New .S file did not get compiled, please help

[wuxi <wu dot andrew dot xi at gmail dot com>]

Hi,

I am working on ia64 and glibc-2.5. My goal is to do whole program 
instrumentation to enable taint tracking.

For that purpose, I need a specific memcpy which is built for taint 
tracking, so I did the following modifications to glibc (actually very 
trivial modifications):

in string/memcpy.c, I rewrite the memcpy to call shift_memcpy (which is 
the real memory copy routine) twice, one to write the bitmap for taint 
tracking, one for the real memory copy. The skeleton of the code is 
shown below:

=====================================================

void *
memcpy (dstpp, srcpp, len)
    void *dstpp;
    const void *srcpp;
    size_t len;
{
   ...
   shift_memcpy (dst, src, len);    /* write the bitmap */
   shift_memcpy (dst', src', len');  /* real memory copy */
   ...
}

======================================================

For performance reason, the shift_memcpy is implemented through reusing 
the memcpy.S (sysdeps/ia64/memcpy.S) to shift-memcpy.S and modify the 
definition of memcpy to shift_memcpy (That is, change entry(memcpy) to 
entry(shift_memcpy), and so on). I have also added shift_memcpy to 
Versions under "sysdeps/ia64".

However, when I get the modified glibc to build, it cannot find 
shift_memcpy, and I traced the problem, found that shift_memcpy.S did 
not get compiled... (that is, no shift_memcpy.o, shift_memcpy.os generated).

the full error is shown below:

=======================================================

/home/wuxi/shift/install/compiler-4.1.1/bin/gcc   -nostdlib 
-nostartfiles -shared       \
 -Wl,-z,combreloc -Wl,-z,defs -Wl,--verbose 2>&1 |     \
         LC_ALL=C \
         sed -e '/^=========/,/^=========/!d;/^=========/d'    \
             -e 's/\. = 0 + SIZEOF_HEADERS;/& _begin = . - 
SIZEOF_HEADERS;/' \
         > /home/wuxi/shift/build/glibc2.5/elf/ld.so.lds
/home/wuxi/shift/install/compiler-4.1.1/bin/gcc   -nostdlib 
-nostartfiles -shared -o 
/home/wuxi/shift/build/glibc2.5/elf/ld.so                   \
         -Wl,-z,combreloc -Wl,-z,defs  \
         /home/wuxi/shift/build/glibc2.5/elf/librtld.os 
-Wl,--version-script=/home/wuxi/shift/build/glibc2.5/ld.map             \
         -Wl,-soname=ld-linux-ia64.so.2 -T 
/home/wuxi/shift/build/glibc2.5/elf/ld.so.lds
/home/wuxi/shift/build/glibc2.5/elf/librtld.os: In function `memcpy':
/home/wuxi/shift/src/glibc2.5/string/memcpy.c:52: undefined reference to 
`shift_memcpy'
/home/wuxi/shift/src/glibc2.5/string/memcpy.c:59: undefined reference to 
`shift_memcpy'
collect2: ld returned 1 exit status
make[2]: *** [/home/wuxi/shift/build/glibc2.5/elf/ld.so] Error 1
make[2]: Leaving directory `/home/wuxi/shift/src/glibc2.5/elf'
make[1]: *** [elf/subdir_lib] Error 2
make[1]: Leaving directory `/home/wuxi/shift/src/glibc2.5'
make: *** [all] Error 2

=======================================================

So, what did I miss here? Any help is truly appreciated. Thanks

yours sincerely

Andrew.