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hi

im really desperate here, i dont understand make, really
have a look at this:
Let me explain what this is *supposed* to do:

When boot.bin is made, the following things should occur (in this order):

1) Execute "ld main.o video.o utilities.o -e start -N -M > boot.mem -o boot.bin --oformat binary -T script"
2) Set BOOT_SIZE to contain the size of the newly created file "boot.bin" in bytes
3) Append zeroes to the end of "boot.bin" until the size (in bytes) of "boot.bin" is a multiple of 512.

When 512.bin is made, the following should occur (in this order):

1) "make boot.bin"
2) Make 512.bin via execution of "nasm -f bin 512.asm -o 512.bin" passing BOOT_SIZE to the compiler as an environment variable. This time, however, I want to refer to BOOT_SIZE as the NEW size of boot.bin (i.e. the multiple of 512).

When will I get this done? Any ideas?

Thanks

Martin

The power of Stallman compels you!

Maybe you could try getting rid of the extra .bin at the end of this line Also you need to tell the makefile how to compile the .o files. You could add something like this You would need to add the other .o files and the compiler options but that should work. Theres a better way to do that but I am posting at 1:46 in the morning.

One more thing, every line that is supposed to be executed eg. ld <something>, gcc <something> has to be started with a tab. Not 4 or 8 space characters, it has to be an actual tab character.

frank wrote: Also you need to tell the makefile how to compile the .o files. You could add something like this

Code: Select all

main.o : main.c
    gcc main.c -o main.o

You would need to add the other .o files and the compiler options but that should work.

Actually, my post was only a snippet showing where the problem lies (variables). Of course I had told make how to compile the .o files and this...

frank wrote:One more thing, every line that is supposed to be executed eg. ld <something>, gcc <something> has to be started with a tab. Not 4 or 8 space characters, it has to be an actual tab character.

Yes I know. I've got the solution now from someone on the make forum. My problem was with assigning the size in bytes of a file to a variable that doesnt even exist before running tha makefile so what you have to do is play around with $ and $$ and then it works (I haven't really understood it myself)...Cheers

Martin

Without digging through it, two thoughts:

- makefile variables and shell variables are two different things; don't use BOOT_SIZE for an environment variable and a makefile variable at once.

- use := to assign a value once (at script start); use = to assign a value evaluated at every occurrence of the variable name.