libc reduction
Is here somebody around who groks library reduction? I'm not getting
anywhere with it, lacking some background information and seem to be
blind all over.
The problem:
__udivdi3 is in the reduced libc, while __divdi3 is not.
This causes mke2fs to fail on plain files.
Some output (which I don't fully understand due to the lack of objdump
documentation)
/mnt is root1440.bin
finlandia!joey(tty5):/home/project/Debian/CVS/boot-floppies> objdump --dynamic-syms /mnt/lib/libc-2.1.3.so |grep divdi
00062330 g DF .text 0000011a GLIBC_2.0 __udivdi3
finlandia!joey(tty5):/home/project/Debian/CVS/boot-floppies> objdump --dynamic-syms /lib/libc-2.1.3.so |grep divdi
000c7230 g DF .text 0000019f GLIBC_2.0 __divdi3
000c7600 g DF .text 0000011f GLIBC_2.0 __udivdi3
finlandia!joey(tty5):/home/project/Debian/CVS/boot-floppies> objdump --syms /usr/lib/libc_pic.a |grep divdi
objdump: bsd-setjmp.os: no symbols
objdump: bsd-_setjmp.os: no symbols
00000000 *UND* 00000000 __divdi3
00000000 *UND* 00000000 __udivdi3
00000000 *UND* 00000000 __udivdi3
00000000 *UND* 00000000 __udivdi3
00000000 *UND* 00000000 __udivdi3
00000000 *UND* 00000000 __udivdi3
00000000 *UND* 00000000 __udivdi3
00000000 *UND* 00000000 __udivdi3
00000000 *UND* 00000000 __udivdi3
00000000 *UND* 00000000 __udivdi3
finlandia!joey(tty5):/home/project/Debian/CVS/boot-floppies> objdump --dynamic-syms /mnt/lib/libext2fs.so.2.4 |grep divdi
00000000 DF *UND* 0000019e GLIBC_2.0 __divdi3
finlandia!joey(tty5):/home/project/Debian/CVS/boot-floppies> objdump --dynamic-syms /mnt/sbin/mke2fs |grep divdi
0804b1d0 g DF .text 0000011a Base __udivdi3
finlandia!joey(tty5):/home/project/Debian/CVS/boot-floppies>
I guess that ".text" means the symbol is defined in that file
and that "*UND*" is just a reference to the symbol. If so, the
symbol get's stripped off and I don't know why...
Letting mklibs.sh run on libext2, mke2fs and libc results in
undefined-symbol: __divdi3
undefined-symbol: __udivdi3
but not in provided symbols.
I'm giving up for the moment unless somebody gives me the required
hint.
Regards,
Joey
--
Those who don't understand Unix are condemned to reinvent it, poorly.
Please always Cc to me when replying to me on the lists.
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