Error when tuning the toolchain

Simone Dalmasso simone.dalmasso at
Mon Oct 26 09:00:23 PDT 2009

Ok, thank you. I've rebuilt all but at the same point when I type:
gcc -dumpspecs | sed 's@^/lib/' \
> `dirname $(gcc -print-libgcc-file-name)`/specs

I get no such file or directoy. If I create an empty file called 'specs' it
doesn't raises errors yet but the specs file remains empty and the ne next

GCC_INCLUDEDIR=`dirname $(gcc -print-libgcc-file-name)`/include &&
find ${GCC_INCLUDEDIR}/* -maxdepth 0 -xtype d -exec rm -rvf '{}' \; &&
rm -vf `grep -l "DO NOT EDIT THIS FILE" ${GCC_INCLUDEDIR}/*` &&

gcc: unrecognized option '-mtune=pentiumpro'
and a list of removed...

Testing the cc with the dummy. c file I don't get nothing, the prompt
remains blinking and I nedd to interrupt it.
I followed exactly the book...


2009/10/26 Chris Staub <chris at>

> On 10/26/2009 09:43 AM, Simone Dalmasso wrote:
> > Hi list. I'm using the lfs live cd on an empty virtual machine. I'm
> > following the lfs book but I get an error when I try to adjust the
> > toolchain in the chapter 5.7.
> > The error is:
> > sudo gcc -dumpspecs | sed 's@^/lib/' \
> >  > `dirname $(gcc -print-libgcc-file-name)`/specs
> > password: gcc unrecognized option "-mtune=pentiumpro"
> > sed: can't read (dirname
> > /tools/lib/gcc/i686-pc-linux-gnu/4.1.2/libgcc.a): no such file or
> directory
> > sed: can't read /specs: No such file or directory
> >
> The book's instructions do not say to use "sudo". All of Chapter 5 must
> be done entirely as the LFS user. If you have been using root/sudo at
> any point after starting Chapter 5, you will need to rm -rf /tools/* and
> go back to the beginning. If there is some part of the instructions that
> don't work without sudo, it means you've missed something.
> --
> FAQ:
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