[Xen-devel] Bizarre compile/link problem from minor change

["Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>]

Perhaps someone who is smarter (or at least has more
compiler/linker knowledge than me :-) can solve this
bizarre problem:

I have been annoyed for some time with a hack that's
in xen/common/string.c... For the routine memcpy(),
there is an #undef right before it.  Why not do
this properly and use the #ifndef __HAVE_ARCH_MEMCPY
around it, like all the other routines?  So I tried
it.  And got an undefined reference reported by the
linker from arch/x86/vmx.o.

Looking at arch/x86/vmx.c, there's no reference to
memcpy.  And if you look at the output from cpp, there's
no reference to memcpy.  If you add a #include
for <xen/string.h> after <xen/lib.h>, it doesn't
fix anything.

To try to force the compiler to tell me where the
problem lay, AHA, I added a line at the beginning
of the source:

void memcpy(void) {}

thinking that the compiler would surely report a
mismatch.  It didn't and the compile/link succeeds!

Clearly adding this line is not a nice solution.
Can anyone come up with a better one?   (Other than
just leaving string.c as is...)  Please try your
solution yourself... I tried a few and couldn't find
one that worked.  If you find one, kindly reply to
this post.

Maybe I'm just tired....

Dan


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