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From b71272e6ef894b1fab04efa2ba98e32d00829eb0 Mon Sep 17 00:00:00 2001
From: Sami Tolvanen <samitolvanen@google.com>
Date: Wed, 5 Feb 2020 06:09:07 -0800
Subject: [PATCH 10/24] kbuild: lto: remove duplicate dependencies from .mod
files
With LTO, llvm-nm prints out symbols for each archive member
separately, which results in a lot of duplicate dependencies in the
.mod file when CONFIG_TRIM_UNUSED_SYMS is enabled. When a module
consists of several compilation units, the output can exceed the
default xargs command size limit and split the dependency list to
multiple lines, which results in used symbols getting trimmed.
This change removes duplicate dependencies, which will reduce the
probability of this happening and makes .mod files smaller and
easier to read.
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
---
scripts/Makefile.build | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 82977350f5a6..82b465ce3ca0 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -291,7 +291,7 @@ endef
# List module undefined symbols (or empty line if not enabled)
ifdef CONFIG_TRIM_UNUSED_KSYMS
-cmd_undef_syms = $(NM) $< | sed -n 's/^ *U //p' | xargs echo
+cmd_undef_syms = $(NM) $< | sed -n 's/^ *U //p' | sort -u | xargs echo
else
cmd_undef_syms = echo
endif
--
2.28.0
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