gcc compiler is not compiling old C Programming files beacuse of timestamp issue
 

Hi,
I am using makefile to complile all C Programming files. But certain files are not getting compiled and hence its object file is not getting generated. This is happening due to files haven't been modified for a long time. It seems that compiler knows that its object file is there hence no need to complie it actually it is not.

Please suggest how to overcome the issue.

Have you tried this?jdk

yes. I always do this before compiling any make file.

Tried this too ?

Also, you can try running this in all subdirectories where .o files are:

Just don't put a space between "*" and ".o"!!!

How is that an issue? That's the whole point (well, at least
a major part of it) of "make" - you only compile what needs
to be compiled rather than the whole source tree...

He says that no object file is being generated!

Thanks for the suggestions. Yes, my makefile is compiling only some files. Now I have updated the makefile to the current date and it is working fine. This problem comes sometimes only. But I want to know the reason why it happens if file becomes too old and has no modification in it.

Hi -

Just to clarify what's already been said:
Yes. Exactly. That's one of the main BENEFITS of using "make", is that it DOESN'T recompile the world - it only does what's necessary. And, in this case, it looks like "make" believed (probably correctly!) that it didn't NEED to recompile most of your object files. That's a Good Thing :)

Simple: if your source file is NEWER than the object (or, more precisely, if the "target" is older than its "dependency") then no action is needed.
It's a standard convention to have a "clean" target in any makefile, so you can FORCE recompilation if you wish to.

This is what "make clean" typically does.

Thanks very much. Got it.

Even after doing rm -f *.o and make clean, I am facing same issue. Object file is not getting generated.

It it showing some errors ? Paste here the output in code tags: http://www.linuxquestions.org/questi...do=bbcode#code

I have got the issue fixed. Thanks for the support and help.

It would be better if you would let others know the solution too.

Actually some other file was also generating the exe file of same name where my source file is present. Hence it was no getting compiled as it sees an exe file already created. I deleted that exe file and now it was working successfully.

Once again thanks for the help and support you all provided to me. I came to know lot many new things.