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866ced950b
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Andi Kleen 866ced950b kbuild: Support split debug info v4 
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>
2014-07-30 22:54:52 +02:00
..
fonts
lz4
lzo
mpi
raid6
reed_solomon
xz lib/xz: enable all filters by default in Kconfig 2014-06-04 16:54:18 -07:00
zlib_deflate
zlib_inflate
.gitignore
argv_split.c
asn1_decoder.c lib/asn1_decoder.c: kernel-doc warning fix 2014-06-04 16:54:19 -07:00
assoc_array.c
atomic64_test.c lib/atomic64_test.c: convert printk(KERN_INFO to pr_info 2014-06-04 16:54:19 -07:00
atomic64.c
audit.c
average.c
bcd.c
bch.c
bitmap.c
bitrev.c
bsearch.c
btree.c lib/btree.c: fix leak of whole btree nodes 2014-06-04 16:54:18 -07:00
bug.c lib/bug.c: convert printk to pr_foo() 2014-06-04 16:54:19 -07:00
build_OID_registry
bust_spinlocks.c
check_signature.c
checksum.c
clz_ctz.c lib/clz_ctz.c: add prototype declarations in lib/clz_ctz.c 2014-04-03 16:21:12 -07:00
clz_tab.c
cmdline.c
compat_audit.c
cordic.c
cpu_rmap.c
cpu-notifier-error-inject.c
cpumask.c cpumask: Utility function to set n'th cpu - local cpu first 2014-06-11 14:58:16 -07:00
crc7.c lib/crc7: Shift crc7() output left 1 bit 2014-05-16 14:26:52 -04:00
crc8.c
crc16.c
crc32.c lib/crc32.c: remove unnecessary __constant 2014-06-04 16:54:19 -07:00
crc32defs.h
crc-ccitt.c
crc-itu-t.c
crc-t10dif.c
ctype.c
debug_locks.c
debugobjects.c lib/debugobjects.c: convert printk(KERN_DEBUG to pr_debug 2014-06-04 16:53:53 -07:00
dec_and_lock.c
decompress_bunzip2.c
decompress_inflate.c lib/decompress_inflate.c: include appropriate header file 2014-04-03 16:21:12 -07:00
decompress_unlz4.c
decompress_unlzma.c
decompress_unlzo.c
decompress_unxz.c
decompress.c initramfs: debug detected compression method 2014-04-07 16:36:11 -07:00
devres.c lib/devres.c: fix checkpatch warnings 2014-05-24 07:28:01 +09:00
digsig.c lib/digsig.c: kernel-doc warning fixes 2014-06-04 16:54:19 -07:00
div64.c
dma-debug.c
dump_stack.c asmlinkage: Add explicit __visible to drivers/*, lib/*, kernel/* 2014-05-05 16:07:46 -07:00
dynamic_debug.c
dynamic_queue_limits.c
earlycpio.c
extable.c
fault-inject.c
fdt_empty_tree.c lib: add fdt_empty_tree.c 2014-04-30 19:49:37 +01:00
fdt_ro.c
fdt_rw.c
fdt_strerror.c
fdt_sw.c
fdt_wip.c
fdt.c
find_last_bit.c
find_next_bit.c
flex_array.c
flex_proportions.c
gcd.c
gen_crc32table.c
genalloc.c
halfmd4.c
hash.c
hexdump.c
hweight.c
idr.c idr: reduce the unneeded check in free_layer() 2014-06-06 16:08:12 -07:00
inflate.c
int_sqrt.c
interval_tree_test.c lib: Export interval_tree 2014-05-05 09:09:14 +02:00
interval_tree.c lib: Export interval_tree 2014-05-05 09:09:14 +02:00
iomap_copy.c
iomap.c Kconfig: rename HAS_IOPORT to HAS_IOPORT_MAP 2014-04-07 16:36:11 -07:00
iommu-helper.c
ioremap.c
iovec.c
irq_regs.c
is_single_threaded.c
jedec_ddr_data.c
kasprintf.c
Kconfig lib: Export interval_tree 2014-05-05 09:09:14 +02:00
Kconfig.debug kbuild: Support split debug info v4 2014-07-30 22:54:52 +02:00
Kconfig.kgdb
Kconfig.kmemcheck
kfifo.c
klist.c
kobject_uevent.c kobject: Make support for uevent_helper optional. 2014-04-25 12:00:49 -07:00
kobject.c
kstrtox.c
kstrtox.h
lcm.c
libcrc32c.c lib/libcrc32c.c: use PTR_ERR_OR_ZERO 2014-06-04 16:54:18 -07:00
list_debug.c
list_sort.c
llist.c
locking-selftest-hardirq.h
locking-selftest-mutex.h
locking-selftest-rlock-hardirq.h
locking-selftest-rlock-softirq.h
locking-selftest-rlock.h
locking-selftest-rsem.h
locking-selftest-softirq.h
locking-selftest-spin-hardirq.h
locking-selftest-spin-softirq.h
locking-selftest-spin.h
locking-selftest-wlock-hardirq.h
locking-selftest-wlock-softirq.h
locking-selftest-wlock.h
locking-selftest-wsem.h
locking-selftest.c
lockref.c
lru_cache.c
Makefile Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-06-12 14:27:40 -07:00
md5.c
memory-notifier-error-inject.c
memweight.c
net_utils.c
nlattr.c Merge branch 'next' (accumulated 3.16 merge window patches) into master 2014-06-08 11:31:16 -07:00
notifier-error-inject.c
notifier-error-inject.h
of-reconfig-notifier-error-inject.c
oid_registry.c
parser.c
pci_iomap.c
percpu_counter.c lib/percpu_counter.c: fix bad percpu counter state during suspend 2014-04-08 16:48:51 -07:00
percpu_ida.c
percpu_test.c
percpu-refcount.c
plist.c lib/plist.c: replace pr_debug with printk in plist_test() 2014-06-04 16:54:18 -07:00
pm-notifier-error-inject.c
prio_heap.c
proportions.c
radix-tree.c lib/radix-tree.c: update the kmemleak stack trace for radix tree allocations 2014-06-06 16:08:17 -07:00
random32.c lib/random32.c: minor cleanups and kdoc fix 2014-04-03 16:21:11 -07:00
ratelimit.c
rational.c
rbtree_test.c
rbtree.c
reciprocal_div.c
scatterlist.c
sha1.c
show_mem.c
smp_processor_id.c percpu: add preemption checks to __this_cpu ops 2014-04-07 16:36:14 -07:00
sort.c
stmp_device.c
string_helpers.c
string.c lib/string.c: use the name "C-string" in comments 2014-06-04 16:54:18 -07:00
strncpy_from_user.c
strnlen_user.c
swiotlb.c x86: enable DMA CMA with swiotlb 2014-06-04 16:53:57 -07:00
syscall.c lib/syscall.c: unexport task_current_syscall() 2014-04-03 16:21:06 -07:00
test_bpf.c net: filter: fix nlattr and nlattr_nest BPF tests 2014-06-11 00:13:16 -07:00
test_module.c
test_user_copy.c
test-kstrtox.c
test-string_helpers.c
textsearch.c lib/textsearch.c: move EXPORT_SYMBOL after functions 2014-06-04 16:54:19 -07:00
timerqueue.c
ts_bm.c
ts_fsm.c
ts_kmp.c
ucs2_string.c
usercopy.c
uuid.c
vsprintf.c lib/vsprintf.c: fix comparison to bool 2014-06-04 16:54:18 -07:00