Hi all, I am poring gcc 4.3.2 for a micro-controller and use it to compile C source code. I found that gcc is very sensitive to small changes in C source code even if the change doesn't affect any function of the source code. For example, a source file foo.c includes a header file foo.h. If one macro definition is added to foo.h and the macro is not used in foo.c. The assembly file foo.s is still changed and a few instructions swapped positions . I checked foo.c.129t.final_cleanup and found difference in it.
I am wondering what caused the change in foo.o. Is there any randomization in gcc? How can I make the assembly file foo.s same no matter foo.h is changed or not? Thanks -Qifei Fan
