linux-kernel - [PATCH 2/4] kbuild: doc: reproducible-builds: drop section "Absolute filenames"

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Message-Id: <20250313-kbuild-prefix-map-v1-2-38cea8448c5f@weissschuh.net>
Date: Thu, 13 Mar 2025 16:59:10 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Masahiro Yamada <masahiroy@...nel.org>, 
 Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, 
 Jonathan Corbet <corbet@....net>, Thomas Gleixner <tglx@...utronix.de>, 
 Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
 Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
 "H. Peter Anvin" <hpa@...or.com>, Ben Hutchings <ben@...adent.org.uk>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-doc@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 2/4] kbuild: doc: reproducible-builds: drop section
 "Absolute filenames"

The top-level Makefile now uses the generic -ffile-prefix-map which also
affects debug information, making the manual override superfluous.

Drop the now unnecessary section.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 Documentation/kbuild/reproducible-builds.rst | 16 ----------------
 1 file changed, 16 deletions(-)

diff --git a/Documentation/kbuild/reproducible-builds.rst b/Documentation/kbuild/reproducible-builds.rst
index f2dcc39044e66ddd165646e0b51ccb0209aca7dd..c815f486926253ffe5daa5e9a9ab3dbcb142c6fc 100644
--- a/Documentation/kbuild/reproducible-builds.rst
+++ b/Documentation/kbuild/reproducible-builds.rst
@@ -46,21 +46,6 @@ The kernel embeds the building user and host names in
 `KBUILD_BUILD_USER and KBUILD_BUILD_HOST`_ variables.  If you are
 building from a git commit, you could use its committer address.

-Absolute filenames
-------------------
-
-When the kernel is built out-of-tree, debug information may include
-absolute filenames for the source files.  This must be overridden by
-including the ``-fdebug-prefix-map`` option in the `KCFLAGS`_ variable.
-
-Depending on the compiler used, the ``__FILE__`` macro may also expand
-to an absolute filename in an out-of-tree build.  Kbuild automatically
-uses the ``-fmacro-prefix-map`` option to prevent this, if it is
-supported.
-
-The Reproducible Builds web site has more information about these
-`prefix-map options`_.
-
 Generated files in source packages
 ----------------------------------

@@ -132,6 +117,5 @@ See ``scripts/setlocalversion`` for details.
 .. _KBUILD_BUILD_TIMESTAMP: kbuild.html#kbuild-build-timestamp
 .. _KBUILD_BUILD_USER and KBUILD_BUILD_HOST: kbuild.html#kbuild-build-user-kbuild-build-host
 .. _KCFLAGS: kbuild.html#kcflags
-.. _prefix-map options: https://reproducible-builds.org/docs/build-path/
 .. _Reproducible Builds project: https://reproducible-builds.org/
 .. _SOURCE_DATE_EPOCH: https://reproducible-builds.org/docs/source-date-epoch/

-- 
2.48.1