| Issue |
169139
|
| Summary |
[clang] Linker regression with lambda NTTP containing `consteval` function call
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
k3DW
|
This following code worked in Clang 20, but no longer works in Clang 21. It also works in MSVC and GCC. I'm wondering whether this is a regression. https://godbolt.org/z/aYTTorW3o
```cpp
consteval int foo() {
return 0;
}
template <auto fn>
void bar() {
fn();
};
int main() {
bar<[] { return foo(); }>();
}
```
The compile step succeeds, but the linking fails.
```none
ASM generation compiler returned: 0
/opt/compiler-explorer/gcc-15.2.0/lib/gcc/x86_64-linux-gnu/15.2.0/../../../../x86_64-linux-gnu/bin/ld: /tmp/example-a45c6a.o: in function `main::$_0::operator()() const':
<source>:9:(.text+0x3d): undefined reference to `foo()'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
Execution build compiler returned: 1
Build failed
```
Note that this code works fine when the lambda is not a temporary. https://godbolt.org/z/6xPPczena
```cpp
// etc
int main() {
constexpr auto x = [] { return foo(); };
bar<x>();
}
```
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