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kbuild, rust: use -fremap-path-prefix to make paths relative

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Remap source path prefixes in all output, including compiler
diagnostics, debug information, macro expansions, etc.
This removes a few absolute paths from the binary and also makes it
possible to use core::panic::Location properly.

Equivalent to the same configuration done for C sources in
commit 1d3730f001 ("kbuild: support -fmacro-prefix-map for external
modules") and commit a73619a845 ("kbuild: use -fmacro-prefix-map to
make __FILE__ a relative path").

Link: https://doc.rust-lang.org/rustc/command-line-arguments.html#--remap-path-prefix-remap-source-names-in-output
Acked-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Tested-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Thomas Weißschuh 2025-02-19 22:22:13 +01:00 • committed by Masahiro Yamada
parent 268d191abc
commit dbdffaf50f
1 changed files with 1 additions and 0 deletions
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Makefile
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@ -1068,6 +1068,7 @@ endif
# change __FILE__ to the relative path to the source directory
ifdef building_out_of_srctree
KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srcroot)/=)
KBUILD_RUSTFLAGS += --remap-path-prefix=$(srcroot)/=
endif
# include additional Makefiles when needed