Ultimately, make is just a tool for invoking commands -- specifically
shell commands. So just break each of those steps down into a shell
script or shell fragment that does what you want. Remember that if you
want to do more than one thing in a shell fragment, you need to specify
it as one line to make using continuation-\ since otherwise make invokes
each command in a new shell process. And secondly remember that if you
want to reference a $var in the shell fragment you need to use $$ so
that it's not interpreted as a make variable.
Something like this (untested):
.SUFFIXES: .asm .o .bin
.PHONY: all
all: binarydisk.bin
%.bin: %.asm
$(AS) $< -o $@
foo1.bin: foo1.asm
foo2.bin: foo2.asm foo1.bin
$(AS) -DFOO=`stat -c %s $(word 2,$^)` $< -o $@
# or:
# env FOO=`stat -c %s $(word 2,$^)` $(AS) $< -o $@
sectorsize := 512
binarydisk.bin: foo1.bin foo2.bin
len=`stat -c %s $(word 1,$^)`; \
start=`expr $$len / $(sectorsize)`; \
if [ `expr $$len % $(sectorsize)` != 0 ]; then \
start=`expr $$start + 1`; \
fi; \
dd if=$(word 1,$^) of=$@ bs=$(sectorsize) && \
dd if=$(word 2,$^) of=$@ bs=$(sectorsize) seek=$$start
Brian
I tried with your hints but it still doesnt work...I was trying to
follow your example (leaving out all the cryptic stuff), this is how far
I've got:
SECTOR_SIZE=512
all:
make bootdisk.bin
bootdisk.bin: 512.bin
-rm bootdisk.bin
touch bootdisk.bin
dd if=512.bin of=bootdisk.bin count=1 seek=0
dd if=gdt.bin of=bootdisk.bin count=1 seek=1 #"actually", count
should be (GDT_SIZE)/(SECTOR_SIZE), GDT_SIZE is guaranteed to be a
multiple of 512
512.bin: 512.asm gdt.bin
-rm 512.bin
nasm -f bin 512.asm -o 512.bin -DGDT_SIZE=`stat -c %s gdt.bin`
-DSECTOR_SIZE=512 #env variables GDT_SIZE and SECTOR_SIZE are both
referenced from within 512.asm
gdt.bin: gdt.asm
-rm gdt.bin
nasm -f bin gdt.asm -o gdt.bin
This doesnt work (and you can probably see why). Can you please make the
necessary corrections (as few as possible) and make it not too cryptic,
so I can understand what is going on...or, if necessary, explain it a
little bit...I've tried the make manual, really, but I get confused :-(
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