Date: Fri, 03 Jul 2009 17:05:08 +0200 From: Dimitry Andric <dimitry@andric.com> To: "Patrick M. Hausen" <hausen@punkt.de> Cc: FreeBSD Stable Mailing List <freebsd-stable@freebsd.org> Subject: Re: What is /boot/kernel/*.symbols? Message-ID: <4A4E1E24.3020303@andric.com> In-Reply-To: <20090703144121.GC11039@hugo10.ka.punkt.de> References: <20090703142528.GA11039@hugo10.ka.punkt.de> <4A4E174A.1050207@andric.com> <20090703144121.GC11039@hugo10.ka.punkt.de>
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On 2009-07-03 16:41, Patrick M. Hausen wrote:
> But I thought, they were in the kernel itself?
>
> %file /boot/kernel/kernel
> /boot/kernel/kernel: ELF 64-bit LSB executable, x86-64, version 1 (FreeBSD), dynamically linked (uses shared libs), not stripped
>
> "not stripped" - i.e. "with debug symbols". Wrong? Since when?
Well, only the debug symbols have been stripped, not any others. If you
look in /usr/src/sys/conf/kern.post.mk, you will see this fragment:
${KERNEL_KO}: ${FULLKERNEL} ${KERNEL_KO}.symbols
${OBJCOPY} --strip-debug --add-gnu-debuglink=${KERNEL_KO}.symbols\
${FULLKERNEL} ${.TARGET}
${KERNEL_KO}.symbols: ${FULLKERNEL}
${OBJCOPY} --only-keep-debug ${FULLKERNEL} ${.TARGET}
E.g. the debug stuff is put into the .symbols files. The kernel itself
still contains the function and data names, though:
$ objdump -t /boot/kernel/kernel
/boot/kernel/kernel: file format elf32-i386-freebsd
SYMBOL TABLE:
c092de00 l .data 00000000 tmpstk
c092de58 l .data 00000000 physfree
c092de64 l .data 00000000 proc0uarea
[...]
If you want to build absolutely without any symbols whatsover, remove
the "makeoptions DEBUG=-g" line from your kernel config file.
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