diff options
Diffstat (limited to 'lib/std/debug.zig')
| -rw-r--r-- | lib/std/debug.zig | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/std/debug.zig b/lib/std/debug.zig index 77b619a056..929ab69bf0 100644 --- a/lib/std/debug.zig +++ b/lib/std/debug.zig @@ -183,9 +183,11 @@ pub const sys_can_stack_trace = switch (builtin.cpu.arch) { // `@returnAddress()` in LLVM 10 gives // "Non-Emscripten WebAssembly hasn't implemented __builtin_return_address". + // On Emscripten, Zig only supports `@returnAddress()` in debug builds + // because Emscripten's implementation is very slow. .wasm32, .wasm64, - => native_os == .emscripten, + => native_os == .emscripten and builtin.mode == .Debug, // `@returnAddress()` is unsupported in LLVM 13. .bpfel, |