linux-kernel - [PATCH AUTOSEL 6.14 1/3] kbuild, rust: use -fremap-path-prefix to make paths relative

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Message-Id: <20250408005335.3334585-1-sashal@kernel.org>
Date: Mon,  7 Apr 2025 20:53:33 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Thomas Weißschuh <linux@...ssschuh.net>,
	Miguel Ojeda <ojeda@...nel.org>,
	Gary Guo <gary@...yguo.net>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	alex.gaynor@...il.com,
	linux-kbuild@...r.kernel.org,
	rust-for-linux@...r.kernel.org
Subject: [PATCH AUTOSEL 6.14 1/3] kbuild, rust: use -fremap-path-prefix to make paths relative

From: Thomas Weißschuh <linux@...ssschuh.net>

[ Upstream commit dbdffaf50ff9cee3259a7cef8a7bd9e0f0ba9f13 ]

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 1d3730f0012f ("kbuild: support -fmacro-prefix-map for external
modules") and commit a73619a845d5 ("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@...nel.org>
Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
Tested-by: Gary Guo <gary@...yguo.net>
Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Makefile b/Makefile
index 8b6764d44a610..c4eeb97ab3df2 100644
--- a/Makefile
+++ b/Makefile
@@ -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
-- 
2.39.5