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From 513a75c02573680e6594bd328f698e2460db1a76 Mon Sep 17 00:00:00 2001
From: Vagrant Cascadian <vagrant@reproducible-builds.org>
Date: Tue, 16 Aug 2022 19:00:04 -0700
Subject: [PATCH] Makefile: Use relative paths for debugging symbols.
The KBUILD_CFLAGS and KBUILD_AFLAGS variables are adjusted to use
-ffile-prefix-map and --debug-prefix-map, respectively, to use
relative paths for occurrences of __FILE__ and debug paths.
This enables reproducible builds regardless of the absolute path to
the build directory:
https://reproducible-builds.org/docs/build-path/
Series-to: u-boot
Signed-off-by: Vagrant Cascadian <vagrant@reproducible-builds.org>
---
Makefile | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
Index: u-boot/Makefile
===================================================================
--- u-boot.orig/Makefile
+++ u-boot/Makefile
@@ -758,14 +758,18 @@ KBUILD_CFLAGS += $(call cc-disable-warni
# Enabled with W=2, disabled by default as noisy
KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
-# change __FILE__ to the relative path from the srctree
-KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
+# change __FILE__ and debugging symbols to the relative path from the
+# srctree
+KBUILD_CFLAGS += $(call cc-option,-ffile-prefix-map=$(srctree)/=)
KBUILD_CFLAGS += -gdwarf-4
# $(KBUILD_AFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
# option to the assembler.
KBUILD_AFLAGS += -gdwarf-4
+# Use relative paths in debugging symbols
+KBUILD_AFLAGS += --debug-prefix-map=$(srctree)/=
+
# Report stack usage if supported
# ARC tools based on GCC 7.1 has an issue with stack usage
# with naked functions, see commit message for more details
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