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Support calling constexpr functions at compile time (#6878)

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Example:

```carbon
import Cpp inline '''
constexpr int f(int a, int b) { return a + b; }
''';

let a: array(i32, Cpp.f(1, 2)) = (1, 2, 3);
```
This commit is contained in:
Nicholas Bishop
2026-03-12 01:45:31 +00:00
committed by GitHub
parent 5d41529590
commit c1fd771242
11 changed files with 749 additions and 76 deletions
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toolchain/check/testdata/interop/cpp/constexpr.carbon
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+27
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@@ -45,3 +45,30 @@ constexpr float flt = 123.5;
class C(V:! f32) {}
fn F() -> C(Cpp.flt);
let x: C(123.5) = F();
// --- function.carbon
library "[[@TEST_NAME]]";
import Cpp inline '''
constexpr int f(int a, int b) { return a + b; }
''';
let a: array(i32, Cpp.f(1, 2)) = (1, 2, 3);
// --- fail_invalid_constant_eval.carbon
library "[[@TEST_NAME]]";
import Cpp inline '''
constexpr int arr[1] = {0};
constexpr int f(int a) {
return arr[a];
}
''';
// CHECK:STDERR: fail_invalid_constant_eval.carbon:[[@LINE+4]]:19: error: failed to evaluate constexpr function call as a constant [CppConstexprEval]
// CHECK:STDERR: let a: array(i32, Cpp.f(5)) = (1, 2, 3);
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
let a: array(i32, Cpp.f(5)) = (1, 2, 3);