| Issue |
55376
|
| Summary |
Checking whether clang++ supports C++17 features failed
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
huxiaoheng44
|
Here is a case generated when I compiled an application called moose with LLVM at the stage of configure, more specifically, Checking whether clang++ supports C++17 features. I extracted the codes raised the error.
```
//test.cpp
#include <initializer_list>
#include <utility>
#include <type_traits>
namespace test_structured_bindings
{
int arr[2] = { 1, 2 };
std::pair<int, int> pr = { 1, 2 };
auto f1() -> int(&)[2]
{
return arr;
}
auto f2() -> std::pair<int, int>&
{
return pr;
}
struct S
{
int x1 : 2;
volatile double y1;
};
S f3()
{
return {};
}
auto [ x1, y1 ] = f1();
auto& [ xr1, yr1 ] = f1();
auto [ x2, y2 ] = f2();
auto& [ xr2, yr2 ] = f2();
const auto [ x3, y3 ] = f3();
}
```
### step to reproduce the error
**For debug version**
> clang++ -c -std=gnu++17 -g test.cpp
**For Release Version**
> clang++ -S -std=gnu++17 -g -emit-llvm -o test.ll
> opt -verify test.ll
```
test.ll:1268:175: error: missing required field 'name'
!140 = distinct !DIGlobalVariable(linkageName: "_ZN5cxx1724test_structured_bindingsDC2x12y1EE", scope: !81, file: !4, line: 742, type: !82, isLocal: false, isDefinition: true)
```
**Note** : the LLVM release version enables option `-disable-llvm-verifier`, thus bypassing the verification of IR. However, the problem still exists.
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