pointer literal if and only if the first version is picked by the
// compiler.
char IsNullLiteralHelper(Secret* p);
char (&IsNullLiteralHelper(...))[2]; // NOLINT
// A compile-time bool constant that is true if and only if x is a
// null pointer literal (i.e. NULL or any 0-valued compile-time
// integral constant).
#ifdef GTEST_ELLIPSIS_NEEDS_POD_
// We lose support for NULL detection where the compiler doesn't like
// passing non-POD classes through ellipsis (...).
# define GTEST_IS_NULL_LITERAL_(x) false
#else
# define GTEST_IS_NULL_LITERAL_(x) \
(sizeof(::testing::internal::IsNullLiteralHelper(x)) == 1)
#endif // GTEST_ELLIPSIS_NEEDS_POD_
---------------------------------------------------------------------
What version of Google Test are you using? On what operating system?
gtest 1.6.0-1ubuntu4, Linux Ubuntu Precise.
ii clang 3.0-6ubuntu3
Low-Level Virtual Machine (LLVM), C language
family frontend
ii clang-format 1.191733.53539707
clang-format
ii clang-tools 3.2-1
Clang tools
ii libclang-common-dev 3.0-6ubuntu3
clang library - Common development package
ii libllvm3.0 3.0-4ubuntu1
Low-Level Virtual Machine (LLVM), runtime
library
ii libllvm3.0:i386 3.0-4ubuntu1
Low-Level Virtual Machine (LLVM), runtime
library
ii llvm-3.0 3.0-4ubuntu1
Low-Level Virtual Machine (LLVM)
ii llvm-3.0-dev 3.0-4ubuntu1
Low-Level Virtual Machine (LLVM), libraries and
headers
ii llvm-3.0-runtime 3.0-4ubuntu1
Low-Level Virtual Machine (LLVM), bytecode
interpreter
ii gcc-4.6 4.6.3-1ubuntu5
GNU C compiler
ii gcc-4.6-base 4.6.3-1ubuntu5
GCC, the GNU Compiler Collection (base package)
ii gcc-4.6-base:i386 4.6.3-1ubuntu5
GCC, the GNU Compiler Collection (base package)
ii gcc-4.6-multilib 4.6.3-1ubuntu5
GNU C compiler (multilib files)
$ gcc --version
gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3
$ clang --version
Ubuntu clang version 3.0-6ubuntu3 (tags/RELEASE_30/final) (based on LLVM 3.0)
Target: x86_64-pc-linux-gnu
Thread model: posix
Original issue reported on code.google.com by mit...@mithis.com on 10 Oct 2013 at 7:07
Original issue reported on code.google.com by
mit...@mithis.comon 10 Oct 2013 at 7:07Attachments: