Re: [PATCH] kbuild: Fix 'no symbols' warning when CONFIG_TRIM_UNUSD_KSYMS=y
From: Nathan Chancellor <nathan@kernel.org>
Date: 2021-08-15 01:15:37
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On 8/14/2021 4:41 PM, Masahiro Yamada wrote:
When CONFIG_TRIM_UNUSED_KSYMS is enabled, I see some warnings like this:
nm: arch/x86/entry/vdso/vdso32/note.o: no symbols
$NM (both GNU nm and llvm-nm) warns when no symbol is found in the
object. Suppress the stderr.
Fixes: bbda5ec671d3 ("kbuild: simplify dependency generation for CONFIG_TRIM_UNUSED_KSYMS")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>Reviewed-by: Nathan Chancellor <nathan@kernel.org>
quoted hunk ↗ jump to hunk
--- scripts/gen_ksymdeps.sh | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)diff --git a/scripts/gen_ksymdeps.sh b/scripts/gen_ksymdeps.sh index 1324986e1362..5493124e8ee6 100755 --- a/scripts/gen_ksymdeps.sh +++ b/scripts/gen_ksymdeps.sh@@ -4,7 +4,10 @@ set -e # List of exported symbols -ksyms=$($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