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    SubjectRe: Makefile gcc -o /dev/null: the dissapearing of /dev/null
    On Sat, 29 Sep 2001, Jan-Benedict Glaw wrote:

    > On Sat, 2001-09-29 06:10:52 -0700, Jim Treadway <>
    > wrote in message <>:
    > >
    > > So then you can no longer 'make modules && make modules_install', or you
    > > have to cp or chown /usr/src/linux on a fresh install to compile your
    > > kernel? Doesn't sound pleasant to me.
    > You may do it this way:
    > make dep clean bzImage modules && su -c "make modules_install"
    > This is so far the minimal version for building as non-root user.


    a) It doesn't work (yeah, I'm sure there are many, many, many other
    work-arounds, but I can't believe I'm the only one compiling as root):

    $ cd /usr/src/linux
    $ make dep clean bzImage modules && su -c "make modules_install"
    make[1]: Entering directory `/usr/src/linux/arch/i386/boot'
    make[1]: Nothing to be done for `dep'.
    make[1]: Leaving directory `/usr/src/linux/arch/i386/boot'
    scripts/mkdep init/*.c > .depend
    /bin/sh: .depend: Permission denied
    make: *** [dep-files] Error 1

    b) You are still evaluting most, if not all, of the lines in the Makefiles
    that do "gcc -o /dev/null", as root.

    > > I think the "trick" is to redirect stdout and stderr to /dev/null as well,
    > > so that /dev/null doesn't get removed from the file system since it is
    > > held open by the shell.
    > >
    > > Something like:
    > >
    > > gcc -o /dev/null -xc /dev/null /dev/null 2>&1
    > No-go. It's perfectly okay to remove an opened file. Test it yourself.
    > You may even replace a running (!) executable...

    Which is exactly why I suggested keeping it open via I/O redirection
    (except see below).

    > > Perhaps someone just forgot the I/O redirection in one of the tests?
    > No. It would be of no effect:-)

    You are right here though...the I/O redirection doesn't have anything to
    do with it, assuming you pass the -S flag to gcc, which I neglected, and
    insert the missing '>' in my example above (oops).

    But... this seems to be moot since in my case however /dev/null stays
    around even when compiling as root. ;)

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