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    SubjectRe: 2.6.8-rc2-mm1: NTFS compile error with gcc 2.95
    On Thu, 2004-07-29 16:41:49 +0200, Adrian Bunk <bunk@fs.tum.de>
    wrote in message <20040729144149.GC2349@fs.tum.de>:
    > On Wed, Jul 28, 2004 at 02:04:44AM -0700, Andrew Morton wrote:
    > >...
    > > Changes since 2.6.8-rc1-mm1:
    > >...
    > > bk-ntfs.patch
    > >...
    >
    > This causes the following compile error when using gcc 2.95:
    >
    > <-- snip -->
    >
    > ...
    > LD .tmp_vmlinux1
    > fs/built-in.o(.text+0x14425f): In function `ntfs_find_vcn':
    > : undefined reference to `__cmpdi2'
    > fs/built-in.o(.text+0x144272): In function `ntfs_find_vcn':
    > : undefined reference to `__cmpdi2'
    > make: *** [.tmp_vmlinux1] Error 1
    >
    > <-- snip -->

    GCC wanted to make a compare on a 8byte integer (so probably long long),
    but decided there isn't an appropriate insn on that hardware platform.
    So instead of emitting assembler, it generated a function call that
    would have resulted in a call to libgcc. However, the Linux kernel asks
    to *not* link that lib (eg. think about a gcc compiled for i686 (so is
    libgcc) while compiling for i386).

    With the that constraint in mind, there isn't really a "nice" solution.
    Maybe Linux should provide a function of that name (and several others,
    too). OTOH, the H8/300 port explicitely links in libgcc, but that's only
    an option if even the oldest processor supports *all* known CPU
    instructions.

    MfG, JBG

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