866ced950b
This is an alternative approach to lower the overhead of debug info (as we discussed a few days ago) gcc 4.7+ and newer binutils have a new "split debug info" debug info model where the debug info is only written once into central ".dwo" files. This avoids having to copy it around multiple times, from the object files to the final executable. It lowers the disk space requirements. In addition it defaults to compressed debug data. More details here: http://gcc.gnu.org/wiki/DebugFission This patch adds a new option to enable it. It has to be an option, because it'll undoubtedly break everyone's debuginfo packaging scheme. gdb/objdump/etc. all still work, if you have new enough versions. I don't see big compile wins (maybe a second or two faster or so), but the object dirs with debuginfo get significantly smaller. My standard kernel config (slightly bigger than defconfig) shrinks from 2.9G disk space to 1.1G objdir (with non reduced debuginfo). I presume if you are IO limited the compile time difference will be larger. Only problem I've seen so far is that it doesn't play well with older versions of ccache (apparently fixed, see https://bugzilla.samba.org/show_bug.cgi?id=10005) v2: various fixes from Dirk Gouders. Improve commit message slightly. v3: Fix clean rules and improve Kconfig slightly v4: Fix merge error in last version (Sam Ravnborg) Clarify description that it mainly helps disk size. Cc: Dirk Gouders <dirk@gouders.net> Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Michal Marek <mmarek@suse.cz>
98 lines
1.1 KiB
Text
98 lines
1.1 KiB
Text
#
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# NOTE! Don't add files that are generated in specific
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# subdirectories here. Add them in the ".gitignore" file
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# in that subdirectory instead.
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#
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# NOTE! Please use 'git ls-files -i --exclude-standard'
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# command after changing this file, to see if there are
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# any tracked files which get ignored after the change.
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#
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# Normal rules
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#
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.*
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*.o
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*.o.*
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*.a
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*.s
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*.ko
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*.so
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*.so.dbg
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*.mod.c
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*.i
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*.lst
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*.symtypes
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*.order
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*.elf
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*.bin
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*.gz
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*.bz2
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*.lzma
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*.xz
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*.lz4
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*.lzo
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*.patch
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*.gcno
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modules.builtin
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Module.symvers
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*.dwo
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#
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# Top-level generic files
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#
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/tags
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/TAGS
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/linux
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/vmlinux
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/vmlinuz
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/System.map
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/Module.markers
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#
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# Debian directory (make deb-pkg)
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#
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/debian/
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#
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# git files that we don't want to ignore even it they are dot-files
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#
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!.gitignore
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!.mailmap
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#
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# Generated include files
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#
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include/config
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include/generated
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arch/*/include/generated
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# stgit generated dirs
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patches-*
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# quilt's files
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patches
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series
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# cscope files
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cscope.*
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ncscope.*
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# gnu global files
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GPATH
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GRTAGS
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GSYMS
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GTAGS
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*.orig
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*~
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\#*#
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#
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# Leavings from module signing
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#
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extra_certificates
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signing_key.priv
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signing_key.x509
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x509.genkey
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# Kconfig presets
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all.config
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