make problem

irfanhab · 06-29-2005, 05:43 AM

Hi,

I'm working on a Qt program, now when I make a change to the source file, I 'make' the program and check the changes.

But now suddenly, even if I change the source file, and go 'make' in the shell it says:

Code:

make:nothing to be done for 'first'

I even recreated the make file, by going qmake and all, but still I cannot recompile the program!
Any clues??

Mara · 06-29-2005, 03:04 PM

Makefile from qmake should have 'make clean' option that removed all .o etc files. Then try to run make again. If it doesn't help check your time settings. See if your time is correct and if edit time of the modified files is correct.

irfanhab · 06-29-2005, 07:01 PM

well if I do make clean, it will undo all the changes i have made to the autogenerated files

How does make know when to compile and when not to?

Mara · 06-30-2005, 03:36 PM

Make checks timestamps on source files and .o ones. So if you don't want to run the autogen script again (what may be hard if you add new files) edit them, then make should consider them as modified and compile.

bigearsbilly · 07-01-2005, 05:00 AM

it would help if you posted the make file

puffinman · 07-01-2005, 12:38 PM

If you want to make to think the files have changed without actually opening them up in an editor and messing with them, just use touch. It will change the modification time to the current time. So if it's a bunch of c files,

Code:

touch *.c

should then cause make to recompile everything.