Reuse CrateNum for proc-macro crates even when cross-compiling
Proc-macros are always compiled for the host, so this should be the same
in every way as recompiling the crate.
I am not sure why the previous code special-cased the target, since the
compiler properly gives an error when trying to load a crate for a
different host:
```
error[E0461]: couldn't find crate `dependency` with expected target triple x86_64-unknown-linux-gnu
--> /home/joshua/rustc4/src/test/ui/cfg-dependent.rs:8:2
|
LL | dependency::is_64();
| ^^^^^^^^^^
|
= note: the following crate versions were found:
crate `dependency`, target triple i686-unknown-linux-gnu: /home/joshua/rustc4/build/x86_64-unknown-linux-gnu/test/ui/cfg-dependent/auxiliary/libdependency.so
```
I think another possible fix is to remove the check altogether. But I'm
not sure, and this fix works, so I'm not making the larger change here.
Fixes https://github.com/rust-lang/rust/issues/56935.
r? `@petrochenkov` cc `@alexcrichton`
// don't want to match a host crate against an equivalent target one
// already loaded.
let root = library.metadata.get_root();
- Ok(Some(if locator.triple == self.sess.opts.target_triple {
+ // FIXME: why is this condition necessary? It was adding in #33625 but I
+ // don't know why and the original author doesn't remember ...
+ let can_reuse_cratenum =
+ locator.triple == self.sess.opts.target_triple || locator.is_proc_macro == Some(true);
+ Ok(Some(if can_reuse_cratenum {
let mut result = LoadResult::Loaded(library);
self.cstore.iter_crate_data(|cnum, data| {
if data.name() == root.name() && root.hash() == data.hash() {
--- /dev/null
+// force-host
+// no-prefer-dynamic
+#![crate_name = "reproduction"]
+#![crate_type = "proc-macro"]
+
+extern crate proc_macro;
+use proc_macro::TokenStream;
+
+#[proc_macro]
+pub fn mac(input: TokenStream) -> TokenStream {
+ input
+}
--- /dev/null
+// edition:2018
+// compile-flags:--extern reproduction
+// aux-build:proc-macro.rs
+// check-pass
+
+reproduction::mac!();
+
+fn main() {}