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compiler: warn when using -fincremental with LLVM backend

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This configuration hasn't had much work put into it yet, so is all but
guaranteed to miscompile or crash. Since users are starting to try out
`-fincremental`, and LLVM is still the default backend in many cases,
it's worth having this warning to avoid bug reports like
https://github.com/ziglang/zig/issues/25873.
This commit is contained in:
Matthew Lugg 2025-11-10 12:56:35 +00:00
parent 6d280dc1b0
commit 13993c4f62
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src/main.zig
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@ -3360,6 +3360,10 @@ fn buildOutputType(
fatal("--debug-incremental requires -fincremental", .{});
}
if (incremental and create_module.resolved_options.use_llvm) {
warn("-fincremental is currently unsupported by the LLVM backend; crashes or miscompilations are likely", .{});
}
const cache_mode: Compilation.CacheMode = b: {
// Once incremental compilation is the default, we'll want some smarter logic here,
// considering things like the backend in use and whether there's a ZCU.