| Issue |
132178
|
| Summary |
[libcxx] Ambiguous Reference to std::pair in SPEC2006 447.dealII Example When Using libc++
|
| Labels |
libc++
|
| Assignees |
|
| Reporter |
andrewW0210
|
When compiling the code from the SPEC2006 447.dealII benchmark with libc++, an ambiguous reference to std::pair occurs. The problematic code like this:
``` cpp
#include <utility>
namespace std {
template <typename T1, typename T2> struct pair;
} // namespace std
std::pair<unsigned, unsigned> test() { return std::make_pair(1u, 2u); }
```
The error message is:
```
test.cpp:6:6: error: reference to 'pair' is ambiguous
6 | std::pair<unsigned, unsigned> test() { return std::make_pair(1u, 2u); }
| ^
../riscv64-unknown-elf/include/c++/v1/__utility/pair.h:79:29: note: candidate found by name lookup is 'std::__1::pair'
79 | struct _LIBCPP_TEMPLATE_VIS pair
| ^
test.cpp:3:44: note: candidate found by name lookup is 'std::pair'
3 | template <typename T1, typename T2> struct pair;
| ^
1 error generated.
```
Is there a recommended approach to resolve this issue without modifying the SPEC2006 source code? Could libc++ provide a mechanism to handle such forward declarations gracefully?
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