| Issue |
203372
|
| Summary |
[clang++] deprecation warnings for unused constexpr branch
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
laverdet
|
I was hoping to move away from preprocessor macros because they make my life more complicated with modules. It seems to be a nonstarter if I want my project to compile against multiple versions of the same external library which goes through a lot of churn.
```
$ cat a.cc
[[deprecated]] auto foo() -> void;
auto foo(int) -> void;
auto main() -> int {
constexpr auto new_foo = true;
if constexpr (new_foo) {
foo(1);
} else {
foo();
}
return 0;
}
```
```
$ clang++ a.cc -c
a.cc:9:3: warning: 'foo' is deprecated [-Wdeprecated-declarations]
9 | foo();
| ^
a.cc:1:3: note: 'foo' has been explicitly marked deprecated here
1 | [[deprecated]] auto foo() -> void;
| ^
1 warning generated.
```
```
$ clang++ --version
Homebrew clang version 22.1.7
Target: arm64-apple-darwin24.6.0
Thread model: posix
InstalledDir: /opt/homebrew/Cellar/llvm/22.1.7/bin
Configuration file: /Users/marcel/.config/clang/arm64-apple-darwin24.cfg
```
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