"mygcc/libexec/gcc/i686-pc-linux-gnu/4.0.2/cc1" != "mygcc/gcc/cc1"

[sean yang]

I added a pass in GCC and successfully built it to binary following the 
building procedure (./configure, make, make install). I found 
"mygcc/libexec/gcc/i686-pc-linux-gnu/4.0.2/cc1"  is different from 
"mygcc/gcc/cc1", as shown below.
----------------------------------------------------------------------
mygcc>ls -l libexec/gcc/i686-pc-linux-gnu/4.0.2/cc1
-rwxr-xr-x    1 user   other    10985929 May 12 22:12 
libexec/gcc/i686-pc-linux-gnu/4.0.2/cc1
mygcc>ls -l gcc/cc1
-rwxr-xr-x    1 user   other    10986625 May 12 22:17 gcc/cc1
--------------------------------------------------------------------------

When I compiled a test code i.e, ">mygcc/gcc/cc1 $HOME/test.c", everything 
works fine as I expected--i.e., the modification of the pass itself is good.

But when I tested the same code with the compiler driver (gcc), i.e., 
">mygcc/bin/gcc $HOME/test.c", as the driver uses 
mygcc/libexec/gcc/i686-pc-linux-gnu/4.0.2/cc1 as the compiler, it does not 
behave as I wanted (i.e, the pass I added is not executed). I wonder what 
caused the problem, and how I can fix it.

Thanks a lot,
Sean

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