Need help in debugging the unbuilt compiler

[Vaibhav Shrimali]

I have made some changes in the source code of the compiler. But,
while building the compiler, it shows an error saying "conftest.c:
cannot compute suffix for object files".
To understand where I am wrong I have installed debugging tools like
"Valgrind" and "ddd". But when I try to debug the conftest.c file I
find that the compiler deletes the conftest.* files when it gets an
error.
Without the object file how can I debug it.
If anyone have worked on debugging the compiler before please help me.
If there is any other way of debugging please tell me, or if I am
wrongly doing the task please correct me.

-- 
Vaibhav Shrimali
BTech(ICT), DA-IICT
Gandhinagar