[PATCH 09/33] rust: kbuild: make `--remap-path-prefix` workaround conditional

[Miguel Ojeda]

The Internal Compiler Error that the comment mentions [1] was fixed in
Rust 1.87.0 [2]. And, for other workarounds, we plan on limiting where
we apply them [3].

Thus limit the ICE one too.

This will help to make sure the workaround is not needed anymore on
newer versions.

Link: https://github.com/rust-lang/rust/issues/138520 [1]
Link: https://github.com/rust-lang/rust/pull/138556 [2]
Link: https://lore.kernel.org/rust-for-linux/20260205131815.2943152-2-mlksvender@xxxxxxxxx/ [3]
Signed-off-by: Miguel Ojeda <ojeda@xxxxxxxxxx>
---
 rust/Makefile | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/rust/Makefile b/rust/Makefile
index 708530ee3613..163d2258e93f 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -145,10 +145,12 @@ doctests_modifiers_workaround := $(rustdoc_modifiers_workaround)$(if $(call rust
 # `rustdoc` ICEs on out-of-tree builds in Rust < 1.87.0
 # (https://github.com/rust-lang/rust/issues/138520). Thus workaround the
 # issue skipping the flag.
+rustdoc_remap_workaround := $(if $(call rustc-min-version,108700),,--remap-path-prefix=%)
+
 quiet_cmd_rustdoc = RUSTDOC $(if $(rustdoc_host),H, ) $<
       cmd_rustdoc = \
 	OBJTREE=$(abspath $(objtree)) \
-	$(RUSTDOC) $(filter-out $(skip_flags) --remap-path-prefix=%,$(if $(rustdoc_host),$(rust_common_flags),$(rust_flags))) \
+	$(RUSTDOC) $(filter-out $(skip_flags) $(rustdoc_remap_workaround),$(if $(rustdoc_host),$(rust_common_flags),$(rust_flags))) \
 		$(rustc_target_flags) -L$(objtree)/$(obj) \
 		-Zunstable-options --generate-link-to-definition \
 		--output $(rustdoc_output) \
-- 
2.53.0