| Issue |
79734
|
| Summary |
Clang Issues Deprecation Warning on System Headers with Small C++ Modules Project
|
| Labels |
|
| Assignees |
|
| Reporter |
gen740
|
## Step to reproduce
- Create the following two `.ccm` files.
```cpp
// std_module.ccm
module;
#include<vector>
export module std_modules;
export namespace std {
using std::vector;
};
// A.ccm
export module A;
import std_modules;
auto test() {
std::vector<int>().push_back(42);
}
```
- Compile with the following commands.
```
$CXX -std=c++20 -stdlib=libc++ -Wdeprecated-declarations -c std_modules.ccm -fmodule-output=std_modules.pcm
$CXX -std=c++20 -stdlib=libc++ -Wdeprecated-declarations -c A.ccm -fmodule-output=A.pcm -fmodule-file=std_modules=std_modules.pcm
```
## Output
```
In module 'std_modules' imported from A.ccm:3:
/usr/lib/llvm-18/bin/../include/c++/v1/__iterator/reverse_iterator.h:53:14: warning: 'iterator<std::random_access_iterator_tag, int>' is deprecated [-Wdeprecated-declarations]
53 | : public iterator<typename iterator_traits<_Iter>::iterator_category,
| ^
/usr/lib/llvm-18/bin/../include/c++/v1/vector:991:33: note: in instantiation of template class 'std::reverse_iterator<int *>' requested here
991 | __alloc(), _RevIter(__end_), _RevIter(__begin_), _RevIter(__v.__begin_))
| ^
/usr/lib/llvm-18/bin/../include/c++/v1/vector:1455:3: note: in instantiation of member function 'std::__1::vector<int>::__swap_out_circular_buffer' requested here
1455 | __swap_out_circular_buffer(__v);
| ^
/usr/lib/llvm-18/bin/../include/c++/v1/vector:1479:13: note: in instantiation of function template specialization 'std::__1::vector<int>::__push_back_slow_path<int>' requested here
1479 | __end = __push_back_slow_path(std::move(__x));
| ^
A.ccm:6:23: note: in instantiation of member function 'std::__1::vector<int>::push_back' requested here
6 | std::vector<int>().push_back(32);
| ^
/usr/lib/llvm-18/bin/../include/c++/v1/__iterator/iterator.h:23:29: note: 'iterator<std::random_access_iterator_tag, int>' has been explicitly marked deprecated here
23 | struct _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 iterator {
| ^
/usr/lib/llvm-18/bin/../include/c++/v1/__config:1006:41: note: expanded from macro '_LIBCPP_DEPRECATED_IN_CXX17'
1006 | # define _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_DEPRECATED
| ^
/usr/lib/llvm-18/bin/../include/c++/v1/__config:979:49: note: expanded from macro '_LIBCPP_DEPRECATED'
979 | # define _LIBCPP_DEPRECATED __attribute__((__deprecated__))
| ^
1 warning generated.
```
## Environment
- ubuntu 22.04 (docker)
- clang (Installed from https://apt.llvm.org)
```
Ubuntu clang version 18.1.0 (++20240127043115+ed48280f8e9d-1~exp1~20240127043233.6)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
```
## Additional context
I could reproduce this warning on Compile Explorer (https://godbolt.org/z/157e981MY).
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