From: Masahiro Yamada <masahiroy@kernel.org>
To: linux-kbuild@vger.kernel.org
Cc: linux-kernel@vger.kernel.org,
Masahiro Yamada <masahiroy@kernel.org>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Nicolas Pitre <nico@fluxnic.net>,
clang-built-linux@googlegroups.com
Subject: [PATCH] kbuild: Fix 'no symbols' warning when CONFIG_TRIM_UNUSD_KSYMS=y
Date: Sun, 15 Aug 2021 08:41:02 +0900 [thread overview]
Message-ID: <20210814234102.2315551-1-masahiroy@kernel.org> (raw)
When CONFIG_TRIM_UNUSED_KSYMS is enabled, I see some warnings like this:
nm: arch/x86/entry/vdso/vdso32/note.o: no symbols
$NM (both GNU nm and llvm-nm) warns when no symbol is found in the
object. Suppress the stderr.
Fixes: bbda5ec671d3 ("kbuild: simplify dependency generation for CONFIG_TRIM_UNUSED_KSYMS")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---
scripts/gen_ksymdeps.sh | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/scripts/gen_ksymdeps.sh b/scripts/gen_ksymdeps.sh
index 1324986e1362..5493124e8ee6 100755
--- a/scripts/gen_ksymdeps.sh
+++ b/scripts/gen_ksymdeps.sh
@@ -4,7 +4,10 @@
set -e
# List of exported symbols
-ksyms=$($NM $1 | sed -n 's/.*__ksym_marker_\(.*\)/\1/p' | tr A-Z a-z)
+#
+# If the object has no symbol, $NM warns 'no symbols'.
+# Suppress the stdout.
+ksyms=$($NM $1 2>/dev/null | sed -n 's/.*__ksym_marker_\(.*\)/\1/p' | tr A-Z a-z)
if [ -z "$ksyms" ]; then
exit 0
--
2.30.2
next reply other threads:[~2021-08-14 23:41 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-14 23:41 Masahiro Yamada [this message]
2021-08-15 1:15 ` [PATCH] kbuild: Fix 'no symbols' warning when CONFIG_TRIM_UNUSD_KSYMS=y Nathan Chancellor
2021-08-15 3:18 ` Fāng-ruì Sòng
2021-08-18 4:28 ` Masahiro Yamada
2021-08-15 3:37 ` Nicolas Pitre
2021-08-18 4:28 ` Masahiro Yamada
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