[PATCH] use per function sections + --gc-sections: saves ~5k

[Denis Vlasenko]

Hi,

This patch passes -ffunction-sections -fdata-sections to gcc
and --gc-sections to ld. Result:

# size busybox.org.tst/busybox busybox.sections.tst/busybox
   text    data     bss     dec     hex filename
 920143   12268 1047076 1979487  1e345f busybox.org.tst/busybox
 915759   10616 1045572 1971947  1e16eb busybox.sections.tst/busybox

"make sizes" diff:
        ...
        @@ -3445,7 +3371,6 @@
         00000102 t getcell
         00000102 t process_inodes
         00000103 T cp_main
        -00000103 T rtnl_from_file
         00000104 T ar_main
         00000104 T cpio_main
         00000104 T env_main
        @@ -3591,7 +3516,6 @@
         0000015c t subevalvar
         00000160 t fill_package_struct
         00000160 T rtnl_rtntype_a2n
        -00000163 T rtnl_listen
         00000166 t remove_package
         00000167 t check_dep
         00000168 t parse_stream_outer
        @@ -3884,9 +3808,7 @@
         00000400 b root_block
         00000400 d rtnl_rtdsfield_tab
         00000400 d rtnl_rtprot_tab
        -00000400 d rtnl_rtrealm_tab
         00000400 d rtnl_rtscope_tab
        -00000400 d rtnl_rttable_tab
         00000400 b super_block_buffer
         00000400 b super_block_buffer
         00000401 b line.1

Also available at http://195.66.192.167/linux/bbox/sections.patch
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vda
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