>> On Sun, Dec 8, 2019 at 2:06 PM Frank A. Cancio Bello <frank@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>> Hi,
>> I know that with gcc -E you can get the output of the preprocessor, but what I have to do to get that output for every source code file in the Linux Lernel as part of the compilation process?
>>
>> thanks
>> frank a.
Hi Frank,
There are two options you can use with gcc to get the processor output as part of the kernel compilation process.
-save-temps
-save-temps=<arg>
-save-temps=<arg>
1 - Open the top level Makefile in your favorite text editor.
2 - Search for KBUILD_CFLAGS
My Makefile which is at /home/aruna/linux-5.4.2/Makefile shows me at line 458
KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs
3 - Now plugin -save-temps=<arg> but replace <arg> with obj like shown below:
KBUILD_CFLAGS := -Wall -save-temps=obj -Wundef -Werror=strict-prototypes -Wno-trigraphs
4 - Save the Makefile.
5 - Run make and we are done !
Each directory will have the preprocessor output in *.i and *.s files.
Good luck - Aruna ( I keep asking myself 'why' are you doing this though ? :)
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