identifier z crashes LLVM

[bottle2]

check out this error report: emscripten-core/emscripten#23383
maybe you have a regression? emcc says to be using clang version 20.0.0git, but I'm using clang 19.1.6 and no such problem exists.

$ clang -v
clang version 19.1.6
Target: x86_64-w64-windows-gnu
Thread model: posix
InstalledDir: C:/msys64/clang64/bin

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: None (bottle2)

check out this error report: https://github.com/emscripten-core/emscripten/issues/23383 maybe you have a regression? emcc says to be using clang version 20.0.0git, but I'm using clang 19.1.6 and no such problem exists.

$ clang -v
clang version 19.1.6
Target: x86_64-w64-windows-gnu
Thread model: posix
InstalledDir: C:/msys64/clang64/bin

[shafik]

We are going to need some sort of reduction to make any progress, I don't see any similar bugs so far.

[bottle2]

is "reduction" finding which commit introduced the bug?

[Endilll]

We need a self-contained reproducer, which means it doesn't depend on any other files (think Compiler Explorer examples). That file is likely to be at least several megabytes in size, and reducing it to something that fits on the screen is the reduction Shafik meant.

[bottle2]

ah, okay.

this the first test case:

int z;

this is the second test case:

int z = 2;

this is the third test case:

int z(int);

[Endilll]

Neither of them reproduce on their own: https://godbolt.org/z/83o6n1KGf
Additional information needed.