toolchain/52233: Static binaries are exceptionally massive

[coypu%sdf.org@localhost]

>Number:         52233
>Category:       toolchain
>Synopsis:       Static binaries are exceptionally massive
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun May 14 15:05:00 +0000 2017
>Originator:     coypu
>Release:        NetBSD 7.99.71
>Organization:
>Environment:
NetBSD loggy 7.99.71 NetBSD 7.99.71 (SAFE) #0: Sat May 13 15:28:53 IDT 2017  fly@loggy:/usr/src/sys/arch/amd64/compile/SAFE amd64

>Description:
% cat test.c
void main() {;}
% gcc -static -o static test.c
% ls -lh static
-rwxr-xr-x  1 fly  users  228K May 14 17:35 static
>How-To-Repeat:

>Fix:
highlights from digging:
- nm says lots of citrus, string stuff, what's pulling it in?

- objdump says I have a huge function called _lwp_setprivate - but that's just a short syscall. gdb seems to find the correct definition.

- xxd finds a lot of dead space containing:
0002e550: 0800 0000 0800 0000 0800 0000 0800 0000  ................
0002e560: 1b00 0000 0100 0000 0000 0000 002a 2a2a  .............***
0002e570: 204e 6f20 4c61 6265 6c20 5072 6f76 6964   No Label Provid
0002e580: 6564 202a 2a2a 0000 f1cf 0200 0000 0000  ed ***..........
0002e590: 0000 0000 0000 0000 0800 0000 0800 0000  ................
0002e5a0: 0c00 0000 0c00 0000 1b00 0000 0100 0000  ................
0002e5b0: 0000 0000 0000 0000 002a 2a2a 204e 6f20  .........*** No 
0002e5c0: 4c61 6265 6c20 5072 6f76 6964 6564 202a  Label Provided *
0002e5d0: 2a2a 0000 f1cf 0200 0000 0000 0000 0000  **..............
0002e5e0: 0000 0000 0800 0000 0e00 0000 1400 0000  ................
0002e5f0: 1400 0000 1b00 0000 0100 0000 0000 0000  ................
and so on...
this remains even after calling strip.