Which file is changed after I do "make menuconfig"?

In linux, I thought that the file Makefile is changed after I run make menuconfig.

But when I diff Makefile, I don't see any difference.

Which file is changed after I do make menuconfig?

Solution 1:

In general, after a make menuconfig or make config, the .config file is changed. This file describes which options are choosen and will tell make and Makefile which file to compile and which options to activate.

As said by @Lekensteyn, the previous config file will be renamed in .config.old

Solution 2:

In general, you may use

find /usr/src/linux -mmin -10

to find files, modified in the last 10 Minutes yourself in said directory. This would lead to the result Cédric Julien gave: .config.