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9f8fe64779
Make DEBUG_INFO_COMPRESSED a choice; DEBUG_INFO_COMPRESSED_NONE is the default, DEBUG_INFO_COMPRESSED_ZLIB uses zlib, DEBUG_INFO_COMPRESSED_ZSTD uses zstd. This renames the existing KConfig option DEBUG_INFO_COMPRESSED to DEBUG_INFO_COMPRESSED_ZLIB so users upgrading may need to reset the new Kconfigs. Some quick N=1 measurements with du, /usr/bin/time -v, and bloaty: clang-16, x86_64 defconfig plus CONFIG_DEBUG_INFO=y CONFIG_DEBUG_INFO_COMPRESSED_NONE=y: Elapsed (wall clock) time (h:mm:ss or m:ss): 0:55.43 488M vmlinux 27.6% 136Mi 0.0% 0 .debug_info 6.1% 30.2Mi 0.0% 0 .debug_str_offsets 3.5% 17.2Mi 0.0% 0 .debug_line 3.3% 16.3Mi 0.0% 0 .debug_loclists 0.9% 4.62Mi 0.0% 0 .debug_str clang-16, x86_64 defconfig plus CONFIG_DEBUG_INFO=y CONFIG_DEBUG_INFO_COMPRESSED_ZLIB=y: Elapsed (wall clock) time (h:mm:ss or m:ss): 1:00.35 385M vmlinux 21.8% 85.4Mi 0.0% 0 .debug_info 2.1% 8.26Mi 0.0% 0 .debug_str_offsets 2.1% 8.24Mi 0.0% 0 .debug_loclists 1.9% 7.48Mi 0.0% 0 .debug_line 0.5% 1.94Mi 0.0% 0 .debug_str clang-16, x86_64 defconfig plus CONFIG_DEBUG_INFO=y CONFIG_DEBUG_INFO_COMPRESSED_ZSTD=y: Elapsed (wall clock) time (h:mm:ss or m:ss): 0:59.69 373M vmlinux 21.4% 81.4Mi 0.0% 0 .debug_info 2.3% 8.85Mi 0.0% 0 .debug_loclists 1.5% 5.71Mi 0.0% 0 .debug_line 0.5% 1.95Mi 0.0% 0 .debug_str_offsets 0.4% 1.62Mi 0.0% 0 .debug_str That's only a 3.11% overall binary size savings over zlib, but at no performance regression. Link: https://maskray.me/blog/2022-09-09-zstd-compressed-debug-sections Link: https://maskray.me/blog/2022-01-23-compressed-debug-sections Suggested-by: Sedat Dilek (DHL Supply Chain) <sedat.dilek@dhl.com> Reviewed-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
45 lines
1.1 KiB
Makefile
45 lines
1.1 KiB
Makefile
DEBUG_CFLAGS :=
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DEBUG_RUSTFLAGS :=
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debug-flags-y := -g
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ifdef CONFIG_DEBUG_INFO_SPLIT
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DEBUG_CFLAGS += -gsplit-dwarf
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endif
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debug-flags-$(CONFIG_DEBUG_INFO_DWARF4) += -gdwarf-4
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debug-flags-$(CONFIG_DEBUG_INFO_DWARF5) += -gdwarf-5
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ifeq ($(CONFIG_CC_IS_CLANG)$(CONFIG_AS_IS_GNU),yy)
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# Clang does not pass -g or -gdwarf-* option down to GAS.
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# Add -Wa, prefix to explicitly specify the flags.
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KBUILD_AFLAGS += $(addprefix -Wa$(comma), $(debug-flags-y))
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endif
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DEBUG_CFLAGS += $(debug-flags-y)
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KBUILD_AFLAGS += $(debug-flags-y)
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ifdef CONFIG_DEBUG_INFO_REDUCED
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DEBUG_CFLAGS += -fno-var-tracking
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DEBUG_RUSTFLAGS += -Cdebuginfo=1
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ifdef CONFIG_CC_IS_GCC
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DEBUG_CFLAGS += -femit-struct-debug-baseonly
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endif
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else
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DEBUG_RUSTFLAGS += -Cdebuginfo=2
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endif
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ifdef CONFIG_DEBUG_INFO_COMPRESSED_ZLIB
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DEBUG_CFLAGS += -gz=zlib
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KBUILD_AFLAGS += -gz=zlib
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KBUILD_LDFLAGS += --compress-debug-sections=zlib
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else ifdef CONFIG_DEBUG_INFO_COMPRESSED_ZSTD
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DEBUG_CFLAGS += -gz=zstd
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KBUILD_AFLAGS += -gz=zstd
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KBUILD_LDFLAGS += --compress-debug-sections=zstd
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endif
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KBUILD_CFLAGS += $(DEBUG_CFLAGS)
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export DEBUG_CFLAGS
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KBUILD_RUSTFLAGS += $(DEBUG_RUSTFLAGS)
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export DEBUG_RUSTFLAGS
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