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Subject: Re: using memset in a module
From: Shaya Potter <spotter@cs.columbia.edu>
To: "Randy.Dunlap" <rddunlap@osdl.org>
Cc: linux-kernel@vger.kernel.org
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On Thu, 2002-09-26 at 18:51, Randy.Dunlap wrote:
> On 26 Sep 2002, Shaya Potter wrote:
> 
> | I have a problem using memset in a module.
> |
> | I've tried including <linux/string.h> or <asm/string.h> but whenever I
> | compile with gcc 2.95, the resulting object has memset being an
> | undefined symbol.  When I compile with gcc-3.2 it works right as is
> | inline in the code and there's no symbol.
> |
> | has anyone seen this b4?  Is this a gcc bug? a kernel header bug? a bug
> | in my coding (i.e. does one have to do anything else besides include
> | <linux or asm/string.h> or have special gcc cmd line options that are
> | different from whats normally needed for a module).
> |
> | if it matters, I'm using the debian gcc's
> |
> | spotter@zaphod:~/cvs/zap/virtualization$ gcc -v
> | Reading specs from /usr/lib/gcc-lib/i386-linux/2.95.4/specs
> | gcc version 2.95.4 20011002 (Debian prerelease)
> |
> | and (cutting the cruft)
> | gcc version 3.2.1 20020924 (Debian prerelease)
> 
> What gcc options are you using?
> You need -O2 at least.
>           ^ upper-case letter O


yes, using it.

gcc -Wall -DMODULE -DMODVERSIONS -D__KERNEL__ -DLINUX -DEXPORT_SYMTAB
-I/usr/src/linux/include/ -I`pwd`/../migration
-I`pwd`/..//virtualization -O2 -fomit-frame-pointer -pipe
-fno-strength-reduce -malign-loops=2 -malign-jumps=2 -malign-functions=2
-o fs1.o -c virtualizers/fs1.c