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Message-ID: <CAK1hOcPcchkdKyyqNG6o8dhaP_8La7q1LP2rvaxVO8oL81=RuQ@mail.gmail.com>
Date: Wed, 28 Oct 2015 11:05:56 +0100
From: Denys Vlasenko <vda.linux@...glemail.com>
To: musl <musl@...ts.openwall.com>, Rich Felker <dalias@...c.org>
Subject: Re: [PATCH] configure: add gcc flags for better link-time optimization
On Wed, Oct 28, 2015 at 10:53 AM, Denys Vlasenko
<vda.linux@...glemail.com> wrote:
>> Did you see any symbols disappear when adding --gc-sections?
>
> Yes, I do.
>
> $ nm --size-sort busybox_unstripped >busybox_unstripped.nm
> $ nm --size-sort busybox_unstripped--gc-sections
>>busybox_unstripped--gc-sections.nm
> $ diff -u busybox_unstripped.nm busybox_unstripped--gc-sections.nm |
> grep '^[^ @]'
>
> --- busybox_unstripped.nm 2015-10-28 10:48:16.362304813 +0100
> +++ busybox_unstripped--gc-sections.nm 2015-10-28 10:48:26.056294599 +0100
> -0000000000000001 t reinit_unicode_for_ash
> -0000000000000001 t reinit_unicode_for_hush
> -0000000000000007 T xmalloc_sockaddr2host
> -0000000000000008 b cur.1926
> -0000000000000008 b dummy
> -0000000000000008 b dummy_file
> -0000000000000008 b end.1927
> -0000000000000008 b lock.1928
> -0000000000000008 T xstrtoi_range
> -0000000000000008 T xstrtoll_range
> -000000000000000a T bb_internal_getpwnam_r
> -000000000000000a T ipneigh_main
> -000000000000000c T xsocket_stream
> -000000000000000e T xgid2group
> -0000000000000010 T selinux_or_die
> -0000000000000011 T xatoi_range_sfx
> -0000000000000011 T xatou_range_sfx
> -0000000000000012 T xstrtoi
> -0000000000000013 T xatoll_range_sfx
> -0000000000000015 T replace
> -0000000000000017 T xatoi_sfx
> -0000000000000017 T xspawn
> -0000000000000018 T replace_underscores
> -000000000000001a T bb_iswspace
> -000000000000001b T bb_internal_setpwent
> -000000000000001b T xgetgrgid
> -000000000000001c T llist_rev
> -000000000000001c T xstrtoll
> -000000000000001d T xread_char
> -000000000000001e T monotonic_ns
> -0000000000000021 T xatoll_sfx
> -0000000000000021 T xmalloc_fgetline_str
> -0000000000000022 T bb_iswpunct
> -0000000000000023 T bb_iswalnum
> -000000000000002f T bb_internal_endpwent
> -000000000000002f T isrv_want_wr
> -0000000000000033 T bb_delete_module
> -000000000000003c T index_in_str_array
> -000000000000003e T rewind
> -0000000000000043 T is_suffixed_with
> -000000000000004b T moderror
> -0000000000000054 T executable_exists
> -000000000000005a T rta_addattr_l
> -0000000000000062 T string_to_llist
> -0000000000000088 T bb_init_module
> -00000000000000ae T bb_herror_msg
> -00000000000000c3 T parse_cmdline_module_options
> -000000000000010d T __simple_malloc
This was with Rob's preconpiled system-image-x86_64.
