RE: how to use already existing .d files

[Swapna Pawar]

Hi,

>>Without a complete and reproducible example, I don't see how you can be 
>>helped by others then.
We have attached one example with makefiles along with the sample .c file and 
.h files.

Password for the attached zip is: 123

There are two makefiles in the zip,
 - one with the dependency rule (filename - makefile1)
 - the other one without the dependency rule (filename - makefile2)

We have added two includes in the source file
- one within the same directory structure where 'makefile' file exists
 - the other one outside the directory structure. (please change the include 
path in the source file as well as in the makefiles as per your directory 
structure)

Keep the 'inside.h' header file in the same directory structure where 
'makefile' file exists.
and the 'outside.h' header file need to be placed anywhere else (same as 
mentioned in the source file) other than the makefile directory.

Step 1:
                - Rename 'makefile1' to 'makefile'
            - Run the first makefile(i.e.makefile1) using 'make all' command
                - First, it will generate .o and .d files

Step 2:
                - Rename 'makefile2' to 'makefile'
            - Run the second makefile (i.e. makefile2) using 'make all' command
                - this time, it will not generate the dependency (.d) files
                - Now modify any header file (i.e. inside.h, outside.h)
                - Then run 'make all' command
                - Here, no file is re-built even after the .h files are modified

Regards,
Swapna

-----Original Message-----
From: Philip Guenther [mailto:address@hidden
Sent: 06 December 2013 AM 11:49
To: Swapna Pawar
Cc: address@hidden
Subject: Re: how to use already existing .d files

On Thu, Dec 5, 2013 at 9:25 PM, Swapna Pawar <address@hidden> wrote:
> Thank you for the quick response.
>
> We have already tried this by adding the following rule:
>
> %.o: %.c
>             gcc -c -x c -o "$@" $<"
>
> Modifying the rule as above does not use the existing .d files and does not 
> rebuild the .c file in case any required header is modified.
> In addition to the above rule, we also tried using '-include $(C_DEPS), not 
> no luck..

Without a complete and reproducible example, I don't see how you can be helped 
by others then.


Philip Guenther
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Makefile_Example.zip
Description: Makefile_Example.zip