1e4cfe954b
[ Upstream commit 52d83df682c82055961531853c066f4f16e234ea ]
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.
Fangrui Song mentioned binutils>=2.37 `nm -q` can be used to suppress
"no symbols" [1], and llvm-nm>=13.0.0 supports -q as well.
We cannot use it for now, but note it as a TODO.
[1]: https://sourceware.org/bugzilla/show_bug.cgi?id=27408
Fixes: bbda5ec671 ("kbuild: simplify dependency generation for CONFIG_TRIM_UNUSED_KSYMS")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
32 lines
610 B
Bash
Executable File
32 lines
610 B
Bash
Executable File
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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set -e
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# List of exported symbols
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#
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# If the object has no symbol, $NM warns 'no symbols'.
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# Suppress the stderr.
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# TODO:
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# Use -q instead of 2>/dev/null when we upgrade the minimum version of
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# binutils to 2.37, llvm to 13.0.0.
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ksyms=$($NM $1 2>/dev/null | sed -n 's/.*__ksym_marker_\(.*\)/\1/p' | tr A-Z a-z)
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if [ -z "$ksyms" ]; then
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exit 0
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fi
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echo
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echo "ksymdeps_$1 := \\"
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for s in $ksyms
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do
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echo $s | sed -e 's:^_*: $(wildcard include/ksym/:' \
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-e 's:__*:/:g' -e 's/$/.h) \\/'
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done
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echo
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echo "$1: \$(ksymdeps_$1)"
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echo
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echo "\$(ksymdeps_$1):"
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