Now with musl built with -ffunction-sections -fdata-sections:
--- busybox_unstripped.nm 2015-10-28 11:02:13.047555187 +0100
+++ busybox_unstripped--gc-sections.nm 2015-10-28 11:02:04.290531243 +0100
-0000000000000001 T __cxa_finalize
-0000000000000001 t dummy
-0000000000000001 t dummy
-0000000000000001 t dummy
-0000000000000001 t dummy
-0000000000000001 t reinit_unicode_for_ash
-0000000000000001 t reinit_unicode_for_hush
-0000000000000003 t dummy
-0000000000000004 T ether_line
-0000000000000004 T ether_ntohost
-0000000000000005 T fseek
-0000000000000005 T ftell
-0000000000000005 T __isalnum_l
-0000000000000005 W isalnum_l
-0000000000000005 T __iswalnum_l
-0000000000000005 W iswalnum_l
-0000000000000005 T __iswalpha_l
-0000000000000005 W iswalpha_l
-0000000000000005 T __iswblank_l
-0000000000000005 W iswblank_l
-0000000000000005 T __iswcntrl_l
-0000000000000005 W iswcntrl_l
-0000000000000005 T __iswctype_l
-0000000000000005 W iswctype_l
-0000000000000005 T __iswgraph_l
-0000000000000005 W iswgraph_l
-0000000000000005 T __iswlower_l
-0000000000000005 W iswlower_l
-0000000000000005 T __iswprint_l
-0000000000000005 W iswprint_l
-0000000000000005 T __iswpunct_l
-0000000000000005 W iswpunct_l
-0000000000000005 T __iswspace_l
-0000000000000005 W iswspace_l
-0000000000000005 T __iswupper_l
-0000000000000005 W iswupper_l
-0000000000000005 T __iswxdigit_l
-0000000000000005 W iswxdigit_l
-0000000000000005 T strtoimax
-0000000000000005 W __strtoimax_internal
-0000000000000005 T strtoumax
-0000000000000005 W __strtoumax_internal
-0000000000000005 T __toread_needs_stdio_exit
-0000000000000005 T __towlower_l
-0000000000000005 W towlower_l
-0000000000000005 T __towrite_needs_stdio_exit
-0000000000000005 T __towupper_l
-0000000000000005 W towupper_l
-0000000000000005 T __wctype_l
-0000000000000005 W wctype_l
-0000000000000006 b a.2175
-0000000000000007 T xmalloc_sockaddr2host
-0000000000000008 b cur.1926
-0000000000000008 b dummy
-0000000000000008 b dummy_file
-0000000000000008 b end.1927
-0000000000000008 b lock.1928
-0000000000000008 D __stderr_used
-0000000000000008 T xstrtoi_range
-0000000000000008 T xstrtoll_range
-000000000000000a T bb_internal_getpwnam_r
-000000000000000a T ether_aton
-000000000000000a T ipneigh_main
-000000000000000a T strtold
-000000000000000a W __strtold_l
-000000000000000a W strtold_l
-000000000000000c T xsocket_stream
-000000000000000e T posix_openpt
-000000000000000e T xgid2group
-0000000000000010 T selinux_or_die
-0000000000000011 T __tolower_l
-0000000000000011 W tolower_l
-0000000000000011 T xatoi_range_sfx
-0000000000000011 T xatou_range_sfx
-0000000000000012 T __isblank_l
-0000000000000012 W isblank_l
-0000000000000012 T xstrtoi
-0000000000000013 T xatoll_range_sfx
-0000000000000015 T replace
-0000000000000017 T umount
-0000000000000017 T xatoi_sfx
-0000000000000017 T xspawn
-0000000000000018 T replace_underscores
-000000000000001a T bb_iswspace
-000000000000001b T bb_internal_setpwent
-000000000000001b T xgetgrgid
-000000000000001c T llist_rev
-000000000000001c T xstrtoll
-000000000000001d T xread_char
-000000000000001e T monotonic_ns
-0000000000000021 T xatoll_sfx
-0000000000000021 T xmalloc_fgetline_str
-0000000000000022 T bb_iswpunct
-0000000000000022 T endusershell
-0000000000000022 T strtof
-0000000000000022 W __strtof_l
-0000000000000022 W strtof_l
-0000000000000023 T bb_iswalnum
-000000000000002f T bb_internal_endpwent
-000000000000002f T __do_orphaned_stdio_locks
-000000000000002f T isrv_want_wr
-0000000000000033 T bb_delete_module
-0000000000000034 T fstatvfs
-0000000000000034 W fstatvfs64
-0000000000000034 T statvfs
-0000000000000034 W statvfs64
-0000000000000035 T setlogmask
-000000000000003c T index_in_str_array
-000000000000003e T rewind
-0000000000000043 T is_suffixed_with
-000000000000004b T moderror
-000000000000004f W fstatfs
-000000000000004f T __fstatfs
-000000000000004f W fstatfs64
-0000000000000054 T addmntent
-0000000000000054 T executable_exists
-000000000000005a T rta_addattr_l
-000000000000005b T __timedwait
-0000000000000062 T string_to_llist
-0000000000000070 T __strcasecmp_l
-0000000000000070 W strcasecmp_l
-0000000000000088 T bb_init_module
-000000000000008b T __strncasecmp_l
-000000000000008b W strncasecmp_l
-000000000000009c t fixup
-00000000000000ae T bb_herror_msg
-00000000000000c3 T parse_cmdline_module_options
-000000000000010c T __simple_malloc
Because now objects live in separate sections each,
ld can drop more of them.
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